Captopril renography. Considerations in the selection of radiopharmaceuticals, provocative agents, and hypertensive subjects.

Captopril renography is an excellent technique for investigating renovascular hypertension and other renal disturbances. However, many variables affect the usefulness of renographic data. The choices of radiopharmaceutical, converting enzyme inhibitor, and the type of imaging done must be made with care. Additionally, the method for selecting a study population must be carefully examined. Incorrect choices can render a study's data valueless. In this paper we delineate the questions that need to be considered before undertaking a renographic study.