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Twenty-four survivors of acute, nonobstructive, nonnephritic renal failure had a renal scan using iodohippurate sodium I 131 performed early in the acute illness. Scans were judged according to whether the renal images were prominent, faint, or absent during the first 30 minutes after intravenous injection of 100 to 250 microcuries of iodohippurate sodium I 131. All ten patients with prominent renal images attained life-sustaining renal function with an average postrecovery creatinine clearance of 80 ml/min. Of the seven patients with faint renal images, six recovered life-sustaining renal function (average creatinine clearance of 39 ml/min), and one required chronic hemodialysis. Seven patients had no renal image initially; four recovered life-sustaining renal function with an average creatinine clearance of 25 ml/min; three required chronic hemodialysis. We conclude that, for patients with acute renal failure, the appearance of the renal image obtained using this substance is an important indicator of renal viability and of the likelihood for functional recovery.

A spectral analysis technique for quantifying dyskinesia in patients with diagnosis of Hungtington's Disease (chorea) (H.D.) is described. Spectral analysis involves computation of the magnitude of abnormal involuntary movements (AIMS) and of their distribution in frequency. It has the advantage of providing an objective measure of such movements. Three H.D. patients under different drug regimens and three age-matched controls have been evaluated and representative time records and power spectra are presented. Analysis established marked differences in the amplitude and shape of the normal and patient spectra. In addition, spectral analysis proved sensitive to differences in drug treatments among patients suggesting its additional use in evaluating the efficacy of therapeutic agents in the treatment of movement disorders.

Renal biopsy specimens from two patients with gold nephropathy showed two distinctly different types of alterations. The first demonstrated lesions suggestive of immunologic injury primarily to the glomerulus and identical with membranous glomerulonephritis. The second had no evidence of immunologic injury, but contained extensive vacuolar degeneration of proximal tubular epithelial cells. Ultrastructurally, the vacuoles contained lipid materials and occupied the basal portion of the cells. Other tubular cells contained numerous "gold-containing" cytosegresomes. In this second specimen, it appeared that the filtered gold had a direct toxic effect on the tubular epithelium and perhaps also on the glomerular capillary wall. These findings suggest that gold nephropathy may indeed be a spectrum of a combination of both direct toxic and immunologic injury to glomeruli and tubules.

The report presents a method developed to analyze strip chart records generated by a system previously described and termed cineseismography which makes available quantitative records of abnormal involuntary movements in the human. In this report, method for converting measurements made on the strip chart record is described. Application of the method is made in three cases with diagnosis of Huntington's disease (chorea). Case histories are presented for each subject detailing the medications and dosage, and the quantitative data together with the histograms derived are provided. Preliminary trials indicate that movement decomposition, as in ataxia, can also be detected and quantified.