Title :
In vivo measurement of swine endocardial convective heat transfer coefficient
Author :
Tangwongsan, Chanchana ; Will, James A. ; Webster, John G. ; Meredith, Kenneth L., Jr. ; Mahvi, David M.
Author_Institution :
Dept. of Electr. Eng., Chulalongkorn Univ., Bangkok, Thailand
Abstract :
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 Wheatstonebridge 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·K. With zero flow, h is approximately 2400 W/m2·K. These values of h can be used for the finite element method modeling of radiofrequency cardiac catheter ablation.
Keywords :
biothermics; cardiology; catheters; convection; diagnostic radiography; Wheatstonebridge circuit; finite element method; fluoroscopy; in vivo measurement; pig cardiac chambers; radiofrequency cardiac catheter ablation; sensor orientation; swine endocardial convective heat transfer coefficient; thin-film Pt catheter tip sensor; Biomedical measurements; Blood flow; Catheters; Finite element methods; Fluid flow measurement; Heart; Heat transfer; In vivo; Radio frequency; Thin film sensors; Animals; Catheter Ablation; Computer Simulation; Endocardium; Equipment Design; Equipment Failure Analysis; Models, Cardiovascular; Swine; Thermal Conductivity; Thermography; Transducers;
Journal_Title :
Biomedical Engineering, IEEE Transactions on
DOI :
10.1109/TBME.2004.828035
