In vivo measurement of swine endocardial convective heat transfer coefficient.
We measured the endocardial convective heat transfer coefficient h at 22 locations in the cardiac chambers of 15 pigs in vivo. A thin-film Pt catheter tip sensor in a Wheatstone-bridge circuit, similar to a hot wire/film anemometer, measured h. Using fluoroscopy, we could precisely locate the steerable catheter sensor tip and sensor orientation in pigs' cardiac chambers. With flows, h varies from 2500 to 9500 W/m2 x K. With zero flow, h is approximately 2400 W/m2 x K. These values of h can be used for the finite element method modeling of radiofrequency cardiac catheter ablation.
Department of Electrical Engineering, Chulalongkorn University, Bangkok, Thailand.
Chanchana
C
Tangwongsan
James A
JA
Will
John G
JG
Webster
Kenneth L
KL
Meredith
David M
DM
Mahvi
D000818:Animals; D017115:Catheter Ablation / Q000379:methods*; D003198:Computer Simulation; D004699:Endocardium / Q000502:physiology* / Q000528:radiation effects / Q000601:surgery*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008955:Models, Cardiovascular; D013552:Swine; D013814:Thermal Conductivity; D013817:Thermography / Q000295:instrumentation* / Q000379:methods; D014159:Transducers