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Year 2019

Volume: 6 , Issue: 3

Print ISSN:-2394-4781

Online ISSN:-2394-4994

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Indian Journal of Clinical Anaesthesia

Comparison of cardiac output using invasive (Pulmonary Artery catheter Continuous cardiac Output), less invasive (FloTrac) and non invasive (Pulse Wave Transit Time) methods in patients undergoing off pump coronary artery bypass grafting

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Article Type : Research Article

Author Details: Yogesh N Zanwar,Jubin T. J*,V R Shrotey

Volume : 6

Issue : 3

Online ISSN : 2394-4994

Print ISSN : 2394-4781

Article First Page : 371

Article End Page : 376


Aim and Objective: This study was undertaken in patients undergoing off-pump coronary artery bypass grafting (OPCABG) with aim of comparing cardiac output using invasive pulmonary artery catheter continuous cardiac output (PAC CCO), less invasive (FloTrac pulse contour based) and non invasive pulse wave transit time (PWTT) methods.
Materials and Methods: Longitudinal observational study carried out in the department of Anesthesiology (CVTS OT) of super speciality hospital tertiary care hospital run by state Government with total 995 data sets taken from 25 subjects undergoing off pump coronary artery bypass grafting. Swan Ganz pulmonary artery catheter was inserted through the right internal jugular vein through introducer sheath and attached to the Edward vigilance II continuous cardiac output monitor for continuous monitoring of cardiac output invasively. Similarly cardiac output was measured with less invasive (FloTrac) monitor attached to a dedicated left femoral artery line. Non invasive (Estimated Continuous cardiac output (esCCO) based on pulse wave transit time) monitor attached to ECG and Spo2 probe sensor & calibration done with non –invasive blood pressure (NIBP) and the required demographic characteristics entered.
Results: Mean cardiac output assessed by invasive, less invasive and non invasive method was 3.91+/-0.87, 5.71+/-0.87 and 6.03 +/- 0.99 L/min respectively. There was poor correlation between less invasive and the invasive with r=0.25 and also poor correlation between non-invasive and invasive with correlation coefficient of r=0.27. Both less invasive (FloTrac) and non invasive methods (PWTT) showed higher estimation when compared to the invasive (PAC CCO). The Bland Altman analysis showed poor agreement between less invasive (FloTtrac) and the invasive (PAC CCO) method, whereas the non invasive (PWTT based esCCO) showed good agreement. Percentage error were 68% and 126% for non-invasive (PWTT based es CCO) and less invasive (FloTrac) respectively.
Conclusion: Cardiac output assessed with less-invasive method & non invasive method showed higher as well as lower estimates Both less and non invasive methods of cardiac estimation showed poor correlation with invasive method. Utilizing the current algorithms produces an unacceptable degree of error and its utility is doubtful for clinical/therapeutic decision making in patients undergoing off pump coronary artery bypass grafting.

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