Changes in Respiratory Variation of Velocity-Time Integral and Peak Velocity of Left Ventricular Outflow Tract after Tidal Volume Challenge Predict Fluid Responsiveness in Elderly Patients with Low Tidal Volume Ventilation: A Prospective Observational StudyJingjie Wan, Fu‐Hai Ji, Jin Xie et al.|Journal of Cardiothoracic and Vascular Anesthesia|2025Cited by 1