_:vb50947534 . _:vb50947534 . _:vb50947534 . _:vb50947534 . _:vb50947534 . _:vb50947534 "A lung disease characterized by inadequate gas exchange by the respiratory system."^^ . _:vb50947534 "url:http://en.wikipedia.org/wiki/Respiratory_failure"^^ .