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PVCS

Premature ventricular contractions (PVCs) are extra heartbeats that originate in the ventricles—the lower chambers of the heart—rather than the atria, interrupting the normal cardiac rhythm.^[1]^[2] These ectopic beats occur when an electrical impulse prematurely triggers a ventricular contraction, often resulting in a brief pause before the next regular heartbeat.^[1]^[2] PVCs are highly prevalent, affecting up to 75% of the general population at some point on ambulatory monitoring, and are typically benign in healthy individuals without underlying heart disease.^[2] While many people experience no symptoms, PVCs can sometimes cause sensations of fluttering or skipped beats, particularly if frequent or associated with heart conditions. In those with structural heart disease, they may indicate or contribute to more serious arrhythmias. Management ranges from lifestyle modifications to medications or ablation, depending on symptoms and underlying causes, with a generally favorable prognosis in healthy individuals.^[1]^[2]

Definition and characteristics

Definition

Premature ventricular contractions (PVCs), also known as premature ventricular complexes or ventricular premature beats (VPBs), are ectopic heartbeats that originate within the ventricles, typically from Purkinje fibers or ventricular myocytes, rather than the sinoatrial node.^[3]^[4]^[5] These extra beats disrupt the normal cardiac rhythm by occurring earlier than the next expected sinus beat, resulting in a premature depolarization of the ventricles that bypasses the usual conduction pathway through the atria.^[3] PVCs are classified as a form of ventricular extrasystole, representing abnormal electrical impulses arising distal to the His-Purkinje system.^[4]^[6] In contrast to premature atrial contractions (PACs), which arise from ectopic foci in the atria and conduct through the atrioventricular node to the ventricles, PVCs initiate directly in the ventricular myocardium or Purkinje network, often producing a wider QRS complex on electrocardiography due to altered ventricular activation.^[7]^[8] This distinction is fundamental, as PACs primarily affect supraventricular structures, whereas PVCs involve subatrial origins and can more readily lead to hemodynamic effects if frequent.^[9] PVCs are commonly benign in individuals without underlying heart disease, occurring sporadically without clinical significance, but frequent PVCs—defined as more than 10-20% of total beats—may signal potential structural or ischemic cardiac issues requiring further evaluation.^[3]^[6]^[10] Historically, the terminology has evolved from ventricular premature beats to the more precise premature ventricular complexes, reflecting their role as isolated ectopic events rather than full contractions in some contexts.^[5]^[11]

Electrocardiographic features

Premature ventricular contractions (PVCs) are identified on the electrocardiogram (ECG) by a premature QRS complex that is typically wide and morphologically distinct from the sinus rhythm QRS. The QRS duration is usually greater than 120 ms, often exhibiting a bizarre, notched, or slurred appearance due to ventricular origin without conduction through the His-Purkinje system.^[12] Unlike supraventricular premature beats, PVCs are not preceded by a P wave, although a retrograde P wave may occasionally appear after the QRS, inverted in leads II, III, and aVF.^[12]^[13] A hallmark of isolated PVCs is the compensatory pause that follows, where the interval from the sinus beat before the PVC to the sinus beat after equals twice the normal sinus RR interval, resulting from the PVC's failure to reset the sinus node due to retrograde concealment in the atrioventricular node.^[12] This full pause contrasts with noncompensatory pauses seen in other arrhythmias, such as premature atrial contractions.^[13] PVCs often show discordant ST-segment and T-wave changes, with the ST-T complex directed opposite to the main QRS deflection, reflecting abnormal repolarization secondary to the altered activation sequence.^[12] These repolarization abnormalities are prominent and help distinguish PVCs from aberrant supraventricular beats.^[13] The morphology of the PVC QRS provides clues to its ventricular origin: a left bundle branch block (LBBB)-like pattern, with a predominantly negative QRS in lead V1, suggests a right ventricular site, such as the right ventricular outflow tract; conversely, a right bundle branch block (RBBB)-like pattern, with a positive QRS in V1, indicates a left ventricular origin.^[12]^[13] Multifocal PVCs display varying morphologies from different foci.^[12] Fusion beats occur when a PVC partially coincides with a sinus beat, producing a hybrid QRS morphology intermediate between the sinus and PVC patterns, due to simultaneous activation from both sources.^[13] Interpolated PVCs, less common, appear between two sinus beats without a compensatory pause, as the sinus impulse conducts through the atrioventricular node despite the PVC, potentially increasing cardiomyopathy risk with high burden.^[13]

Signs and symptoms

Typical manifestations

The most common symptom of premature ventricular contractions (PVCs) is palpitations, often described as a sensation of skipped beats, pounding, fluttering, or jumping in the chest.^[1]^[14] These sensations arise from the abrupt early contraction of the ventricles, which interrupts the normal heart rhythm and increases awareness of cardiac activity.^[3] Many individuals with PVCs experience no symptoms at all, with studies using 24- to 48-hour Holter monitoring detecting asymptomatic PVCs in approximately 50% to 75% of healthy people who have them on evaluation.^[15] This high rate of unawareness underscores that PVCs are often incidental findings rather than clinically disruptive events in otherwise healthy individuals. Lightheadedness or dizziness can occur due to brief hemodynamic instability caused by the irregular rhythm, particularly when PVCs reduce cardiac output momentarily.^[3]^[16] Fatigue or reduced exercise tolerance may also develop in cases involving higher PVC frequency, as the irregular beats impair overall cardiac efficiency during physical activity.^[3]^[17] The likelihood and intensity of symptoms often correlate with PVC frequency; isolated PVCs are frequently unnoticed, whereas patterns like bigeminy—where every other beat is a PVC—tend to be more perceptible and bothersome due to their repetitive nature.^[13]^[3] Common benign triggers such as caffeine consumption can heighten symptom awareness in susceptible individuals.^[1]

Associated conditions

Certain symptoms accompanying premature ventricular contractions (PVCs) can indicate underlying structural heart disease and warrant prompt evaluation. Syncope or near-syncope, particularly when occurring during physical exertion, serves as a critical warning sign, as it may reflect impaired cardiac output due to structural abnormalities such as cardiomyopathy or valvular disease.^[18]^[2] In such cases, these episodes suggest that PVCs are not isolated but part of a broader arrhythmogenic substrate that compromises hemodynamic stability.^[17] Chest pain associated with PVCs often presents in an angina-like manner and points to myocardial ischemia as a potential etiology, where reduced coronary perfusion exacerbates the ectopic beats.^[18] This symptom typically involves pressure or discomfort in the chest, neck, or arms, distinguishing it from benign sensations and necessitating assessment for coronary artery disease.^[2] Shortness of breath (dyspnea) in the presence of PVCs frequently signals coexisting heart failure, where frequent ectopic activity impairs ventricular filling and ejection, leading to pulmonary congestion.^[19] Alternatively, it may relate to pulmonary conditions that heighten arrhythmic susceptibility, such as chronic obstructive pulmonary disease, though cardiac origins predominate in symptomatic cases.^[2] Exertional symptoms, including worsening palpitations or fatigue during physical activity, heighten concern for underlying cardiomyopathy, as exercise unmasks latent myocardial dysfunction triggered by PVCs.^[20] These manifestations prompt comprehensive imaging and stress testing to identify conditions like arrhythmogenic right ventricular cardiomyopathy, where PVC burden correlates with progressive ventricular remodeling.^[18] Additional red flags include PVCs in individuals with a family history of sudden cardiac death or known channelopathies, such as long QT syndrome, which elevate the risk of life-threatening arrhythmias beyond isolated ectopy.^[21] These familial associations necessitate genetic counseling and targeted screening to mitigate hereditary risks.^[22]

Causes and risk factors

Benign triggers

Premature ventricular contractions (PVCs) in otherwise healthy individuals can often be provoked by reversible, non-pathological factors that transiently alter cardiac electrophysiology or autonomic balance. These benign triggers are common and typically do not indicate underlying heart disease, though they may increase PVC frequency in susceptible people. Identifying and mitigating such triggers forms the basis of initial management strategies.^[13] Lifestyle factors such as excessive caffeine intake, alcohol consumption, tobacco use, and illicit drug use are well-established precipitants of PVCs. Caffeine, found in coffee, tea, and energy drinks, stimulates the sympathetic nervous system, potentially increasing adrenergic tone and PVC occurrence. Similarly, alcohol can disrupt cardiac ion channels and autonomic regulation, while nicotine from tobacco elevates catecholamine levels, and illicit drugs like cocaine or amphetamines provoke PVCs through intense sympathetic stimulation.^[1]^[14]^[2] Emotional states including stress, anxiety, and sleep deprivation also contribute by elevating circulating catecholamines, which enhance myocardial automaticity. Acute stress or anxiety activates the sympathetic response, mimicking exercise-induced changes and provoking ectopic beats. Sleep deprivation similarly disrupts autonomic homeostasis, increasing PVC burden through sustained adrenergic surges.^[23]^[3]^[14] Physiological triggers encompass certain activities or bodily states that modulate vagal or sympathetic tone. In some healthy individuals, exercise—particularly during recovery phases—can elicit PVCs due to shifting autonomic balance and residual catecholamine effects. Post-meal vagal stimulation from gastric distension may also induce PVCs via enhanced parasympathetic activity, while positional changes, such as assuming a supine position, can alter venous return and trigger ectopics through autonomic shifts.^[13]^[24]^[2] Certain medications can provoke PVCs by stimulating the cardiovascular system. Decongestants containing pseudoephedrine increase sympathetic activity, raising heart rate and ectopic potential. Beta-agonist asthma inhalers, like albuterol, similarly cause transient tachycardia and PVCs through adrenergic stimulation. Some antidepressants, particularly tricyclics, may contribute via anticholinergic or noradrenergic effects.^[25]^[3]^[26] Transient electrolyte imbalances, such as mild hypokalemia or hypomagnesemia arising from dietary deficiencies, dehydration, or gastrointestinal losses, can lower the threshold for ventricular ectopy. Low potassium disrupts repolarization, while magnesium deficiency impairs ion channel function, both fostering PVCs in the absence of severe pathology. Correcting these through dietary adjustments or supplementation often reduces episodes.^[2]^[27]^[3] Eliminating or reducing exposure to these benign triggers is a first-line conservative approach to managing PVCs in healthy individuals.^[13]

Underlying cardiac conditions

Premature ventricular contractions (PVCs) are frequently associated with underlying structural heart diseases that predispose to ectopic ventricular activity by altering myocardial substrate or conduction pathways. Ischemic heart disease, particularly following myocardial infarction, increases PVC occurrence due to scar tissue facilitating re-entrant circuits.^[3] Cardiomyopathies, including dilated and hypertrophic forms, disrupt normal ventricular depolarization and are common substrates for PVCs, with frequent ectopy potentially exacerbating left ventricular dysfunction.^[3] Valvular heart diseases, such as mitral valve prolapse, can trigger PVCs through mechanical stretch or associated fibrosis affecting the papillary muscles.^[3] Congenital heart defects, including those leading to dilated cardiomyopathy, heighten PVC risk by imposing chronic hemodynamic stress on the ventricles.^[28] Inflammatory cardiac conditions also contribute to PVC pathogenesis by causing myocardial irritation and fibrosis. Myocarditis, often resulting from viral infections or post-viral immune responses, induces inflammation that lowers the threshold for ventricular ectopy and may manifest as frequent PVCs.^[3] Electrolyte imbalances and metabolic derangements can precipitate or worsen PVCs in the context of cardiac vulnerability. Severe hypokalemia disrupts repolarization, promoting premature beats, while hyperthyroidism accelerates myocardial excitability through excess catecholamines.^[3]^[29] Hypoxia, as seen in acute ischemic or respiratory events, further sensitizes the myocardium to ectopic activity.^[3] Demographic factors influence PVC prevalence in the presence of cardiac pathology. PVCs are more common among elderly men and individuals with a history of prior myocardial infarction, reflecting cumulative structural damage and age-related fibrosis.^[3] In patients with structural heart disease, PVCs serve as markers for ventricular tachycardia substrates and are linked to increased risk of sudden cardiac death. Frequent PVCs exceeding 500 per 24 hours, particularly in ischemic or cardiomyopathic hearts, correlate with higher mortality, as evidenced by long-term cohort studies.^[3]^[30]

Pathophysiology

Ectopic mechanisms

Premature ventricular contractions (PVCs) arise from ectopic mechanisms that disrupt normal cardiac electrophysiology, primarily through enhanced automaticity, re-entrant circuits, and triggered activity. These processes involve abnormal depolarization events in ventricular myocytes or specialized conduction tissues, often exacerbated by structural or ionic alterations in the heart. While the exact mechanism can vary by clinical context, understanding these pathways is essential for distinguishing benign from malignant ectopy.^[13]^[31] Enhanced automaticity refers to abnormal spontaneous depolarization in Purkinje fibers or ventricular myocytes, where the slope of phase 4 diastolic depolarization increases, leading to premature firing. This occurs when the threshold for action potential initiation is lowered due to shifts in ion channel activity, such as enhanced inward currents during diastole. In Purkinje fibers, this mechanism is particularly prominent, as these cells possess intrinsic pacemaker properties that can become abnormally activated under pathological conditions like ischemia or fibrosis.^[15]^[31] Re-entrant circuits in PVCs typically involve unidirectional conduction block and slow conduction within ventricular tissue, creating a self-sustaining loop of electrical activity. This requires a substrate with heterogeneous refractoriness or conduction velocity, often in scarred or fibrotic areas, where a premature impulse encounters a block in one direction but propagates slowly in the other, allowing reexcitation of previously depolarized tissue. Such circuits can initiate isolated PVCs or degenerate into sustained arrhythmias if the loop persists.^[32]^[13] Triggered activity manifests as early afterdepolarizations (EADs) or delayed afterdepolarizations (DADs), driven by intracellular calcium overload that reactivates depolarizing currents during or after the action potential. EADs arise from prolonged repolarization phases, often linked to reactivation of L-type calcium channels, while DADs result from spontaneous sarcoplasmic reticulum calcium release, activating the sodium-calcium exchanger to generate transient inward currents. Calcium overload, induced by conditions like heart failure or adrenergic stimulation, lowers the threshold for these afterdepolarizations to trigger PVCs.^[13]^[33] Altered gap junction function plays a key role in facilitating ectopic foci by impairing intercellular conduction and creating isolated zones of hyperexcitability. Reduced expression or uncoupling of connexin-43 gap junctions leads to focal areas of poor electrical coupling, allowing abnormal depolarizations in small myocyte clusters to escape suppression and propagate as PVCs. This mechanism is evident in diseased hearts where heterogeneous gap junction distribution promotes source-sink mismatches, enhancing the likelihood of ectopic initiation.^[34]^[35] The autonomic nervous system, particularly sympathetic activation, influences PVC mechanisms by lowering the threshold for ectopic firing through β-adrenergic stimulation. Sympathetic surges increase cyclic AMP levels, enhancing calcium handling and automaticity in Purkinje fibers while promoting afterdepolarizations via calcium overload. This modulation can precipitate PVCs during stress or exercise, underscoring the interplay between neural input and intrinsic cardiac electrophysiology.^[36]^[37]

Common origins

The most common site of origin for premature ventricular contractions (PVCs) is the right ventricular outflow tract (RVOT), accounting for 70-80% of idiopathic cases.^[38] These PVCs typically exhibit a left bundle branch block (LBBB) morphology with an inferior axis on electrocardiography, reflecting their emergence from the subendocardial region of the RVOT.^[38] PVCs originating from the left ventricular outflow tract (LVOT) are less frequent, comprising approximately 10-20% of outflow tract-related cases.^[39] They share an inferior axis similar to RVOT PVCs but demonstrate distinct precordial transitions, often with earlier R-wave progression or a narrower QRS complex in the right precordial leads, aiding in differentiation from right-sided origins.^[38] Fascicular PVCs arise from the Purkinje system within the left ventricular fascicles, representing a smaller subset of idiopathic arrhythmias. These contractions produce a relatively narrow QRS complex due to rapid conduction through the specialized conduction tissue and are characteristically sensitive to verapamil, indicating a calcium-dependent mechanism.^[40] PVCs from the papillary muscles, particularly in the left ventricle, are associated with mitral regurgitation and occur more frequently in patients with underlying cardiomyopathy. These sites contribute to recurrent ectopy in structural heart disease, with origins often linked to fibrotic changes in the papillary muscle heads.^[41] In patients with ischemic heart disease, scar-related PVCs commonly emerge from post-infarct zones, where heterogeneous myocardial scarring creates substrates for arrhythmogenesis. These origins account for a significant portion of PVC burden in such populations, frequently involving re-entrant circuits within the infarct border zone as explored in the pathophysiology section.^[42]

