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Soru

Zorluk: ZorCardiovascular System

A 65-year-old woman is evaluated in the hospital on postoperative day 2 following an elective total right knee arthroplasty due to sudden-onset palpitations, severe shortness of breath, and lightheadedness. Her medical history includes hypertension, type 2 diabetes mellitus, and chronic obstructive pulmonary disease. Her temperature is 37.9°C (100.2°F), blood pressure is 82/50 mm Hg, heart rate is 148/min, and respiratory rate is 26/min. Pulse oximetry is 91% on 2 L/min of oxygen via nasal cannula. On physical examination, the patient appears distressed and diaphoretic. Her extremities are cool to the touch with delayed capillary refill. Jugular venous distension is present. Lung auscultation reveals bibasilar crackles and scattered expiratory wheezes. Cardiac examination shows an irregularly irregular rhythm with a rapid rate and no distinct murmurs. The right knee surgical site is intact with expected mild swelling and no purulent drainage. An electrocardiogram demonstrates an irregularly irregular rhythm with narrow QRS complexes and absent P waves. Which of the following is the most appropriate immediate next step in management?

  1. Synchronized direct current cardioversionCevap
  2. B
    Intravenous metoprolol administration
  3. C
    Intravenous furosemide and albuterol nebulization
  4. D
    Computed tomography pulmonary angiography
  5. E
    Blood cultures and empiric broad-spectrum antibiotics

Cevap

Synchronized direct current cardioversion
The correct answer is synchronized direct current cardioversion. This patient is experiencing atrial fibrillation with a rapid ventricular response. Her clinical presentation—marked hypotension (82/50 mm Hg), poor peripheral perfusion (cool, clammy extremities), and acute decompensated heart failure (crackles, elevated jugular venous pressure)—indicates that she is hemodynamically unstable as a direct result of the tachyarrhythmia. According to Advanced Cardiovascular Life Support (ACLS) guidelines, the most appropriate and immediate life-saving intervention for any patient with a tachyarrhythmia causing hemodynamic instability is synchronized direct current cardioversion to restore sinus rhythm and cardiac output.

Adım Adım Çözüm

1
Analyze the patient's vital signs and perfusion status to determine hemodynamic stability.
The patient is hypotensive (82/50 mm Hg) with signs of end-organ hypoperfusion (cool, clammy extremities, diaphoresis, altered mentation/lightheadedness) and acute heart failure (pulmonary edema).
Determining hemodynamic stability is the critical first branch point in the management of any acute arrhythmia.
2
Interpret the electrocardiogram (ECG) and physical exam findings.
The irregularly irregular rhythm with narrow QRS complexes and absent P waves confirms atrial fibrillation with a rapid ventricular response.
Identifying the specific rhythm guides the definitive intervention and rules out other causes of shock.
3
Apply the Advanced Cardiovascular Life Support (ACLS) guidelines for unstable tachyarrhythmias.
The patient requires immediate electrical intervention rather than pharmacological therapy.
Synchronized direct current cardioversion is the immediate treatment of choice to restore sinus rhythm, improve diastolic filling, and reverse cardiogenic shock in unstable patients.

Anahtar Kavram

Patients presenting with a tachyarrhythmia and signs of hemodynamic instability (hypotension, altered mental status, shock, ischemic chest pain, or acute heart failure) require immediate synchronized direct current cardioversion.
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Cardiovascular System

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