Key result
Higher PVC burden linked to ~3-fold greater LGE in HCM without NSVT.
Why the study?
Although NSVT is a risk factor for sudden cardiac death in HCM, the impact of PVC burden in the absence of NSVT is not well-known.
Is premature ventricular contraction burden associated with myocardial fibrosis and genetic mutations in patients with hypertrophic cardiomyopathy without nonsustained ventricular tachycardia?
Observational (n=84)
No
Is premature ventricular contraction burden associated with myocardial fibrosis and genetic mutations in patients with hypertrophic cardiomyopathy without nonsustained ventricular tachycardia?
In patients with hypertrophic cardiomyopathy without nonsustained ventricular tachycardia, a higher PVC burden is significantly associated with increased myocardial fibrosis and thick filament gene mutations.
BACKGROUND: Although nonsustained ventricular tachycardia (NSVT) is a risk factor for sudden cardiac death in hypertrophic-cardiomyopathy (HCM), the impact of premature ventricular contraction (PVC) burden, in the absence of NSVT, is not well-known. HYPOTHESIS: PVC burden may be associated with myocardial fibrosis and genetic mutations in patients with HCM. METHODS: Of the 212 patients prospectively enrolled to the HCM registry of genetics, 84 were evaluated with both cardiac magnetic resonance, 24-hour Holter monitoring and genetic analysis. Among them, 71 patients have not been diagnosed with NSVT. RESULTS: Patients with NSVT (n = 13) had a higher late gadolinium enhancement (LGE) amount, extracellular volume fraction (ECV), and prevalence of sarcomere mutations compared with patients without NSVT. Among patients without NSVT, those with LGE (n = 46) had a higher total PVC (109 ± 332 vs 7 ± 13, P = .003) and PVC burden (0.114 ± 0.225 vs 0.008 ± 0.014%, P = .003) during 24-hour Holter monitoring compared with others. The %LGE and global ECV were correlated with PVC burden (r = 0.377, P = .001; r = 0.401, P = .001). The optimal cutoff value for PVC number for LGE was 45 (37.0% and 100% sensitivity and specificity, respectively) with 0.733 of the area under the receiver operating characteristic-curve (P < .001). Thick filament gene mutation was more prevalent in the higher PVC burden group (41.2% vs 16.7%, P = .048). CONCLUSION: Total PVC burden is significantly related to increase in myocardial fibrosis in HCM patients without NSVT.
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Chung et al. (2020) conducted an observational in Hypertrophic cardiomyopathy (n=84). Premature ventricular contraction (PVC) burden vs. Lower PVC burden (<45 beats) was evaluated on Percentage of late gadolinium enhancement (%LGE) of the left ventricle (p=0.004). In patients with hypertrophic cardiomyopathy without nonsustained ventricular tachycardia, a higher premature ventricular contraction burden (≥45 beats) was significantly associated with a greater amount of late gadolinium enhancement (14.1% vs 4.7%).
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