Below is an instruction from Human. Write a response.
    ### Instruction:
    Who is at risk for Heart Block? ?
    ### Response:
    The risk factors for congenital and acquired heart block are different.
                
Congenital Heart Block
                
If a pregnant woman has an autoimmune disease, such as lupus, her fetus is at risk for heart block.
                
Autoimmune diseases can cause the body to make proteins called antibodies that can cross the placenta.
    