Dr. Gary Stapleton is a pediatric cardiologist practicing in Saint Petersburg, FL. Dr. Stapleton specializes in caring for fetuses, infants, children and adolescents with cardiovascular or cardiac abnormalities. Practiced in both inpatient and outpatient settings, the scope of conditions cared for by pediatric cardiologists is large and includes congenital heart defects, heart muscle disorders, rhythm disturbances and hypertension.