Accuracy of Wrist-worn Pulse Oximeter SpO2 Measurements in Patients Diagnosed With Pulmonary Hypertension
The goal of this study is to learn how accurate smartwatches are at measuring oxygen levels in patients with a condition called pulmonary hypertension. The main questions it aims to answer are: * How accurate the smartwatches are at measuring oxygen levels when the patient is sitting at rest * How accurate are smartwatches at measuring oxygen levels after exercise * How accurate are smartwatches at measuring oxygen levels after breathing a lower level of oxygen through a mask. Researchers will compare oxygen levels measured through a smartwatch with those checked through a finger probe oxygen monitor and also from a blood sample checked from the artery in the wrist to see if smartwatch oxygen measurements are similar. Participants will: -Attend the hospital once, just for a few hours to collect all the required data.
• Aged 18-years old and above.
• Diagnosed with pulmonary hypertension by right heart catheterisation showing a baseline mean pulmonary artery pressure \> 20mmHg, PVR \>2 Woods Units.
• Able to perform a six-minute walk test (6MWT)
• Able to give written informed consent.