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Standing potential and c-wave during changes in PO2and flow in the perfused cat eye

✍ Scribed by Beat Kreienbühl; Günter Niemeyer

Publisher
Springer-Verlag
Year
1985
Tongue
English
Weight
337 KB
Volume
60
Category
Article
ISSN
0012-4486

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✦ Synopsis

Changing flow rate (F) in arterially perfused cat eyes concomitantly alters the supply of 02 and greatly affects electrical signals: increasing F increases the standing potential (SP) and decreasing F induces the opposite. Corresponding effects on c-wave are more variable.

To separate changes in supply of 02 from changes in F we performed two types of experiments: (I) changing supply of 02 while keeping F constant; this was done by switching to a perfusate of different PO2: and (2) changing F while keeping the supply of 02 constant; this was done by switching to hypoxic or hyperoxic perfusates and adjusting F to keep the b-wave amplitude constant.

Results (1): Decrease in PO 2 left the SP essentially unaffected, but increased the cwave. Increase in PO~ tended to increase the SP and to decrease the c-wave. Results (2): Isolated decrease in F did not affect the SP consistently and left the c-wave unchanged. Isolated increase in F often increased the SP, but also left the c-wave unchanged.

Covadation between SP and amplitude to the c-wave was absent during hyperoxia.

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