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Hypertrophic obstructive cardiomyopathy is defined by massive ventricular hypertrophy that always occurs, whereas obstruction may be absent.
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The authors propose adding the term 'hypertrophic' to 'obstructive cardiomyopathy' to reflect that massive ventricular hypertrophy is always present even when obstruction is absent.
The term obstructive cardiomyopathy has been used to describe a rare disorder of heart muscle in which abnormal ventricular function is associated with massive cardiac hypertrophy (Goodwin et al., 1960). Since recent experience has shown that obstruction may be absent although massive ventricular hypertrophy always occurs, we have added the term "hypertrophic" to our definition.
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Cohen et al. (1964) studied this question. Hypertrophic obstructive cardiomyopathy is defined by massive ventricular hypertrophy that always occurs, whereas obstruction may be absent.
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