Does body surface potential mapping (bspm) predict functional recovery in chronic ischemic myocardium after revascularization?

Irreversibly dysfunctional myocardium is electrically characterized by decreased amplitudes and prolonged duration of local electrograms. We investigated whether ECGs from body surface correlate with epicardial electrograms. A 120-channel body surface potential mapping (BSPM) was performed in 24 patients before CABG. During CABG epicardial mapping was performed. For all BSPM leads the Q-amplitude and QR-duration were measured and correlated to epicardial electrogram characteristics. Q-wave-amplitude neighboring the area over the left scapula correlated well with epicardial amplitudes in scarred LAD. QR-duration caudal to V5,V6 correlated well with epicardial signal duration in scarred CxA, Q-amplitude in paramedian epigastric region correlated with epicardial amplitudes in scarred RCA. Epicardial electrogram characteristics can be estimated from body surface in patients with chronic ischemia