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. Author manuscript; available in PMC: 2023 Jan 20.
Published in final edited form as: Circulation. 2019 Oct 7;140(15):1239–1250. doi: 10.1161/CIRCULATIONAHA.118.038867

Figure 4.

Figure 4.

Location of United States hospitals categorized by aortic surgery volume and proportion of patients having surgery at high-volume hospitals by state. (A) The geographic location of each hospital in the study that treated a Medicare beneficiary with a type A aortic dissection stratified by proximal aortic and arch surgery volume. The hospital locations are plotted over a population density map of the counties within the continental United States (not shown: Alaska and Hawaii, 0 high-volume hospitals). (B) The proportion of patients that received surgical treatment for an acute type A aortic dissection at a high-volume hospital within each state of the continental United States (not shown: Alaska, 0%; Hawaii, 0%).