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[Ventricular arrhythmias and QT/QS2 index in patients with ischemic heart disease]

J Wodniecki1, J Foremny, B Bacior

  • 1I Klinika Kardiologii IK SL. AM w Katowicach.

Kardiologia Polska
|January 1, 1990
PubMed

Insights

The QT/QS2 index shows no close link to ventricular arrhythmia types in ischemic heart disease patients. However, abnormal QT/QS2 values may indicate a higher risk for ventricular tachycardia/fibrillation (VT/VF).

Area of Science:

  • Cardiology
  • Electrophysiology
  • Ischemic Heart Disease Research

Background:

  • Ischemic heart disease (IHD) is a significant cause of morbidity and mortality.
  • Ventricular arrhythmias, including ventricular tachycardia/fibrillation (VT/VF), are serious complications of IHD.
  • The QT/QS2 index is a potential marker for cardiac electrical instability.

Purpose of the Study:

  • To investigate the relationship between the QT/QS2 index and ventricular arrhythmia types in IHD patients.
  • To determine if the QT/QS2 index can predict the risk of VT/VF.

Main Methods:

  • A multicenter study involving 900 IHD patients.
  • Simultaneous electrocardiogram (ECG) and phonocardiogram registration to calculate the QT/QS2 index.
  • 24-hour Holter ECG monitoring to classify ventricular arrhythmias (Lown's classification).
  • Analysis of patients with a history of VT/VF.

Main Results:

  • No significant correlation was found between the QT/QS2 index and different Lown's arrhythmia classes.
  • The proportion of patients with abnormal QT/QS2 index values was similar across different arrhythmia classes.
  • Patients with a history of VT/VF showed a significantly higher frequency of increased QT/QS2 index (37%) compared to others (19%, p=0.016).

Conclusions:

  • The QT/QS2 index does not closely correlate with the specific type of ventricular arrhythmia detected by Holter monitoring.
  • Pathological QT/QS2 index values appear to be associated with an increased risk of VT/VF in IHD patients.
  • Further research may explore the utility of the QT/QS2 index as a risk stratification tool for VT/VF.

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