Among the intraventricluar block, bundle branch block is the most common type and left bundle branch block(LBBB) may progress to a more serious condition of complete heart block. Anesthetic methods such as nitrous oxide-oxygen-relaxant sequence, neuroleptanesthesia, and nitrous oxide-oxygen-minimal halothane(or penthrane) are generally accepted by the patient with heart disease. In the U.S., opioid anesthesia is also applied frequently. The authors successfully twice performed of operations with balanced anesthesia and spinal anesthesia respectively in a 39-year-old male patient who showed complete left bundle branch block pattern in a preoperative electrocardiographic tracing without any subjective symptoms.