Abstract
RATIONALE: Primary hyperparathyroidism (PHPT), which is characterized by increased parathyroid hormone secretion, typically manifests as hypercalcemia and hypertension. Here, we report a case of severe hypotension following tracheal intubation during anesthesia induction in a patient with PHPT, in contrast to the expected hypertensive response. PATIENT CONCERNS: A 52-year-old man presented with nausea after eating, leg pain when walking, and headaches. DIAGNOSIS: Based on the blood test and computed tomography results, he was diagnosed with PHPT. INTERVENTIONS: The patient underwent parathyroidectomy under general anesthesia. After induction anesthesia and tracheal intubation, severe acute hypotension and tachycardia suddenly developed. To treat hypotensive shock, we immediately administered ephedrine and phenylephrine and infused Ringer solution. OUTCOMES: The symptoms of hypotensive shock were alleviated by this intervention. LESSONS: We speculate that the cause of his severe hypotension was vasodilation due to the transient release of parathyroid hormone from mechanical stimulation by anesthetic procedures, such as tracheal intubation, combined with hypercalcemia-induced severe dehydration. Moreover, we speculate that fluid resuscitation stabilized his condition and helped achieve a successful surgical outcome. The possibility of severe hypotension after anesthesia induction should be anticipated, and management of cases with severe dehydration should be optimized during the anesthetic management of patients with PHPT.