Diagnosis

Initial assessment

The initial assessment of suspected premature ventricular contractions (PVCs) begins with a detailed medical history to identify symptom onset, such as palpitations, dizziness, or fatigue, along with their frequency and potential triggers like caffeine, stress, or exercise.^[13] Family history of arrhythmias or sudden cardiac death is also elicited to screen for inherited conditions.^[43] A thorough physical examination follows, focusing on vital signs including an irregular pulse and cardiac auscultation to detect murmurs suggestive of valvular disease or signs of heart failure such as jugular venous distension or peripheral edema.^[4] Thyroid enlargement is specifically checked due to its association with hyperthyroidism, a known PVC trigger.^[2] Routine electrocardiography (ECG) with a 12-lead recording is essential to confirm PVC presence, assess morphology for origin (e.g., left or right ventricular), and exclude acute issues like ischemia or other arrhythmias.^[13] A short rhythm strip (30-50 seconds) may accompany this to evaluate PVC frequency.^[43] Blood tests are ordered to identify reversible causes, including serum electrolytes (potassium and magnesium) to rule out imbalances, thyroid function tests for hyperthyroidism, and troponin levels to assess for myocardial ischemia if symptoms warrant.^[2]^[44] Echocardiography is recommended to evaluate for structural heart disease, such as cardiomyopathy or valvular abnormalities, in most patients referred for PVCs.^[13] Risk stratification integrates these findings to assess overall cardiovascular risk, particularly in patients with frequent PVCs or indicators of structural heart disease, guiding further evaluation.^[13]

Advanced monitoring

Advanced monitoring techniques play a crucial role in quantifying the frequency, patterns, and burden of premature ventricular contractions (PVCs) over extended periods, enabling more precise risk stratification beyond initial electrocardiographic assessment. These methods are particularly valuable for patients with suspected symptomatic or high-burden PVCs, where short-term recordings may underestimate true prevalence. By capturing ambulatory data during daily activities, advanced monitoring helps correlate PVCs with symptoms and guides decisions on intervention, such as when PVC burden exceeds thresholds associated with cardiomyopathy risk. Holter monitoring involves continuous electrocardiographic (ECG) recording using a portable device worn by the patient for 24 to 48 hours, providing a comprehensive assessment of daily PVC burden. This technique is considered the gold standard for evaluating PVC frequency in symptomatic patients, as it captures a full day's worth of cardiac activity, including variations during sleep, exercise, and stress. PVCs are common in the general population, with prevalence rates of 30-75% on 24-hour Holter monitoring in healthy individuals, though high burdens (>10%) are uncommon and may warrant evaluation if structural heart disease is absent.^[4] Event recorders, also known as ambulatory ECG monitors, extend surveillance to 14 to 30 days for outpatient use, specifically targeting symptomatic episodes that occur infrequently. These devices activate manually or automatically upon detecting irregularities, allowing correlation between patient-reported symptoms like palpitations and actual PVC occurrences. They are particularly useful when Holter monitoring fails to capture events, offering higher diagnostic yield for intermittent PVCs without the need for continuous wear discomfort. Clinical guidelines endorse event recorders for up to 30 days in patients with unexplained symptoms, improving symptom-rhythm correlation.^[43] Implantable loop recorders (ILRs) provide long-term monitoring for up to three years, implanted subcutaneously to detect rare or infrequent PVC events that evade shorter-term devices. These devices continuously record ECG data and store episodes triggered by patient activation or predefined criteria, such as high ventricular rates. ILRs are indicated for patients with infrequent symptoms where diagnosis remains elusive after noninvasive monitoring, with battery life supporting extended follow-up in high-risk cohorts. Studies show diagnostic yields of 30-50% for arrhythmias in unexplained palpitations.^[43] Wearable devices, including smartwatches equipped with photoplethysmography and single-lead ECG capabilities, offer noninvasive, real-time detection of irregular rhythms suggestive of PVCs, validated against Holter monitoring in clinical studies. These consumer-grade tools can identify premature contractions with sensitivity and specificity of approximately 85-95%, particularly for frequent events, though they may underperform for isolated PVCs compared to professional monitors. Validation trials have confirmed their utility in ambulatory settings, with algorithms detecting PVCs in sequences and estimating burden, though they are best used as adjuncts to confirm irregularities prompting formal evaluation.^[45] PVC burden is calculated as the percentage of PVCs relative to the total number of ventricular beats over the monitoring period, serving as a key metric for assessing clinical significance. A burden exceeding 10% to 20% is associated with increased risk of PVC-induced cardiomyopathy and often warrants intervention, such as antiarrhythmic therapy or ablation, particularly if symptoms or ventricular dysfunction are present. Thresholds vary by study, but burdens above 10% on 24-hour monitoring predict adverse outcomes, while those over 20% heighten urgency for suppression.^[13]

Treatment

Conservative approaches

Conservative management of premature ventricular complexes (PVCs) focuses on non-invasive strategies to mitigate symptoms and reduce PVC frequency in patients without structural heart disease or significant burden, prioritizing the identification and elimination of modifiable risk factors. This approach is particularly suitable for asymptomatic individuals or those with low PVC burden, aiming to improve overall cardiac health without pharmacological or procedural interventions.^[46] Trigger avoidance plays a central role in conservative strategies, as certain stimulants and behaviors can exacerbate PVCs. Patients are advised to limit or eliminate caffeine, alcohol, and tobacco intake, as these substances have been associated with increased PVC occurrence; smoking cessation is especially beneficial for long-term risk reduction. Additionally, managing emotional stress through relaxation techniques is recommended, given its potential to provoke arrhythmias in susceptible individuals. Addressing reversible physiological triggers, such as electrolyte imbalances or acute ischemia, further supports this non-invasive framework.^[13]^[2] Lifestyle modifications complement trigger avoidance by promoting sustained cardiac wellness. Regular moderate exercise, tailored to avoid high-intensity activities that may induce PVCs, can enhance cardiovascular fitness and potentially decrease arrhythmia burden. Weight management to achieve an ideal body mass index is encouraged, as obesity correlates with higher PVC prevalence. Prioritizing sleep hygiene—ensuring 7-9 hours of quality rest nightly—also contributes to overall autonomic balance and symptom control.^[13]^[2]^[11] For asymptomatic patients with low-burden PVCs, reassurance is a key component, emphasizing that isolated PVCs in the absence of underlying heart disease pose minimal risk and often do not require intervention. Periodic observation through follow-up electrocardiograms (ECGs) or Holter monitoring is advised to track PVC frequency and ventricular function, with re-evaluation prompted by new symptoms. Beta-blockers may be considered briefly if symptoms persist despite these measures, though details on pharmacotherapy are addressed elsewhere.^[46] The 2022 European Society of Cardiology (ESC) guidelines underscore conservative management for PVC burden less than 10% in asymptomatic patients without structural heart disease, recommending observation with regular assessments of left ventricular ejection fraction (LVEF) and arrhythmia burden as a Class I indication. This approach avoids unnecessary escalation while ensuring timely detection of progression.^[46]

