Fig. 2

Responses of obese patients with a modified Dixon’s up-and-down method. Responses of 30 consecutive obese patients to supraglottic airway device Blockbuster™ insertion and the end-tidal concentrations of sevoflurane in oxygen with a modified Dixon’s up-and-down method. Arrows indicate the mid-point dose of all independent pairs of patients who manifested cross-over from ‘movement’ (○) to ‘no-movement’ (●) response