Cor Pulmonale and Heart Failure: Key Differences and Clinical Implications

Definition and Pathophysiology

The American College of Cardiology defines heart failure as a complex clinical syndrome resulting from any structural or functional cardiac disorder that impairs the ventricle's ability to fill with or eject blood, manifesting as dyspnea, fatigue, and fluid retention 1, 2, 3
The majority of heart failure cases stem from impaired left ventricular myocardial function due to coronary artery disease, hypertension, or dilated cardiomyopathy, as stated by the American College of Cardiology 1, 2, 3
Heart failure can result from disorders of the pericardium, myocardium, endocardium, valves, or great vessels, according to the American College of Cardiology 2, 4
The European Respiratory Journal notes that cor pulmonale develops through hypoxic pulmonary vasoconstriction, mechanical narrowing of vessels, and obstruction of the pulmonary vascular bed, with the right ventricle becoming enlarged and eventually failing due to increased afterload from pulmonary hypertension (mean pulmonary artery pressure >25 mmHg at rest) 5
Pulmonary hypertension in cor pulmonale is associated with obesity hypoventilation syndrome in 30-88% of cases, and these patients have significantly increased perioperative mortality, as reported by the European Heart Journal 6

The American Journal of Respiratory and Critical Care Medicine recommends echocardiography for patients with COPD who have signs of congestive heart failure or concerning symptoms to differentiate between left heart failure and cor pulmonale 7
The European Respiratory Journal notes that patients with severe lung disease may have pulmonary hypertension evident even at rest, which typically worsens during exercise, with pulmonary vascular resistance remaining constant or rising (unlike normal subjects where it falls) 5
The American College of Cardiology states that patients with chronic lung disease often have coexisting left heart disease due to shared risk factors (smoking, age, inactivity), creating diagnostic complexity 1, 2, 4
The American College of Cardiology prefers the term "heart failure" over "congestive heart failure" because not all patients have volume overload at presentation, applying to both left heart failure and cor pulmonale 1, 2, 4