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Updated: Aug 5, 2026

A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
18:11

A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis

Published on: December 28, 2012

[Angina-induced marked, positive U-waves in leads V1-3]

János Tomcsányi1, Tamás Frész1, Marcell Csákányi1

  • 11 Betegápoló Irgalmasrend Budai Irgalmasrendi Kórháza, Kardiológia Budapest, Árpád fejedelem u. 7. II. em., 1023 Magyarország.

Orvosi Hetilap
|August 2, 2026
PubMed

Insights

U-wave polarity changes during angina can indicate myocardial ischemia, potentially being the sole sign. Positive U-waves in leads V1-4 during angina suggest posterobasal ischemia and critical coronary artery stenosis.

Area of Science:

  • Cardiology
  • Electrocardiography
  • Ischemic Heart Disease

Background:

  • U-wave changes during angina are frequently overlooked.
  • Altered U-wave polarity can be the only indicator of myocardial ischemia.

Purpose of the Study:

  • To highlight the significance of U-wave polarity changes in diagnosing myocardial ischemia.
  • To correlate specific U-wave changes with coronary artery stenosis.

Main Methods:

  • Case study presentation.
  • Electrocardiographic analysis during angina episodes.

Main Results:

  • Positive U-wave in leads V1-4 during angina indicates posterobasal ischemia.
  • This finding suggests critical stenosis in the circumflex (CX) or right coronary artery (RCA).

Conclusions:

  • U-wave polarity changes are a crucial, often unrecognized, sign of myocardial ischemia.
  • Monitoring U-waves can aid in identifying critical coronary artery lesions.

Keywords:
U-hullámU-waveacute coronary syndromeakut coronaria szindrómamyocardial ischemiamyocardialis ischaemia

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