Fig. 2From: Remifentanil requirement for i-gel insertion is reduced in male patients with Parkinson’s disease undergoing deep brain stimulator implantation: an up-and-down sequential allocation trialPatient responses to i-gel insertion. A successful insertion dose is denoted by a solid circle; a failed insertion dose is denoted by an open circle; horizontal bars represent crossover midpoints (failure-to-success). PD, Parkinson’s disease; NPD, non-Parkinson’s diseaseBack to article page