Anti-Arrhythmic Medications in the Perioperative Setting: Considerations for Anesthesia Providers

Anti-arrhythmic medications are commonly encountered in the perioperative setting because anesthesia providers frequently care for patients with atrial fibrillation, supraventricular tachycardia, ventricular arrhythmias, and other cardiovascular conditions. Surgical stress, pain, hypoxia, electrolyte imbalances, and some anesthetic medications can all trigger abnormal heart rhythms during surgery (1). These arrhythmias may reduce cardiac output, increase myocardial oxygen demand, and lead to unstable blood pressure or poor organ perfusion. Because of this, anesthesia providers must understand the effects of anti-arrhythmic medications and recognize how these drugs interact with anesthetic agents and normal physiologic changes that occur during and after surgery. 

Preoperative evaluation should include a careful review of the patient’s cardiac history, current medications, baseline electrocardiogram, electrolyte levels, and overall cardiovascular status. In most situations, chronic anti-arrhythmic medications should be continued throughout the perioperative period to avoid rebound tachycardia or recurrence of arrhythmias (2). Beta-blockers are especially important to continue because sudden withdrawal may increase heart rate, blood pressure, and the risk of myocardial ischemia. At the same time, anesthesia providers must be aware that, when combined with anesthetic drugs, many anti-arrhythmic medications can worsen bradycardia, low blood pressure, or decreased cardiac function. Good communication between anesthesia providers, surgeons, and cardiology teams is often necessary when caring for high-risk patients. 

Beta-blockers are among the most commonly used perioperative anti-arrhythmic medications because they reduce sympathetic stimulation and slow the heart rate. These effects help control atrial fibrillation and reduce stress-related tachycardia during surgery. Esmolol is commonly used in the operating room because it works quickly and has a short duration of action, allowing rapid adjustment if blood pressure or heart rate changes unexpectedly. However, beta-blockers may also cause excessive slowing of the heart rate, low blood pressure, bronchospasm, or reduced cardiac output, particularly when combined with propofol, opioids, or volatile anesthetics (3). Continuous monitoring of heart rate and blood pressure is therefore essential during administration. 

Amiodarone is another important anti-arrhythmic medication frequently used in the perioperative setting that is effective for both atrial and ventricular arrhythmias. It is commonly used for atrial fibrillation after cardiac surgery and for serious ventricular arrhythmias that do not respond to other treatments (4). Although effective, amiodarone has several side effects that anesthesia providers must recognize. Intravenous administration may cause hypotension and bradycardia, especially if given too quickly. Long-term therapy may also affect the lungs, liver, or thyroid gland. In addition, amiodarone can prolong the QT interval, which increases the risk of dangerous arrhythmias when combined with other medications that affect cardiac conduction. Electrolyte abnormalities such as low potassium or low magnesium may further increase this risk and should be corrected promptly. 

Calcium channel blockers such as diltiazem and verapamil may also be used for heart rate control in supraventricular tachyarrhythmias. These medications slow electrical conduction through the heart but may also worsen low blood pressure or decreased cardiac function during anesthesia (5). Lidocaine may be used to treat ventricular arrhythmias, particularly in patients with myocardial ischemia, although excessive dosing can cause neurologic and cardiovascular side effects. Regardless of the medication used, management of perioperative arrhythmias should focus on identifying reversible causes, maintaining adequate oxygenation and ventilation, correcting electrolyte abnormalities, and closely monitoring the patient’s hemodynamic status.  

References 

1. Atlee JL. Perioperative cardiac dysrhythmias: diagnosis and management. Anesthesiology. 1997;86(6):1397-1424. doi:10.1097/00000542-199706000-00026 
2. Blessberger H, Lewis SR, Pritchard MW, et al. Perioperative beta-blockers for preventing surgery-related mortality and morbidity in adults undergoing non-cardiac surgery. Cochrane Database Syst Rev. 2019;9(9):CD013438. Published 2019 Sep 26. doi:10.1002/14651858.CD013438 
3. Thompson A, Balser JR. Perioperative cardiac arrhythmias. Br J Anaesth. 2004;93(1):86-94. doi:10.1093/bja/aeh166 
4. Amar D. Perioperative atrial tachyarrhythmias. Anesthesiology. 2002;97(6):1618-1623. doi:10.1097/00000542-200212000-00039 
5. Melduni RM, Koshino Y, Shen WK. Management of arrhythmias in the perioperative setting. Clin Geriatr Med. 2012;28(4):729-743. doi:10.1016/j.cger.2012.08.006