Ideally, pulmonary arterial hypertension (PAH) should be diagnosed as early as possible so that patients can begin treatment.
The early symptoms of PAH – breathlessness, dizziness and fatigue – are often mild, and are common to many other conditions. Diagnosis can be delayed for months or even years while other possible causes are investigated, and as a result, PAH is frequently only identified when it is already quite advanced.
It is difficult to diagnose PAH purely on the basis of symptoms, and there is no single test for the condition. Diagnosis is usually based on a medical history and a series of investigations that are designed to measure heart and lung function and to rule out other conditions. These can include:
If PAH is suspected, a diagnosis can be confirmed using a procedure called right heart catheterisation. This involves inserting a small tube into the heart to give a direct measure of pressure in the heart and lungs. This test usually involves a short stay in hospital.