This case report describes a 10-year-old female patient who underwent ketamine sedation for fracture reduction and experienced asymptomatic ventricular tachycardia after the sedation. She had no history of syncope, chest pain, palpations, or light-headedness and had a normal physical examination. This is the first reported case of a patient experiencing ventricular tachycardia after ketamine use for sedation. This case demonstrates a serious and potentially harmful possible adverse effect of ketamine administration.