case report of sudden bundle branch block during anesthesia induction

Introduction: bundle branch blocks (bbb) are usually stable and remain unchanged irrespective of the cardiac cycle length. left bundle branch block (lbbb) usually results from conduction system degeneration or myocardial pathology. patients with lbbb have altered patterns of left ventricular activation and contraction, causing changes in left ventricular mechanics, perfusion, and workload, leading to pathologic cardiac remodeling and heart failure over time.case report: a 56-year-old female patient with no history of specific diseases was a candidate for lumbar vertebrae fixation surgery. the patient had no history of shortness of breath or chest pain. in clinical examination, heart rate was 75 times per minute and blood pressure was 145/95. after injection of anesthetic drugs, wide qrs waves and lbbb were observed in the patient's heart rhythm. the patient's heart rate and blood pressure increased. after the injection of lidocaine, amiodarone, and labetalol, the qrs was still widely monitored. after about 45 minutes and the patient was fully awake, suddenly the qrs and the vital signs were normalized.conclusion:  this case highlights the need for vigilant monitoring and prompt intervention during anesthesia induction, even in the absence of known cardiac conditions.