A novel BMPR2 mutation in a patient with heritable pulmonary arterial hypertension and suspected hereditary hemorrhagic telangiectasia A case report

Rationale: BMPR2mutation is the most common cause of heritable pulmonary arterial hypertension (HPAH), but rare in hereditary hemorrhagic telangiectasia (HHT).ACVRL1,ENGandSMAD4are the most common gene mutations reported in HPAH with HHT. Patient concerns: We report a 11-year-old boy with a definite diagnosis of pulmonary hypertension and suspected HHT with recurrent epistaxis. The results of gene detection showed that there was a nosense mutation inBMPR2. The results of gene detection ofACVRL1, ENGandSMAD4were normal. Diagnoses: Heritable pulmonary arterial hypertension with suspected hereditary hemorrhagic telangiectasia. Interventions: Patient was treated with ambrisentan 2.5 mg qd. About a month later, the patient developed massive gastrointestinal bleeding and sudden convulsions. The patient's vital signs were stable after symptomatic treatment. Outcomes: After discharging from hospital, the patients continued to take ambrisentan. No epistaxis or gastrointestinal bleeding was found in one month of follow-up, but the symptoms of chest tightness were not significantly alleviated. Lessons: BMPR2with a nonsense mutation is more likely to cause HPAH with HHT and are more likely to be life-threatening.