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I was most interested to read “The effects of haemodialysis on excretion urography in severe chronic renal failure” by Rees and colleagues in your March issue. I believe some observations from our recent experiments may be of interest and possibly help to explain the disappointing effects which haemodialysis may have on improving the study. These observations concern the relationship of opacification to volume change and urinary contrast medium concentration (Ud).
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Peter Duré-Smith (1974) studied this question.
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