Fig. 3
From: Impact of High-Intensity-NIV on the heart in stable COPD: a randomised cross-over pilot study
Cardiac output at baseline, after 6Â weeks NIV during spontaneous breathing and under NIV. Cardiac output during spontaneous breathing is shown in the filled areas and under NIV in the dashed areas. Data are presented in two groups: (i) patients that started with LI-NIV followed by HI-NIV are shown in green, and (ii) patients that started with HI-NIV followed by LI-NIV are shown in purple