*7.3.10.3 Size selection, practical aspect, adjuncts*

Size selection is done on a weight basis (**Table 10**). It is available in three sizes. Device placement is easy and offers less resistance. The major advantage of the device design is

**Figure 21.** *Air-Q blocker.* *Second Generation Supraglottic Airway (SGA) Devices DOI: http://dx.doi.org/10.5772/intechopen.93947*

that conventional PVC endotracheal tube can be passed through it without the use of conventional laryngoscope. It is useful in delivery of anaesthesia, resuscitation, critical care and difficult airway management in and out of hospital. It has a self-pressurising cuff which inflates to adequate pressure during positive pressure ventilation. This prevents airway trauma and morbidity associated with excessive cuff inflation [100].
