11th May 2025

A 43-year-old woman presents with a history of progressive dyspnoea and fatigue on exertion, alongside increased ankle swelling.

A 43-year-old woman presents with a history of progressive dyspnoea and fatigue on exertion, alongside increased ankle swelling. She denies orthopnoea. On examination you note a loud P2, right ventricular heave and raised JVP. Following appropriate investigations, she is diagnosed with pulmonary hypertension. Which of the following investigations can be used as a prognostic marker in patients with pulmonary hypertension? 

Select the SINGLE most appropriate option from the list below. Select ONE option only.