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Related Experiment Videos

Progressive decrease in myocardial ischemia assessed by intracoronary electrocardiogram during successive and

R Koning1, A Cribier, L Korsatz

  • 1Service de Cardiologie, Hôpital Charles Nicolle, Centre Hospitalo-Universitaire, Rouen, France.

American Heart Journal
|January 1, 1993
PubMed
Summary

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During coronary angioplasty, successive balloon inflations show a reduced myocardial ischemic response. Intracoronary ECG monitoring confirms this, revealing decreased chest pain and ECG changes with repeated occlusions.

Area of Science:

  • Cardiovascular Medicine
  • Interventional Cardiology
  • Electrophysiology

Background:

  • Coronary angioplasty involves balloon inflations to open blocked arteries.
  • Patients often report reduced chest pain and less pronounced ECG changes with repeated inflations.
  • This suggests a potential decrease in the heart muscle's (myocardial) response to ischemia.

Purpose of the Study:

  • To investigate the hypothesis of a decreasing myocardial ischemic response during successive balloon inflations.
  • To compare the sensitivity of intracoronary ECG versus surface ECG in detecting myocardial ischemia.

Main Methods:

  • 19 patients with left anterior descending artery stenosis underwent 4 prolonged (≥120s) balloon inflations.
  • Intracoronary and surface ECGs were continuously recorded, analyzing ST-segment elevation.

Related Experiment Videos

  • ST area and T wave amplitude were measured on intracoronary ECGs; chest pain was also recorded.

    • Main Results:

    • Intracoronary ECG detected ischemia more effectively than surface ECG across all inflations.
    • A significantly smaller increase in ST-segment elevation was observed with each successive inflation on intracoronary ECG.
    • Chest pain and ST area/T wave amplitude changes showed a progressive decrease, particularly by the fourth inflation.

    Conclusions:

    • A progressive decrease in myocardial ischemic response occurs during successive, prolonged balloon occlusions in coronary angioplasty.
    • Intracoronary ECG is superior to surface ECG for monitoring ischemia during these procedures.
    • Findings support the concept of myocardial stunning or adaptation during repeated ischemic episodes.