Perioperative stroke. Part II: Cardiac surgery and cardiogenic embolic stroke

Area of Science:

• Cardiovascular Surgery
• Neurology
• Anesthesiology

Background:

• Embolization is the primary cause of stroke in cardiac surgery patients.
• Intracardiac procedures carry a higher stroke risk than extracardiac ones.
• Coronary Artery Bypass Grafting (CABG) is associated with approximately 5% stroke incidence.

Purpose of the Study:

• To discuss mechanisms and risk factors for stroke in cardiac surgery.
• To explore cerebral protective strategies during cardiopulmonary bypass.
• To review the management of carotid artery disease in cardiac surgery patients.

Main Methods:

• Review of literature on stroke mechanisms in cardiac surgery.
• Discussion of anesthetic agents (isoflurane, thiopentone) and their cerebral protective properties.
• Analysis of acid-base management and cerebral perfusion monitoring during cardiopulmonary bypass.

Main Results:

• Prophylactic carotid endarterectomy is not recommended for asymptomatic carotid disease before cardiac surgery.
• Symptomatic carotid disease significantly increases stroke risk.
• Cardiogenic embolism is a likely cause of many perioperative strokes, particularly in patients with atrial fibrillation, valvular disease, or prosthetic heart valves.

Conclusions:

• Cerebral protection strategies, including anesthetic choice and monitoring, are vital.
• Management of symptomatic carotid disease is critical for stroke prevention in cardiac surgery candidates.
• Identifying and managing high-risk patients for cardiogenic embolism is essential.