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Cooling effect of continuous renal replacement therapy in critically ill patients

医学 肾脏替代疗法 体温过低 重症监护室 血液透析 麻醉 摄氏度 外科 内科学 物理 热力学
作者
Noriko Yagi,Martine Leblanc,Ken Sakai,EJ Wright,Paganini Ep
出处
期刊:American Journal of Kidney Diseases [Elsevier]
卷期号:32 (6): 1023-1030 被引量:77
标识
DOI:10.1016/s0272-6386(98)70078-2
摘要

Hypothermia is reported to increase intensive care unit (ICU) mortality. The heat loss that occurs during continuous renal replacement therapy (CRRT) favors the development of hypothermia. In an effort to assess the influence of CRRT on body temperature, we reviewed the records of 72 consecutive ICU patients treated with CRRT and further prospectively studied the temperature in the inlet and outlet lines for blood and dialysate of 27 other patients at various flow settings during continuous venovenous hemodialysis (CVVHD). Among the 72 retrospective cases, 36 episodes of hypothermia (core body temperature <35.5 degrees C) occurred and persisted for a mean of 2.6+/- 1.8 days. It was more frequent during venovenous than arteriovenous modalities (31 of 67 v5 of 20, respectively); no patients developed hypothermia during arteriovenous slow continuous ultrafiltration (AVSCUS), whereas 48% of the patients undergoing CVVHD became hypothermic, occurring earlier in the therapy course (days 2 to 4). Mean arterial pressure (MAP) tended to increase after CRRT initiation, but absolute changes were not statistically significant. In the prospective arm, the CVVHD circuit temperatures were directly measured. Whereas no attempt was made to change body temperature, stepwise changes in blood (Qb) and dialysate flow rate (Qd) produced venous circuit temperature changes: the higher the Qb, the smaller the arteriovenous temperature differences independent of changes in Qd (P < 0.001). Also, venous circuit temperature varied directly with Qd at fixed Qb (P < 0.001). This relationship also held for temperature conversion to lost energy units per minute. Using room temperature dialysate, CRRT may significantly lower patients' core temperatures. Although the clinical significance of this effect is not clear at this point, energy loss during CVVHD may be important in hemodynamic stability or patient prognosis. (Am J Kidney Dis 1998 Dec;32(6):1023-30)
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