Interventional therapies

Interventional therapies for premature ventricular contractions (PVCs) primarily encompass pharmacotherapy and catheter ablation, reserved for cases where conservative measures fail to alleviate symptoms or mitigate risks such as cardiomyopathy. Pharmacotherapy typically begins with beta-blockers, such as metoprolol, which reduce sympathetic drive and suppress PVC frequency in idiopathic cases originating from the right ventricular outflow tract (RVOT).^[13] Beta-blockers are recommended as first-line agents due to their favorable safety profile, though their efficacy is modest, with clinically meaningful reductions in 12-24% of patients.^[47] For patients with structurally normal hearts and persistent symptoms, class I antiarrhythmics like flecainide are indicated, particularly for RVOT PVCs, as they target sodium channels to suppress ectopic activity without significant proarrhythmic effects in this population. According to European Society of Cardiology guidelines, flecainide carries a class IIa recommendation for symptomatic idiopathic PVCs when ablation is not preferred. A 2024 randomized trial (ECTOPIC) demonstrated flecainide reduced PVC burden by an estimated 10.6 percentage points compared to 2.4 for metoprolol in patients with frequent symptomatic PVCs.^[46]^[48] Catheter ablation serves as a curative option by delivering radiofrequency energy to ablate ectopic foci, achieving acute success rates greater than 80% for RVOT-origin PVCs through precise mapping and targeting of premature activation sites.^[49] Long-term freedom from PVC recurrence post-ablation reaches 83-88% in RVOT cases, with procedural efficacy enhanced by three-dimensional electroanatomic mapping systems.^[50] Ablation is particularly effective for monomorphic PVCs. Indications for these interventions include a PVC burden exceeding 10-20% of total beats, which correlates with increased risk of PVC-induced cardiomyopathy, or persistent symptoms refractory to initial management.^[51] In patients developing left ventricular dysfunction attributable to high-burden PVCs (>15%), ablation is preferred over pharmacotherapy due to higher rates of PVC suppression and cardiomyopathy reversal.^[52] Therapy escalation is also warranted for symptomatic individuals with burdens as low as 10%, prioritizing ablation in those with structural heart disease absence to prevent progression to cardiomyopathy.^[53] Complications from catheter ablation are infrequent, occurring in 0-5% of procedures, with risks including atrioventricular block (1-2% in para-Hisian sites) and cardiac perforation (<1%).^[13] Overall major adverse events remain low at 2.7%, underscoring the procedure's safety profile when performed by experienced operators.^[54] Recent advances include cryoablation for PVCs near critical structures like perivalvular regions, offering reversible lesions that minimize conduction system injury compared to radiofrequency methods. A 2019 study demonstrated successful cryoablation of para-Hisian PVCs without atrioventricular block, achieving complete suppression in challenging cases.^[55] The 2019 HRS/EHRA/APHRS/LAHRS expert consensus highlights cryoablation's role in high-risk sites, with acute success rates approaching 95% and reduced recurrence in perivalvular origins.^[56]

Prognosis and complications

Short-term outcomes

In individuals without structural heart disease, premature ventricular contractions (PVCs) are typically benign, with most episodes resolving spontaneously or upon elimination of identifiable triggers such as caffeine intake, stress, alcohol consumption, or electrolyte disturbances, and they carry no acute mortality risk.^[13]^[3] A 2020 American Heart Association scientific statement confirms that asymptomatic PVCs in otherwise healthy individuals do not increase the risk of short-term cardiac events compared to the general population, supported by long-standing observations from cohort studies like the 1985 Kennedy et al. analysis of 70 patients with frequent PVCs showing excellent short-term prognosis.^[13]^[57] For symptomatic patients with low PVC burden (typically <10% of total beats), lifestyle modifications including avoidance of stimulants, tobacco cessation, stress reduction, and adequate sleep can achieve symptom relief, often leading to substantial reduction in PVC frequency within weeks to months.^[58]^[3] Catheter ablation for idiopathic PVCs offers high acute success, eliminating the targeted PVC morphology in approximately 80% of procedures, with overall success rates reaching 80-95% across multicenter studies of outflow tract origins.^[13]^[59] Post-intervention efficacy is evaluated through repeat 24-hour Holter monitoring, which quantifies PVC burden reduction—typically aiming for <5% of total beats—to confirm symptom resolution and guide further management if needed.^[13]^[3]

