Fig. 2
From: Impact of High-Intensity-NIV on the heart in stable COPD: a randomised cross-over pilot study
Individual changes in cardiac output (CO) during spontaneous breathing (SB) after 6Â weeks NIV. Individual changes in cardiac output (CO) after 6Â weeks LI-NIV are shown in red and 6Â weeks HI-NIV are shown in blue. Data are shown from the 11 patients included in the data set analysis and presented in two groups: (i) Patients that started with LI-NIV followed by HI-NIV (the LIHI group, shown left), and (ii) patients that started with HI-NIV followed by LI-NIV (the HILI group, shown right)