Department of Anesthesiology, Sichuan Provincial Orthopedic Hospital, No. 132 West First Section First Ring Road, Chengdu, 610041, Sichuan, China.
BMC Anesthesiol. 2022 Feb 28;22(1):55. doi: 10.1186/s12871-022-01597-6.
Forced-air warming (FAW) is an effective method of preventing inadvertent perioperative hypothermia (IPH). However, its warming effects can be influenced by the style and position of the FAW blanket. This study aimed to compare the effects of underbody FAW blankets being placed under or over patients in preventing IPH.
Patients (n=100) undergoing elective arthroscopic shoulder surgery in the lateral decubitus position were randomized into either under body (UB) group or the over body (OB) group (50 per group). The body temperature of the patients was recorded from baseline to the end of anesthesia. The incidences of postoperative hypothermia and shivering were also collected.
A steady decline in the body temperature was observed in both groups up to 60 minutes after the start of FAW. After 60 minutes of warming, the OB group showed a gradual increase in the body temperature. However, the body temperature still decreased in UB group until 75 minutes, with a low of 35.7℃ ± 0.4℃. Then the body temperature increased mildly and reached 35.8℃ ± 0.4℃ at 90 minutes. After 45 minutes of warming, the body temperature between the groups was significantly different (P < 0.05). The incidence of postoperative hypothermia in the UB group was significantly higher than that in the OB group (P = 0.023).
The body temperature was significantly better with the use of underbody FAW blankets placed over patients than with them placed under patients. However, there was not a clinically significant difference in body temperature. The incidence of postoperative hypothermia was much lower in the OB group. Therefore, placing underbody FAW blankets over patients is recommended for the prevention of IPH in patients undergoing arthroscopic shoulder surgery.
This single-center, prospective, RCT has completed the registration of the Chinese Clinical Trial Center at 13/1/2021 with the registration number ChiCTR2100042071 . It was conducted from 14/1/2021 to 30/10/2021 as a single, blinded trial in Sichuan Provincial Orthopedic Hospital.
空气加热毯（FAW）是预防术中意外低体温（IPH）的有效方法。然而，其加热效果会受到 FAW 毯子的样式和位置的影响。本研究旨在比较将 FAW 毯子置于患者身体下方或上方对预防 IPH 的影响。
100 例在侧卧位接受择期关节镜肩关节手术的患者被随机分为身体下方（UB）组或身体上方（OB）组（每组 50 例）。从基线到麻醉结束时记录患者的体温。还收集了术后低体温和寒战的发生率。
两组患者的体温均在 FAW 开始后 60 分钟内持续下降。在 60 分钟的加热后，OB 组的体温逐渐升高。然而，UB 组的体温仍持续下降至 75 分钟，最低为 35.7℃±0.4℃。然后体温轻微升高，90 分钟时达到 35.8℃±0.4℃。45 分钟后，两组之间的体温有显著差异（P＜0.05）。UB 组术后低体温的发生率明显高于 OB 组（P=0.023）。
将 FAW 毯子置于患者身体上方比置于下方时，患者的体温明显更好。然而，体温没有显著差异。OB 组术后低体温的发生率明显更低。因此，建议在接受关节镜肩关节手术的患者中使用将 FAW 毯子置于患者身体上方来预防 IPH。
这项单中心、前瞻性、RCT 于 2021 年 1 月 13 日在中国临床试验中心完成注册，注册号 ChiCTR2100042071。它于 2021 年 1 月 14 日至 2021 年 10 月 30 日在四川省骨科医院进行，是一项单盲、随机试验。
