The drugs given to HIV-positive pregnant women can cause significant long-term heart problems for the non-HIV-infected babies they carry says a new study. Such medicines help prevent the transmission of the virus from mother to infant but may cause impaired development of heart muscle and reduced heart performance in non-HIV-infected children. What our study indicates is that there is potentially a long-term price to be paid for protecting the children of HIV-infected mothers from the virus' said Steven E. Lipshultz pediatrician at the Children's Hospital of Michigan in the US and chair of pediatrics for the Wayne State University School