Laboratory testing evidenced elevated NT-proBNP levels among COPD patients as compared to controls (453.2±909.0 pg/mL vs 96.8±70.0 pg/mL); however, NT-proBNP distribution failed to reach statistical significance ( P =0.08).
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Speckle tracking echocardiography in chronic obstructive pulmonary disease and overlapping obstructive sleep apnea.
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