Question: What are the complications of Polycystic Kidney Disease ?
Answer: Babies with the most severe cases of autosomal recessive PKD often die hours or days after birth because they cannot breathe well enough to sustain life. Their lungs do not develop as they should during the prenatal period. Pressure from enlarged kidneys also contributes to breathing problems. Children born with autosomal recessive PKD often develop kidney failure before reaching adulthood. Liver scarring occurs in all people with autosomal recessive PKD and is usually present at birth. However, liver problems tend to become more of a concern as people with autosomal recessive PKD grow older. Liver scarring can lead to progressive liver dysfunction and other problems. Additional complications of autosomal recessive PKD include high blood pressure and UTIs.
Source: NIDDK

Question: How to prevent Polycystic Kidney Disease ?
Answer: Scientists have not yet found a way to prevent PKD. However, people with PKD may slow the progression of kidney damage caused by high blood pressure through lifestyle changes, diet, and blood pressure medications. People with PKD should be physically active 30 minutes a day most days of the week. See Eating, Diet, and Nutrition for diet advice on lowering blood pressure and slowing the progression of kidney disease in general. If lifestyle and diet changes do not control a persons blood pressure, a health care provider may prescribe one or more blood pressure medications, including ACE inhibitors or ARBs.
Source: NIDDK