A client had a subtotal thyroidectomy in the early morning. During evening rounds, the nurse assesses the client who now has nausea, a temperature of 105 degrees F (40.6 C), tachycardia, and extreme restlessness. What is the most likely cause of these signs and symptoms?

Choice A rationale: Tetany is a neuromuscular hyperexcitability disorder caused by hypocalcemia, which can be a complication of a thyroidectomy due to accidental removal or damage to the parathyroid glands. Symptoms include tingling sensations, muscle spasms, and carpopedal spasms. While a possible post-surgical complication, the client’s signs of high temperature, tachycardia, and restlessness point to a different, more severe condition. Choice B rationale: Hypoglycemia is a state of low blood glucose, typically below 70 mg/dL. Symptoms include sweating, shakiness, confusion, and hunger. The client’s signs of a high temperature, tachycardia, and extreme restlessness are not classic symptoms of hypoglycemia. Furthermore, hypoglycemia is not typically a complication of a thyroidectomy unless the client has a pre-existing diabetic condition. Choice C rationale: A thyroid crisis, or thyroid storm, is a life-threatening complication of hyperthyroidism that can be precipitated by surgery, particularly a thyroidectomy, in an inadequately prepared client. It is characterized by a massive release of thyroid hormones, leading to a hypermetabolic state with symptoms including extremely high fever, severe tachycardia, altered mental status, and cardiovascular collapse. The client's symptoms are classic signs of this condition. Choice D rationale: Diabetic ketoacidosis (DKA) is a severe complication of uncontrolled diabetes mellitus characterized by hyperglycemia, metabolic acidosis, and ketone body production. Symptoms include fruity breath, abdominal pain, and Kussmaul respirations. A thyroidectomy is not a direct cause of DKA. The client’s signs and symptoms, particularly the very high temperature, are not typical of DKA.