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. Author manuscript; available in PMC: 2010 Jan 5.
Published in final edited form as: Circ Cardiovasc Qual Outcomes. 2009 Jan 13;2(1):9–15. doi: 10.1161/CIRCOUTCOMES.108.813741

Figure 1. Geographic distribution of hospitals, firehouses and patients with cardiac symptoms who called 911 in 2004.

Figure 1

Hospitals are represented by a blue “H”. Firehouses with emergency medical service (EMS) facilities are represented by a red cross. Patient calls (N=5,887) are represented by shaded circles and are scaled in size to represent the number of calls, ranging from 1 to 97 calls from any single Census block group.