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Difficulty: MediumPharmacologic Interventions

A 68-year-old man is evaluated in the intensive care unit for persistent hypotension. He was admitted 12 hours ago for severe community-acquired pneumonia and was empirically started on intravenous ceftriaxone and azithromycin. His medical history includes hypertension, type 2 diabetes mellitus, and stage 3a chronic kidney disease. Since admission, he has received a total of 4 liters of intravenous lactated Ringer solution. His current vital signs are temperature 38.6°C (101.5°F), blood pressure 80/52 mmHg (mean arterial pressure 61 mmHg), heart rate 118/min, and respiratory rate 22/min. Oxygen saturation is 94% on a high-flow nasal cannula. Bedside echocardiography demonstrates hyperdynamic left ventricular function and a distended inferior vena cava with minimal respiratory variation. Urine output over the past 4 hours has been 15 mL/hr. Which of the following is the most appropriate next pharmacologic intervention?

  1. Initiate an intravenous norepinephrine infusionAnswer
  2. B
    Initiate an intravenous dopamine infusion
  3. C
    Initiate an intravenous dobutamine infusion
  4. D
    Administer intravenous hydrocortisone
  5. E
    Administer an additional 1 L bolus of lactated Ringer solution

Answer

Initiate an intravenous norepinephrine infusion
This patient is experiencing septic shock that remains refractory to adequate fluid resuscitation, as evidenced by persistent hypotension (mean arterial pressure <65< 65 mmHg) despite receiving 4 liters of crystalloid. The bedside echocardiogram showing a distended inferior vena cava with minimal respiratory variation indicates that he is no longer fluid-responsive (volume replete). The most appropriate next step in management is the initiation of a vasopressor. Norepinephrine is the first-line vasopressor of choice for septic shock due to its potent alpha-1 adrenergic agonist effects, which increase systemic vascular resistance, and modest beta-1 adrenergic effects, which help maintain cardiac output without causing significant tachycardia.

Step-by-Step Solution

1
Assess the patient's hemodynamic status and response to initial therapy.
The patient has a mean arterial pressure of 61 mmHg despite receiving 4 liters of intravenous crystalloids.
Determines if the patient remains in shock and whether initial fluid resuscitation was sufficient.
2
Interpret bedside echocardiography findings.
A distended inferior vena cava with minimal respiratory variation indicates the patient is no longer fluid-responsive. A hyperdynamic left ventricle indicates adequate cardiac contractility.
Guides the choice between additional fluids, inotropes, or vasopressors.
3
Select the most appropriate pharmacologic intervention based on the assessment.
Norepinephrine infusion is selected as the first-line vasopressor.
Current guidelines mandate the use of norepinephrine as the initial vasopressor for fluid-refractory septic shock to achieve a target mean arterial pressure of 65 mmHg or greater.

Key Concept

In patients with septic shock who remain hypotensive despite adequate fluid resuscitation, intravenous norepinephrine is the first-line vasopressor of choice to maintain adequate perfusion.
Estimated Time:1m 30s
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Pharmacologic Interventions

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