PMID: 10338031May 25, 1999Paper

QRST integral analysis of body surface electrocardiographic mapping for assessing exercise-induced changes in the spatial distribution of local repolarization properties in patients with coronary artery disease and in patients with previous anterior infarction

Journal of Electrocardiology
H MiyakodaC Shigemasa

Abstract

We studied resting, postexercise, difference (postexercise - rest) QRST isointegral maps, and the correlation coefficient between resting and postexercise maps. Study I Fifteen controls and 48 patients without previous myocardial infarction were studied. In coronary syndrome X group (n = 14), no patients showed an abnormally negative area on the postexercise map. In coronary ST depression group (n = 26), 12 patients (46%) showed an abnormally negative area on the postexercise map, and the correlation coefficient was low. Although all control, syndrome X, and coronary ST depression patients showed the global-downward type of difference map, coronary ST elevation patients (n = 8) showed the right-downward and left-upward type, right-upward and left-downward type, or reversed saddle type. Coronary ST depression is related to a globally marked decrease in local repolarization forces. Coronary ST elevation is associated with multidirectional changes in local repolarization forces. Study II Fifty-one patients with previous anterior infarction (29 with residual ischemia and 22 without) were studied. The incidence of the global-positive type of maps was increased and that of the saddle-type map was decreased from rest to postexercise i...Continue Reading

References

Mar 1, 1992·Circulation·R O CannonS E Epstein
Feb 1, 1966·American Heart Journal·R E Mason, I Likar

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Citations

Mar 27, 2013·IEEE Transactions on Medical Imaging·Bjørn Fredrik NielsenPer Grøttum

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