Long-term risks

Frequent premature ventricular contractions (PVCs) can lead to arrhythmia-induced cardiomyopathy, a reversible form of left ventricular dysfunction characterized by systolic impairment and dilation, often when the PVC burden exceeds 10% of total beats.^[60] This condition arises from dyssynchronous ventricular activation due to high PVC frequency, resulting in adverse remodeling. In patients with high-frequency PVCs, the risk of developing PVC-induced cardiomyopathy increases with burden, with approximately 40% probability over 15 years for burdens >10%.^[60] In the general population, frequent PVCs are associated with increased mortality, including a doubled risk of cardiac death as demonstrated in a 2013 meta-analysis of observational studies, which reported an adjusted relative risk of 2.64 for sudden cardiac death in individuals with frequent PVCs compared to those without.^[61] This elevated risk persists even in the absence of structural heart disease, highlighting PVCs as an independent prognostic factor for cardiovascular events over long-term follow-up. Progression from PVCs to more malignant ventricular arrhythmias, such as ventricular tachycardia (VT) or ventricular fibrillation (VF), is rare in idiopathic cases without structural heart disease, where the prognosis remains favorable. However, the risk is substantially higher in patients with underlying structural heart disease, where PVCs may serve as triggers for sustained VT or VF, potentially leading to sudden cardiac death.^[62] The left ventricular dysfunction in PVC-induced cardiomyopathy is typically reversible following successful PVC suppression, with normalization of function observed in approximately 68% of cases within 4 months post-ablation and in most patients over a mean of 5 months.^[63] This reversibility underscores the importance of early intervention in high-burden cases to prevent chronic progression. For patients with a PVC burden exceeding 10%, regular monitoring with annual echocardiography is recommended to detect subclinical left ventricular dysfunction and guide timely management.^[13]

Epidemiology

Overall prevalence

Premature ventricular contractions (PVCs) are highly prevalent in the general population when assessed using ambulatory monitoring. Studies employing 24-hour Holter monitoring have detected at least one PVC in 40% to 100% of apparently healthy individuals without structural heart disease.^[64]^[3] Frequent PVCs, defined as more than 30 per hour (approximately >1% burden), occur in 1% to 4% of the population based on standard electrocardiography, with higher rates observed on extended monitoring.^[65]^[13] In healthy adults, PVC prevalence varies by study cohort and monitoring duration. For instance, 24-hour Holter monitoring identified PVCs in 69% of healthy adults aged 25 to 35 years.^[3] In a large screening of U.S. Air Force personnel using brief electrocardiography (approximately 48 seconds), the prevalence was notably lower at 0.78%, highlighting the influence of monitoring length on detection.^[13] Prevalence correlates strongly with age, remaining rare in younger individuals but rising substantially in older adults. PVCs occur in less than 1% of children under 11 years but increase to 40% to 69% in those over 75 years.^[66]^[4] Detection rates are higher with prolonged monitoring compared to standard 24-hour Holter assessments. Extended ambulatory electrocardiography, such as 14-day recording, nearly doubles the identification of patients with high PVC burden (≥10%) relative to 24-hour monitoring alone.^[67] Global estimates are primarily derived from Western populations, showing consistent patterns, though data from other regions remain limited; for example, 24-hour Holter monitoring revealed PVCs in 67.7% of Chinese outpatients evaluated for palpitations.^[68] Recent reviews as of 2025 affirm these trends, with prevalence approaching 100% in elderly individuals on Holter monitoring.^[3]

Population differences

Premature ventricular contractions (PVCs) exhibit notable variations in prevalence across demographic groups. Studies have shown a higher prevalence in men compared to women, with men demonstrating approximately 1.5 to 2 times greater likelihood of PVCs on electrocardiography.^[69]^[70] The frequency of PVCs increases linearly with age, reflecting age-related changes in cardiac electrophysiology. In younger adults (ages 20-39), prevalence is around 30%, rising to 68% in those aged 40-59 and exceeding 80% in individuals aged 60-79; among those 75 years or older, the prevalence can reach up to 69% on 24-hour Holter monitoring.^[71]^[72] Ethnic differences are evident, with higher PVC prevalence observed in African Americans compared to White individuals, particularly in older age groups where rates may be up to twice as high. This disparity persists after adjusting for factors like hypertension and heart disease, as documented in large cohort studies.^[70]^[73] PVC prevalence is substantially elevated in patients with comorbidities such as hypertension and diabetes, with odds ratios indicating 1.2 to 2 times higher risk in affected individuals, independent of other variables.^[70]^[74] Geographically, environmental exposures like fine particulate air pollution (PM2.5) are associated with increased PVC risk (odds ratio 1.06-1.08 per standard deviation increase), potentially contributing to variations in prevalence across regions with differing pollution levels. Data from non-Western regions remain sparse, limiting broader comparisons.^[75]

