Significance of the Diagnostic Q Wave of Myocardial Infarction

Q: What does this research mean for the field?

While a Q wave greater than 0.03 seconds correctly diagnoses myocardial infarction in 79% of cases, abnormal Q waves isolated to the anteroseptal or inferior zones are frequently false predictors (46%), whereas those restricted to the lateral zone or multiple zones are highly reliable. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

Leo G. Horan; Nancy C. Flowers; Jennifer Johnson

doi:10.1161/01.cir.43.3.428

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?

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

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Implication

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.

Abstract

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Cite This Study

Horan et al. (1971) studied this question.

synapsesocial.com/papers/6a1205ab1dce72a77db4c4bc https://doi.org/10.1161/01.cir.43.3.428

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Significance of the Diagnostic Q Wave of Myocardial Infarction

Key Points

Structured PICO

Ask about this paper

Implication

Abstract

Discussion

Cite This Study

Significance of the Diagnostic Q Wave of Myocardial Infarction

Key Points

Structured PICO

Ask about this paper

Implication

Abstract

Discussion

Cite This Study

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