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Zorluk: OrtaCardiovascular System

A 62-year-old woman is brought to the emergency department due to sudden onset of severe shortness of breath and lightheadedness. She underwent a right total hip arthroplasty 10 days ago. Her temperature is 37.1°C (98.8°F), blood pressure is 76/48 mm Hg, pulse is 128/min, and respirations are 28/min. Pulse oximetry shows 87% on room air. Physical examination reveals a patient in severe respiratory distress. The jugular venous pressure is estimated at 13 cm H2O. Auscultation of the lungs reveals clear breath sounds bilaterally. Cardiac auscultation reveals a regular tachycardia and a prominent P2, but no murmurs or gallops. The right lower extremity is mildly swollen and tender to palpation compared to the left. Which of the following is the most appropriate next step in the management of this patient?

  1. Bedside transthoracic echocardiographyCevap
  2. B
    Computed tomography pulmonary angiography
  3. C
    Intravenous administration of furosemide
  4. D
    Intravenous administration of broad-spectrum antibiotics
  5. E
    Measurement of serum D-dimer concentration

Cevap

Bedside transthoracic echocardiography
The correct answer is bedside transthoracic echocardiography. This patient's sudden-onset severe dyspnea, clear lungs, elevated jugular venous pressure, and hypotension 10 days after major orthopedic surgery are highly suggestive of a massive pulmonary embolism (PE) causing right ventricular failure and obstructive shock. In a hemodynamically unstable patient with suspected massive PE, transport to the radiology department for a computed tomography (CT) pulmonary angiography is highly unsafe. Instead, bedside transthoracic echocardiography is the most appropriate next step. It can rapidly identify signs of acute right ventricular dysfunction (e.g., right ventricular dilation, tricuspid regurgitation, McConnell's sign) to support the diagnosis of massive PE and justify the administration of immediate thrombolytic therapy if no contraindications exist.

Adım Adım Çözüm

1
Evaluate the patient's hemodynamic status and synthesize the clinical presentation.
The patient has obstructive shock (hypotension, tachycardia) and acute right heart strain (elevated JVP, prominent P2) 10 days after major orthopedic surgery, which strongly indicates a massive pulmonary embolism.
Identifying hemodynamic instability is the critical branch point in the pulmonary embolism treatment algorithm.
2
Determine the safest initial diagnostic modality for a hemodynamically unstable patient.
Select bedside transthoracic echocardiography.
Transporting unstable patients for definitive imaging like CT pulmonary angiography is strictly contraindicated due to the high risk of fatal decompensation away from resuscitation equipment.

Anahtar Kavram

In hemodynamically unstable patients with a high clinical suspicion for massive pulmonary embolism, bedside transthoracic echocardiography is the most appropriate initial diagnostic step to identify right ventricular dysfunction, as transporting the patient for a CT scan is unsafe.
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