What is the effect of dehydration on postoperative recovery?

Dehydration can significantly impact postoperative recovery, primarily by hindering the healing process and supporting renal function. After surgery, the body requires adequate hydration to facilitate various physiological processes, including nutrient transport, waste elimination, and thermoregulation. When a patient is dehydrated, there is a reduced blood volume, which can lead to impaired tissue perfusion and oxygen delivery to healing tissues. This can slow down the recovery process and increase the risk of complications, such as wound infection and delayed healing.

Additionally, hydration plays a crucial role in maintaining renal function. The kidneys require sufficient fluid to filter waste from the blood effectively and to maintain electrolyte balance. Dehydration can lead to acute kidney injury, particularly in postoperative patients who are already at risk due to surgical stress, anesthesia, and potential blood loss during the procedure. Therefore, ensuring proper hydration is vital for both the healing process and overall kidney health, making option B the correct choice.