Characteristic cardiac lesion in SLE is:
## **Core Concept**
Systemic Lupus Erythematosus (SLE) is a chronic autoimmune disease that can affect multiple organ systems, including the cardiovascular system. Cardiac involvement in SLE can manifest in various ways, including pericarditis, myocarditis, and Libman-Sacks endocarditis. The characteristic cardiac lesion associated with SLE is Libman-Sacks endocarditis.
## **Why the Correct Answer is Right**
Libman-Sacks endocarditis is a form of non-bacterial endocarditis characterized by the presence of sterile vegetations on heart valves. It is strongly associated with SLE and antiphospholipid syndrome. These vegetations can occur on either side of the valve leaflets and are composed of immune complexes, platelets, and fibrin. The condition can lead to embolic events and is a significant cause of morbidity in patients with SLE.
## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because while pericarditis is a common cardiac manifestation of SLE, it is not the most characteristic lesion.
- **Option B:** This option is incorrect as myocarditis, although it can occur in SLE, is not specific or characteristic enough to be the defining cardiac lesion.
- **Option C:** This option might seem plausible but is not the correct answer because the specific and characteristic cardiac lesion in SLE is more accurately described by another option.
## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that Libman-Sacks endocarditis is often associated with antiphospholipid antibodies, which are also seen in antiphospholipid syndrome. This condition increases the risk of thrombotic events and recurrent miscarriages. The presence of cardiac vegetations in a patient with SLE should prompt testing for antiphospholipid antibodies.
## **Correct Answer:** D. Libman-Sacks endocarditis.