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Salt, A.N. et al.

Comparison of endolymph cross-sectional area measured histologically with that measured in vivo with an ionic volume marker.

In order to establish how endolymph volume is regulated, it is essential to be able to measure endolymph volume or cross-sectional area in vivo. We have developed methods to accomplish this by injecting the volume marker ion hexafluoroarsenate (AsF6) into endolymph by iontophoresis. For an injection at a constant rate, the endolymph concentration is inversely dependent on the cross-sectional area of the scala into which injection occurred. Marker concentrations were monitored by inserting ion-selective microelectrodes into endolymph near the injection site. In a previous study we quantified the degree of hydrops in animals following ablation of the endolymphatic sac. In the present study we validated the technique by comparing the endolymphatic cross-sectional area measured in vivo with AsF6 with that measured by established histologic procedures. The correlation between the two measures was good, with a coefficient of .903, although the area measured histologically was a little lower than that measured in vivo.[1]

References

Comparison of endolymph cross-sectional area measured histologically with that measured in vivo with an ionic volume marker. Salt, A.N., DeMott, J.E., Kimura, R.S. The Annals of otology, rhinology, and laryngology. (1995) [Pubmed]

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