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March 1, 1971Circulation

Significance of the Diagnostic Q Wave of Myocardial Infarction

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Why the study?

How accurate is the diagnostic Q wave on ECG for predicting myocardial infarction compared to postmortem ventricular anatomy?

Population

1184 instances of normal conduction with postmortem ventricular anatomy correlation

Comparison

Electrocardiographic analysis of Q waves vs Postmortem ventricular anatomy

Design

Cross-sectional

Authors

LHLeo G. HoranNFNancy C. FlowersJJJennifer Johnson

Discussion

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Overview

Caution against isolated anteroseptal or inferior Q waves for MI diagnosis; leaves open prospective validation of zone-specific ECG criteria.

Key Points

  • The aim is to evaluate the diagnostic significance of Q waves in identifying myocardial infarction.
  • Analyzed 1184 instances of normal conduction and the correlation of the QRS complex with postmortem ventricular anatomy.
  • Examined the reliability of Q wave presence in diagnosing myocardial infarction against various electrocardiographic zones.
  • Assessed the patterns of Q wave distribution in different anatomical regions of the left ventricle.
  • Correct diagnosis of infarction using the presence of Q wave was achieved in 79% of the cases.
  • Abnormal Q waves in the anteroseptal and inferior zones had a false prediction rate of 46%.
  • Abnormal Q waves confined to the lateral zone or in combination showed a false prediction rate of only 4%.

Structured PICO

How accurate is the diagnostic Q wave on ECG for predicting myocardial infarction compared to postmortem ventricular anatomy?

P
Population
1184 instances of normal conduction with postmortem ventricular anatomy correlation
I
Intervention
Electrocardiographic analysis of Q waves (duration > 0.03 sec and localization)
C
Comparator
Postmortem ventricular anatomy (reference standard)
O
Outcome
Diagnostic accuracy of Q waves for myocardial infarctionsurrogate

The diagnostic Q wave is a moderately reliable indicator of myocardial infarction, but its accuracy varies significantly by electrocardiographic zone, with isolated anteroseptal or inferior Q waves having a high false-positive rate.

Cite This Study

Horan et al. (1971) studied this question.

synapsesocial.com/papers/6a1205ab1dce72a77db4c4bchttps://doi.org/10.1161/01.cir.43.3.428
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