Clinical study
Myocardial viability assessment by endocardial electroanatomic mapping: comparison with metabolic imaging and functional recovery after coronary revascularization

https://doi.org/10.1016/S0735-1097(01)01314-6Get rights and content
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Abstract

OBJECTIVES

The objective of this study was to compare electroanatomic mapping for the assessment of myocardial viability with nuclear metabolic imaging using positron emission computed tomography (PET) and with data on functional recovery after successful myocardial revascularization.

BACKGROUND

Animal experiments and first clinical studies suggested that electroanatomic endocardial mapping identifies the presence and absence of myocardial viability.

METHODS

Forty-six patients with prior (≥2 weeks) myocardial infarction underwent fluorine-18 fluorodeoxyglucose (FDG) PET and Tc-99m sestamibi single-photon emission computed tomography (SPECT) before mapping and percutaneous coronary revascularization. The left ventricular endocardium was mapped and divided into 12 regions, which were assigned to corresponding nuclear regions. Functional recovery using the centerline method was assessed in 25 patients with a follow-up angiography.

RESULTS

Regional unipolar electrogram amplitude was 11.0 mV ± 3.6 mV in regions with normal perfusion, 9.0 mV ± 2.8 mV in regions with reduced perfusion and preserved FDG-uptake and 6.5 mV ± 2.6 mV in scar regions (p < 0.001 for all comparisons). At a threshold amplitude of 7.5 mV, the sensitivity and specificity for detecting viable (by PET/SPECT) myocardium were 77% and 75%, respectively. In infarct areas with electrogram amplitudes >7.5 mV, improvement of regional wall motion (RWM) from −2.4 SD/chord ± 1.0 SD/chord to −1.5 SD/chord ± 1.1 SD/chord (p < 0.01) was observed, whereas, in infarct areas with amplitudes <7.5 mV, RWM remained unchanged at follow-up (−2.3 SD/chord ± 0.7 SD/chord to −2.4 SD/chord ± 0.7 SD/chord).

CONCLUSIONS

These data suggest that the regional unipolar electrogram amplitude is a marker for myocardial viability and that electroanatomic mapping can be used for viability assessment in the catheterization laboratory.

Abbreviations

AUC
area under the curve
CI
confidence interval
FDG
F-18 fluorodeoxyglucose
LAD
left anterior descending artery
LCX
left circumflex artery
LV
left ventricle or left ventricular
MI
myocardial infarction
PET
positron emission computed tomography
PTCA
percutaneous transluminal coronary angioplasty
RCA
right coronary artery
ROC
receiver operator curve
RWM
regional wall motion
SPECT
single photon emission computed tomography

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