Which medication acts as a vasodilator used in the treatment of pulmonary edema?

Which medication acts as a vasodilator used in the treatment of pulmonary edema?

• A. Albuterol
• B. Nitroglycerin
• C. Morphine
• D. Furosemide

Answer: (B)

In acute pulmonary edema from left-sided heart failure, rapidly reducing the pressures that push fluid into the lungs is the key. A vasodilator used for this purpose is nitroglycerin. It mainly dilates the venous system, which lowers preload and left ventricular end-diastolic pressure. By reducing these filling pressures, pulmonary venous congestion decreases, the hydrostatic pressure in the pulmonary capillaries falls, and fluid leakage into the lung tissue improves quickly. This leads to relief of dyspnea and better oxygenation, often within minutes when given intravenously. At higher doses, nitroglycerin can also dilate arteries and lower afterload, adding to the improvement. Albuterol is a bronchodilator used for airway constriction, not for addressing pulmonary edema hemodynamics. Morphine has been used historically to relieve dyspnea, but it is not a vasodilator and can depress respiration. Furosemide is a diuretic that reduces fluid volume over time, indirectly helping preload, but it does not act as a vasodilator and does not provide the same rapid hemodynamic relief as nitroglycerin.

In acute pulmonary edema from left-sided heart failure, rapidly reducing the pressures that push fluid into the lungs is the key. A vasodilator used for this purpose is nitroglycerin. It mainly dilates the venous system, which lowers preload and left ventricular end-diastolic pressure. By reducing these filling pressures, pulmonary venous congestion decreases, the hydrostatic pressure in the pulmonary capillaries falls, and fluid leakage into the lung tissue improves quickly. This leads to relief of dyspnea and better oxygenation, often within minutes when given intravenously. At higher doses, nitroglycerin can also dilate arteries and lower afterload, adding to the improvement.

Albuterol is a bronchodilator used for airway constriction, not for addressing pulmonary edema hemodynamics. Morphine has been used historically to relieve dyspnea, but it is not a vasodilator and can depress respiration. Furosemide is a diuretic that reduces fluid volume over time, indirectly helping preload, but it does not act as a vasodilator and does not provide the same rapid hemodynamic relief as nitroglycerin.