Active Core Rewarming for Seawater Immersion Patients with Mild Hypothermia:A Study on Rewarming Efficacy

WU Jian; YU Hong; MENG Wentao; SUN Danhong; ZHANG Hanjing

doi:10.13919/j.issn.2095-6274.ZHJY202505018

Abstract：Objective To compare the clinical efficacy and safety of active core rewarming versus active peripheral re-warming in patients with mild hypothermia induced by seawater immersion.Methods Seventy-eight patients with mild hypo-thermia due to seawater immersion admitted between June 2020 and June 2024 were enrolled and randomly assigned to a control group(n=39)and an observation group(n=39)using a random number table.The control group received active peripheral re-warming(warming blanket),while the observation group received active core rewarming(intravenous infusion of warmed fluids+inhalation of warmed humidified oxygen).The rewarming efficiency(core temperature,mean rewarming rate),physiological indicators(heart rate,blood pressure,respiratory rate)at 2 hours post-rewarming,blood gas parameters at 6 hours post-rewarm-ing,and the incidence of complications were compared between the two groups.Results The core temperature at 1,2,3,and 4 hours post-rewarming and the mean rewarming rate in the observation group were significantly higher than those in the control group(all P<0.05).At 2 hours post-rewarming,heart rate,systolic blood pressure,diastolic blood pressure,and respiratory rate in the observation group were significantly higher than those in the control group(P<0.05).At 6 hours post-rewarming,oxygen saturation,pH,and PaO2 in the observation group were significantly higher,while PaCO2 was significantly lower than those in the control group(P<0.001).The total incidence of complications in the observation group was significantly lower than that in the control group(7.69%vs.25.64%),and the difference was statistically significant(P=0.033).Conclusion For mild hypothermia induced by seawater immersion,compared to active peripheral rewarming,active core rewarming can elevate core temperature more rapidly,more effectively improve vital signs,correct acidosis and hypoxemia,and significantly reduce the incidence of complications.It is a safer and more effective rewarming strategy.