Pulse wave transit time measurement of cardiac output showed a 96.0% concordance rate (lower 95% CI 64%) with thermodilution for trending during partial hepatectomy, with wide limits of agreement.
Observational (n=31)
Non-blinded
Does the pulse wave transit time method accurately trend with thermodilution for measuring cardiac output in patients undergoing partial hepatectomy?
The pulse wave transit time method shows good concordance but wide limits of agreement compared to thermodilution for trending cardiac output during partial hepatectomy.
BACKGROUND: Measuring cardiac output accurately during anesthesia is thought to be helpful for safely controlling hemodynamics. Several minimally invasive methods to measure cardiac output have been developed as alternatives to thermodilution with pulmonary artery catheterization. We evaluated the reliability of a novel pulse wave transit time method of cardiac output assessment to trend with thermodilution cardiac output in patients undergoing partial hepatectomy. METHODS: Thirty-one patients (ASA physical status II or III) undergoing partial hepatectomy under general anesthesia were evaluated. Cardiac output measurements by pulse wave transit time method and by thermodilution were recorded after induction of anesthesia, after a change in body positioning to 20° head up, after a change to 20° head down, after volume challenge with 10 mL·kg hydroxyethyl starch 6%, during the Pringle maneuver, and immediately after Pringle maneuver release. Trending was assessed using Bland-Altman analysis and concordance analysis. RESULTS: The direction of change between consecutive pulse wave transit time measurements and the corresponding thermodilution measurements showed a concordance rate of 96.0% (lower 95% confidence interval = 64%), with limits of agreement -1.51 and 1.61 L·min. CONCLUSIONS: The pulse wave transit time method had good concordance but fairly wide limits of agreement with regard to trending in patients with changes in preload and systemic vascular resistance. There are potential inaccuracies when vasopressors are used to treat hypotension associated with decreased systemic vascular resistance. The study limitations are that the cardiac output data were collected in a nonblinded fashion, and an existing intraarterial catheter was used, although the system requires only routine, noninvasive cardiovascular monitors. This is a promising technique that currently has limitations and will require further improvements and clinical assessment.
Tsutsui et al. (Thu,) conducted a observational in Partial Hepatectomy (n=31). Pulse wave transit time method of cardiac output assessment vs. Thermodilution with pulmonary artery catheterization was evaluated on Concordance rate of the direction of change between consecutive measurements (95% CI lower limit 64). Pulse wave transit time measurement of cardiac output showed a 96.0% concordance rate (lower 95% CI 64%) with thermodilution for trending during partial hepatectomy, with wide limits of agreement.