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Zorluk: OrtaCardiovascular System

A 68-year-old man comes to the clinic due to a three-week history of progressively worsening swelling in his legs and an uncomfortable sensation of abdominal fullness. He also notes increased shortness of breath when walking up a flight of stairs. His medical history is significant for a 45-pack-year smoking habit and chronic bronchitis. His current medications include inhaled tiotropium and as-needed albuterol.

Vital signs show a blood pressure of 128/78 mm Hg, a heart rate of 88/min, a respiratory rate of 18/min, and an oxygen saturation of 87% on room air.

Physical examination reveals an elevated jugular venous pressure of 12 cm H2O. Auscultation of the lungs demonstrates scattered expiratory wheezing but no crackles. Cardiac examination shows a parasternal heave and a loud pulmonic component of the second heart sound. The abdomen is distended with a palpable, tender liver edge. Bilateral pitting edema is present up to the knees.

An echocardiogram demonstrates right ventricular hypertrophy and dilation, with an estimated pulmonary artery systolic pressure of 55 mm Hg. The left ventricular ejection fraction is 60%, and there are no left-sided valvular abnormalities.

Which of the following interventions is most likely to prolong this patient's survival?

  1. A
    Initiation of daily oral furosemide
  2. B
    Initiation of oral lisinopril therapy
  3. Initiation of long-term supplemental oxygen therapyCevap
  4. D
    Addition of inhaled fluticasone to his regimen
  5. E
    Initiation of oral metoprolol succinate therapy

Cevap

Initiation of long-term supplemental oxygen therapy
The patient presents with clinical and echocardiographic evidence of cor pulmonale, which is right-sided heart failure secondary to pulmonary disease. His chronic bronchitis has caused severe resting hypoxemia (oxygen saturation of 87%). Chronic alveolar hypoxia leads to hypoxic pulmonary vasoconstriction, elevating pulmonary artery pressures and causing the right ventricle to undergo compensatory hypertrophy and eventual dilation/failure. Long-term supplemental oxygen therapy (LTOT) is the only intervention among the choices that actively reverses hypoxic vasoconstriction and has been unequivocally proven to improve survival in patients with COPD who have resting hypoxemia (SaO2 ≤ 88% or PaO2 ≤ 55 mm Hg), or evidence of right heart failure with SaO2 ≤ 89%.

Adım Adım Çözüm

1
Analyze the patient's symptoms, physical exam, and imaging findings.
The patient has signs of right-sided heart failure (elevated JVP, hepatomegaly, peripheral edema) with an echocardiogram showing right ventricular hypertrophy/dilation and pulmonary hypertension, but normal left ventricular function.
This establishes the diagnosis of cor pulmonale, secondary to severe chronic obstructive pulmonary disease (COPD).
2
Evaluate the patient's vital signs and oxygenation status.
The oxygen saturation is persistently low at 87% on room air.
Identifying severe resting hypoxemia is crucial for determining the next best step in managing COPD with complications.
3
Determine which treatment provides a mortality benefit for this specific pathophysiological state.
Long-term supplemental oxygen therapy is identified as the intervention that improves survival.
In cor pulmonale driven by COPD, reversing hypoxic pulmonary vasoconstriction with supplemental oxygen is the only definitive way to halt the progression of pulmonary hypertension and improve long-term survival.

Anahtar Kavram

Management of Cor Pulmonale and severe COPD
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Konular

Cardiovascular System

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