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[Hyperthyroidism Diagnosed from Refractory Tachycardia and Hypotension during Surgery: A Case Report].

We report a case of hyperthyroidism diagnosed from refractory tachycardia and hypotension during surgery. Although the patient had exhibited tachycardia preop- eratively, it was difficult to suspect hyperthyroidism due to specific conditions of neurosurgical patient Eventually diagnosis of hyperthyroidism was made by exclusion, and prompt treatment was effectively initiated. Recently several reports suggested that landiolol was effective for rate control in patients with hyperthyroidism. At first intravenous bolus doses of landiolol were administered but were insufficient Secondly, intravenous propranolol was administered and tachycardia as well as blood pressure improved. The benefits of propranolol has been suggested.