Circulation, Vol 64, 1227-1234, Copyright © 1981 by American Heart Association
L Goldman, B Hashimoto, EF Cook and A Loscalzo
Reproducibility and validity are prerequisites for a useful clinical scale.
We therefore prospectively tested the reproducibility and validity of the
New York Heart Association criteria and the Canadian Cardiovascular Society
criteria for the assessment of cardiac functional class and compared these
criteria with a new Specific Activity Scale based on the metabolic costs of
specific activities. The New York Heart Association estimates made by two
physicians had a reproducibility of only 56%, and only 51% of the estimates
agreed with treadmill exercise performance. Functional estimates based on
the Canadian Cardiovascular Society criteria were significantly more
reproducible (73%), but not significantly more valid. The Specific Activity
Scale was as reproducible as the Canadian Cardiovascular Society criteria,
and its 68% validity was significantly higher than the validities of the
other systems. The easily administered Specific Activity Scale was equally
reproducible and valid when used by a nonphysician. It was especially
better than the other systems for the evaluation of true class II patients
and was significantly less likely to underestimate treadmill performance.
Although no set of questions can perfectly predict exercise tolerance, the
Specific Activity Scale deserves wider prospective testing.
ARTICLES
Comparative reproducibility and validity of systems for assessing cardiovascular functional class: advantages of a new specific activity scale
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