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Department of Neurology (Drs. Griggs, Moxley, and Ms. Herr), and Department of Pediatrics (Dr. Forbes), University of Rochester School of Medicine and Dentistry, Rochester, NY.
We performed sequential studies of two methods used to estimate muscle mass in 34 patients with progressive neuromuscular disease for periods of up to 52 months. Creatinine excretion and total body potassium were low at the outset in virtually all patients. Creatinine excretion continued to decline in most patients, but total body potassium did not decline significantly. Creatinine excretion may measure declining muscle mass more accurately than total body potassium, but both measurements can estimate muscle mass for metabolic studies or therapeutic trials.
Address correspondence and reprint requests to Dr. Griggs, Department of Neurology, Box 673, University of Rochester, 601 Elmwood Avenue; Rochester, NY 14642.
Supported in part by grants from the Muscular Dystrophy Association, US Public Health Service Grant No. RR 00044 from the Division of Research Resources of the National Institutes of Health, and by a grant from the NIH, National Institute of Arthritis, Metabolism, and Digestive Diseases No. AM 22048; and NICHHD 18-454. A portion of this work was performed under contract number DE-AC02-76EV03490 with the US Department of Energy at the University of Rochester, Department of Radiation, Biology and Biophysics.
Accepted for publication June 18, 1982.
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