Coronarography can be used as a diagnostic test when the clinical eval
uation and the non-invasive test are inconclusive, although some conce
ptual problems remain. In known ischemic heart disease, the estimation
of the prognosis is an important factor for the treatment decision, b
ut coronary arteriography does not give a clear picture, and apart fro
m the most severely ill patient, the prognosis usually remains very di
fficult to evaluate.