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J Appl Physiol 79: 638-647, 1995;
8750-7587/95 $5.00
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Journal of Applied Physiology, Vol 79, Issue 2 638-647, Copyright © 1995 by American Physiological Society

ARTICLES

Muscle blood flow in cats: comparison of microdialysis ethanol technique with direct measurement

R. C. Hickner, U. Ekelund, S. Mellander, U. Ungerstedt and J. Henriksson
Department of Physiology and Pharmacology, Karolinska Institute, Stockholm, Sweden.

A quantitative validation of the microdialysis ethanol technique was performed in cat gastrocnemius muscle. Six to eight microdialysis probes were inserted into the isolated muscle preparation and perfused (0.5-10.0 microliters/min) with Krebs-Henseleit buffer containing between 5 and 1,000 mmol/l ethanol. Skeletal muscle blood flow was held constant in the range of 4-99 ml.100 g-1.min-1 by a servo-controlled roller pump and was determined with the microdialysis ethanol technique as well as by timed collection of venous outflow. The ethanol concentration outflow-to-inflow ratio ([ethanol]collected dialysate/[ethanol]infused perfusion medium) decreased in a nonlinear fashion when microdialysis perfusion flow rates of 0.5 and 1.0 microliter/min were employed. However, a linear decrease was found between 4 and approximately 45 ml.100 g-1.min-1 (r = -0.92 to -0.99). The lower outflow-to-inflow ratio was at 4 ml.100 g-1.min-1 (i.e., due to a low probe perfusion flow rate or a large dialysis membrane), the greater the sensitivity of the method was. It is concluded that this nonradioactive technique provides a simple and valid method for determining nutritive blood flow in skeletal muscle.


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