The cardiac photoscan is a helpful diagnostic tool for the evaluation of suspected pericardial effusion, particularly with critically ill patients who cannot tolerate angiography. This innocuous procedure can be performed in a few minutes with the use of sodium pertechnetate Tc 99m as the source of radioactivity. In one study, a life-threatening, loculated pericardial effusion was demonstrable only by the photoscan.
Lewis RJ, Vogel JM. Emergency Cardiac Photoscan. JAMA. 1968;205(1):27–30. doi:10.1001/jama.1968.03140270051009
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