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. 2017 Jul 28;12:2221–2230. doi: 10.2147/COPD.S134498

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© 2017 Kabbach et al. This work is published and licensed by Dove Medical Press Limited

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Poincare plots for (A) a patient from the exacerbated group and (B) a patient from the stable group.

Abbreviations: RRi, R-wave peak detection intervals; SD1, standard deviation measuring the dispersion of points in the plot perpendicular to the line of identity; SD2, standard deviation measuring the dispersion of points along the line of identity; GAE, acute exacerbation COPD group; GSta, stable COPD group.