Title :
Left ventricular volume changes after defibrillation
Author :
de Jongh, A.L. ; Sheals, B.S. ; Chau, D.K. ; Hoffmeister, B.K. ; Malkin, R.A.
Author_Institution :
Joint Graduate Program in Biomed. Eng., Univ. of Memphis, TN, USA
Abstract :
A previous study has shown that the cross-sectional area of the left ventricular cavity (LV) increases immediately after defibrillation, suggesting that the defibrillation shock may cause relaxation. Since a single area slice may not reflect the entire myocardium, we wanted to test the relaxation hypothesis by evaluating volume. Ten to twenty defibrillation shocks were delivered in each of six dogs. A catheter was placed in the LV to measure intraventricular volume (IVV). Ultrasound images of the LV were recorded simultaneously with IVV. LV cavity area increased 13% (p<0.001) and IVV increased 4% (p<0.001) post-shock. Our results confirm that the heart is relaxing after defibrillation.
Keywords :
bioelectric potentials; biomechanics; biomedical ultrasonics; cardiology; catheters; defibrillators; muscle; volume measurement; cardiac mechanics; catheter; cross-sectional area; defibrillation; defibrillation shock; intraventricular volume; left ventricular blood volume; left ventricular cavity; left ventricular volume changes; myocardium; post-shock; relaxation; single area slice; ultrasound images; Catheters; Defibrillation; Dogs; Electric shock; Myocardium; Testing; Ultrasonic imaging; Ultrasonic variables measurement; Volume measurement; Volume relaxation;
Conference_Titel :
Engineering in Medicine and Biology, 2002. 24th Annual Conference and the Annual Fall Meeting of the Biomedical Engineering Society EMBS/BMES Conference, 2002. Proceedings of the Second Joint
Print_ISBN :
0-7803-7612-9
DOI :
10.1109/IEMBS.2002.1106470
