Papers Published

1. de Jongh, A.L. and Sheals, B.S. and Chau, D.K. and Hoffmeister, B.K. and Malkin, R.A., Left ventricular volume changes after defibrillation, Conference Proceedings. Second Joint EMBS-BMES Conference 2002. 24th Annual International Conference of the Engineering in Medicine and Biology Society. Annual Fall Meeting of the Biomedical Engineering Society (Cat. No.02CH37392), vol. vol.2 (2002), pp. 1438 vol.2 -, Houston, TX, USA [IEMBS.2002.1106470]
   (last updated on 2007/04/14)

   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;