What postoperative complication is characterized by internal bleeding and may require immediate attention?

The correct answer is hematoma, which is a collection of blood outside of blood vessels that can occur postoperatively. This condition is significant because it involves internal bleeding that may interfere with healing, lead to increased pressure on surrounding tissues or organs, and can sometimes result in shock if the bleeding is extensive.

Hematomas require immediate attention, as they may necessitate drainage or further surgical intervention to control the bleeding and prevent further complications. The ability to recognize a hematoma is crucial, particularly in the context of postoperative care, where monitoring for signs of excessive bleeding or swelling at surgical sites is essential for patient safety and recovery.

In contrast to hematomas, infections typically manifest later and can often be managed over time with antibiotics and supportive care. Pneumonia, while serious, usually relates to respiratory function and is typically associated with postoperative immobility and can be addressed with respiratory therapies and antibiotics. Constipation can be uncomfortable and may require management with medications or dietary changes, but it does not present immediate risk of internal bleeding like a hematoma. Therefore, understanding the implications and urgency of addressing a hematoma is vital for postoperative care.