Prospective, randomized trial comparing fluids and dobutamine optimization of oxygen delivery in high-risk surgical patients [ISRCTN42445141]

Suzana M Lobo, Francisco R Lobo, Carlos A Polachini, Daniela S Patini, Adriana E Yamamoto, Neymar E de Oliveira, Patricia Serrano, Helder S Sanches, Marco A Spegiorin, Marcio M Queiroz, Antonio C Christiano Jr, Elisangela F Savieiro, Paula A Alvarez, Silvia P Teixeira, Geni S Cunrath, Suzana M Lobo, Francisco R Lobo, Carlos A Polachini, Daniela S Patini, Adriana E Yamamoto, Neymar E de Oliveira, Patricia Serrano, Helder S Sanches, Marco A Spegiorin, Marcio M Queiroz, Antonio C Christiano Jr, Elisangela F Savieiro, Paula A Alvarez, Silvia P Teixeira, Geni S Cunrath

Abstract

Introduction: Preventing perioperative tissue oxygen debt contributes to a better postoperative recovery. Whether the beneficial effects of fluids and inotropes during optimization of the oxygen delivery index (DO2I) in high-risk patients submitted to major surgeries are due to fluids, to inotropes, or to the combination of the two is not known. We aimed to investigate the effect of DO2I optimization with fluids or with fluids and dobutamine on the 60-day hospital mortality and incidence of complications.

Methods: A randomized and controlled trial was performed in 50 high-risk patients (elderly with coexistent pathologies) undergoing major elective surgery. Therapy consisted of pulmonary artery catheter-guided hemodynamic optimization during the operation and 24 hours postoperatively using either fluids alone (n = 25) or fluids and dobutamine (n = 25), aiming to achieve supranormal values (DO2I > 600 ml/minute/m2).

Results: The cardiovascular depression was an important component in the perioperative period in this group of patients. Cardiovascular complications in the postoperative period occurred significantly more frequently in the volume group (13/25, 52%) than in the dobutamine group (4/25, 16%) (relative risk, 3.25; 95% confidence interval, 1.22-8.60; P < 0.05). The 60-day mortality rates were 28% in the volume group and 8% in the dobutamine group (relative risk, 3.00; 95% confidence interval, 0.67-13.46; not significant).

Conclusion: In patients with high risk of perioperative death, pulmonary artery catheter-guided hemodynamic optimization using dobutamine determines better outcomes, whereas fluids alone increase the incidence of postoperative complications.

Figures

Figure 1
Figure 1
Treatment algorithm. MAP, mean arterial pressure; PAOP, pulmonary artery occlusion pressure; Ht, hematocrit; SaO2, arterial oxygen saturation; DO2I, oxygen delivery index; RBC, red blood cells; CI, cardiac index.
Figure 2
Figure 2
Oxygen delivery index during surgery and postoperatively. Oxygen delivery index (DO2I) during surgery and postoperatively for the volume group (●) and the dobutamine group (■). *P < 0.05 versus volume group, #P < 0.05 versus baseline. Results presented as the mean and standard error or the mean. 0, preoperative; 1, 30 min intraoperatively; 2, 2 hours intraoperatively; 3, 4 hours intraoperatively; 4, 6 hours intraoperatively; 5, 8 hours intraoperatively; 6, 0 hours postoperatively; 7, 4 hours postoperatively; 8, 8 hours postoperatively; 10, 12 hours postoperatively; 11, 16 hours postoperatively; 12, 24 hours postoperatively.

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