Objective: To evaluate the effectiveness of mild hypothermia on low cardiac output in patients after cardiac surgery.
Methods: Twelve patients manifesting low cardiac output after cardiac surgery despite of the use of massive doses of catecholamine and intra-aortic balloon pump (IABP) underwent mild hypothermia during May 2009 to February 2011. Changes in hemodynamic parameters of the patients were measured, including cardiac index (CI),mixed venous oxygen saturation [SvO(2)] and urine volume.
Results: In the process of mild hypothermia treatment, bladder temperature of patients was lowered to 33-35 centigrade in order to reduce the body oxygen demand. The CI [ml·s(-1)·m(-2)]of patients after mild hypothermia treatment was increased obviously (38.34 ± 5.00 vs. 30.01 ± 5.00), the same as SvO(2) (0.64 ± 0.07 vs. 0.54 ± 0.08) and urine output [ml·kg(-1)·h(-1): 3.0 ± 2.1 vs. 1.5 ± 1.1, all P < 0.05]. However, there was no significant change in heart rate, mean arterial pressure and blood oxygen pressure.
Conclusion: Mild hypothermia is an effective and simple procedure to improve the cardiac function in patients after cardiac surgery complicated with low cardiac output.
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