[Methodology of myocardial scintigraphy with thallium 201: limits of pathological findings]

Thallium 201 is a useful agent for demonstrating ischemic myocardia. It is injected during maximum stress, the stress situation is then continued for a further 2 min and a series of scans are carried out 5-25 min after injection. The series is repeated 3-5 h after injection, thereby obtaining pictures of myocardial resting and stress perfusion. Repitition of the study without stress reveals no further data. In follow-up examinations under the same stress situation the perfusion defects remain the same. 27 normal subjects were evaluated and the limits between normal and pathologic scans established.