Recently, there was improved cardiopulmonary resuscitation in parallel with development of electric defibrillator. This 18-year-old male arrived at our hospital emergency room in shock state about 1 hour after trauma. Cardiac arrest was occurred at operating table. Promptly, open thoracotomy was performed under endotracheal intubation. There was found left ventricular laceration about 3cm in length, therefore primary closure of lacerated ventricle was done and open cardiac message, too. But ventricular fibrillation was remained. Myocardial fibrillation was disappeared after operation of defibrillator internally at 20 W/sec and 40 W/sec for 30 minutes. Thereafter, operation was finished successfully. This patient was admitted in our hospital for 32 days and discharged.