A 42-year-old man came to a dental surgeon for oral sanation. After application of anesthesia, the patient suddenly developed nausea, weakness, constricting sensation behind the sternum, and cardiac pain. The patient's skin is pale and covered in cold clammy sweat. The patient started vomiting, lost his consciousness, and developed seizures. The patient's pupils are unresponsive to the light. The pulse is thready, blood pressure cannot be measured. Make the diagnosis: