Contribution of pulse oximetry in relation to respiratory ﬂow events in a home-based approach aimed at diagnosing obstructive sleep apnea.
Objective
To compare pulse oximetry with manual analysis against all signals of respiratory polygraphy.


Material and Methods
This retrospective study estimated sensitivity (S), specificity (Sp) and positive/negative likelihood ratio (LR+/-) of the oxygen desaturation index (ODI-test) and apnea-hypopnea index (AHI-reference).


Results
3854 patients (61.5% men) were included. Age, BMI, Epworth sleepiness scale and AHI were: 55 years (44-65), 30.9kg/m2 (27-36), 7 points (4-11), and 14 events/hour (6-25), respectively. 18% showed an AHI <5 events/hour, 34% = 5 and <15, 27% = or > 15 and < 30, and 31% > 30. The S, Sp, and LR+/- of ODI for AHI = 5 events/hour was 93%, 92%, 12 and 0.08 with an accuracy of 93%. For AHI = 15 events/hour, the values were: S 94%, Sp 94%, LR+ 15 and LR- 0.06 and 94% accuracy (r(2) Spearman: 0.92).


Conclusion
In a population at a high risk for OSA, home-based pulse oximetry had a diagnostic accuracy > 90% when is compared against all respiratory signals obtained from simpliﬁed home sleep testing.
['Borsini|Eduardo Enrique|EE|', 'Blanco|Magali|M|', 'Ernst|Glenda|G|', 'Salvado|Alejandro|A|', 'Bledel|Ignacio|I|', 'Nigro|Carlos Alberto|CA|']
Oximetry Diagnosis Sleep Apnea Syndrome