In patients without structural heart disease, PVCs originating from the outflow tracts or right ventricle were associated with a significantly lower risk of mortality and cardiovascular morbidity.
Cohort (n=511)
Does the site of origin and QRS-width of premature ventricular contractions affect the risk of mortality and cardiovascular morbidity in patients without structural heart disease?
In patients without structural heart disease, PVCs originating from the outflow tracts or right ventricle are associated with a more favorable prognosis compared to non-outflow tract or left ventricular PVCs.
BACKGROUND: Premature ventricular contractions (PVCs) are a common form of arrhythmia associated with an unfavorable prognosis in patients with structural heart disease. It is unclear whether PVCs site of origin and QRS-width has a prognostic significance in patients without structural heart disease. The aim of this study was to assess the prognostic importance of PVCs morphology and duration in this patient group. METHODS: We included 511 consecutive patients without a history of previous heart disease. They were examined with echocardiography and exercise test with normal findings. We categorized the PVCs from a 12 lead ECG according to morphology and width of the QRS-complex and analyzed the outcome in terms of a composite endpoint of total mortality and cardiovascular morbidity. RESULTS: During a median follow-up time of 5.3 years, 19 patients (3.5%) died and 61 (11.3%) met the composite outcome. Patients with PVCs originating from the outflow tracts had a significantly lower risk for the composite outcome compared to patients with non-OT-PVCs. Similarly, patients with PVC originating from the right ventricle had a better outcome than patients with left ventricular PCVs. No difference in outcome depending on QRS-width during PVCs was noticed. CONCLUSION: In our cohort of consecutively included PVC patients without structural heart disease PVCs from the outflow tracts were associated with a better prognostic outcome than non-OT PVCs; the same was true for right ventricular PVCs when compared to left ventricular ones. The classification of the origin of the PVCs was based on 12-lead ECG morphology. QRS-width during PVC did not seem to have prognostic significance.
Scorza et al. (Fri,) conducted a cohort in Premature ventricular contractions without structural heart disease (n=511). PVCs originating from the outflow tracts or right ventricle vs. Non-outflow tract or left ventricular PVCs was evaluated on Composite of total mortality and cardiovascular morbidity. In patients without structural heart disease, PVCs originating from the outflow tracts or right ventricle were associated with a significantly lower risk of mortality and cardiovascular morbidity.
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