D. A. K. BLACK, M.D.
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To the editor: I am full of praise for the [American Heart Association's] scheme (Ann Intern Med 75:251-252, 1971) for evaluating the severity of renal disease, which is a service to precise communication as well as to patient care. What is worthy of praise is also worthy of criticism, and I find the definition of the primary criterion for Class B (Functional Impairment) ambiguous. Should it not read, "Glomerular filtration rate reduced, but still more than 50% of normal" (added words in italic)?
BLACK DAK. Worthy Criteria, Worthy Criticism: A Correction. Ann Intern Med. ;76:145. doi: 10.7326/0003-4819-76-1-145_1
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Published: Ann Intern Med. 1972;76(1):145.
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