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Abstract #49175 Published in IGR 14-1

Cardiac autonomic dysfunction in patients with normal tension glaucoma: 24-h heart rate and blood pressure variability analysis

Wierzbowska J; Wierzbowski R; Stankiewicz A; Siesky B; Harris A
British Journal of Ophthalmology 2012; 96: 624-628

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AIMS: To define parameters of autonomic nervous system activity in patients with normal tension glaucoma (NTG). METHODS: Ambulatory 24-h ECG (Lifecard CF) and 24-h blood pressure (BP) monitoring (SpaceLab 90207-30) were carried out in 54 patients with NTG (44 women, mean age 59.7) and 43 matched control subjects (34 women, mean age 57.0). Heart rate variability time and frequency domain parameters (low frequency (LF), high frequency (HF) and LF/HF ratio), BP variability (BPV), diurnal and nocturnal BP variables were compared between study groups. RESULTS: Patients with NTG demonstrated higher LF, LF/HF and lower HF values than control subjects for the 24-h, daytime and night-time periods. The mean 24-h, daytime and night-time LF/HF ratios were statistically higher in patients with glaucoma as compared to control subjects ((3.2±1.5 vs 2.2±0.8, p=0.0009), (3.5±1.7 vs 2.7±1.0, p=0.0173) and (2.6±1.7 vs 1.4±0.6, p=0.0001), respectively). There were no statistical differences in the mean BP during the whole day, daytime and night-time, and in BPV (10.4±1.9 vs 10.5±2.1, p=0.790) between study groups. No difference was also found in the percentage decrease in night-time mean BP (12.3% vs 13.6%, p=0.720). 'Dippers', 'non-dippers' and 'overdippers' with NTG showed significantly higher LF/HF ratio as compared to the same subgroups of control subjects. CONCLUSIONS: The sympathovagal balance of autonomic nervous system in patients with NTG shifted towards sympathetic activity however with no change of 24-h pattern of BPV as compared to controls.

Department of Ophthalmology, Military Institute of Medicine, 128 Szaserów Str. 04-141 Warsaw 44, Poland. joanna.wierzbowska@gmail.com

Full article

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Classification:

9.2.4 Normal pressure glaucoma (Part of: 9 Clinical forms of glaucomas > 9.2 Primary open angle glaucomas)
6.11 Bloodflow measurements (Part of: 6 Clinical examination methods)

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