Question

Difficulty: EasyPharmacologic Interventions

A 68-year-old man is brought to the emergency department due to severe, rapidly worsening shortness of breath that began 22 hours ago. His medical history includes hypertension, coronary artery disease, and heart failure with reduced ejection fraction (left ventricular ejection fraction of 30%30\%). On arrival, he appears extremely anxious, diaphoretic, and is using accessory muscles of respiration. Vital signs are temperature 37.1∘C37.1^\circ\text{C} (98.8∘F98.8^\circ\text{F}), blood pressure 215/115 mmHg215/115\text{ mmHg}, heart rate 118/min118/\text{min}, respiratory rate 32/min32/\text{min}, and oxygen saturation 86%86\% on room air. Physical examination reveals distended jugular veins and diffuse bilateral crackles halfway up the lung fields. A bedside electrocardiogram shows sinus tachycardia with no acute ischemic changes. Which of the following pharmacologic interventions are most appropriate for the immediate management of this patient's condition? (Select all that apply)

  1. Intravenous furosemideAnswer
  2. Intravenous nitroglycerinAnswer
  3. C
    Oral carvedilol
  4. D
    Intravenous diltiazem
  5. E
    Oral ibuprofen

Answer

The correct interventions are intravenous furosemide and intravenous nitroglycerin.
The patient presents with acute decompensated heart failure (ADHF) characterized by a hypertensive emergency resulting in flash pulmonary edema. The immediate management of hypertensive ADHF requires agents that rapidly reduce both preload (returning blood to the heart) and afterload (the resistance the heart pumps against). Intravenous vasodilators like nitroglycerin are first-line agents in this scenario as they promptly reduce blood pressure and ventricular filling pressures. Intravenous loop diuretics like furosemide are also standard of care; they act quickly to relieve volume overload through diuresis and provide a mild, immediate venodilatory effect that helps decrease pulmonary congestion.

Step-by-Step Solution

1
Identify the primary clinical syndrome.
The patient is experiencing acute decompensated heart failure presenting as flash pulmonary edema driven by a hypertensive emergency.
This is evidenced by the history of heart failure with reduced ejection fraction, extreme hypertension (215/115 mmHg215/115\text{ mmHg}), severe hypoxia, and bilateral lung crackles.
2
Determine the immediate pharmacologic goals.
The primary goals are to rapidly reduce ventricular preload and afterload, and to remove excess intravascular volume.
The failing left ventricle is overwhelmed by the extremely high systemic vascular resistance, causing a rapid back-up of fluid into the pulmonary vasculature.
3
Select the appropriate medications to achieve these goals while avoiding contraindicated agents.
Intravenous nitroglycerin is selected to provide rapid venodilation and arteriodilation. Intravenous furosemide is selected to promote diuresis and provide immediate mild venodilation.
These agents work synergistically to offload the failing heart without negatively impacting cardiac contractility, unlike beta-blockers or non-dihydropyridine calcium channel blockers.

Key Concept

Management of acute decompensated heart failure and recognition of contraindicated medications
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