The purpose of this study was to evaluate the acute effects of oxygen supplementation during a submaximal exercise test in patients with Eisenmenger's Syndrome.

Patients with Eisenmenger's syndrome were submitted to a submaximal exercise test (six-minute walking test) with and without supplemental oxygen. The distance walked during the two tests were compared to assess the impact of oxygen supplementation on the walking distance.

Inclusion Criteria:

• Abscence of heart failure and/or respiratory infection
• Advanced therapy for pulmonary hypertension

Exclusion Criteria:

• Lung, liver or connective tissue diseases
• Neuromuscular diseases
• Inability to perform a pulmonary function test and/or chronic lung disease
• Inability to walk

No participant data will be shared. However, all enrolled subjects were provided the principal investigator's phone number and e-mail address in order to receive test results and ask questions.