The case was a 35-year-old man. Mandibular foramen conduction anesthesia using lidocaine was performed at the dental office. After anesthesia, he developed convulsions, stopped breathing, and underwent cardiopulmonary resuscitation by a dentist. Mandibular foramen conduction anesthesia causes the tip of the injection needle to reach the mandibular foramen, or mandibular nerve groove, from the oral cavity where the inferior alveolar nerve enters the mandible. The inferior alveolar nerve accompanies the inferior alveolar artery, which is a branch from the maxillary artery. If a local anesthetic is erroneously injected into the inferior alveolar artery, even a small amount of lidocaine may cause immediate poisoning as in this case.
