Final answer:
The most common etiology of constrictive pericarditis is tuberculosis.
Step-by-step explanation:
Constrictive pericarditis is a condition characterized by the thickening and scarring of the pericardium, the thin sac-like membrane surrounding the heart. As the pericardium becomes rigid and loses its elasticity, it restricts the normal movement of the heart, impairing its ability to fill with blood properly during the cardiac cycle. The most common etiology of constrictive pericarditis is tuberculosis.
Tuberculosis (TB) is a bacterial infection caused by Mycobacterium tuberculosis. It primarily affects the lungs but can also affect other parts of the body. TB is a contagious disease, and it spreads through the air when an infected person coughs or sneezes.