Changes of the beat amplitude power after partial left ventriculectomy and coronary artery bypass grafting.
Partial left ventriculectomy (PLV) was originally introduced as a new surgical approach by patients with an end stage of cardiac disease. Coronary artery bypass grafting (CABG) is a standard procedures used in cardiac surgery. Multichannel ECG (MECG) measurements and body surface mapping (BSM) were used to analyse the normalised beat amplitude power maps (BAM) that reflect an overall cardiac activity. The resulting BAMs show that the amplitude of cardiac signals decrease for approximately 30% after the PLV and stay in the same level during the postoperative monitoring interval while after CABG no significant changes in BAM have been observed. In addition the electrodes from the body surface area above the left ventricle, where surgery was performed, show significant changes in beat amplitudes.
Ujiie
Toshimi
T
Tokai University, Cardiovascular Surgery and Transplantation, Bohsedai Isehara, Kanagawa 259-1193, Japan. toujiie@attglobal.net
D000328:Adult; D018780:Body Surface Potential Mapping; D002648:Child; D003198:Computer Simulation; D001026:Coronary Artery Bypass; D006321:Heart / Q000502:physiology*; D006352:Heart Ventricles / Q000601:surgery*; D006801:Humans; D008875:Middle Aged; D008991:Monitoring, Physiologic; D011184:Postoperative Period; D012016:Reference Values; D012815:Signal Processing, Computer-Assisted