Pulmonology · Pulmonary Hypertension
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Cor pulmonale is defined as right ventricular hypertrophy (RVH) and subsequent right-sided heart failure resulting from pulmonary hypertension caused by primary lung disease.
Chronic obstructive pulmonary disease (COPD) is the most common underlying cause of cor pulmonale in the developed world.
Physical examination reveals a loud pulmonic component of the second heart sound (P2) and a parasternal heave due to right ventricular pressure overload.
Patients frequently present with peripheral edema, jugular venous distension (JVD), and hepatomegaly secondary to systemic venous congestion.
The gold standard for definitive diagnosis and measurement of pulmonary artery pressures is right heart catheterization.
Echocardiography is the initial diagnostic test of choice to demonstrate right ventricular dilation and elevated pulmonary artery systolic pressure.
Management focuses on treating the underlying lung pathology and providing supplemental oxygen to reduce hypoxic pulmonary vasoconstriction.
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A 68-year-old male with a 50-pack-year smoking history presents with progressive dyspnea and worsening lower extremity swelling. On physical exam, he has a barrel chest, distant breath sounds, and a parasternal heave. Cardiac auscultation reveals a loud P2 and a holosystolic murmur at the left sternal border. Laboratory studies show polycythemia, and an ECG demonstrates right axis deviation and RVH.
What is the most likely diagnosis?
Cor pulmonale
The patient's history of COPD combined with signs of right-sided heart failure (peripheral edema, JVD, parasternal heave, loud P2) is classic for cor pulmonale, which is tested by the association between chronic lung disease and right ventricular dysfunction.
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Etiology / Epidemiology
Caused by chronic obstructive pulmonary disease (COPD) leading to pulmonary hypertension. Right-sided heart failure secondary to lung pathology.
Clinical Manifestations
Presents with peripheral edema, jugular venous distension (JVD), and a parasternal heave. Signs of underlying lung disease are universal.
Diagnosis
Right heart catheterization is the gold standard. Mean pulmonary artery pressure >20 mmHg confirms pulmonary hypertension.
Treatment
Treat the underlying lung disease. Oxygen therapy is the primary intervention. Avoid diuretics unless peripheral edema is severe.
Prognosis
Poor prognosis once failure develops. 5-year survival is significantly reduced compared to isolated lung disease.
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Epidemiology & Etiology
Most commonly caused by COPD, followed by interstitial lung disease and chronic pulmonary thromboembolism. It represents an alteration in the structure or function of the right ventricle due to primary respiratory disorders. It is distinct from left-sided heart failure or congenital heart disease.
Pertinent Anatomy
The right ventricle is a thin-walled chamber designed for low-pressure pulmonary circulation. Increased afterload from pulmonary hypertension causes right ventricular hypertrophy (RVH) and eventual dilation. This leads to tricuspid regurgitation and systemic venous congestion.
Pathophysiology
Chronic hypoxia causes pulmonary vasoconstriction, leading to vascular remodeling and increased pulmonary vascular resistance. The right ventricle fails to compensate for this sustained high afterload. This results in decreased cardiac output and systemic venous backup.
Clinical Manifestations
Patients present with exertional dyspnea, fatigue, and syncope. Physical exam reveals JVD, a loud pulmonic component of S2, and a right-sided S3. Red flags include resting hypoxia and severe peripheral edema indicating decompensated failure.
Diagnosis
The Right heart catheterization is the definitive diagnostic tool. Echocardiogram is the initial screening test to estimate pulmonary artery systolic pressure. Mean pulmonary artery pressure >20 mmHg at rest is the diagnostic threshold.
Treatment
Management focuses on optimizing lung function with Oxygen therapy to reduce hypoxic vasoconstriction. Use diuretics cautiously to manage volume overload, but avoid aggressive diuresis as the right ventricle is preload-dependent. Treat underlying infections or exacerbations of COPD.
Prognosis
The prognosis is largely dictated by the severity of the underlying pulmonary disease. Right ventricular failure is a major predictor of mortality. Patients require regular monitoring of oxygen saturation and pulmonary pressures.
Differential Diagnosis
Left-sided heart failure: elevated pulmonary capillary wedge pressure
Constrictive pericarditis: Kussmaul sign present
Pulmonary embolism: acute onset vs chronic progression
Tricuspid regurgitation: primary valvular pathology
Cirrhosis: systemic edema without pulmonary hypertension