Abstract
Autonomic dysfunction is commonly detected in patients with multiple sclerosis (MS). However, data evaluating autonomic nervous system function in early MS are limited. Present study investigates response to two different stressors in newly diagnosed MS patients, looking for the signs of autonomic dysfunction at the beginning of the disease. We examined 19 MS patients and 19 age, sex, and body mass index matched healthy controls. MS patients were newly diagnosed, untreated, and with low expanded disability status scale (EDSS) values [median 1.0 (interquartile range 1.0–1.5)]. Two stressors were used to evaluate the response of autonomic nervous system: Stroop word-color interference mental stress test and orthostasis. Plasma levels of epinephrine and norepinephrine, blood pressure (BP), and heart rate variability (HRV) parameters were evaluated. At the end of Stroop test MS patients had lower systolic BP (121 ± 15 vs. 132 ± 17 mmHg, p = 0.044), lower heart rate (79 ± 9 vs. 88 ± 16 1/min, p = 0.041), and lower epinephrine increment (10 ± 22 vs. 30 ± 38 pg/ml; p = 0.049) compared to healthy controls. Norepinephrine response was unaffected in MS, however, with lower norepinephrine levels during the test (p = 0.036). HRV parameters were similar in both groups. No differences in BP, heart rate, catecholamines, and HRV parameters between groups during orthostatic testing were found. We found slightly diminished sympathetic response to mental stress test, but unchanged response to orthostasis, in newly diagnosed untreated MS patients. The results suggest that autonomic dysfunction in MS is connected with more developed disease.
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Acknowledgements
This work was supported by the Slovak Research and Development Agency (Grant APVV-0028-10), Grant agency of Ministry of Education, Science, Research and Sport (VEGA 2/0161/16), and ERA net NEURON II (MELTRA-BBB).
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The authors’ responsibilities were as follow: AP, BK, and DJ conceived and designed the study; MV, AP, RI, MMe, MMr, LG, AG, and MS contributed to sample and data collection and data analysis; MV and AP wrote the manuscript; MV, RI, PT, BK, and DJ researched data and contributed to the discussion. All authors reviewed and edited the manuscript.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Vlcek, M., Penesova, A., Imrich, R. et al. Autonomic Nervous System Response to Stressors in Newly Diagnosed Patients with Multiple Sclerosis. Cell Mol Neurobiol 38, 363–370 (2018). https://doi.org/10.1007/s10571-017-0511-3
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DOI: https://doi.org/10.1007/s10571-017-0511-3