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Electrocardiographic repolarization abnormalities in subarachnoid hemorrhage.

Claire E Sommargren1, Jonathan G Zaroff, Nader Banki

  • 1Department of Physiological Nursing, University of California, San Francisco, USA. sommargren@att.net

Journal of Electrocardiology
|January 23, 2003
PubMed
Summary

Electrocardiographic repolarization abnormalities are common in subarachnoid hemorrhage (SAH) patients. A prolonged QTc interval in SAH is linked to myocardial injury but not mortality.

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Area of Science:

  • Cardiology
  • Neurology

Background:

  • Electrocardiographic (ECG) abnormalities, especially concerning ventricular repolarization, are documented in subarachnoid hemorrhage (SAH).
  • Initial ECG findings in 100 SAH patients were analyzed.

Purpose of the Study:

  • To investigate the prevalence and significance of ECG abnormalities in patients with SAH.
  • To determine the association between ECG findings, myocardial injury, and mortality.

Main Methods:

  • Analysis of initial electrocardiograms in 100 SAH patients.
  • Assessment of repolarization abnormalities including QTc interval, ST segments, T waves, and U waves.
  • Measurement of serum cardiac troponin I levels and correlation with ECG findings and mortality.

Main Results:

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  • 41% of SAH patients exhibited one or more repolarization abnormalities.
  • Prolonged QTc interval (>460 ms) occurred in 16%, ST elevation in 9%, ST depression in 3%, T wave inversion in 7%, and prominent U waves in 15%.
  • Elevated cardiac troponin I was observed in 21% and significantly associated with prolonged QTc interval (5.5 times more likely). Left ventricular hypertrophy criteria were met in 14% without prior hypertension.

Conclusions:

  • Repolarization abnormalities are frequent in SAH patients.
  • Prolonged QTc interval in SAH is significantly associated with myocardial injury but not mortality.
  • ST-T wave abnormalities showed no correlation with myocardial injury or mortality.