Key result
Inspiratory Q-wave changes fail to predict coronary artery disease.
Why the study?
The clinical significance of lead III Q waves and the effect of deep inspiration on these Q waves in relation to coronary artery disease and asynergy were unclear.
Does deep inspiration alter the clinical significance of lead III Q waves for predicting coronary artery disease and asynergy in patients undergoing cardiac catheterization?
Population
31 patients undergoing cardiac catheterization
Comparison
Deep inspiration vs baseline respiration effects on Q waves
Design
Observational study
Authors
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Respiration-induced Q-wave changes should not guide CAD diagnosis in leads III/aVF; challenges prior assumptions and leaves open refined ECG criteria.
Observational (n=31)
Does deep inspiration alter the clinical significance of lead III Q waves for predicting coronary artery disease and asynergy in patients undergoing cardiac catheterization?
Deep inspiration alters Q-wave duration in leads III and aVF regardless of underlying coronary artery disease, indicating it has no clinical value for predicting CAD or asynergy.
Monty Bodenheimer (1977) conducted an observational in Coronary artery disease (n=31). Deep inspiration was evaluated on Q-wave duration in leads III and aVF. Deep inspiration significantly altered Q-wave duration in leads III and aVF regardless of coronary artery disease presence, demonstrating no clinical value for predicting disease.
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