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Constant indicator dilution measures local venous flow with ~5% in vivo accuracy.
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A method for measuring local venous flow by a constant indicator dilution technique is described. The optimal conditions have been outlined and the accuracy tested in vitro and found to be within ±3%. When compared with direct measurements of venous flow in dogs, its accuracy was within ±5%. The method is safe, easy to perform and, with the catheters described, flow can be measured over ranges of 20 to 5,700 ml/min in any vein greater than 4 mm inner diameter in which the catheter tips can be introduced.
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Kountz et al. (1964) studied Local venous flow measurement. Constant indicator dilution method vs. Direct measurement of venous flow was evaluated on Accuracy of local venous flow measurement. The constant indicator dilution method measured local venous flow (20-5,700 ml/min) with ±3% in vitro accuracy and ±5% accuracy vs direct measurement in dogs.
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