What is the most common cause of postoperative day 1 fever?

What is the most common cause of postoperative day 1 fever?

• A. Atelectasis
• B. Pulmonary embolism
• C. Pneumonia
• D. Wound infection

Answer: (A)

Fever on the first postoperative day most often comes from the body’s immediate inflammatory response to surgical trauma and the development of atelectasis from shallow breathing after anesthesia. Atelectasis refers to small areas of collapsed lung that can occur when patients take shallow breaths, especially after chest or upper abdominal operations. This collapse triggers a mild inflammatory response that can produce a low-grade fever within the first 24 hours, even in the absence of infection. In contrast, pneumonia tends to present a bit later, with signs like productive cough and focal lung findings. Wound infections typically appear after several days with localized redness, warmth, or drainage. Pulmonary embolism can cause fever as well, but it usually comes with chest pain, dyspnea, and tachycardia and isn’t as common on day one. So the most likely cause of fever on postoperative day one is atelectasis driven by shallow respirations after surgery, a scenario that is often mitigated by incentive spirometry and early mobilization. If fever persists beyond 24 hours or is accompanied by other concerning symptoms, further evaluation for infection would be warranted.

Fever on the first postoperative day most often comes from the body’s immediate inflammatory response to surgical trauma and the development of atelectasis from shallow breathing after anesthesia. Atelectasis refers to small areas of collapsed lung that can occur when patients take shallow breaths, especially after chest or upper abdominal operations. This collapse triggers a mild inflammatory response that can produce a low-grade fever within the first 24 hours, even in the absence of infection.

In contrast, pneumonia tends to present a bit later, with signs like productive cough and focal lung findings. Wound infections typically appear after several days with localized redness, warmth, or drainage. Pulmonary embolism can cause fever as well, but it usually comes with chest pain, dyspnea, and tachycardia and isn’t as common on day one.

So the most likely cause of fever on postoperative day one is atelectasis driven by shallow respirations after surgery, a scenario that is often mitigated by incentive spirometry and early mobilization. If fever persists beyond 24 hours or is accompanied by other concerning symptoms, further evaluation for infection would be warranted.