Ophthalmoscopy is of great value in studying retinal circulation. However, its value is limited if the size and function of the vessels are examined. I n this connection retinal circulation time (RCT) determinations should be of some aid. This type of study is well known in many other connections, e. g. in determination of the cardiorespiratory tract circulation. AdEer (1) has suggested this method to the retina, and Chao and Flocks (3) and Flocks, Miller and Chao ( 4 ) have made several measurements of RCT on laboratory animals.The purpose of this paper is to describe a method and to present the preliminary data of RCT determinations on human subjects.
MATERIAL22 RCT determinations were done on a series of 15 in-patients. The diagnosis and the present ophthalmoscopic findings are presented in the table.
M E T H O DAn attempt to determine RCT by dye injection into the cubital vein was unsuccessful, since the dye was diluted so much that no traces of it could be observed in the retinal vessels.An arterial puncture was then made in every case. I n 13 patients the RCT determination was done in connection with cerebral angiography. The internal carotid artery was punctured in 8 cases, and the common carotid artery in 7. The routine preoperative medication contained usually 0.5 cc. of 2 per cent ") Received Nov. 18th 1959.
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