Author/Editor		Bošnjak, R; Kordaš, M
Title		Circulatory effects of internal jugular vein compression: a computer simulation study
Type		članek
Source		Med Biol Eng Comput
Vol. and No.		Letnik 40, št. 4
Publication year		2002
Volume		str. 423-31
Language		eng
Abstract		The effects of compression of the internal jugular veins and the inferior vena cava are simulated using an equivalent electronic circuit, which included simulation of cardiocirculatory phenomena and special features of the cerebral circulation. Compression of the inferior vena cava resulted in a profound decrease in cardiac output (from 4.5 to 1.51 min-1 and arterial pressure (from 140/85 to 50l35mmHg). Compression of the internal jugular veins resulted in a negligible decrease in cardiac output and arterial pressure, with a cerebral blood flow that was slightly decreased. Cerebral capillary and internal jugular pressures were considerably increased, leading to obstruction of cerebral veins and increased pressure (from 9 to 22mmHg) and volume (from 120 to 145m1) of the cerebrospinal fluid (CSF). Increased cerebral capsule,compliance resulted in decreased CSF pressure (from 9 to 8.5mm Hg), but CSF volume increased (from 120 to 190ml). A small increase in brain volume (from 1000ml to 1060ml, 6% volume increase) was compensated for by an equal decrease in the volume of CSF. When brain volume was above 1080ml, the absorption of CSF was reduced, and its pressure increased.
Descriptors		CEREBROVASCULAR CIRCULATION JUGULAR VEINS VENA CAVA, INFERIOR COMPUTER SIMULATION CARDIAC OUTPUT BLOOD PRESSURE VENOUS INSUFFICIENCY