Severe cardiac conduction disturbances and pacemaker implantation in patients with hypertrophic cardiomyopathy

Area of Science:

• Cardiology
• Genetics
• Electrophysiology

Background:

• Hypertrophic cardiomyopathy (HCM) is a primary cardiac disease.
• Cardiac conduction disturbances are a known complication of HCM.
• The prevalence and characteristics of severe conduction issues requiring pacemakers in HCM are not fully understood.

Purpose of the Study:

• To determine the prevalence of severe cardiac conduction disturbances in a large cohort of HCM patients.
• To characterize patients with HCM who require permanent pacemaker implantation.
• To describe the outcomes for HCM patients receiving pacemakers and explore potential familial links.

Main Methods:

• Retrospective analysis of 451 patients diagnosed with hypertrophic cardiomyopathy.
• Review of medical records to identify patients who received permanent pacemaker implantation.
• Analysis of reasons for pacemaker implantation, including sinus node dysfunction and atrioventricular conduction disturbances.
• Assessment of family history for pacemaker implantation.

Main Results:

• Permanent pacemaker implantation was required in 48 patients (11%) of the cohort.
• Sinus node dysfunction accounted for 20 pacemaker implantations, while 28 were for atrioventricular conduction disturbances.
• Primary bradyarrhythmia led to pacemaker implantation in 36 patients (8%).
• A familial component was noted, with 18% of patients having at least one family member with a permanent pacemaker.

Conclusions:

• Severe cardiac conduction disturbances requiring permanent pacemaker implantation are prevalent in hypertrophic cardiomyopathy.
• Hypertrophic cardiomyopathy patients necessitating pacemakers exhibit specific conduction issues like sinus node dysfunction and AV block.
• The observed familial occurrence suggests a potential genetic basis for severe conduction disturbances in HCM, warranting further investigation and family screening.