Department of Primary Care, Animal Health Institute, College of Veterinary Medicine, Midwestern University, Glendale, AZ, USA.
College of Veterinary Medicine, Midwestern University, Glendale, AZ, USA.
J Feline Med Surg. 2023 Mar;25(3):1098612X231157585. doi: 10.1177/1098612X231157585.
Hypothermia is a common complication of anesthesia, particularly in cats. Some veterinarians insulate the extremities of cats as a preventive measure, and there is evidence that heating the extremities of dogs decreases the rate of heat loss from the core. This study investigated whether active warming or passive insulation of the extremities of cats resulted in a slower decrease in rectal temperature during anesthesia.
Female cats were assigned via block randomization to passive (cotton toddler socks), active (heated toddler socks) or control group (uncovered extremities). Rectal temperature was monitored every 5 mins from induction through return to trap/carrier (final temperature). Multivariable linear regression models were used to compare temperature (rate change and final) between groups.
There were 164 cats with 1757 temperature readings. Mean total duration of anesthesia was 53 ± 13 mins. The temperature of all groups decreased linearly over time (all <0.0001), with the rates of temperature decrease being -0.039°F/min (95% confidence interval [CI] -0.043 to -0.035)/-0.022°C (95% CI -0.024 to -0.019), -0.039°F/min (95% CI -0.042 to -0.035)/-0.022°C (95% CI -0.023 to -0.019) and -0.029°F/min (95% CI -0.032 to -0.025)/-0.016°C (95% CI -0.018 to -0.014) for the control, passive and active groups, respectively. The control, passive and active groups had median final temperatures of 98.4°F (interquartile range [IQR] 97.6-99.4)/36.9°C (IQR 36.4-37.4), 98.0°F (IQR 97.2-98.7)/36.7°C (IQR 36.2-37.1) and 99.1°F (IQR 97.7-100.0)/37.3°C (IQR 36.5-37.8), respectively. After controlling for weight, postinduction temperature and duration of anesthesia, and as compared with controls, the final temperature of the active group was predicted to be 0.54°F (95% CI 0.03-1.01)/0.3°C (95% CI 0.02-0.56) greater ( = 0.023), while the passive group was not significantly different ( = 0.130).
The rate of rectal temperature decrease was significantly slower for the active group compared with the other groups. Although the cumulative difference in final temperature reading was modest, superior materials might enhance performance. Cotton toddler socks alone did not slow the rate of temperature decrease.
低温是麻醉的常见并发症，尤其是在猫中。一些兽医将猫的四肢隔热作为预防措施，有证据表明加热狗的四肢可降低核心热量损失的速度。本研究调查了猫的四肢主动加热或被动隔热是否会导致麻醉过程中直肠温度下降速度减慢。
通过块随机分配，将雌性猫分为被动组（棉质幼儿袜子）、主动组（加热的幼儿袜子）或对照组（暴露的四肢）。从诱导开始至返回陷阱/载体（最终温度），每 5 分钟监测一次直肠温度。使用多变量线性回归模型比较组间的温度（变化率和最终温度）。
共有 164 只猫，有 1757 个温度读数。平均麻醉总持续时间为 53±13 分钟。所有组的体温均随时间呈线性下降（均 <0.0001），体温下降率分别为-0.039°F/min（95%置信区间[CI]：-0.043 至 -0.035）/-0.022°C（95% CI：-0.024 至 -0.019）、-0.039°F/min（95% CI：-0.042 至 -0.035）/-0.022°C（95% CI：-0.023 至 -0.019）和-0.029°F/min（95% CI：-0.032 至 -0.025）/-0.016°C（95% CI：-0.018 至 -0.014），分别为对照组、被动组和主动组。对照组、被动组和主动组的中位最终温度分别为 98.4°F（四分位间距[IQR]：97.6-99.4）/36.9°C（IQR：36.4-37.4）、98.0°F（IQR：97.2-98.7）/36.7°C（IQR：36.2-37.1）和 99.1°F（IQR：97.7-100.0）/37.3°C（IQR：36.5-37.8）。在控制体重、诱导后温度和麻醉持续时间后，与对照组相比，主动组的最终温度预计会高 0.54°F（95% CI：0.03-1.01）/0.3°C（95% CI：0.02-0.56）（ = 0.023），而被动组无显著差异（ = 0.130）。
与其他组相比，主动组的直肠温度下降速度明显较慢。尽管最终温度读数的累积差异较小，但更好的材料可能会提高性能。单独使用棉质幼儿袜子并不能降低体温下降速度。
