has part has part characteristic of inheres in has modifier respiratory gaseous exchange by respiratory system Hypoventilation HP:0002791 UMLS:C3203358 Alveolar hypoventilation HP:0004892 Not to be confused with Hypopnea, where the partial pressure of carbon dioxide can remain normal. Slow breathing SNOMEDCT_US:15993004 SNOMEDCT_US:80954004 Respiratory depression Under breathing SNOMEDCT_US:31515003 A reduction in the amount of air transported into the pulmonary alveoli by breathing, leading to hypercapnia (increase in the partial pressure of carbon dioxide). UMLS:C0235063 Abnormal pattern of respiration decreased frequency abnormal pathological