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[Sudden death risk factors in patients with hypertrophic cardiomyopathy]
Insights
Hypertrophic cardiomyopathy patients with thicker septums and specific risk factors face higher ventricular arrhythmia risks. Early identification of these factors is crucial for managing sudden cardiac death risk.
Area of Science:
- Cardiology
- Clinical Electrophysiology
Context:
- Hypertrophic cardiomyopathy (HCM) is a complex cardiac condition.
- Assessing arrhythmia risk is vital for patient management.
Purpose:
- To investigate the relationship between echocardiographic findings, Holter monitoring, and sudden cardiac death risk factors in HCM patients.
Summary:
- Ventricular arrhythmias were detected in 59.9% of 79 HCM patients via ECG Holter monitoring.
- Higher-grade arrhythmias correlated with thicker intraventricular septum, increased ejection fraction, and lower myocardial mass.
- Seven patients lacked significant arrhythmias but had multiple sudden cardiac death risk factors, indicating elevated risk.
Impact:
- Identifies specific echocardiographic markers associated with severe ventricular arrhythmias in HCM.
- Highlights the importance of considering combined risk factors for sudden cardiac death assessment.
- Informs clinical strategies for risk stratification and preventative care in hypertrophic cardiomyopathy.
Abstract:
In 79 patients aged 13-65 (mean 36.6) with different types of the hypertrophic cardiomyopathy ECG Holter's monitorings, M-mode and 2-dimensional echocardiographic examinations as well as hemodynamic ones were performed. Ventricular arrhythmias were observed in ECG Holter's recordings in 59.9% of patients. More frequent occurrence of higher grades (3, 4, 5 grades by Lown's classification) of ventricular arrhythmias were stated in patients with significantly thicker intraventricular septum, increase of a left ventricular ejection fraction and a lower left ventricular myocardial mass. There were observed 7 patients without significant forms of ventricular arrhythmias in ECG 24-hours monitoring, but with several, coexisting, well known in literature sudden cardiac death risk factors such as: history of cardiac arrest, sudden cardiac death occurrences in a family before the age of 50, preexcitation syndrome, ecg repolarization disorders, history of fainting, physical activity performance or mental stress. It was stated, that risk of severe ventricular arrhythmias occurrence or a sudden cardiac death in patients with coexisting several, above mentioned, risk factors is higher than in remaining patients with the hypertrophic cardiomyopathy.