Right ventricular dysfunction secondary to pulmonary disease — most often chronic hypoxic pulmonary disease.
Also known as: cor pulmonale, right heart failure, pulmonary heart disease
Overview
Right ventricular structural and functional changes (hypertrophy, dilation, and ultimately failure) caused by disease of the lung parenchyma, pulmonary vasculature, ventilation, or chest wall. By convention, RV dysfunction due to left heart disease, primary cardiomyopathy, or congenital heart disease is NOT considered cor pulmonale.
Epidemiology
Most commonly results from chronic obstructive pulmonary disease (COPD), accounting for ~80% of cases. Other causes include interstitial lung disease, obesity hypoventilation syndrome, chronic thromboembolic pulmonary hypertension (CTEPH), high-altitude exposure, and chest wall disorders. Prevalence rises with COPD severity.
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Question 1CardiovascularMedium
A 66-year-old man with severe COPD develops worsening edema, elevated jugular venous pressure, and hepatomegaly. Which of the following best explains the mechanism?
ATricuspid valve endocarditis with regurgitation
BPulmonary hypertension causing right ventricular strain
CLeft ventricular systolic failure backing up into the lungs
DRestrictive filling from pericardial constriction
Reveal answer & full explanation
Correct answer: B — Pulmonary hypertension causing right ventricular strain
ATricuspid valve endocarditis with regurgitation
BPulmonary hypertension causing right ventricular strain✓
CLeft ventricular systolic failure backing up into the lungs
DRestrictive filling from pericardial constriction
Why Pulmonary hypertension causing right ventricular strain is correct
Chronic hypoxia in severe COPD triggers pulmonary vasoconstriction and remodeling, raising pulmonary artery pressure.
Sustained pressure overload produces right ventricular hypertrophy and failure (cor pulmonale).
The JVD, hepatomegaly, and peripheral edema are classic right-sided congestion from this pathway.
Why the others are wrong
Left ventricular systolic failure backing up into the lungs — Left heart failure would dominate with pulmonary edema and orthopnea, and is not the primary COPD pathway to isolated right-sided signs; this is a wrong-side heart-failure trap.
Restrictive filling from pericardial constriction — Constriction can mimic right-sided congestion but is unrelated to COPD and lacks the lung-disease link; this is a same-signs different-cause trap.
Tricuspid valve endocarditis with regurgitation — Endocarditis would present with fever, a murmur, and emboli, none described here; this is an infectious-mimic trap.
Question 2CardiovascularMedium
A 58-year-old woman presents with two years of progressive exertional dyspnea and lower extremity edema. She has no history of smoking, COPD, or interstitial lung disease, and reports a remote provoked deep vein thrombosis after a fracture. Exam shows elevated jugular venous pressure, a right ventricular heave, and a loud P2. Transthoracic echocardiography demonstrates a dilated, hypokinetic right ventricle with an estimated pulmonary artery systolic pressure of 62 mmHg and normal left ventricular size and function. Pulmonary function testing and high-resolution chest CT are unremarkable. Which of the following is the most appropriate next diagnostic test?
AVentilation-perfusion scan
BCT pulmonary angiography
CLeft heart catheterization
DCardiac MRI with gadolinium
Reveal answer & full explanation
Correct answer: A — Ventilation-perfusion scan
AVentilation-perfusion scan✓
BCT pulmonary angiography
CLeft heart catheterization
DCardiac MRI with gadolinium
Why Ventilation-perfusion scan is correct
In unexplained pulmonary hypertension without parenchymal lung disease, the next step is to screen for chronic thromboembolic pulmonary hypertension (CTEPH), a potentially curable cause suggested here by a prior venous thromboembolism.
The V/Q scan is the screening test of choice for CTEPH because it is highly sensitive, and a normal study effectively excludes the diagnosis. Segmental mismatched perfusion defects point toward CTEPH and prompt confirmation with pulmonary angiography and right heart catheterization.
CTEPH matters because pulmonary endarterectomy is potentially curative in operable disease.
Why the others are wrong
CT pulmonary angiography is sensitive for acute, central PE but can miss the distal, organized, web-like disease of CTEPH; V/Q is the preferred and more sensitive screen for this indication.
Cardiac MRI with gadolinium characterizes RV size, function, and infiltrative cardiomyopathy but does not screen for the thromboembolic disease the history most suggests.
Left heart catheterization evaluates coronary and left-sided disease, but the echo shows isolated right ventricular dysfunction with a normal left ventricle, making left-sided disease an unlikely driver.
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Pulmonary arterial hypertension (when it leads to RV failure, terminology varies but functional impact is similar)
Pathophysiology
Chronic alveolar hypoxia → hypoxic pulmonary vasoconstriction (an adaptive response intended to match perfusion to ventilation in local areas but maladaptive when global). Persistent vasoconstriction plus structural vascular remodeling and rarefaction of the pulmonary capillary bed elevate pulmonary vascular resistance. The RV initially hypertrophies in response to increased afterload but progressively dilates and fails as PA pressures and resistance climb. Hypercapnia and acidemia further amplify pulmonary vasoconstriction. Polycythemia from chronic hypoxia increases blood viscosity and worsens the burden on the RV.
Clinical presentation
Symptoms
Exertional dyspnea and fatigue (the underlying lung disease usually predominates early)
Exertional or syncopal episodes (advanced)
Lower extremity edema, abdominal bloating, early satiety, anorexia
Right upper quadrant discomfort from hepatic congestion
Signs / physical exam
Elevated JVP with prominent V wave (TR), Kussmaul sign in some cases
Right ventricular heave (parasternal lift)
Loud P2, fixed or paradoxical split S2 in some cases
Right-sided S3 or S4 gallop
Holosystolic murmur of tricuspid regurgitation at the LLSB, increased with inspiration (Carvallo sign)
Clubbing, cyanosis, and other features of the underlying lung disease (e.g., barrel chest in COPD)
Classic findings
Severe COPD patient with elevated JVP, lower extremity edema, and loud P2 — RV failure superimposed on chronic lung disease.
