Respiratory acidosis Acute respiratory acidosis 2013-11-24T01:11:51Z HP:0012467 SNOMEDCT_US:70644008 Sudden onset of impairment in ventilation such that the removal of carbon dioxide by the respiratory system is less than the production of carbon dioxide in the tissues, leading to an elevation of the partial pressure of carbon dioxide (PaCO2) above the normal limits (more than 45 mm Hg) with an accompanying acidemia (pH less than 7.35). UMLS:C0268047