A double apical impulse has been described as a physical sign in hypertrophic obstructive cardiomyopathy (Mounsey, 1959; Braunwald et al., 1960; Boiteau and Allenstein, 1961; Pare et al., 1961; Benchimol, Legler, and Dimond, 1963; Cohen et al., 1964; Gillam, Deliyannis, and Mounsey, 1964; Tafur, Cohen, and Levine, 1964). In this study we have used the impulse cardiogram, which is an optical rec...
