During stage III anesthesia, which species has the highest heart rate as bradycardia occurs?

During stage III anesthesia, which species has the highest heart rate as bradycardia occurs?

• A. Dog : 60-70 bpm
• B. Cat : 100 bpm
• C. Horse : 25 bpm
• D. Cow : 40 bpm

Answer: (B)

During stage III anesthesia, how the heart rate changes under different species is influenced by autonomic tone and the depressant effects of anesthetics. While bradycardia can occur in many species, the actual heart rate present as bradycardia develops differs among them. Cats tend to maintain a relatively higher heart rate under surgical anesthesia compared with dogs, horses, and cattle. In this context, a cat with about 100 bpm is higher than a dog around 60–70 bpm, a horse around 25 bpm, or a cow around 40 bpm. This reflects the species pattern that small mammals like cats can sustain a higher heart rate even when bradycardic under anesthesia. If bradycardia is noted, it’s important to assess anesthetic depth and consider appropriate supportive measures, but the cat’s heart rate remains the highest among these options.

During stage III anesthesia, how the heart rate changes under different species is influenced by autonomic tone and the depressant effects of anesthetics. While bradycardia can occur in many species, the actual heart rate present as bradycardia develops differs among them. Cats tend to maintain a relatively higher heart rate under surgical anesthesia compared with dogs, horses, and cattle. In this context, a cat with about 100 bpm is higher than a dog around 60–70 bpm, a horse around 25 bpm, or a cow around 40 bpm. This reflects the species pattern that small mammals like cats can sustain a higher heart rate even when bradycardic under anesthesia. If bradycardia is noted, it’s important to assess anesthetic depth and consider appropriate supportive measures, but the cat’s heart rate remains the highest among these options.