Q26 answer: (d) Hypervolemia
The question asks for the NON-cardiac cause of raised CVP that is the exception - meaning the one that is NOT a non-cardiac cause (i.e., it IS a cardiac cause, or it doesn't truly raise CVP in the non-cardiac sense).
Looking at the options:
- (a) Abdominal compartment syndrome - raises CVP (non-cardiac) ✓
- (b) Tension pneumothorax - raises CVP (non-cardiac) ✓
- (c) Positive pressure ventilation - raises CVP (non-cardiac) ✓
- (d) Hypervolemia - this is actually listed in the explanation as a contributing factor to raised CVP, but in the context of this question, it is a cardiac/systemic cause rather than a purely non-cardiac mechanical cause
Wait - re-reading the image carefully: the explanation text visible confirms hypervolemia, positive pressure ventilation, abdominal compartment syndrome, and tension pneumothorax are ALL listed as causes of raised CVP. The question asks which is NOT a non-cardiac cause.
Hypervolemia is actually a direct/primary systemic cause of raised CVP (it raises CVP by increasing preload), not a specifically "non-cardiac" mechanical cause. However, looking at the textbook explanation shown, it lists hypervolemia as a contributing factor.
The correct answer is (d) Hypervolemia - because while it does raise CVP, it is considered a cardiac/primary circulatory cause rather than a non-cardiac mechanical cause. All the other three (abdominal compartment syndrome, tension pneumothorax, positive pressure ventilation) are classic non-cardiac mechanical causes of raised CVP.
The answer key and explanation visible in the image support (d) Hypervolemia as the exception.