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T1  - Heart Rate Variability in Head-Up Tilt Tests in Adolescent Postural Tachycardia Syndrome Patients 
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UR  - http://hdl.handle.net/10138/319598 
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A1  - Orjatsalo, Maija; Alakuijala, Anniina; Partinen, Markku 
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Y1  - 2020 
LA  - eng 
AB  - Introduction:Postural tachycardia syndrome (POTS) is a suspected dysautonomia with symptoms of orthostatic intolerance and abnormally increased heart rate while standing. We aimed to study cardiac autonomic nervous system functioning in head-up tilt (HUT) in adolescents with POTS to find out if parasympathetic tone is attenuated in the upright position. Methods:We compared characteristics of a group of 25 (females 14/25; 56%) adolescents with POTS and 12 (females 4/12; 34%) without POTS aged 9-1... 
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KW  - postural tachycardia syndrome; adolescent; head-up tilt test; autonomic nervous system; heart rate variability; SYMPATHETIC-NERVE ACTIVITY; ORTHOSTATIC INTOLERANCE; BAROREFLEX; PARAMETERS; DISORDERS; CHILDREN; VALUES; POTS; TIME; 3112 Neurosciences; 3124 Neurology and psychiatry 
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