1Penn Vet Working Dog Center, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA.
2Department of Clinical Sciences and Advanced Medicine, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA.
J Am Vet Med Assoc. 2024 Sep 4;262(12):1613-1621. doi: 10.2460/javma.24.06.0368. Print 2024 Dec 1.
To evaluate field-applicable cooling methods for treatment of exercise-induced hyperthermia in dogs.
In this randomized, crossover study from June 27, 2023, to July 24, 2023, 12 working dogs exercised for 10 minutes until core body temperature reached 40.6 °C or above or ≥ 2 signs of heat stress were observed. Four different cooling protocols were evaluated: (1) neck chemical ice packs (2), (2) a wet (22 °C) neck towel, (3) wet (22 °C) axillae towels, or (4) voluntary head immersion ("dunking") into (22 °C) water. After intervention, dogs rested and were monitored for 40 minutes.
The dunking protocol, which included limited water ingestion, produced the lowest mean core temperature in the initial 5 minutes after exercise, in the subsequent 35 minutes during which dogs cooled to baseline temperature and was the only protocol to prevent the initial postexercise temperature rise. All methods resulted in return to baseline temperature.
Trained voluntary head dunk with limited water ingestion results in rapid cooling in field situations of exercise-induced hyperthermia in dogs with normal mental status and ability to pause panting.
"Cool first, transport second" reduces morbidity and mortality of acute heat injury. When whole-body water immersion is not an option, the trained voluntary head dunk in mentally appropriate dogs prevents postexercise rise and rapidly reduces core body temperature within the first 5 minutes. Alternatively, allowing the dog to drink controlled amounts of cool water and pouring water on the dog's head may provide some benefit but warrants further study.
评估现场应用的冷却方法治疗犬运动性发热。
在 2023 年 6 月 27 日至 7 月 24 日进行的这项随机、交叉研究中，12 只工作犬运动 10 分钟，直到核心体温达到 40.6°C 或以上，或观察到≥2 项热应激迹象。评估了 4 种不同的冷却方案：(1)颈部化学冰袋(2)，(2)湿(22°C)颈部毛巾，(3)湿(22°C)腋窝毛巾，或(4)自愿头部浸入(22°C)水中。干预后，狗休息并监测 40 分钟。
包含有限饮水的浸泡协议在运动后最初 5 分钟内产生最低的平均核心体温，在随后的 35 分钟内，狗冷却至基础体温，并且是唯一防止初始运动后体温升高的协议。所有方法均导致体温恢复到基础体温。
训练有素的自愿头部浸泡，同时限制饮水，可在犬正常精神状态和停止喘气能力的情况下，迅速冷却运动性发热的现场情况。
“先冷却，后转运”可降低急性热损伤的发病率和死亡率。当全身水浸不是一种选择时，在精神状态合适的犬中进行训练有素的自愿头部浸泡可防止运动后体温升高，并在最初 5 分钟内迅速降低核心体温。或者，允许狗饮用适量的冷水，并将水倒在狗的头上可能会有一些益处，但需要进一步研究。
