FCEM2-0598

You are with a mountain expedition group and have moved from an altitude of 3380m to 3760 metres over the past two days. One of your group members, who is in their 50s, has become increasingly breathless over the past 6 hours and is now breathless at rest and has started coughing up blood stained sputum. The patient’s observations are shown below:

Blood pressure 148/94 mmHg
Pulse 128 bpm
Respiration rate 30 bpm
Oxygen saturations 84% on air

What is the likely diagnosis?