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Late reperfusion (6-24 hours after onset) improves left ventricular function in patients with acute myocardial

S Miyamoto1, Y Goto, M Fujita

  • 1Division of Cardiology, Takeda Hospital, Kyoto, Japan.

Japanese Circulation Journal
|May 12, 2001
PubMed

Insights

Late reperfusion therapy for acute myocardial infarction (AMI) improves heart function if the infarct-related artery remains open. This study shows high artery patency significantly enhances left ventricular function in AMI patients.

Area of Science:

  • Cardiology
  • Interventional Cardiology
  • Clinical Trials

Background:

  • Previous trials like TAMI-6 suggested late reperfusion (>6h) in acute myocardial infarction (AMI) does not improve chronic left ventricular (LV) function.
  • A low infarct-related artery (IRA) patency rate in prior studies prompted a new hypothesis: higher patency might alter outcomes.

Purpose of the Study:

  • To investigate if late reperfusion with a high IRA patency rate improves chronic LV function in AMI patients.
  • To evaluate the impact of successful late reperfusion on global and regional LV function post-AMI.

Main Methods:

  • A randomized controlled trial involving 44 AMI patients presenting 6-24h after symptom onset with total IRA occlusion.
  • Patients were assigned to either a late reperfusion group (n=22) or a non-reperfusion group (n=22).
  • Coronary angiography assessed IRA patency; echocardiography measured LV function (ejection fraction, regional shortening).

Main Results:

  • The initial reperfusion success rate in the late reperfusion group was 86%, with a chronic IRA patency rate of 91%.
  • Significant improvements in ejection fraction and infarct region chord shortening were observed from the acute to chronic phase in the late reperfusion group compared to the non-reperfusion group.
  • Late reperfusion was associated with enhanced LV global and regional function.

Conclusions:

  • Late reperfusion of the IRA in AMI patients, when achieved with a high patency rate, significantly improves chronic left ventricular function.
  • Achieving and maintaining IRA patency is crucial for beneficial outcomes in late reperfusion therapy for AMI.

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