M-mode echocardiograms can be used to detect three kinds of abnormality of left ventricular function: an increase in cavity size; an abnormal rate of wall movement; and incoordinate contraction and relaxation. These disturbances are mutually independent. Any may occur on its own or in combination, and a change in one towards normal may be accompanied by change for the worse in another so that it would be wrong to regard ventricular performance as capable of description by a single quantity, such as a measure of contractility. The accuracy of definition offered by echocardiography has been valuable in allowing incoordinate behaviour, despite the limitation of examining only one dimension. Angiography should be regarded as a complementary technique, the advantage of a two-dimensional picture being offset by its soft edges and poor frequency response. The two methods have recently tended to develop in parallel, ideas gained from the one being confirmed by the other, and the value of each has thereby been enhanced.
|Original language||English (US)|
|Number of pages||10|
|Journal||British Journal of Clinical Equipment|
|State||Published - Jan 1 1977|
ASJC Scopus subject areas