ORIGINAL ARTICLE
Year : 2010  |  Volume : 4  |  Issue : 2  |  Page : 63-67

Mixed venous versus central venous oxygen saturation in patients undergoing on pump beating coronary artery bypass grafting


1 Cardiac Anesthesia Division, King Fahad Cardiac Center, Riyadh, Saudi Arabia
2 Consultant Cardiac Anaesthesia, King Fahad Military Medical Complex, Dhahran, Saudi Arabia
3 Department of Anaesthesia, King Khalid University Hospital, King Saud University, Riyadh, Saudi Arabia
4 Anesthesia Department, King Fahad Military Medical Complex, Dhahran, Saudi Arabia
5 Anaesthesia Department, Ain Shams University, Cairo, Egypt
6 Consultant Cardiac Anaesthesia, King Fahad National Guard Hospital, Riyadh, Saudi Arabia
7 Cardiac Surgery Division, King Fahad Cardiac Center, King Saud University, Riyadh, Saudi Arabia
8 Department of Surgery, King Saud University, Riyadh, Saudi Arabia

Correspondence Address:
Ahmad Alshaer
Assistant Professor and Consultant of Cardiac Anesthesia, King Fahad Cardiac Center, College of medicine, King Saud University, Riyadh
Saudi Arabia
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/1658-354X.65129

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Objective: To examine the validity of central venous oxygen saturation (ScvO 2 ) as a numerical substitution of mixed venous oxygen saturation (SvO 2 ) in adult patients undergoing normothermic on pump beating coronary artery bypass grafting (CABG). Materials and Methods: Prospective clinical observational study was done at King Khalid University Hospital, King Saud University, Riyadh, Kingdom of Saudi Arabia. Thirty four adult patients scheduled for coronary artery surgery were included. Patients were monitored by a pulmonary artery catheter (PAC) as a part of our routine intraoperative monitoring. SvO 2 and ScvO 2 were simultaneously measured 15 minutes (T1) and 30 minutes (T2) after induction of anesthesia, 15 and 30 minutes after initiation of cardiopulmonary bypass (T3 and T4), and 15 and 30 minutes after admission to intensive care unit (T5 and T6). Results: ScvO 2 showed higher reading than SvO 2 all through our study. Our results showed perfect positive statistically significant correlation between SvO 2 and ScvO 2 at all data points. Individual mean of difference (MOD) between both the readings at study time showed MOD of 1.34 and 1.44 at T1 and T2 simultaneously. This MOD was statistically insignificant, but after on pump beating normothermic bypass was initiated; MOD was 5.2 and 4.4 at T3 and T4 with high statistical significance. In ICU, MOD continues to have high statistical significance, MOD was 6.3 at T5 and at T6 it was 4.6. Conclusions: In on pump beating CABG patients; ScvO 2 and SvO 2 are not interchangeable numerically. ScvO 2 is useful in the meaning of trend; our data suggest that ScvO 2 is equivalent to SvO 2 , only in the course of clinical decisions as long as absolute values are not required.


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