The SaO2/t diagram as a useful means to express nocturnal hypoxemia.
The computerization of SaO2 recording during polysomnographic monitoring allows the construction of a diagram expressing the percentage of TIB spent at different steps in saturation. We studied the value of this diagram in three groups of male patients: (1) nine healthy subjects (all volunteers); (2) 25 patients with COPD who had a mean daily SaO2 of 92.3 +/- 1.3 percent; and (3) 25 patients with SAS who had a mean daily SaO2 of 92.1 +/- 1.4 percent. The results show the existence of a discriminating quality in the diagram's morphology, the existence of strong correlations (p less than 0.01) between the percentage of TIB spent at SaO2 less than 85 percent, and the total duration of the desaturation dips.
Aubry
P
P
Service de Pneumologie et Unité de Réanimation Respiratoire, Chu-Hôpital Sud, Amiens, France.
Jounieaux
V
V
Rose
D
D
Duran
A
A
Levi-Valensi
P
P
D000368:Aged; D003627:Data Interpretation, Statistical; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000503:physiopathology*; D008297:Male; D008838:Microcomputers; D008875:Middle Aged; D010101:Oxygen Consumption / Q000502:physiology; D011659:Pulmonary Gas Exchange / Q000502:physiology*; D012891:Sleep Apnea Syndromes / Q000503:physiopathology*