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Objective To evaluate the impact of oxidative stress and cellular adhesion molecules on ischemic reactive hyperemia (IRH) in patients with OSA. Materials and MethodsConsecutive patients treated at a sleep laboratory and whose polysomnography showed an apnea hypopnea index (AHI) " 5 were included in the study. Patients with acute illness receiving vasoactive medications were excluded. Based on their oxygen desaturation index (ODI), subjects were assigned to the mild-moderate (ODI !30) or the severe desaturation group (ODI >30). Then IRH and oxidative stress markers [malondialdehyde (MDA)] and proinflammatory markers (ICAM-1 and P-selectin) were measured. Results Sixty-eight subjects with OSA were included, 31 in the mild-moderate desaturation group and 37 in the severe group. No differences by age, gender and body mass index were observed. The severe desaturation group showed significantly higher values in the AHI, MDA, ICAM-1 and P-selectin (p<0.005), as well as a worsening of IRH (p=0.001). Only ICAM-1 (p=0.019) and P-selectin (p=0.033) were independently associated with IRH in a multiple-linear regression model. Conclusion Patients with OSA and greater intermittent hypoxia showed worse endothelial function, and higher levels of MDA, ICAM-1 and P-selectin. Nevertheless, ICAM-1 and P-selectin rather than MDA were independently associated with IRH.

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In our setting, the follow-up control of LTOT and therapeutic compliance were not optimal. The SpO2 shows a good correlation with the PaO2 and represents a good alternative for the follow-up control of LTOT.

The FSI-10 is a useful instrument for assessing the degree of satisfaction of asthmatic patients regarding available inhalation devices. It is easy to understand and complete, and able to identify differences in patient satisfaction with the different inhalers.