Right ventricular diastolic collapse and right atrial collapse on 2D echocardiography are key sensitive signs for diagnosing cardiac tamponade, though they must be interpreted within the patient's hemodynamic context.
Integrate RV/RA collapse with hemodynamics to avoid misdiagnosis; confirms echo criteria but leaves open prospective validation in contemporary cohorts.
Summary M‐mode echocardiography has a limited role in the diagnosis of cardiac tamponade. Right ventricular diastolic collapse observed on the two‐dimensional echocardiogram is both sensitive and specific for cardiac tamponade in the absence of pressure overload of the right ventricle. Right atrial collapse is a highly sensitive but less specific sign for cardiac tamponade. Both of these signs should be used with caution, however, taking into consideration the intravascular status and the state of the left Ventricular volume.
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Sagar et al. (1987) studied this question.
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