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Clin Cardiol. 2008 Aug;31(8):372-7. doi: 10.1002/clc.20244.

Lack of pathologic Q waves: a specific marker of viability in myocardial hibernation.

Author information

1
Department of Cardiology, The Methodist Hospital, Houston, Texas, USA.

Abstract

BACKGROUND:

The present study evaluates the lack of Q waves on the electrocardiogram (ECG) in the prediction of myocardial viability compared with dobutamine stress echocardiography (DSE) and rest-redistribution thallium-201 (Tl-201) scintigraphy.

HYPOTHESIS:

The lack of pathologic Q waves (NoQ) may be a readily available and specific marker for the presence of viability.

METHODS:

Sixty four patients with stable coronary artery disease (CAD) and ventricular dysfunction underwent rest ECG, DSE, and Tl-201 scintigraphy before revascularization, and a repeat rest 2-Dimensional (2-D) echocardiogram more than 3 mo later.

RESULTS:

Total viability at baseline (% of total segments) was higher in the NoQ group by Tl-201 scintigraphy (87 +/- 19% versus 70 +/- 20%, p = 0.008) and by DSE (81 +/- 20% versus 65 +/- 24%, p = 0.013). As expected, the sensitivity of NoQ waves was low in predicting recovery of function (23%), and inferior to Tl-201 (82%) and DSE (84%) (p<0.08). However, specificity of NoQ waves for predicting recovery of global function was high (72%); higher than Tl-201 (50%) and DSE (45%). Positive predictive values were comparable among all modalities. Results were similar if the data were analyzed regionally for viability.

CONCLUSION:

Lack of pathologic Q waves is a specific and readily available marker of myocardial viability in patients with chronic CAD, which should alert the clinician for myocardial hibernation.

PMID:
18727077
PMCID:
PMC6653412
DOI:
10.1002/clc.20244
[Indexed for MEDLINE]
Free PMC Article

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