Evaluating the systolic function of the RV is an important skill and there are described methods.
One of the simplest method is using the tricuspid annular plane of systolic excursion (or T.A.P.S.E.)
This is how far the tricuspid annulus travels from diastole to systole because the RV contracts in a longitudinal fashion from the base (diastole) to the apex (systole)
A TAPSE of <17mm is consistent with abnormal function and >17mm is normal. An eyeball method of assessment can be done when grossly obvious or M-mode can be used when an accurate assessment is required.
The clip below demonstrates the technique, which should always be performed from an apical four-chamber view.
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