Respiratory Variations in Pulse Pressure Reflect Central Hypovolemia during Noninvasive Positive Pressure Ventilation
Figure 2
Line charts of mean values at each LBNP-level for ΔPP, ΔPOP, PVI, PI, SV, HR, MAP, and PP. Open circle: measurements during spontaneous breathing. Full circle: measurements during NPPV. 1 SD illustrated with one-sided error bars for clarity. ΔPP: respiratory variations in pulse pressure, ΔPOP: respiratory variations in the photoplethysmographic waveform amplitude, PVI: pleth variability index, PI: perfusion index, SV: stroke volume, HR: heart rate, MAP: mean arterial pressure, PP: pulse pressure, NPPV: noninvasive positive pressure ventilation, LBNP: lower body negative pressure.
