∆Vpeak | 100 (Vpeakmax − Vpeakmin)/(Vpeakmax + Vpeakmin)/2 [≥12%] [36] |
IVC distensibility index | 100 (IVCend-insp − IVCend-exp)/IVCend-insp [≥18%] [37] |
SVC collapsibility index | 100 [(SVCend-exp − SVCend-insp)/SVCend-exp] [≥36%] [38] |
Response to PLR test | (SViPLR − SVibasal)/SVibasal [≥12.5%] [38] |