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Hypertrophic cardiomyopathy: Morphologic variants and the pathophysiology of left ventricular outflow tract obstruction

Author
Martin S Maron, MD
Section Editor
William J McKenna, MD
Deputy Editor
Brian C Downey, MD, FACC

INTRODUCTION

Hypertrophic cardiomyopathy (HCM) is a genetically determined heart muscle disease most often (60 to 70 percent) caused by mutations in one of several sarcomere genes which encode components of the contractile apparatus. (See "Hypertrophic cardiomyopathy: Gene mutations and clinical genetic testing".)

HCM is characterized by left ventricular hypertrophy of various morphologies, with a wide array of clinical manifestations and hemodynamic abnormalities (figure 1). Depending in part upon the site and extent of cardiac hypertrophy, HCM patients can develop one or more of the following abnormalities:

Left ventricular outflow obstruction (LVOT)

Diastolic dysfunction

Myocardial ischemia

                

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Literature review current through: Nov 2016. | This topic last updated: Thu Oct 06 00:00:00 GMT 2016.
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