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Difficulty: Very hardInitial Stabilization and Triage

A rapid response team is activated for a 73-year-old woman who collapsed on the orthopedic ward. She is on postoperative day 8 following a right total hip arthroplasty. Upon arrival, the patient is profoundly lethargic, responding only to painful stimuli with incomprehensible groans. She is severely diaphoretic and has mottled extremities. Vital signs are temperature 37.6°C (99.7°F), blood pressure 62/40 mm Hg, heart rate 138/min, and respiratory rate 36/min. Pulse oximetry is 83% despite receiving 15 L/min of oxygen via a non-rebreather mask. Physical examination reveals jugular venous distention up to the angle of the mandible. Lung auscultation is clear bilaterally. Bedside point-of-care ultrasound demonstrates a massively dilated right ventricle with apical sparing, paradoxical motion of the interventricular septum into the left ventricle during systole, and an underfilled left ventricle. No pericardial effusion is present. The team prepares to intervene. Which of the following is the most appropriate immediate next step in the stabilization of this patient?

  1. A
    Transport the patient immediately for computed tomography pulmonary angiography
  2. B
    Administer a rapid 2-liter intravenous bolus of 0.9% sodium chloride
  3. Initiate a continuous intravenous infusion of norepinephrineAnswer
  4. D
    Administer intravenous broad-spectrum antibiotics and draw blood cultures
  5. E
    Administer an induction dose of propofol and perform endotracheal intubation

Answer

Initiate a continuous intravenous infusion of norepinephrine
The correct action is to initiate a continuous intravenous infusion of norepinephrine. This patient is presenting with obstructive shock due to a massive pulmonary embolism, evidenced by hypotension, severe hypoxemia, jugular venous distention, and classic point-of-care ultrasound findings (right ventricular dilation and septal bowing). The right ventricle (RV) is failing against massive afterload. Because the RV is perfused by the right coronary artery, which depends on an adequate aortic root pressure, systemic hypotension leads to RV ischemia, worsening RV failure in a vicious cycle. Norepinephrine increases mean arterial pressure and restores RV coronary perfusion. While the patient's deteriorating mentation and hypoxia make airway protection necessary, hemodynamics must be optimized first ('resuscitate before you intubate').

Step-by-Step Solution

1
Analyze the clinical presentation and physical exam.
The patient has sudden cardiovascular collapse, hypoxia, clear lungs, and severe jugular venous distention 8 days after major orthopedic surgery.
These findings are highly specific for obstructive shock, most likely due to a massive pulmonary embolism.
2
Interpret the bedside ultrasound findings.
The ultrasound confirms a massively dilated right ventricle, a compressed left ventricle, and paradoxical septal motion (McConnell's sign and ventricular interdependence).
This confirms that the primary physiological threat is acute right ventricular failure leading to decreased left ventricular preload and systemic hypotension.
3
Evaluate competing resuscitation priorities (Airway vs. Circulation).
Although the patient is hypoxic and lethargic (normally indications for intubation), establishing hemodynamic stability must take precedence.
Intubating a patient in unresuscitated right ventricular failure is highly dangerous. Positive pressure ventilation increases intrathoracic pressure (reducing venous return), and induction agents decrease sympathetic tone. This combination routinely causes peri-intubation cardiac arrest.
4
Determine the most appropriate initial stabilization step.
Initiation of a vasopressor (norepinephrine or epinephrine) is required immediately.
Vasopressors increase systemic vascular resistance and mean arterial pressure, which is necessary to maintain the perfusion gradient to the thick, failing right ventricle before securing the airway or administering thrombolytics.

Key Concept

In massive pulmonary embolism with obstructive shock, immediate hemodynamic stabilization with vasopressors must precede endotracheal intubation to prevent cardiovascular collapse.
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Topics

Initial Stabilization and Triage

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