Choi MH, Chae JS, Lee HJ, et al. - Researchers undertook this prospective, observational study to determine if the incidence of hypotension following induction of general anaesthesia in patients undergoing laparoscopic cholecystectomy could be predicted by the preoperative diameter and collapsibility index of the subclavian vein (SCV) or the infraclavicular axillary vein. This inquiry was carried out in a tertiary university hospital. The link between the SCV or the axillary vein (SCV-AV) measurements (diameter an collapsibility index) and intra-operative hypotension (IOH) following anaesthesia induction was considered as the main outcome. A higher collapsibility index of the SCV-AV was noted during spontaneous breathing and deep inspiration in patients who encountered IOH. Overall, the collapsibility index of the SCV-AV during deep inspiration was identified as a significant predictor of IOH development as well as the percentage reduction in mean arterial blood pressure following anaesthesia induction. These findings required to be corroborated in further studies among patients with higher collapsibility index, before the collapsibility index of the SCV-AV can be advised unequivocally for clinical use.