Title :
Correlation between paced epimyocardial electrograms and stroke volume in heart transplants
Author :
Kastner, P. ; Schreier, G. ; Schaffellner, S. ; Grasser, B. ; Iberer, F. ; Tscheliessnigg, K.H. ; Schaldach, M. ; Hutten, H.
Author_Institution :
Inst. of Biomed. Eng., Tech. Univ. Graz, Austria
Abstract :
In 10 heart transplant patients different hemodynamic states have been forced by randomized changes of pacing rate (PR) and postural variations (overall 40, 4±1 per patient). Cardiac output assessed with thermodilution technique was compared to the ventricular evoked response (VER) recorded with telemetric pacemakers from epimyocardial leads. Linear regression analysis between the negative extremum during the depolarization phase of the VER (Ramp) and the stroke volume (SV=CO/PR) resulted in the equation: Ramp[%]=140-0.4*SV[%] with r=0.89 and p<0.00001. This result confirms previously reported results of a distinct relation between the negative extremum of paced epimyocardial ECGs and geometrical variations of the heart
Keywords :
electrocardiography; haemodynamics; pacemakers; surgery; cardiac output; depolarization phase; geometrical variations; graft rejection monitoring; heart transplants; hemodynamic states; linear regression analysis; negative extremum; paced epimyocardial electrograms; pacing rate; postural variations; randomized changes; stroke volume; telemetric pacemakers; thermodilution technique; ventricular evoked response; Aging; Biomedical engineering; Electrocardiography; Equations; Heart; Hemodynamics; Linear regression; Myocardium; Pacemakers; Telemetry;
Conference_Titel :
[Engineering in Medicine and Biology, 1999. 21st Annual Conference and the 1999 Annual Fall Meetring of the Biomedical Engineering Society] BMES/EMBS Conference, 1999. Proceedings of the First Joint
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-5674-8
DOI :
10.1109/IEMBS.1999.802245
