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FIGURE 3. Segments with (white portions) and without (black portions) contractile reserve in response to dobutamine infusion in stunned, hibernating, and scarred myocardium. Contractile reserve was more frequently found in stunned than in hibernating myocardium (407 of 666 [61%] vs. 112 of 221 [51%], respectively; P < 0.01). Only 177 (14%) of 1,265 scarred segments exhibited contractile reserve; this percentage was considerably less than in stunned or hibernating myocardium (P < 0.001).
