Cor Pulmonale: Clinical Features and Diagnosis

Introduction

Definition: Cor pulmonale is right ventricular (RV) dysfunction or failure secondary to pulmonary hypertension caused by diseases of the lungs, pulmonary vasculature, or chest wall (❌ not due to left-sided heart disease).

Clinical Presentation

1. Symptoms

Early / Compensated stage

• Dyspnea on exertion (most common)
• Fatigue, reduced exercise tolerance
• Chest discomfort (due to RV ischemia)
• Palpitations
• Syncope or presyncope (suggests severe pulmonary hypertension)

Late / Decompensated stage (Right heart failure)

• Peripheral edema (ankles → generalized)
• Abdominal distension, ascites
• Right upper quadrant pain (hepatic congestion)
• Anorexia, early satiety
• Oliguria (low cardiac output)

2. Signs (Physical Examination)

General

• Central cyanosis (chronic hypoxemia)
• Clubbing (if underlying chronic lung disease)
• Cachexia (advanced COPD)

Cardiovascular

• Raised JVP (prominent a wave)
• Parasternal heave (RV hypertrophy)
• Loud P2 (pulmonary hypertension)
• Right-sided S3 or S4
• Tricuspid regurgitation murmur (holosystolic, ↑ with inspiration – Carvallo sign)

Respiratory

• Signs of underlying lung disease:
  • Wheeze (COPD, asthma)
  • Crackles (ILD)
  • Reduced breath sounds

Abdomen & Peripheral

• Hepatomegaly (tender)
• Ascites
• Bilateral pitting edema

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Diagnostic Criteria for Cor Pulmonale

Core Concept (VERY IMPORTANT FOR EXAMS)

You must prove 2 things:1️⃣ Pulmonary hypertension2️⃣ Right ventricular dysfunctionAND exclude left heart disease

1. Evidence of Pulmonary Hypertension

Echocardiography (first-line, non-invasive)

• Elevated estimated pulmonary artery systolic pressure (PASP)
• RV hypertrophy or dilation
• Interventricular septal flattening (“D-shaped LV”)
• Tricuspid regurgitation

Right Heart Catheterization (Gold Standard)

• Mean pulmonary artery pressure (mPAP) ≥ 20 mmHg
• Pulmonary capillary wedge pressure (PCWP) ≤ 15 mmHg→ confirms pre-capillary PH

2. Evidence of Right Ventricular Dysfunction

Echocardiography

• RV dilation
• Reduced TAPSE (<17 mm)
• Reduced RV fractional area change

ECG

• Right axis deviation
• P pulmonale (peaked P in II)
• RV hypertrophy
• RBBB

Chest X-ray

• Enlarged right heart border
• Prominent pulmonary arteries
• Underlying lung pathology

3. Evidence of Underlying Lung / Pulmonary Disease

Depending on cause:

• COPD → hyperinflation, ↓ DLCO
  • DLCO = Diffusing Capacity of the Lung for Carbon Monoxide, a test of gas transfer across the alveolar-capillary membrane.
• ILD → restrictive pattern
• Pulmonary embolism → CT pulmonary angiography
• OSA → sleep study

4. Exclusion of Left-Sided Heart Disease (MANDATORY)

❌ No LV systolic or diastolic dysfunction ❌ No significant mitral or aortic valve disease ❌ Normal PCWP on right heart cath

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Common Causes (High-yield)

Chronic

• COPD (most common)
• Interstitial lung disease
• Obstructive sleep apnea
• Pulmonary hypertension (Group 3)
• Kyphoscoliosis

Acute (Acute cor pulmonale)

• Massive pulmonary embolism
• Severe ARDS
• Acute severe asthma

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One-line Exam Diagnosis Statement

“Cor pulmonale is diagnosed by evidence of pulmonary hypertension with right ventricular dysfunction caused by lung or pulmonary vascular disease, in the absence of left-sided heart disease.”

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Exam Pearls

✅ Loud P2 = pulmonary hypertension ✅ Edema + JVP + dyspnea + COPD = think cor pulmonale ❌ LV failure = NOT cor pulmonale ⭐ Gold standard for PH = right heart catheterization