All of the following statements about chronic constrictive pericarditis are true except
**Core Concept**
Chronic constrictive pericarditis is a condition where the pericardium, a fibrous sac surrounding the heart, becomes thickened and scarred, leading to impaired diastolic filling of the heart. This results in a restrictive cardiomyopathy, characterized by a stiff pericardium that restricts the heart's ability to expand and fill with blood.
**Why the Correct Answer is Right**
The correct answer will be a statement that accurately describes the pathophysiology or clinical presentation of chronic constrictive pericarditis. Chronic constrictive pericarditis is often associated with a history of tuberculosis, which can lead to pericardial scarring and fibrosis. The condition can also be caused by other inflammatory or infectious processes, such as rheumatoid arthritis or malignancy.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it may not be true for all cases of chronic constrictive pericarditis. While it is true that the pericardium is often thickened and scarred in this condition, it is not a universal finding.
**Option B:** This option is incorrect because it may not be true for all cases of chronic constrictive pericarditis. While a history of tuberculosis is a common association, it is not the only possible cause of this condition.
**Option C:** This option is incorrect because it may not be true for all cases of chronic constrictive pericarditis. While a restrictive cardiomyopathy is a characteristic feature of this condition, it is not the only possible cardiac abnormality that can occur.
**Clinical Pearl / High-Yield Fact**
A key clinical feature of chronic constrictive pericarditis is the presence of a pericardial knock, a distinctive heart sound that occurs due to the rapid closure of the tricuspid valve as the ventricle tries to fill with blood against the resistance of the constricted pericardium.
**Correct Answer: D**