Exposed Blood Vessels Research Articles

Blood flowmeters.

MOST of the present knowledge of blood flow in man has come from such indirect methods as the Fick and dye-dilution technics for measurement of cardiac output. Regional flow to the liver, kidneys and brain has been determined by similarly indirect means with the use of selectively excreted indicators or inert gases. Recently, the application of more direct methods of flow measurement, such as the flowmeter used on surgically exposed blood vessels, has attracted much interest and supplied some new information. This review will deal with these "direct" methods, most of which are flow-velocity-sensing devices.No method of flow measurement . . .

Genesis of Endolymphatic Hypoxia Following Acoustic Trauma

(1) Loud bursts of pure tone tend to decrease slightly the hydrogen diffusion rate into the first turn of the scala media of the eupneic guinea pig and markedly in the hyperventilated animal (2) White noise increases the rate of diffusion of hydrogen gas into the auditory cortex of the nonanesthetized cat. (3) Acoustic trauma produces vascular stasis in exposed blood vessels of the hamster cheek pouch. These results are interpreted as indicating that the endolymphatic hypoxia following loud sound is due to a decrease in the oxygen supply/demand ratio resulting from (a) an increase in metabolism, and (b) no change, or decrease in cochlear blood flow and/or permeability of the stria vascularis.