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Utilizing Percutaneous Ventricular Assist Devices in Acute Myocardial Infarction Complicated by Cardiogenic Shock
06:10

Utilizing Percutaneous Ventricular Assist Devices in Acute Myocardial Infarction Complicated by Cardiogenic Shock

Published on: June 12, 2021

Increased incidence of silent ischemia after acute myocardial infarction

G J Taylor1, R E Katholi, K Womack

  • 1Prairie Cardiovascular Center, Springfield, Ill.

JAMA
|September 16, 1992
PubMed

Insights

Patients receiving thrombolytic therapy for myocardial infarction experienced significantly less angina during induced ischemia compared to those with existing angina. This suggests silent ischemia is common after thrombolysis.

Area of Science:

  • Cardiology
  • Interventional Cardiology
  • Myocardial Infarction Research

Background:

  • Angina pectoris is a hallmark symptom of myocardial ischemia.
  • Thrombolytic therapy is a critical treatment for acute myocardial infarction (AMI).
  • The presence and severity of ischemia after AMI and thrombolysis require further investigation.

Purpose of the Study:

  • To compare the incidence of angina pectoris during induced myocardial ischemia.
  • To evaluate patients treated with thrombolytic therapy for AMI versus patients with pre-existing angina pectoris.
  • To assess ischemic responses and myocardial viability post-thrombolysis.

Main Methods:

  • A comparative study conducted at a tertiary cardiology referral center.
  • Twenty-five patients with angina pectoris and 30 patients 2 days post-thrombolytic therapy for AMI underwent percutaneous transluminal coronary angioplasty (PTCA).
  • Coronary artery occlusion was induced for 5 minutes using balloon dilatation during PTCA, with assessments via electrocardiograms and pulmonary artery wedge pressure.

Main Results:

  • Angina developed in 64% (16/25) of patients in the angina pectoris group during balloon occlusion.
  • In contrast, only 30% (9/30) of patients in the thrombolysis group reported angina during occlusion of the infarct artery (P < .01).
  • Electrocardiographic responses to ischemia and changes in pulmonary wedge pressure were comparable between the two groups.

Conclusions:

  • Patients undergoing thrombolytic therapy for myocardial infarction exhibit a lower incidence of angina during induced ischemia.
  • Silent myocardial ischemia appears to be prevalent in patients after thrombolytic treatment for AMI.
  • These findings highlight the potential for unrecognized ischemic events in the post-thrombolysis period.
Abstract

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