Zastosowanie testu pionizacyjnego i podciśnienia wokół dolnej połowy ciała w badaniach odruchowej regulacji krążenia u ludzi

Abstract

The aim of this paper is to present methods applied in analysis of tolerance to gravitational acceleration (±Gz) changes and diagnostics of the dysfunction of the autonomic nervous system (ANS) concerning cardiovascular system adaptation to the vertical body position.The head-up tilt test (HUT), head-down tilt test (HDT), and lower body negative/positive (LBNP/LBPP) pressure are widely used for evaluation of integrated ANS reflexes.Due to its simplicity, ease of application and full control over the level of excitation, HUT has become a frequently used clinical test in orthostatic hypotony.LBNP is widely used in aviation medicine to study cardiovascular regulation. In clinics, the method is applied as a reliable procedure to study results of the shift of physiological fluids in the head-legs direction. Due to the supine patient position during the test, muscle contraction (pump) and vestibular influences can be avoided and a pure cardiovascular reflex is observed.Abrupt and/or fast repeatable changes in the direction of gravitational acceleration (±Gz) can result in loss of consciousness (G-LOC). Recent results suggest that tolerance to +Gz is reduced when preceded by HDT (-Gz) (push-pull effect).