Hypertrophic cardiomyopathy is the thickening of the muscles that make up the heart. The thickening may interfere with the normal functioning of the heart by:
- Narrowing the outflow of the ventricle
- Reducing the ability of the heart to relax and fill with blood during the relaxation phase
- Reducing the ability of the valves of the heart to function properly
Any situation that increases the contraction or rate of contraction of the heart muscle can worsen these symptoms.
Review Date 4/30/2020
Updated by: Thomas S. Metkus, MD, Assistant Professor of Medicine and Surgery, Johns Hopkins University School of Medicine, Baltimore, MD. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.