Figure 2From: Impediment in upper airway stabilizing forces assessed by phrenic nerve stimulation in sleep apnea patientsPlot of the flow/pharyngeal pressure relationships obtained with data presented in Figure 1. The flow-limited nature of the twitch-induced flow is clearly demonstrated by the flow drop associated with the pharyngeal pressure decrease once Pphar lim and the corresponding I max have been reached. A clear difference in the flow/pressure curves can be seen between the expiratory and inspiratory twitches.Back to article page