You are invited to participate in a voluntary research study of the EchoSense Doppler Technology at CHOP. The objective of this study is to evaluate the Lung Doppler Signals non-invasively in children with pulmonary hypertension. We will correlate these signals to the values typically obtained from a heart catheterization. Our target enrollment is 30 patients. There are no significant risks associated with participating, and the study should take approximately 20 minutes to complete. As stated above, this study is completely voluntary, and you have the right to withdrawl at any time, and If you refuse to participate, this will not impact with the medical care you will receive. IRB 15-012495