General anesthesia for giant tumor resection and facial reconstruction in a patient with atrial fibrillation, hypertension, heart valve diseases (case report)

General anesthesia for giant tumor resection and facial reconstruction in the elderly patients with atrial fibrillation, hypertension, and comorbidity valvular heart disease presents a major challenge for both anesthesiologists and surgeons in terms of the prevention and management of complications that may occur before, during, and after surgery.