Article Figures & Data
Figures
- Fig. 1.
Pulse amplitude ratio using plethysmographic waveform recording under the Valsalva maneuver in a subject with COPD exacerbation associated with ventricular dysfunction. Plethysmographic pulse amplitude ratio = minimum plethysmographic pulse amplitude (PPAmin)/maximum plethysmographic pulse amplitude (PPAmax). In the example of this figure, the plethysmographic pulse amplitude ratio = 0.60.
- Fig. 2.
Box plots showing plethysmographic pulse amplitude ratio (plethPAR) in the 3 study groups: acute heart failure group, subjects with COPD exacerbation and left ventricular dysfunction (COPD exacerbation with LVD), and subjects with COPD exacerbation without left ventricular dysfunction (COPD exacerbation without LVD). The line in each box indicates the median. The upper and lower limits of each box indicate the 75th and 25th percentiles, respectively. Whiskers denote the 90th and 10th percentiles. *, P < .05 vs acute heart failure and COPD exacerbation with left-ventricular dysfunction groups.
- Fig. 3.
Correlation between plethysmographic pulse amplitude ratio (plethPAR) and brain natriuretic peptide in subjects with COPD exacerbation. The regression line and correlation coefficient are shown.
- Fig. 4.
Receiver operating characteristic curves for the diagnosis of left ventricular dysfunction related to plethysmographic pulse amplitude ratio (plethPAR) and to Boston score. Area under the curve was 0.92 (95% CI 0.87–0.97) and 0.76 (95 CI 0.66–0.85), respectively, for the plethysmographic pulse amplitude ratio and Boston score.
