Objective: To explore the regulation of hypothalamus-pituitary-adrenal (HPA) axis and growth hormone (GH) axis in obstructive sleep apnea-hypopnea syndrome (OSAHS).
Methods: OSAHS patients (OSAHS group) and subjects with obesity alone (control group) were monitored by polysomnography (PSG). The corticotropin-releasing hormone (CRH), growth hormone releasing hormone (GHRH), corticotropin (ACTH), cortisol and growth hormone levels in plasma were measured by enzyme-linked immunosorbent assay (ELISA) and radioimmunoassay before and after sleep. Their correlation were analyzed.
Results: The CRH concentration [(1.66 +/- 0.34), (4.96 +/- 0.98) mmol/L before and after sleep] and cortisol content [(152.93 +/- 136.15), (445.53 +/- 123.09) microg/L before and after sleep] in the OSAHS group were significantly higher than those of the control group [CRH was (0.67 +/- 0.42), (2.27 +/- 1.10) mmol/L, cortisol concentration was (68.94 +/- 20.13), (146.05 +/- 30.48) microg/L, before and after sleep, respectively, all P < 0.01]; GHRH significantly decreased in the OSAHS group [(1.42 +/- 0.07), (1.01 +/- 0.05) mmol/L before and after sleep] compared with the control group [(1.99 +/- 0.34), (1.58 +/- 0.15) mmol/L, respectively; all P < 0.01]; but there was no difference in growth hormone. The ratio of the variation of CRH, GHRH level (DeltaCRH/DeltaGHRH) was significantly higher in the OSAHS group (285.02 +/- 143.32) than that in the control group (71.15 +/- 15.37, P < 0.01). The bivariate correlation analysis of the OSAHS group indicated that DeltaCRH/DeltaGHRH was correlated positively with average awake duration (r = 0.882), but negatively with average blood oxygen concentration (r = -0.696). The average blood oxygen concentration was negatively correlated with average awake duration (r = -0.729).
Conclusions: There are abnormal changes of HPA axis and GH axis in OSAHS patients, and the feedback regulation is disordered. These abnormalities are related to sleep structure variation and hypoxia during sleep.
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