Background Elevation of systemic oxygen delivery and consumptionhas been associated with an improved outcome in critically illpatients. We conducted a randomized trial to determine whetherboosting oxygen delivery by infusing the inotropic agent dobutaminewould improve the outcome in a diverse group of such patients.
Methods On the basis of previously published recommendations,we established the following goals: a cardiac index above 4.5liters per minute per square meter of body-surface area, oxygendelivery above 600 ml per minute per square meter, and oxygenconsumption above 170 ml per minute per square meter. If thesegoals were not achieved with volume expansion alone, patientswere randomly assigned to a treatment or control group. Thetreatment group received intravenous dobutamine (5 to 200 µgper kilogram of body weight per minute) until all three goalshad been achieved. Dobutamine was administered to the controlgroup only if the cardiac index was below 2.8 liters per minuteper square meter.
Results A total of 109 patients were studied. In nine patientsthe therapeutic goals were achieved with volume expansion alone;all nine patients survived to leave the hospital. Fifty patientswere randomly assigned to the treatment group, and 50 to thecontrol group. During treatment, there were no differences betweenthe two groups in mean arterial pressure or oxygen consumption,despite a significantly higher cardiac index and level of oxygendelivery in the treatment group (P<0.05). Although the predictedrisk of death during hospitalization was 34 percent for bothgroups, the in-hospital mortality was lower in the control group(34 percent) than in the treatment group (54 percent) (P = 0.04;95 percent confidence interval, 0.9 to 39.1 percent).
Conclusions The use of dobutamine to boost the cardiac indexand systemic oxygen delivery failed to improve the outcome inthis heterogeneous group of critically ill patients. Contraryto what might have been expected, our results suggest that insome cases aggressive efforts to increase oxygen consumptionmay have been detrimental. .
Source Information
From the Departments of Anesthesia and Intensive Care, St. Bartholomew's Hospitals at Smithfield and Homerton (M.A.H., A.C.T., E.H.S.Y., C.J.H., D.W.), and the Departments of Anesthesia and Intensive Care, Charing Cross Hospital (M.P.) -- all in London.
Address reprint requests to Dr. Watson at the Department of Anesthesia, St. Bartholomew's Hospital at Smithfield, West Smithfield, London EC1A 7BE, United Kingdom.
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