Home/Equations/Peak velocity variation (ΔVpeak)Peak velocity variation (ΔVpeak)EchoEquationPeak velocity variation (ΔVpeak)ΔVpeak=Vmax−VminVmean×100%\Delta V_{peak} = \dfrac{V_{max} - V_{min}}{V_{mean}} \times 100\%ΔVpeak=VmeanVmax−Vmin×100%ExplainerRespiratory swing in aortic peak velocity over one breath; ≥12% predicts fluid responsiveness in a ventilated patient in sinus rhythm.