A patient receiving continuous positive pressure ventilation is most likely to experience which of the following?

• A. Decreased sodium
• B. Decreased urine output
• C. Depressed CNS function
• D. Increased bowel movement

Answer: (B)

In the context of a patient receiving continuous positive pressure ventilation, the most likely experience is decreased urine output. This phenomenon can occur due to several factors related to the effects of positive pressure ventilation on the body's system.

When a patient is on continuous positive pressure ventilation, there is an increase in intrathoracic pressure. This increased pressure can lead to a decrease in venous return to the heart, which in turn can reduce cardiac output. As cardiac output diminishes, renal perfusion can be affected, often leading to decreased glomerular filtration rate and subsequently lower urine output. Fluid retention may also occur as the body responds to perceived low blood volume.

Compared to other choices, decreased urine output is more directly correlated with the physiological changes associated with positive pressure ventilation. While the other outcomes might be considered in different contexts or with specific underlying conditions, they do not directly align with the typical physiological responses observed in patients undergoing this type of ventilation.