Fig. 1From: Association of infraclavicular axillary vein diameter and collapsibility index with general anesthesia-induced hypotension in elderly patients undergoing gastrointestinal surgery: an observational studyAXV and IVC were measured in M-mode. Measurement of AXV diameter during inspiration (dAXVmin) and expiration (dAXVmax) (a). Measurement of IVC diameter during inspiration (dIVCmin) and expiration (dIVCmax) (b). (dAXVmax, maximum diameter of the axillary vein; dAXVmin, minimum diameter of the axillary vein; dIVCmax, maximum diameter of the inferior vena cava; dIVCmin, minimum diameter of the inferior vena cava)Back to article page