Q: Why it is important to delay bladder catheterization in hemodynamic compromise secondary to suspected right ventricular infarct?

Answer: Bladder catheterization may increase the vagal tone and can decrease preload acutely, leading to cardiogenic shock. Mechanism supposed to be associated is an induction of a parasympathetic autonomic reflex (bradycardia and hypotension) due to a sudden decrease of bladder volume via bladder catheter, while patient is lying supine. 


References: 

Mary DA. The urinary bladder and cardiovascular reflexes. Int J Cardiol. 1989;23:11–17