Chen Y, et al. - The area and extent of cutaneous sensory blockade and the regression of dermatomal anesthesia after bilateral oblique subcostal transversus abdominis plane (TAP) block was assessed in healthy volunteers included in this observational, prospective clinical study. With bilateral oblique subcostal TAP block, a widespread cutaneous sensory blockade was achieved with a consistent dermatomal distribution in the midabdomen for a considerable effective duration.