TB involvement of the heart leading to constrictive pathology is called

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When TB affects the heart in a way that makes the pericardium stiff and scarred, it creates a situation where the heart cannot fill properly during diastole. This is called constrictive pericarditis. The inflammatory process from TB can progress to thickening and sometimes calcification of the pericardium, which limits the heart’s expansion and impairs ventricular filling, leading to signs of venous congestion and edema.

This is different from a pericardial effusion, where the main issue is fluid accumulation in the pericardial space; from pericarditis, which is acute inflammation of the pericardium; and from myocarditis, which is inflammation of the heart muscle itself. Constrictive pericarditis specifically refers to the restrictive, noncompliant pericardium that preserves pressure but limits volume, causing diastolic dysfunction.