A few weeks ago, in a preliminary report,1 attention was called to some experimental results in the use of potassium and sodium iodids as opaque mediums in roentgenography. Since this report was made, these solutions have been put to practical use in a sufficient number of cases to warrant a report of their clinical application.
PREPARATION OF SOLUTIONS
For pyelography, a 25 per cent, aqueous solution of sodium or potassium iodid is used. Thus, 100 gm. of solution is made by dissolving 25 gm. of the salt in 75 c.c. of water. For cystograms, a 15 per cent. solution gives sufficient density. As was noted in the previous article, these solutions are stable, neutral in reaction, and cause no precipitation in urine or bloody urine. On standing, they become slightly yellow, but this causes no trouble. There are no special precautions to be observed in preparing the solutions, and