For patients with cardiovascular disease, the most common problem under anesthesia is...

• A. Bradycardia
• B. Hypertension
• C. Tachycardia
• D. Arrhythmia

Answer: (A)

Under anesthesia, patients with cardiovascular disease are especially prone to a slower heart rate because anesthesia tends to dampen the body's sympathetic support and can increase vagal tone. This combination makes bradycardia the most common problem.

Several factors contribute. Many cardiac patients are on medications such as beta-blockers that blunt the heart’s ability to speed up in response to stress or hypotension, so a fall in rate is more likely to be unopposed. Anesthetic agents like propofol and volatile agents directly depress the SA node and myocardial conduction, further lowering the heart rate. Airway manipulation and surgical stimulation can provoke reflex vagal activation, especially during induction or intubation, promoting bradycardia. Regional anesthesia can cause a sympathetic blockade, leading to vasodilation and reduced heart rate as part of the hemodynamic response.

Tachycardia and hypertension can occur, but they are less common in this context, and arrhythmias are possible but bradyarrhythmias align more routinely with the typical autonomic shifts and pharmacologic effects seen in cardiovascular disease under anesthesia. If bradycardia arises, addressing depth of anesthesia, ensuring adequate preload, and using anticholinergic therapy or pacing as needed are standard approaches to restore heart rate and stability.