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

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

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

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.”

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