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Late recurrent ischemia in infarct patients with a normal predischarge exercise test after thrombolysis

B E Marx1, O Bertel, F W Amann

  • 1Cardiology Unit, Triemli Hospital, Zurich, Switzerland.

European Heart Journal
|October 1, 1990
PubMed

Insights

A normal predischarge exercise test has limited value in predicting future cardiac events after myocardial infarction treated with thrombolysis. Many patients still experience ischemia, highlighting the need for careful long-term monitoring.

Area of Science:

  • Cardiology
  • Internal Medicine

Background:

  • Acute myocardial infarction (AMI) management has advanced with early reperfusion therapies.
  • Assessing residual myocardial viability and risk post-AMI is crucial for guiding treatment strategies.

Purpose of the Study:

  • To evaluate the prognostic significance of a normal predischarge exercise test (DET) in patients following AMI treated with intravenous thrombolysis.
  • To determine if a normal DET accurately identifies patients at low risk for recurrent ischemic events.

Main Methods:

  • Prospective investigation of 109 patients post-AMI treated within 4 hours with i.v. thrombolysis.
  • Patients underwent coronary angiography, with 29 receiving percutaneous transluminal coronary angioplasty (PTCA) or bypass surgery, while 80 were managed conservatively.
  • Long-term follow-up (12.0 +/- 6.2 months) assessed recurrent ischemia and reinfarction rates in relation to DET results.

Main Results:

  • Late recurrent ischemia occurred in one-third of conservatively treated patients with a normal DET.
  • A significant proportion (30%) of patients with a normal DET in the conservative group underwent revascularization (PTCA/bypass) due to prognostic concerns.
  • One patient experienced reinfarction despite a normal predischarge exercise test.

Conclusions:

  • A normal predischarge exercise test provides limited prognostic value for identifying patients at risk of future ischemic events after AMI treated with thrombolysis.
  • The presence of viable myocardium at risk cannot be reliably excluded based solely on a normal DET.
  • Continuous monitoring and risk stratification remain essential for post-AMI patients, even with a seemingly negative exercise test.

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