Tachycardia during GA can result from hypotension.

• A. True
• B. False
• C. Not necessarily
• D. Sometimes

Answer: (C)

The important idea is that tachycardia during anesthesia is influenced by many factors, not just blood pressure. While a drop in arterial pressure can trigger a reflex increase in heart rate (baroreceptor-mediated tachycardia), there are plenty of other reasons a patient’s heart rate might rise under general anesthesia. Drugs used in anesthesia can directly increase heart rate (for example, some agents or anticholinergics), depth of anesthesia or analgesia can alter autonomic tone, and conditions like pain, hypoxemia, hypercapnia, fever, or shivering can all raise the heart rate. Conversely, tachycardia can occur even when blood pressure is not low, and hypotension can occur with normal or reduced heart rate depending on the circumstances. Because the relationship isn’t absolute, tachycardia during GA is not solely/always due to hypotension. So the best answer is that it’s not necessarily true.