Congenital hea block develops in fetuses of women suffering from
**Core Concept**
Congenital heart block refers to a condition where there is a disruption in the normal electrical conduction between the heart's atria and ventricles, leading to abnormal heart rhythms. This condition is often associated with autoimmune disorders that affect the mother, such as lupus or rheumatoid arthritis, which can cause the production of antibodies that attack the fetal heart.
**Why the Correct Answer is Right**
In the case of congenital heart block, the mother's autoimmune disorder can lead to the production of antibodies that target the fetal heart, specifically the cardiac conduction system. These antibodies can bind to the fetal heart and disrupt the normal electrical conduction, leading to heart block. The most common antibody associated with congenital heart block is the anti-Ro (SS-A) antibody, which is often present in women with lupus or rheumatoid arthritis.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because congenital heart block is not typically associated with maternal diabetes.
**Option B:** This option is incorrect because congenital heart block is not typically associated with maternal hypertension.
**Option C:** This option is incorrect because congenital heart block is not typically associated with maternal anemia.
**Clinical Pearl / High-Yield Fact**
Women with autoimmune disorders, such as lupus or rheumatoid arthritis, should be screened for anti-Ro (SS-A) and anti-La (SS-B) antibodies during pregnancy to identify those at risk of congenital heart block.
**Correct Answer:** C.