A 68-year-old man is admitted to the cardiac intensive care unit because of worsening shortness of breath, fatigue, and confusion. Over the past week, he has experienced progressive orthopnea and lower-extremity edema. During the last 24 hours, he developed oliguria and increasing lethargy. He has a history of ischemic cardiomyopathy with a left ventricular ejection fraction of 20%, prior anterior myocardial infarction, hypertension, and type 2 diabetes mellitus. Current medications include sacubitril-valsartan, metoprolol succinate, spironolactone, empagliflozin, and furosemide. Temperature is 36.6°C (97.9°F), blood pressure is 78/52 mm Hg, pulse is 116/min, respiratory rate is 28/min, and oxygen saturation is 92% on room air. Physical examination reveals an ill-appearing man in moderate respiratory distress. Jugular venous pressure is elevated to the angle of the mandible while sitting upright. Diffuse bilateral crackles are present. The extremities are cool with delayed capillary refill. There is 2+ bilateral pitting edema.
Laboratory studies show the following:
A pulmonary artery catheter is placed. Hemodynamic measurements are:
Right atrial pressure: 18 mm Hg (normal: 2–8)
Pulmonary capillary wedge pressure: 32 mm Hg (normal: 6–12)
Cardiac index: 1.6 L/min/m² (normal: 2.5–4.0)
Systemic vascular resistance: 1,900 dynes·sec/cm⁵ (normal: 800–1,200)
Which of the following is the most appropriate next step in management?
The correct answer is:
A) Intravenous dobutamine infusion
This patient has cardiogenic shock due to advanced HFrEF. The diagnosis is established by evidence of both congestion (“wet”) and hypoperfusion (“cold”).
Findings indicating congestion include:
Elevated jugular venous pressure
Pulmonary edema
Peripheral edema
Elevated right atrial pressure
Elevated pulmonary capillary wedge pressure
Findings indicating hypoperfusion include:
Hypotension
Oliguria
Acute kidney injury
Elevated lactate
Altered mental status
Cool extremities
Reduced cardiac index
The hemodynamic profile demonstrates:
Variable | Finding | Interpretation |
|---|
RA Pressure | Elevated | Systemic congestion |
PCWP | Elevated | Pulmonary congestion |
Cardiac Index | Low | Poor forward flow |
SVR | Elevated | Compensatory vasoconstriction |
This classic pattern identifies cardiogenic shock from pump failure.
Dobutamine is a beta-1 agonist that increases myocardial contractility and cardiac output. In patients with severe systolic dysfunction and low cardiac output, improving forward flow is the immediate priority to restore tissue perfusion.
A high-yield board concept is recognizing that patients with cardiogenic shock often compensate with marked vasoconstriction, resulting in elevated SVR. The primary problem is not inadequate vascular tone; it is inadequate cardiac output.
Answer choice B: Intravenous nitroprusside infusion, is incorrect.
Nitroprusside reduces afterload and may improve forward flow in selected patients with preserved blood pressure. However, this patient is profoundly hypotensive. Vasodilator therapy could precipitate cardiovascular collapse.
Answer choice C: Large-volume intravenous normal saline administration, is incorrect.
This patient is markedly volume overloaded, as demonstrated by elevated filling pressures, pulmonary edema, and peripheral edema. Additional fluids would worsen pulmonary congestion without correcting the underlying pump failure. This answer choice is attractive because hypotension often suggests hypovolemia. However, the pulmonary artery catheter data clearly indicate excessive filling pressures rather than volume depletion.
Answer choice D: Norepinephrine infusion as sole therapy, is incorrect.
Norepinephrine is often used when severe hypotension threatens coronary or cerebral perfusion. However, it primarily increases vascular tone and does not adequately address the profound reduction in cardiac output demonstrated by the low cardiac index. If used, norepinephrine is frequently combined with an inotrope rather than used as isolated therapy in severe pump failure.
Answer choice E: Urgent hemodialysis, is incorrect.
The acute kidney injury is a consequence of cardiogenic shock and renal hypoperfusion. Although renal replacement therapy may eventually be required, the immediate priority is restoration of cardiac output and organ perfusion.
Key Learning Point
Pulmonary artery catheter data can distinguish shock states. Cardiogenic shock is characterized by elevated filling pressures, low cardiac output, and compensatory elevation of systemic vascular resistance. In patients with severe systolic dysfunction and hypoperfusion, inotropic support such as dobutamine is often required to improve cardiac output and restore end-organ perfusion.
