%0 Journal Article
%T Comparison of transthoracic electrical bioimpedance cardiac output measurement with thermodilution method in post coronary artery bypass graft patients
%A Sharma Vikas
%A Singh Ajmer
%A Kansara Bhuvnesh
%A Karlekar Anil
%J Annals of Cardiac Anaesthesia
%D 2011
%I Medknow Publications
%X Transthoracic electrical bioimpedance (TEB) has been proposed as a non-invasive, continuous, and cost-effective method of cardiac output (CO) measurement. In this prospective, non-randomized, clinical study, we measured CO with NICOMON (Larsen and Toubro Ltd., Mysore, India) and compared it with thermodilution (TD) method in patients after off-pump coronary artery bypass (OPCAB) graft surgery. We also evaluated the effect of ventilation (mechanical and spontaneous) on the measurement of CO by the two methods. Forty-six post-OPCAB patients were studied at five predefined time points during controlled ventilation and at five time points when breathing spontaneously. A total of 230 data pairs of CO were obtained. During controlled ventilation, TD CO values ranged from 2.29 to 6.74 L/min (mean 4.45 ¡À 0.85 L/min), while TEB CO values ranged from 1.70 to 6.90 L/min (mean 4.43 ¡À 0.94 L/min). The average correlation (r) was 0.548 (P = 0.0002), accompanied by a bias of 0.015 L/min and precision of 0.859 L/min. In spontaneously breathing patients, TD CO values ranged from 2.66 to 6.92 L/min (mean 4.66 ¡À 0.76 L/min), while TEB CO values ranged from 3.08 to 6.90 L/min (mean 4.72 ¡À 0.82 L/min). Their average correlation was relatively poor (r = 0.469, P= 0.002), accompanied by a bias of  0.059 L/min and precision of 0.818 L/min. The overall percent errors between TD CO and TEB CO were 19.3% (during controlled ventilation) and 17.4% (during spontaneous breathing), respectively. To conclude, a fair correlation was found between TD CO and TEB CO measurements among post-OPCAB patients during controlled ventilation. However, the correlation was weak in spontaneously breathing patients.
%K Cardiac output
%K off-pump coronary artery bypass graft surgery
%K thermodilution
%K transthoracic electrical bioimpedance
%U http://www.annals.in/article.asp?issn=0971-9784;year=2011;volume=14;issue=2;spage=104;epage=110;aulast=Sharma