Valium Research Today is a free monthly online journal that collates and summarizes the latest research about Valium, including details on diazepam, depression, side-effects, withdrawal.

Effects of vasodilation on cardiac output measured by PulseCO.

Yamashita K, Nishiyama T, Yokoyama T, Abe H, Manabe M

Department of Anesthesiology and Critical Care Medicine, Kochi Medical School, Kohasu, Oko-cho, Nankoku-shi, Kochi, 783-8505, Japan. koichiya@kochi-u.ac.jp

BACKGROUNDS: The instability of cardiac output (CO) measured by PulseCO (LiDCO Ltd.) during cardiac surgery has been reported. In the present study, we investigated the effects of vasodilation by prostaglandin E1 (PGE1) on the relation between cardiac output measured by PulseCO and that by thermodilution. METHODS: Twenty patients who underwent off-pump coronary artery bypass grafting (OPCAB) were enrolled in this study. After premedication with oral diazepam 10 mg, anesthesia was induced with midazolam, fentanyl and vecuronium. CO was measured after anesthesia induction, at PGE1 0.01, 0.02 and 0.04 microg/(kg min) and at 15 min after the stop of the infusion. RESULTS: Systemic vascular resistances (SVRs) by PGE1 at 0.02 and 0.04 microg/(kg min) were significantly lower than the control value. The correlation coefficient (R2) between the two techniques at each point, percentage error and limits of agreement (bias +/-2SD of bias) were 0.78, 3, 0.05 +/- 0.17 at 0.01 microg/(kg min), 0.20, 10, -0.18 +/- 0.12 at 0.02 microg/(kg min), 0.46, 28, -0.50 +/- 0.24 at 0.04 microg/(kg min) and 0.97, 1, 0.02 +/- 0.27 L/min at 15 min after stop of infusion, respectively. CONCLUSION: PulseCO might underestimate CO compared to that by bolus thermodilution method when simply decreasing the SVR by infusion of PGE1. Therefore, PulseCO might be unsuitable in cardiac surgery.

Published 8 November 2007 in J Clin Monit Comput, 21(6): 335-9.
Full-text of this article is available online (may require subscription).

© 2004-2008 Valium Research Today. All Rights Reserved.