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Sep 24, 2024 · Those that start in the lower chambers are premature ventricular contractions, or PVCs. Watch an animation of a normal heartbeat.Missing: Purkinje fibers myocytes distinction classification extrasystole benign
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The Ubiquitous Premature Ventricular Complex - PMC - NIH
Jan 7, 2020 · Premature ventricular complexes (PVCs) are one of the most commonly encountered arrhythmias and are ubiquitous in clinical practice.
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Management of Premature Ventricular Complexes in the Outpatient ...
High burden of asymptomatic PVCs (>10%). PVCs that come in quick succession to prior non-PVC beats (so-called close or short, coupled PVCs). Short-coupled ...
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Premature Ventricular Complexes: Benign versus Malignant - NIH
1). Commonly patients with symptomatic PVCs present with palpitations, skipped beats, chest discomfort, or lightheadedness.
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Premature Ventricular Contractions in Athletes: Insight into ...
May 27, 2022 · PVCs induced by exercise raise concern for underlying diseases including ion channelopathies, myocarditis, cardiomyopathy, or ischemia ...
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Premature Ventricular Contractions | Cedars-Sinai
Premature ventricular contractions (PVCs) are a type of abnormal heartbeat. Your heart has 4 chambers: 2 upper atria and 2 lower ventricles.
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Exercise-Induced Ventricular Ectopy and Cardiovascular Mortality in ...
Nov 29, 2021 · High-grade PVCs occurring during recovery were associated with long-term risk of cardiovascular mortality in asymptomatic individuals.
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When Should Premature Ventricular Contractions Be Considered as ...
Dec 10, 2021 · For this reason, a family history of cardiomyopathy, channelopathy or sudden cardiac death should raise concerns when evaluating children with ...
[22]
2015 ESC Guidelines for the management of patients with ...
Aug 29, 2015 · A family history of recurrent premature SUDS or inheritable heart disease represents a 'red flag' that makes familial evaluation strongly ...
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Premature Ventricular Contraction - Yale Medicine
What causes premature ventricular contraction? · High caffeine consumption · High anxiety levels · Sleep deprivation · The presence of the stress hormones ...
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Postprandial premature ventricular contractions provoked by ...
Nov 1, 2025 · Herein, we report a rare case of reproducible postprandial PVCs provoked by gastric distension after intraoperative oral ingestion of jelly ...Postprandial Premature... · Case Report · Discussion
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PREMATURE VENTRICULAR CONTRACTIONS - Clinical Advisor
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Which Medicines Might Raise My Heart Rate? - WebMD
Aug 2, 2024 · Tachycardia, or a fast heart rate, can be caused by many medications, including antibiotics, antidepressants, and even certain supplements.
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The Role of Hypomagnesemia in Cardiac Arrhythmias - NIH
Sep 21, 2022 · A low magnesium level has been suggested to increase the number of premature atrial and ventricular contractions in healthy subjects. A small ...
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Cardiomyopathy in Children: Classification and Diagnosis
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The Role of Thyroid Diseases and their Medications in ...
Both hyper and hypothyroidism can cause important alterations in cardiac rhythm, output and contractility as well as vascular resistance and blood pressure.
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Current Concepts of Premature Ventricular Contractions - PMC - NIH
For the treatment PVCs, it is important to consider underlying heart disease, the frequency of the PVCs and the frequency and severity of symptoms.Missing: typical | Show results with:typical
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Pathophysiological Mechanisms of Premature Ventricular Complexes
May 13, 2020 · This review aims to provide an overview of the potential pathophysiological mechanisms of PVCs and their differentiation.
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Ablating Premature Ventricular Complexes: Justification ... - NIH
PVCs related to myocardial scar stem from a slowly conducting protected isthmus within the scar that can cause reentrant beats following unidirectional block.
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Stochastic spontaneous calcium release events trigger premature ...
Premature ventricular complexes (PVCs) due to spontaneous calcium (Ca) release (SCR) events at the cell level can precipitate ventricular arrhythmias.
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Focal gap junction uncoupling and spontaneous ventricular ectopy
Gap junction expression in these hearts is highly abnormal, with well-circumscribed foci of Cx43-deficient myocytes interspersed throughout an otherwise well- ...
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Synchronization of Early Afterdepolarizations and Arrhythmogenesis ...
We studied the effects of the spatial distribution of the cell properties and gap junction coupling on EAD synchronization, PVC formation, and multiple focal ...
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Prognostic Significance of PVCs and Resting Heart Rate - PMC - NIH
Our findings support the hypothesis that activation of the sympathetic nervous system is an important factor in the genesis of PVCs and ventricular arrhythmias.Missing: threshold | Show results with:threshold
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https://www.ahajournals.org/doi/10.1161/CIRCEP.114.002065
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Differentiating Right- and Left-Sided Outflow Tract Ventricular ...
Jun 4, 2019 · This review will summarize all of the published 12-lead ECG algorithms used to guide localization of OT ventricular arrhythmias.
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Diagnosis and Treatment of Idiopathic Premature Ventricular ... - MDPI
In particular, the RVOT is the most common SOO, harboring 80% of OT-PVCs, whereas up to 20% of OT-PVCs originate from the LVOT and near structures, including ...2. Prevalence And Mechanism · 3.1. Outflow Tract... · 4. Diagnostic Work-Up<|control11|><|separator|>
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Non-Reentrant Fascicular Tachycardia | Circulation: Arrhythmia and ...
Oct 11, 2016 · Among 530 idiopathic VT patients who were referred for ablation, we identified 15 (2.8%) with non-reentrant fascicular tachycardia (11 men, ...
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Differentiation of Papillary Muscle From Fascicular and Mitral ...
Jun 16, 2015 · Patients with papillary muscle VAs were older and had higher prevalence of left ventricular dysfunction (67% versus 13% of fascicular VA ...
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Relationship of frequent postinfarction premature ventricular ...
The results of this study show that PVCs in patients with prior myocardial infarction most often arise within an infarct scar. The site of origin of the PVCs ...
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2017 AHA/ACC/HRS Guideline for Management of Patients With ...
Aug 1, 2018 · Structural heart disease*, This term encompasses IHD, all types of cardiomyopathy, valvular heart disease, and adult congenital heart disease.
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Premature Ventricular Complexes Workup - Medscape Reference
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Idiopathic premature ventricular complexes treatment - NIH
Aug 2, 2023 · Beta‐blockers (BB) or dihydropyridine calcium channel blockers (CCBs) are still the first choices in the treatment of idiopathic premature ...
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Flecainide for Idiopathic PVCs & Cardiomyopathy: UNIFLECA Trial
Mar 29, 2025 · Current guidelines, supported by limited evidence, recommend flecainide for PVCs originating from the ventricular outflow tract (Class IIa).
