Apical segmental dysfunction in hypertrophic cardiomyopathy: subgroup with unique clinical features

Area of Science:

• Cardiology
• Cardiovascular Medicine
• Clinical Research

Background:

• Segmental wall motion abnormalities are infrequently observed in hypertrophic cardiomyopathy (HCM).
• Understanding the clinical significance of these abnormalities is crucial for patient management.

Purpose of the Study:

• To investigate the clinical significance of apical segmental wall motion abnormalities in patients with hypertrophic cardiomyopathy.
• To identify potential diagnostic markers and associated complications of this specific HCM phenotype.

Main Methods:

• Analysis of 48 patients with hypertrophic cardiomyopathy, divided into Group A (apical segmental dysfunction) and Group B (normal wall motion).
• Assessment included selective coronary arteriography, left ventriculography, echocardiography, electrocardiogram (ECG), and 24-hour ambulatory ECG monitoring.
• Comparison of clinical and diagnostic findings between Group A and Group B.

Main Results:

• Apical segmental dysfunction was confirmed by left ventriculography in all 8 patients in Group A, but only detected in 2 by echocardiography.
• Abnormal Q waves on ECG were significantly more frequent in Group A (p < 0.005), often in lateral leads, with serial ECGs showing development in 6/8 patients.
• Malignant arrhythmias were more common in Group A (p < 0.001), and two patients developed left ventricular dilation and congestive heart failure.
• No significant coronary artery stenosis was found in any patient.

Conclusions:

• The presence of lateral Q waves on ECG may indicate apical segmental dysfunction in hypertrophic cardiomyopathy.
• Left ventriculography and 24-hour ambulatory ECG monitoring are recommended for patients with lateral Q waves and HCM.
• Patients with this unique HCM presentation require vigilant follow-up due to potential for malignant arrhythmias and heart failure progression.