Heart 1999;81:229-231 ( March )

Editorial

Long axis function in disease

The first 150 words of the full text of this article appear below.

Although longitudinally directed fibressituated mainly in the subepicardium and subendocardium regions of the left and right ventricular free walls and the papillary musclescomprise only a small proportion of the total ventricular myocardial mass, they play a major role in the maintenance of normal ejection fraction and in determining atrioventricular interactions.¹ Not surprisingly, therefore, loss of longitudinal fibre function leads to characteristic disturbances.

Systolic function

Longitudinal function is always reduced when ventricular cavity size is increased, in addition ejection fraction is reduced and may be absent.^2 3 This relation is consistent enough for long axis amplitude, or its equivalent, the amplitude of atrioventricular ring motion, to be used as an index of ejection fraction.⁴ It applies not only to the left ventricle, where it can be shown to relate to prognosis but also to the right, where it provides a simple method of assessing right ventricular function.⁵ When overall long . . . [Full text of this article]

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