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Reappraising Use of Flecainide for Atrial Fibrillation and Ventricular ...
According to the 2022 ESC guidelines, flecainide is recommended as a class IIa treatment for symptomatic idiopathic PVCs when catheter ablation is not preferred ...1. Introduction · 1.1. Old And New Evidence · 1.1. 2. Flecainide In...<|separator|>
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Catheter Ablation vs Antiarrhythmic Drug Therapy for Treatment of ...
Mar 22, 2023 · Finally, radiofrequency catheter ablation (CA) for PVCs has procedural success rates of 80% to 95%; however, these approaches are invasive, and ...
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Long-Term Follow-Up of Catheter Ablation for Premature Ventricular ...
Nov 6, 2022 · CA of CC PVCs showed favorable outcomes at long-term follow-up (83.2%), ranging between RVOT and LVOT success rate (88.2% and 80.0%, ...3. Results · 3.3. Study Outcomes And... · 4.1. Pvc Ablation And...
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Similarly high success and low complication rates of catheter ... - PMC
May 24, 2023 · Success rates for RVOT and LVOT origin were 98% (46/47 cases) and 97% (38/39 cases) respectively. No significant differences in procedure time ( ...
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Arrhythmia-Induced Cardiomyopathy: Key Points
Jun 3, 2024 · PVC-CM is characterized by mild to moderate LV dysfunction, LV enlargement, mild mitral regurgitation, and left atrial enlargement, which ...Missing: features | Show results with:features<|control11|><|separator|>
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Premature Ventricular Complex–Induced Cardiomyopathy - JACC
May 20, 2019 · Frequent premature ventricular complexes (PVCs) can cause an often reversible form of cardiomyopathy.
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Clinical Approach to Patients with Frequent PVCs
Premature ventricular complexes, or PVCs, are a common clinical problem. While patients may be asymptomatic, typically these PVCs cause sensations of ...
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The safety of catheter ablation for premature ventricular contractions ...
Aug 31, 2018 · The overall success rate was 94.1%. The overall complication rate was 2.7%. By multivariate logistic regression analysis, origins of EPI and LV ...Complications · Safety Of Pvcs Ablation · Efficacy Of Ablation
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Successful catheter cryoablation for premature ventricular ...
Jun 25, 2019 · We performed catheter cryoablation of PVCs, originating from the para-Hisian region, without causing atrioventricular conduction disturbances.
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2019 HRS/EHRA/APHRS/LAHRS expert consensus statement on ...
In symptomatic patients with frequent PVCs from the RVOT, catheter ablation had a higher rate of efficacy than pharmacotherapy with either metoprolol or ...
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Premature ventricular contractions (PVCs) - Diagnosis & treatment
Sep 20, 2025 · It can diagnose PVCs. Sticky patches with sensors on them go on the chest and sometimes the arms and legs. Wires connect the sensors to a ...
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Multicenter Outcomes for Catheter Ablation of Idiopathic Premature ...
This study is the first large-scale, multicenter analysis of outcomes of ablation of idiopathic PVCs. The overall acute success rate of PVC ablation was 84%.
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Premature Ventricular Contractions | Circulation
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Premature ventricular contractions: Reassure or refer?
Jul 1, 2016 · A right bundle branch block pattern PVC does not imply the presence of underlying structural heart disease. PVCs may arise from both the ...Abstract · Initial Evaluation · Idiopathic Pvcs
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Meta-analysis of ventricular premature complexes and their relation ...
Oct 15, 2013 · The overall adjusted relative risk for sudden cardiac death comparing participants with frequent VPCs versus those without frequent VPCs was ...
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Ventricular Arrhythmias in the Absence of Structural Heart Disease
May 7, 2012 · The overwhelming majority of VAs in patients without structural heart disease carry an excellent prognosis, and include premature ventricular ...
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Recovery from left ventricular dysfunction after ablation of ... - PubMed
PVC-induced cardiomyopathy resolves within 4 months of successful ablation in most patients. In about one-third of the patients, recovery is delayed and can ...Missing: reversibility 80-90%
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Premature Ventricular Contractions (PVCs) - DynaMed
Jun 28, 2024 · The most common origin of PVCs is the right ventricular outflow tract (RVOT) in patients without structural heart disease and the left ventricle ...
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The Influence of Lifestyle Factors on the Occurrence and Severity of ...
Caffeine and drugs precipitate heightened cardiac stimulation, precipitating PVCs. Excessive alcohol and nicotine disturb the electrical pathways resulting in ...
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Premature Ventricular Contraction-Induced Cardiomyopathy
Feb 1, 2012 · They may cause troubling and sometimes incapacitating symptoms such as palpitations, chest pain, presyncope, syncope, and heart failure.
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Longer Ambulatory ECG Monitoring Increases Identification of ...
Most patients with PVC burdens ≥20% were detected with 24 hours of monitoring, extended monitoring nearly doubled the identification of those reaching the 10% ...
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Prevalence and heart rate variability characteristics of ... - BMJ Open
The prevalence of PVC and frequent PVCs were 67.7% and 7.7%, respectively, detected by 24-hour Holter among Chinese outpatients with palpitations.24-Hour Holter Monitoring · Prevalence Of Pvc Detected... · Pvc Burden And Lv Systolic...<|control11|><|separator|>
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The effect of age, blood pressure and gender on the ... - PubMed
On the contrary, apparently normal (Group I) men had almost twice the PVC prevalence (74.6% vs. 41.1%, p less than 0.001) and complexity (20.1% vs. 10.1%, p ...
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the Atherosclerosis Risk in Communities (ARIC) study - PubMed - NIH
Conclusions: The prevalence of PVCs on a 2-minute ECG differs by age, ethnicity, and sex and is associated with hypertension, heart disease, faster sinus rates, ...
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Premature ventricular beats in healthy adult subjects 20 to 79 years ...
The prevalence of PVBs increased significantly with age: 31, 68 and 84% in the respective age groups: 20-39, 40-59 and 60-79 (P less than 0.05).Missing: contractions | Show results with:contractions
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Mechanisms and Risk Factors for Premature Ventricular Contraction ...
The prevalence is up to 69% in individuals aged 75 years or older, while it is lower than 1% in children aged 0–11 years. PVCs are generally considered to be ...
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The Atherosclerosis Risk in Communities (ARIC) study - ScienceDirect
Prevalence of premature ventricular contractions in a population of African American and white men and women: The Atherosclerosis Risk in Communities (ARIC) ...
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Premature ventricular contraction is associated with increased risk of ...
Jan 15, 2021 · In our cohort, people with PVC were older and had higher prevalence of hypertension and diabetes, which are all risk factors associated with AF.
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Fine Particulate Air Pollution and Premature Ventricular Contractions
Our findings suggest that PM 2.5 exposure is associated with an increased risk for PVCs in a biracial population-based study of men and women.