The significance of systolic anterior motion (SAM) on the

echographic SAM would have a simi.lar mechanism and significance. The demonstration of a close relationship be­ tween the form of SAM and the severity of haemodynamic LVOT obstruction seemed to support this view (11, 34). There are, however, several features of SAM in echocardiography which make such an explanation un­ satisfactory.

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