[Value of the ergometric test after myocardial infarction].
Exercise stress testing (EST) after myocardial infarction helps to define the clinical subsets of patients at high and low risk. It should be performed before hospital discharge, unless a contraindication exists. In order to exclude false positives, EST must be repeated 4-6 weeks later. EST helps to recognize the presence of residual ischaemia. Significant ST segment depression during exercise, associated or not with angina, is the most important indicator of ischemia. These patients with ischaemia at distance i.e., those with ST segment changes in ECG leads without W waves, are at high risk. Some continuous exercise variables (degree of ST deviation, time of recovery and exercise duration) are related to cardiac mortality. Exercise induced complex ventricular arrhythmias seem to be related to left main or three vessels disease, and a greater likelihood of sudden death, particularly when coexist a low ejection fraction, important segmentar disturbances of contractility and ST segment depression. EST after myocardial infarction has great value to assess the results of medical therapy and/or coronary angioplasty or bypass grafting. EST also constitutes a valuable clinical tool to support a comprehensive rehabilitation programme.
Carvalho
M
M
Serviço de Medicina IV, Faculdade de Medicina de Lisboa.
de Lacerda
A P
AP
Carrageta
M
M
D002985:Clinical Protocols; D005080:Exercise Test; D006801:Humans; D009203:Myocardial Infarction / Q000503:physiopathology*
Valor da prova ergométrica no pós-enfarte do miocárdio.