The rate of formation of tissue fluid for a given increase of venous pressure and for a known volume of tissue has been measured in the forearm. There is a significant increase in this figure in rheumatoid arthritis and a still greater increase in patients who develop recurrent oedema. This increase could not be attributed to steroid or phenylbutazone therapy, nor to a fall in the serum albumin. The results imply that there is some generalized abnormality in capillary function in rheumatoid disease and that this change is not limited to the joints.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1795866PMC
http://dx.doi.org/10.1136/bmj.2.5761.555DOI Listing

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