Abstract
STUDY OBJECTIVES: No consensus exists regarding monitoring the initiation of positive airway pressure (PAP) by oximetry. A PAP device report may be insufficient to ensure a good therapeutic response in all patients. This study aimed to identify patients who would potentially benefit from oximetry monitoring during PAP initiation. METHODS: PAP initiation was routinely monitored at home with an oximeter. Data were reviewed for all patients who underwent PAP initiation in 2015, including a baseline sleep study and PAP initiation data. Group A included patients with an apnea-hypopnea index as determined from the PAP device (AHI(PAP)) of < 5 events/h and a residual 3% oxygen desaturation index (ODI(3)) of ≥ 10 events/h. Group B included all remaining patients. Cases with a leak of over 24 L/min or with an oximetry recording time of < 1 hour were excluded. AHI(PAP) < 5 events/h and residual ODI(3) < 10 events/h represented good PAP responses. RESULTS: From 787 patients, 723 were included in this study. Among these, 158 had an AHI(PAP) of ≥ 5 events/h, whereas 565 had an AHI(PAP) of < 5 events/h. Group A consisted of 129 patients (18%). The sensitivity of the PAP device indicating a good PAP response reached 93.1%, with a specificity of 37.2%, a negative predictive value of 96.2%, and a positive predictive value of 23.9% using body mass index (BMI) ≥ 30 kg/m(2) and baseline SpO(2) < 92% as the cutoff points. CONCLUSIONS: Relying only on the PAP device parameter to evaluate therapeutic responses provided inconsistent results in one-fifth of cases. Thus, oximetry monitoring during PAP initiation is recommended when baseline SpO(2) < 92% or when BMI ≥ 30 kg/m(2). Otherwise, oximetry monitoring remains optional.