F. Boudik et al., EVALUATION OF BODY-SURFACE POTENTIAL MAPPING CHANGES AFTER SUCCESSFULPERCUTANEOUS TRANSLUMINAL CORONARY ANGIOPLASTY, Canadian journal of cardiology, 12(8), 1996, pp. 745-749
OBJECTIVE: To assess the progress of chronic myocardial ischemia after
successful, percutaneous transluminal coronary angioplasty (PTCA) usi
ng body surface potential mapping (BSPM). DESIGN: For BSPM analysis th
e following kings of maps were used: isopotential repolarization maps
corresponding to 70% of ST-T interval's duration and isointegral maps
corresponding to 0% to 20% of ST-T duration. BSPM measurements were ta
ken before the PTCA and usually one to six days after this interventio
n. In 17 patients BSPM was carried out within two days after PTCA. Ele
ven to 14 BSPM examinations were usually carried out during six months
of follow-up. Control coronary angiography was performed after six mo
nths in all but three patients. RESULTS: Substantial focal decrease of
positive potential in repolarization caused by myocardial ischemia re
covered gradually after successful PTCA. This appeared to be caused by
the regression of 'hibernating myocardium'. An increase of positive p
otential was statistically significant (P<0.01) after the fifth week o
f PTCA intervention. There was a positive correlation between BSPM fin
dings and chest discomfort of patients after PTCA. Chronic myocardial
ischemia could be observed on isopotential and/or isointegral maps exa
mined before the PTCA in 21 of 25 cases (sensitivity 84%).