Author/Editor		Zaletel, M; Žvan, B; Pretnar, J; Pogačnik, T
Title		The evidence of intracranial sympathetic activity: a TCD study
Type		članek
Source		In: Stalberg EV, de Weerd AW, Zidar J, editors. ECCN 98. 9th European congress of clinical neurophysiology; 1998 Jun 4-7; Ljubljana. Bologna: Monduzzi editore,
Publication year		1998
Volume		str. 195-8
Language		eng
Abstract		Sympathetic nervous system (SNS) enervates cerebral vessels. Activation of SNS does not significantly change cerebral blood flow, however, it shifts the limits of autoregulation and produces vasoconstriction of great cerebral vessels at the base of brain. Transcranial Doppler (TCD) is the method with which we are able to detect constriction of middle cerebral artery at an unchanged cerebral blood flow. Cold pressure test (CPT) and head up tilt (HUT) evoke generalized activation of SNS. Mean arterial pressure (MAP) is a marker for peripheral vascular sympathetic activity, while the activity of intracranial sympathetic may be followed by mean arterial velocity (Vm) in the middle cerebral arteries using TCD. We found an association between MAP and Vm during CPT and HUT. It seems, that the activity of intracranial SNS is detectable by measuring Vm using TCD during CPT and HUT.
Descriptors		ULTRASONOGRAPHY, DOPPLER, TRANSCRANIAL BLOOD FLOW VELOCITY BRAIN CEREBRAL ARTERIES SYMPATHETIC NERVOUS SYSTEM CEREBROVASCULAR CIRCULATION HEART RATE