Synopsis
Distinguish two pulmonary vascular complications of portal hypertension, confirm each with the right test, and coordinate cardiopulmonary optimisation with liver-transplant decisions.
- Hepatopulmonary syndrome combines liver disease or portal hypertension, intrapulmonary vascular dilatation and an objectively demonstrated oxygenation defect.
- Platypnoea and orthodeoxia favour hepatopulmonary syndrome because upright posture increases blood flow through basal dilated pulmonary vessels.
- Agitated-saline contrast appearing in the left heart after a delayed passage supports intrapulmonary shunting; immediate passage suggests an intracardiac communication.
- Portopulmonary hypertension is pulmonary arterial hypertension associated with portal hypertension and requires right-heart catheterisation for haemodynamic confirmation.
- Echocardiography is a screening and right-heart assessment tool; it cannot by itself distinguish precapillary disease from high-output or volume-overloaded states.
- Supplemental oxygen supports hypoxaemic hepatopulmonary syndrome, but liver transplantation is the only established treatment capable of reversing the underlying vascular syndrome.
- Portopulmonary hypertension treatment belongs in a designated pulmonary-hypertension service because drug selection, hepatic metabolism and transplant thresholds are tightly linked.
- Both conditions can occur without a direct relationship to conventional liver-test severity, so persistent unexplained dyspnoea deserves purposeful investigation.
Key red flags
Exertional dyspnoea, chest pressure, presyncope or syncope, ankle swelling and declining exercise capacity suggest right-ventricular stress and require specialist investigation.
Sudden hypoxaemia, pleuritic pain or rapid right-heart deterioration is not a routine evolution of either syndrome; investigate pulmonary embolism, infection, fluid overload and bleeding urgently.
Investigation priorities
Screen for hypoxaemia and document a clinically relevant postural change.
Management branches
A person with liver disease or portal hypertension has unexplained dyspnoea, low saturation or orthodeoxia.
- Measure saturation with posture, obtain a properly documented room-air arterial blood gas where safe, and investigate common lung, cardiac, anaemic and thromboembolic explanations in parallel.
- Arrange agitated-saline contrast echocardiography through an experienced service, interpreting delayed left-sided bubbles as evidence of intrapulmonary vascular passage in the correct clinical context.
- Provide oxygen when clinically indicated and refer early to the liver-transplant team because disease-modifying therapy, severity classification and selection exceptions require specialist assessment.