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Figure 3 Percentage of post-myocardial infarction (MI) patients receiving beta-blockers at discharge in various geographic regions (each represented by a solid circle) across the U.S. Note the marked variability in the percentage of "ideal" patients receiving beta-blockers. If practice guidelines were more effectively and uniformly applied to practice, this variability would be far less, and more than 80% of all post-MI patients would be receiving beta-blockers.

Copyright the Trustees of Dartmouth College 1999. Reprinted with permission, from Wennberg DE, Birkmeyer JD. The Dartmouth Atlas of Cardiovascular Health Care. Chicago, IL: The American Hospital Association Press, 1999 (10).