Objective: We hypothesized that the effect of intermittent and continuous hypoxia on carotid and brachial artery intima-media thicknesses (IMTs) may be similar. We aimed to assess the carotid and brachial arteries’ IMTs in cases with intermittent [obstructive sleep apnea syndrome] (OSAS) and continuous (chronic obstructive pulmonary disease) [COPD] hypoxemia together with other confounding demographic and biochemical factors.
Methods: The study was prospectively performed on 197 patients allocated in three groups: 80 patients with severe OSAS, 80 severe COPD patients and 37 healthy controls. These groups were compared in terms of demographics, biochemical markers and IMTs of the right and left carotid and brachial arteries.
Results: Carotid and brachial arterial IMTs were found to be higher in both patient groups than the contro group (p < 0.001). Similarly, levels of haemoglobin, haematocrit, cholesterol, triglycerides, LDL, CRP and D-dimer were significantly increased in patient groups. Oxygen saturations (p < 0.001) and ejection fractions (p = 0.001) were found to be worse and D-dimer levels (p = 0.010) were elevated more prominently in COPD patients; whereas, cholesterol (p < 0.001), haemoglobin (p = 0.004) and LDL (p = 0.001) levels were higher in OSAS group. Except the right carotid IMT, which was increased significantly in OSAS patients, IMT measurements were similar in OSAS and COPD groups (p < 0.001).
Conclusion: We have shown that both intermittent and continuous hypoxia result in remarkable alterations in carotid-IMT and brachial-IMT. Further prospective trials are warranted to confirm and extend these findings including the biochemical markers, which may aid in the diagnosis and follow-up of patients suffering from hypoxaemia.
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