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Aortic peak systolic velocity variation (ΔV_peakAo) is a reliable dynamic indicator of preload in mechanically ventilated children. However, easily measurable alternative parameters like carotid peak systolic velocity variation (ΔV_peakCa) and suprasternal peak systolic velocity variation (ΔV_peakSs) are not well evaluated in children. The aim of the study was to find correlation between ΔV_peakCa and ΔV_peakSs to ΔV_peakAo, as potential surrogate markers of fluid responsiveness. 52 children, 1–12 years old, undergoing major non-cardiac surgeries under general endotracheal anaesthesia were recruited for this single-centre prospective observational study. ΔV_peakAo, ΔV_peakCa and ΔV_peakSs were measured by pulsed wave Doppler in appropriate windows, measuring maximum and minimum peak flow velocity over a single respiratory cycle. Calculated parameters were compared by a repeated measures study …