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Cochlear blood flows of normal adult guinea pigs were observed with the aid of a laser doppler flowmeter. It became established that the laser doppler system provides a useful tool for the observation of blood flow in the study on cutaneous circulation. Through the present experiment on cochlear blood flow, our experience confirmed the validity of this flowmetry system in its specificity and sensitivity to the blood flow. In the present study with asphyxia loading and Angiotensin II infusion, responses of cochlear blood flow showed the close correlation with those of systolic blood pressure. Increase of cochlear blood flow during Angiotensin II infusion was found to be dose-dependent in some range of blood pressure increase. This increase of cochlear blood flow could be attributed to the secondary effect of the blood pressure increase due to Angiotensin II. It seemed that there was no correlation between the responses of auricular skin blood flow and these of systolic blood pressure. Furthermore, auricular skin blood flow was noted to decrease by increasing the dosis of Angiotensin II. In this respect, it would be reasonable to assume that cochlear blood circulation posseses the different characteristics of hemodynamics from the auriclar blood circulation which is regarded as being in common with the cutaneous blood circulation. The close correlations that the present experiment showed in asphyxia loading and Angiotensin II infusion may indicate the presence of passive aspect in the physiology of cochlear blood circulation. To understand the hemodynamics of the inner ear blood flow further, researches for the specific aspect for the inner ear blood circulation should be continued hereafter by creating various experimental conditions.

Studies on cochlear blood flow using laser doppler flowmeter.