Fig. 2
From: Predicting the Need for Fluid Therapy—Does Fluid Responsiveness Work?
Starling curve and respiratory variation of SV. At the point where the ascending limb of Starling curve, respiratory variation in the stroke volume is significant (a) and judged as a large preload reserve. While at the point where the Starling curve is nearly flat, the respiratory variation is minimal (b) with a small preload reserve. SV stroke volume