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Figure 1 Effects of cardiac resynchronization therapy (CRT) on apnea hypopnea index (AHI) in patients with and without central sleep apnea (CSA). The area under the dotted line represents a normal AHI (<5). Squares = mean ± SD of all patients; triangles = mean ± SD of patients with CSA; octagons = mean ± SD of patients without CSA. Stars = p < 0.005 vs. baseline.
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