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- W2108981521 abstract "Autonomic dysfunction and sleep apnoea are frequent complications of chronic renal failure. Since nocturnal hypoxaemia in sleep apnoea dampens autonomic reflexes, we postulated that altered autonomic control is in part linked to nocturnal hypoxaemia in uraemic patients.To test the hypothesis we performed continuous monitoring of O(2) saturation during night by pulse oximetry (Ohmeda-Biox) as well as echocardiography, 24-h ambulatory blood pressure monitoring, and standard tests of autonomic function in 50 patients on chronic dialysis (40 on haemodialysis and 10 on CAPD). For haemodialysis patients all studies were performed during a mid-week non-dialysis day.Twenty-five patients had at least one episode of nocturnal hypoxaemia (median 13, interquartile range 4-31) while the other 25 patients had no episodes at all. Minimal and average SaO(2) were strongly interrelated (r = 0.64, P = 0.0001). In a multiple regression model, besides age, average nocturnal SaO(2) was the only independent predictor of the parasympathetic function. Similarly, average nocturnal SaO(2) was the only independent predictor of the autonomic response to standing. Sex, 24-h mean arterial pressure, body mass index, haematocrit, serum albumin, serum parathyroid hormone and duration of dialysis treatment had no independent effect on the autonomic tests. Interestingly, the average nocturnal SaO(2) and the interaction between the responses to the autonomic tests were independently related to posterior-wall thickness. This interaction term represented also the stronger independent predictor of the relative wall thickness of the left ventricle. In a multiple logistic regression model the interaction parasympathetic-sympathetic function was the only independent predictor of concentric remodelling or hypertrophy, while average nocturnal SaO(2) entered into this model (P = 0.03) only after exclusion of the autonomic function interaction term.Thus, altered cardiovascular autonomic control appears to be linked to nocturnal hypoxaemia and to concentric hypertrophy or remodelling in dialysis patients. Since nocturnal hypoxaemia is an established cardiovascular risk factor, altered autonomic control is a potential mechanism whereby hypoxaemia may trigger cardiovascular events in dialysis patients. It remains to be seen whether the link between nocturnal hypoxaemia and autonomic dysfunction is a causal one." @default.
- W2108981521 created "2016-06-24" @default.
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- W2108981521 date "2001-01-01" @default.
- W2108981521 modified "2023-09-25" @default.
- W2108981521 title "Autonomic neuropathy is linked to nocturnal hypoxaemia and to concentric hypertrophy and remodelling in dialysis patients" @default.
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- W2108981521 doi "https://doi.org/10.1093/ndt/16.1.70" @default.
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