Differential diagnosis
Left-sided heart failure with secondary pulmonary venous hypertension — Elevated LV filling pressures on echo, history of HTN/CAD; PCWP >15 mmHg on RHC distinguishes
Pulmonary arterial hypertension (PAH, WHO Group 1) — Often younger patient, idiopathic or connective tissue disease association; precapillary by RHC; treated with PAH-specific therapies
Constrictive pericarditis — Equalization of diastolic pressures, pericardial thickening on CT/MRI; can mimic right HF
Thyroid studies, HIV, autoimmune serologies if PAH etiology uncertain
Imaging
Transthoracic echocardiography — estimates RV size, function, and pulmonary artery systolic pressure via tricuspid regurgitation jet; assesses for left heart disease
ECG: right axis deviation, right ventricular hypertrophy, P-pulmonale (peaked P waves >2.5 mm in II, III, aVF), RBBB, right atrial enlargement
CXR: enlarged pulmonary arteries (right descending PA >16 mm), prominent RV, oligemic peripheral lung fields ('pruning'); features of underlying lung disease (hyperinflation, fibrosis)
High-resolution CT chest if interstitial lung disease suspected
V/Q scan to screen for chronic thromboembolic pulmonary hypertension (CTEPH) — preferred over CTPA
Polysomnography if OSA suspected
Right heart catheterization — gold standard; defines pulmonary hemodynamics (mean PAP, PCWP, PVR, cardiac output) and distinguishes pre- from post-capillary pulmonary hypertension
Diagnostic algorithm
Feature
Cor Pulmonale
Left-Sided HF
Underlying disease
Lung parenchyma, vasculature, or thoracic cage
CAD, HTN, valvular, cardiomyopathy
JVP
Elevated, prominent V wave
Elevated
Lung exam
Wheezing, decreased breath sounds, or fibrotic crackles
Bibasilar fine crackles, pleural effusion
Echo
Dilated RV, normal LV, elevated PASP, normal PCWP
Dilated/dysfunctional LV, elevated PCWP
Pulmonary HTN type
Group 3 (lung disease) or 4 (CTEPH)
Group 2 (left heart disease)
Mortality-reducing therapy
Long-term oxygen (when criteria met)
GDMT (ACEi/ARNI, beta-blocker, MRA, SGLT2i)
Distinguishing cor pulmonale from left-sided heart failure.
Treatment
First-line
Treat the underlying lung disease aggressively — this is the cornerstone of management
Long-term oxygen therapy (LTOT) is the single intervention shown to reduce mortality in COPD-related cor pulmonale; indicated for resting PaO2 ≤55 mmHg or SpO2 ≤88%, or PaO2 56-59 / SpO2 ≤89% with cor pulmonale, polycythemia, or peripheral edema. Target SpO2 88-92% in COPD
Treat OSA with CPAP / BiPAP; obesity hypoventilation with NIV
Diuretics (furosemide, torsemide) for volume overload — use cautiously to avoid reducing preload too aggressively in a preload-dependent failing RV
Second-line / adjunct
Anticoagulation for CTEPH (chronic warfarin or DOACs); pulmonary endarterectomy is potentially curative in operable disease, with riociguat or balloon pulmonary angioplasty for inoperable CTEPH
PAH-specific therapy (endothelin receptor antagonists, PDE5 inhibitors, prostacyclins, guanylate cyclase stimulators) is NOT recommended for cor pulmonale from hypoxic lung disease and may worsen V/Q mismatch and oxygenation; reserved for confirmed WHO Group 1 PAH
Phlebotomy considered for hematocrit >55-65% with symptomatic hyperviscosity
Lung transplantation for end-stage disease unresponsive to medical management
Tricuspid regurgitation and dilation of the IVC and hepatic veins
Congestive hepatopathy and cardiac cirrhosis
Syncope, especially with exertion
Polycythemia with thromboembolic complications
PANCE pearls
Cor pulmonale is RV dysfunction due to LUNG disease — RV failure from left heart disease, congenital lesions, or primary RV cardiomyopathy is excluded by definition.
Long-term oxygen therapy is the only intervention proven to improve survival in COPD-related cor pulmonale.
PAH-specific therapies (endothelin antagonists, PDE5 inhibitors, prostacyclins) can worsen oxygenation in cor pulmonale from hypoxic lung disease by impairing hypoxic vasoconstriction and worsening V/Q mismatch.
P-pulmonale (peaked P waves >2.5 mm in II, III, aVF) signifies right atrial enlargement.
Always evaluate for chronic thromboembolic disease (CTEPH) in unexplained pulmonary hypertension — V/Q scan is the screening test of choice and CTEPH is potentially curable with pulmonary endarterectomy.
References
ESC/ERS 2022 — 2022 ESC/ERS Guidelines for the Diagnosis and Treatment of Pulmonary Hypertension (Humbert et al., Eur Heart J 2022)
GOLD 2024 — Global Initiative for Chronic Obstructive Lung Disease (GOLD) 2024 Report
NOTT and MRC trials — Continuous or Nocturnal Oxygen Therapy in Hypoxemic Chronic Obstructive Lung Disease (NOTT, Ann Intern Med 1980); MRC Long-term Domiciliary Oxygen Trial (Lancet 1981)
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