During induction for a patient with complex coronary disease, the appearance of new V waves on the pulmonary capillary wedge pressure tracing would prompt administration of which medication to reduce left atrial pressure?

During induction for a patient with complex coronary disease, the appearance of new V waves on the pulmonary capillary wedge pressure tracing would prompt administration of which medication to reduce left atrial pressure?

• A. Nitroglycerin
• B. Nitroprusside
• C. Esmolol
• D. Phenylephrine

Answer: (A)

When new V waves appear on the pulmonary capillary wedge pressure tracing, it means left atrial pressure has risen, reflecting increased left-sided filling pressures and potential pulmonary venous congestion. In the induction phase for a patient with complex coronary disease, lowering left atrial pressure helps reduce pulmonary edema risk and myocardial wall stress. Nitroglycerin is a venodilator that mainly decreases preload by dilating the venous capacitance vessels. By reducing the amount of blood returning to the left heart, it lowers left atrial pressure and the wedge pressure, helping stabilize the heart and lungs during induction without causing a large drop in blood pressure from arterial dilation. This targeted preload reduction makes it the most suitable choice to address elevated left atrial pressure indicated by V waves. Esmolol focuses on reducing heart rate and contractility, which doesn’t directly relieve elevated left atrial pressure and can worsen hypotension. Phenylephrine raises afterload, which can increase left-sided filling pressures. Nitroprusside lowers both preload and afterload but carries a higher risk of hypotension and reflex tachycardia, which can be undesirable in this context.

When new V waves appear on the pulmonary capillary wedge pressure tracing, it means left atrial pressure has risen, reflecting increased left-sided filling pressures and potential pulmonary venous congestion. In the induction phase for a patient with complex coronary disease, lowering left atrial pressure helps reduce pulmonary edema risk and myocardial wall stress.

Nitroglycerin is a venodilator that mainly decreases preload by dilating the venous capacitance vessels. By reducing the amount of blood returning to the left heart, it lowers left atrial pressure and the wedge pressure, helping stabilize the heart and lungs during induction without causing a large drop in blood pressure from arterial dilation. This targeted preload reduction makes it the most suitable choice to address elevated left atrial pressure indicated by V waves.

Esmolol focuses on reducing heart rate and contractility, which doesn’t directly relieve elevated left atrial pressure and can worsen hypotension. Phenylephrine raises afterload, which can increase left-sided filling pressures. Nitroprusside lowers both preload and afterload but carries a higher risk of hypotension and reflex tachycardia, which can be undesirable in this context.