The effect of adding a heated humidified breathing circuit on body temperature in healthy anesthetized dogs

Susan M. Jones Department of Small Animal Medicine and Surgery, Veterinary Teaching Hospital, College of Veterinary Medicine, University of Georgia, Athens, GA

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Charlotte C. Burns Department of Large Animal Medicine, Veterinary Teaching Hospital, College of Veterinary Medicine, University of Georgia, Athens, GA

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Rachel A. Reed Department of Large Animal Medicine, Veterinary Teaching Hospital, College of Veterinary Medicine, University of Georgia, Athens, GA

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Jane E. Quandt Department of Small Animal Medicine and Surgery, Veterinary Teaching Hospital, College of Veterinary Medicine, University of Georgia, Athens, GA

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Michele Barletta Department of Large Animal Medicine, Veterinary Teaching Hospital, College of Veterinary Medicine, University of Georgia, Athens, GA

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Daniel M. Sakai Department of Small Animal Medicine and Surgery, Veterinary Teaching Hospital, College of Veterinary Medicine, University of Georgia, Athens, GA

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Abstract

OBJECTIVE

To compare the effect of a circulating warm water blanket (WWB) in combination with a heated humidified breathing circuit (HHBC) heated to 45 °C on rectal temperature (RT) in dogs undergoing general anesthesia for elective ovariohysterectomies.

ANIMALS

29 healthy dogs.

PROCEDURES

Dogs in the experimental group (n = 8) and dogs in the control group (21) were connected to an HHBC and a conventional rebreathing circuit, respectively. All dogs were placed on a WWB in the operating room (OR). The RT was recorded at baseline, premedication, induction, transfer to OR, every 15 minutes during maintenance of anesthesia, and extubation. Incidence of hypothermia (RT < 37 °C) at extubation was recorded. Data were analyzed using unpaired t tests, the Fisher exact test, and mixed-effect ANOVA. Statistical significance was defined as P < .05.

RESULTS

There was no difference in RT during baseline, premedication, induction, and transfer to OR. The overall RT was higher for the HHBC group during anesthesia (P = .005) and at extubation (37.7 ± 0.6 °C) compared with the control group (36.6 ± 1.0 °C; P = .006). The incidence of hypothermia at extubation was 12.5% for the HHBC group and 66.7% for the control group (P = .014).

CLINICAL RELEVANCE

The combination of HHBC and WWB can reduce the incidence of postanesthetic hypothermia in dogs. Use of an HHBC should be considered in veterinary patients.

Abstract

OBJECTIVE

To compare the effect of a circulating warm water blanket (WWB) in combination with a heated humidified breathing circuit (HHBC) heated to 45 °C on rectal temperature (RT) in dogs undergoing general anesthesia for elective ovariohysterectomies.

ANIMALS

29 healthy dogs.

PROCEDURES

Dogs in the experimental group (n = 8) and dogs in the control group (21) were connected to an HHBC and a conventional rebreathing circuit, respectively. All dogs were placed on a WWB in the operating room (OR). The RT was recorded at baseline, premedication, induction, transfer to OR, every 15 minutes during maintenance of anesthesia, and extubation. Incidence of hypothermia (RT < 37 °C) at extubation was recorded. Data were analyzed using unpaired t tests, the Fisher exact test, and mixed-effect ANOVA. Statistical significance was defined as P < .05.

RESULTS

There was no difference in RT during baseline, premedication, induction, and transfer to OR. The overall RT was higher for the HHBC group during anesthesia (P = .005) and at extubation (37.7 ± 0.6 °C) compared with the control group (36.6 ± 1.0 °C; P = .006). The incidence of hypothermia at extubation was 12.5% for the HHBC group and 66.7% for the control group (P = .014).

CLINICAL RELEVANCE

The combination of HHBC and WWB can reduce the incidence of postanesthetic hypothermia in dogs. Use of an HHBC should be considered in veterinary patients.

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