A 68-year-old woman is brought to the emergency department because of rapidly worsening shortness of breath. She awakened 1 hour ago gasping for air and coughing up pink, frothy sputum. During the preceding week, she had noticed increasing exertional dyspnea but no fever, pleuritic chest pain, or unilateral leg swelling. Her medical history includes long-standing hypertension, chronic kidney disease, and heart failure with preserved ejection fraction (HFpEF). Medications include amlodipine, losartan, and furosemide, but she has not taken them for 5 days because of nausea from a recent viral illness. Temperature is 36.8°C (98.2°F), blood pressure is 238/132 mm Hg, pulse is 122/min, respiratory rate is 34/min, and oxygen saturation is 79% on room air. On physical examination, she is agitated, diaphoretic, and sitting upright while using accessory muscles of respiration. Jugular venous pressure is elevated. Diffuse inspiratory crackles are present throughout both lung fields. Cardiac examination reveals an S4 gallop without a new murmur. The extremities are warm, and there is trace bilateral ankle edema. ECG demonstrates sinus tachycardia with left ventricular hypertrophy and repolarization abnormalities but no diagnostic ST-segment elevation. Chest radiography shows bilateral perihilar alveolar opacities and pulmonary vascular congestion. Bedside echocardiography demonstrates concentric left ventricular hypertrophy, preserved left ventricular ejection fraction, and diffuse B-lines in both lungs.
Which of the following is the most appropriate immediate treatment?
The correct answer is:
A) Continuous positive airway pressure and intravenous nitroglycerin
This patient has a hypertensive emergency complicated by acute cardiogenic pulmonary edema. Her severely elevated blood pressure is accompanied by acute end-organ injury, manifested by profound hypoxemic respiratory failure and pulmonary edema. Immediate treatment must address both impaired oxygenation and the markedly elevated ventricular filling pressures.
Noninvasive positive-pressure ventilation, such as continuous positive airway pressure or bilevel positive airway pressure, rapidly improves oxygenation and reduces the work of breathing. Positive intrathoracic pressure also decreases venous return and left ventricular afterload, which helps reduce pulmonary capillary pressure.
Intravenous nitroglycerin provides rapid, titratable vasodilation. At lower doses, it predominantly reduces preload through venodilation; at higher doses, it also decreases systemic vascular resistance and left ventricular afterload. In severe hypertensive pulmonary edema, rapid reduction of preload and afterload can produce dramatic clinical improvement by shifting fluid out of the pulmonary circulation and increasing forward cardiac output.
This presentation is sometimes described as sympathetic crashing acute pulmonary edema. The pulmonary edema may result primarily from abrupt redistribution of fluid into the lungs due to severe afterload elevation rather than from a large increase in total body volume. Consequently, vasodilation and positive-pressure ventilation often provide faster benefit than diuresis alone.
Blood pressure should be reduced in a controlled but prompt manner using titratable intravenous medication. The goal is not immediate normalization as excessive reduction can compromise cerebral, coronary, and renal perfusion in a patient whose autoregulatory mechanisms have adapted to chronic hypertension.
Answer choice B: Intravenous esmolol followed by gradual blood-pressure reduction, is incorrect.
Intravenous beta blockers are appropriate in selected hypertensive emergencies, particularly acute aortic dissection, in which reduction of heart rate and aortic shear stress is essential. In acute pulmonary edema, however, beta blockade can reduce myocardial contractility and may worsen hemodynamic decompensation. This patient requires rapid vasodilation and respiratory support rather than primary negative inotropic therapy.
Answer choice C: Intravenous furosemide as the sole initial therapy, is incorrect.
Loop diuretics are useful when intravascular volume overload contributes to acute heart failure, and furosemide may be administered as part of this patient’s treatment. However, its onset is slower than that of intravenous vasodilators, and it does not immediately correct the severe afterload elevation driving pulmonary edema. The minimal peripheral edema and abrupt presentation suggest that fluid redistribution, rather than massive total-body volume excess, is a major mechanism. Diuresis alone would therefore be inadequate as the initial intervention.
Answer choice D: Oral clonidine followed by discharge after blood-pressure improvement, is incorrect.
Oral antihypertensive therapy may be used for severe asymptomatic hypertension without acute target-organ injury. This patient has a true hypertensive emergency with life-threatening pulmonary edema and hypoxemic respiratory failure. She requires monitored treatment with rapidly titratable intravenous medication and ventilatory support. Oral clonidine has an unpredictable duration of effect and can cause oversedation or rebound hypertension.
Answer choice E: Rapid infusion of intravenous normal saline, is incorrect.
Intravenous fluid administration would increase venous return and pulmonary capillary hydrostatic pressure, worsening pulmonary edema. Although some patients with hypertensive emergencies may have relative intravascular depletion, the presence of elevated jugular venous pressure, diffuse pulmonary edema, and preserved peripheral perfusion indicates that saline administration is not appropriate.
Key Learning Point
Hypertensive emergency with acute pulmonary edema requires rapid, titratable preload and afterload reduction with intravenous vasodilator therapy, together with noninvasive positive-pressure ventilation when respiratory distress is present. Diuretics may be added but should not delay treatments that immediately reverse the hemodynamic cause of pulmonary edema.
