[Pial vessel reactions in acute hypertension--an intravital microscopic study and its clinical relevance to traumatic brain oedema (author's transl)].
A fluorescence-angiographic investigation is presented of pital vessel reactions to acute drug-induced hypertension in cats. Observations and documentation were carried out by an intravital-microscopic technique. Acute hypertension, where pressure values of 220 to 260 mm Hg were reached within 10 to 20 sec, was followed by marked vasodilatation: Arterioles under 50 mu in diameter and capillaries were dilated to between 200 to 300% of the resting diameter, whilst arterioles of 50 to 100 mu showed an increase of 50 to 60%. Reddening of veins and acceleration of the blood flow occurred. Vasodilatation persisted after the blood pressure values had returned to normal. In connexion with investigations of the blood pressure immediately after a head injury, the role of acute hypertension in the development of hydrostatic brain oedema is discussed.
D000208:Acute Disease; D000818:Animals; D001794:Blood Pressure; D001929:Brain Edema / Q000000981:diagnostic imaging*; D002415:Cats; D002533:Cerebral Angiography / Q000379:methods; D002560:Cerebrovascular Circulation; D005260:Female; D006973:Hypertension / Q000000981:diagnostic imaging*; D008297:Male; D010841:Pia Mater / Q000098:blood supply*; D014655:Vascular Resistance
Piale Gefässreaktionen bei akuter Hypertonie--eine intravitalmikroskopische Experimentstudie und deren klinische Relevanz für das traumatische Hirnödem.