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[Systolic and diastolic left ventricular function in hypertrophic obstructive cardiomyopathy]
Insights
Symptoms in hypertrophic obstructive cardiomyopathy (HOCM) stem from diastolic dysfunction, not systolic impairment. Left ventricular distensibility and myocardial compliance are significantly reduced in most HOCM patients.
Area of Science:
- Cardiology
- Cardiovascular Physiology
- Medical Imaging
Context:
- Hypertrophic obstructive cardiomyopathy (HOCM) presents complex challenges in understanding its pathophysiology.
- Accurate assessment of cardiac function is crucial for managing HOCM patients.
Purpose:
- To analyze systolic and diastolic left ventricular and myocardial performance in patients with HOCM.
- To correlate cardiac function abnormalities with clinical symptoms in HOCM.
Summary:
- Biplane cineangiograms and pressure recordings in ten HOCM patients revealed normal average left ventricular systolic function despite geometric abnormalities.
- Nine out of ten patients exhibited reduced left ventricular distensibility and myocardial compliance, indicating diastolic dysfunction.
- The study concludes that HOCM symptoms are primarily driven by impaired diastolic function, not systolic pump failure.
Impact:
- This research clarifies the primary mechanism behind HOCM symptoms, shifting focus to diastolic dysfunction.
- Findings can inform diagnostic strategies and therapeutic targets for improving quality of life in HOCM patients.
- Highlights the importance of assessing diastolic function in hypertrophic cardiomyopathy.
Abstract:
Systolic and diastolic left ventricular and myocardial performance were analysed in ten patients with hypertrophic obstructive cardiomyopathy (HOCM) from biplane cineangiograms and simultaneous pressure recordings. In spite of significant geometrical abnormalities, pump function of the left ventricle on the average was normal. Only in two cases ejection fraction and isovolumic phase indices, respectively, were moderately reduced. On the contrary nine of ten patients had a considerable reduction of left ventricular distensibility, partly due to a decreased myocardial compliance. The symptoms of patients with HOCM cannot be explained by an impaired systolic pump function, they are primarily caused by a disturbed ventricular und myocardial function during diastole.