An unconscious patient who was transferred from surgery to the postanesthesia care unit (PACU) 15 minutes ago has an oxygen saturation of 89%. Which action should the nurse take first?

C. Covering the patient with a warm blanket is an appropriate initial intervention to address the patient's hypothermia and shivering. Heat conservation measures, such as using blankets or warming devices, help raise the patient's body temperature and alleviate shivering.

A. While shivering and a low body temperature (hypothermia) can be common postoperative complications, holding opioid analgesics may not directly address the underlying cause of the shivering or hypothermia.

B. Notifying the anesthesia care provider is a prudent action, especially if the patient's shivering and hypothermia are suspected to be related to intraoperative factors such as inadequate warming or anesthesia-induced temperature dysregulation. However, this is not the immediate action.

D. Acetaminophen is not typically indicated as the initial treatment for hypothermia or shivering. While acetaminophen can help reduce fever and discomfort, rectal suppositories may not provide rapid temperature elevation or relief from shivering.

D. Fractures, crush injuries, or tight casts can lead to compartment syndrome. Symptoms include severe pain, swelling, numbness or tingling, and decreased sensation or function of the affected limb.

Increasing edema in the calf is a hallmark manifestation of acute compartment syndrome and indicates a worsening of the condition.

A. Malignant hyperthermia is a rare but life-threatening complication that can occur in response to certain medications used during anesthesia. Edema in the calf is not a manifestation of malignant hyperthermia.

B. Pulmonary embolism occurs when a blood clot travels to the lungs and blocks blood flow. While pulmonary embolism can cause symptoms such as chest pain, shortness of breath, and cough, edema in the calf is not a typical manifestation of this condition.

C. Fat embolism syndrome occurs when fat globules are released into the bloodstream, often after long bone fractures or orthopedic procedures. Increasing edema in the calf is not a characteristic manifestation of fat embolism syndrome.