Welcome to PPHNet Online, the web home of the Pediatric Pulmonary Hypertension Network. This web site is part of our organization’s effort to improve outcomes for children with PH. Here you will find information about PH and related disorders, a list of clinical centers with contact information, and reports about current and emerging research topics, as well as other features. We are glad you have come to the site and hope the information you find here is of use.