It is a common knowledge to anesthesiologists that bleeding can eventually lead to shock and it is a mandatory task of anesthesiologists to monitor and prepare for postoperative bleeding. We have experienced at recovery room a case of cardiac arrest due to massive bleeding after a spinal surgery in a 62-year-old lady weighing 60 kg with no specific abnormalities in both history and physical examination. Immediate intervention with CPR, DC shock and administration of blood and fluids revived her and a subsequent surgical procedure was performed for bleeding control. The major common cause of cardiac arrest associated with operation/anesthesia are cardiovascular failure and respiratory failure. Postoperative bleeding, therefore, warrants close and careful monitoring in order that immediate and optimal care can be provided.