During maintenance anesthesia, which thermoregulatory change are sighthounds prone to?

During maintenance anesthesia, which thermoregulatory change are sighthounds prone to?

• A. Hypothermia
• B. Hyperthermia
• C. Normothermia
• D. Pyrexia

Answer: (A)

During maintenance anesthesia, sighthounds tend to become hypothermic because their lean bodies have a high surface-area-to-volume ratio and little insulating fat, so they lose heat to the cooler environment quickly. Anesthesia also reduces metabolic heat production and abolishes shivering, while vasodilation during anesthesia speeds heat loss. The operating room is usually cool, the animal is exposed, and IV fluids or warmed surfaces can be colder than the body, all contributing to a drop in core temperature. Hyperthermia or fever would require excess heat production or an inflammatory process, which is not typical under anesthesia, and normothermia would mean temperature stays normal, which is unlikely in these conditions. Therefore, the expected thermoregulatory change is hypothermia.

During maintenance anesthesia, sighthounds tend to become hypothermic because their lean bodies have a high surface-area-to-volume ratio and little insulating fat, so they lose heat to the cooler environment quickly. Anesthesia also reduces metabolic heat production and abolishes shivering, while vasodilation during anesthesia speeds heat loss. The operating room is usually cool, the animal is exposed, and IV fluids or warmed surfaces can be colder than the body, all contributing to a drop in core temperature. Hyperthermia or fever would require excess heat production or an inflammatory process, which is not typical under anesthesia, and normothermia would mean temperature stays normal, which is unlikely in these conditions. Therefore, the expected thermoregulatory change is hypothermia.