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Prolonged myocardial stunning after thrombolysis: can left ventricular function be assessed definitely at hospital

M Pfisterer1, M Zuber, R Wenzel

  • 1Division of Cardiology, University Hospital, Basel, Switzerland.

European Heart Journal
|February 1, 1991
PubMed

Insights

Myocardial stunning, or dysfunction after reperfusion, can show delayed recovery. Left ventricular ejection fraction may improve significantly over several months, especially with early reperfusion.

Area of Science:

  • Cardiology
  • Cardiovascular Medicine
  • Interventional Cardiology

Background:

  • Acute myocardial infarction requires timely reperfusion to restore blood flow.
  • Myocardial stunning is a transient dysfunction following reperfusion.
  • The potential for delayed recovery of left ventricular function after reperfusion is not fully understood.

Purpose of the Study:

  • To assess the delayed recovery of myocardial function after acute reperfusion.
  • To determine if left ventricular ejection fraction (LVEF) improves beyond the acute phase.
  • To identify factors influencing delayed functional recovery.

Main Methods:

  • Utilized radionuclide angiocardiography to assess LVEF in 33 patients from the European Cooperative Study (rtPA vs placebo).
  • Evaluated LVEF on day 9 and again at 3-6 months post-reperfusion.
  • Correlated LVEF changes with early reperfusion markers (peak creatine kinase time) and infarct-related artery patency.

Main Results:

  • Seventeen patients with depressed LVEF on day 9 showed significant improvement by 3-6 months (38.8% to 45.2%, P < 0.01).
  • Delayed recovery was observed primarily in patients with early reperfusion (peak CK ≤ 15h) and open infarct-related arteries.
  • Patients without early reperfusion or with persistent arterial occlusion did not show significant LVEF improvement.

Conclusions:

  • Depressed left ventricular ejection fraction after reperfusion may exhibit delayed recovery due to prolonged myocardial stunning.
  • Left ventricular function assessment immediately after hospital discharge may not be definitive.
  • Thrombolysis outcomes require cautious interpretation, considering the potential for delayed functional improvement.

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