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. 2017 May 8;4(1):e000176. doi: 10.1136/bmjresp-2016-000176

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Suction pressure variation in different ETT sizes: model airway pressures are recorded as described in figure 3 using both bronchoscopic and closed catheter suction systems during manual ventilation (left panel) and with the ETT disconnected (right panel). Each manual ventilation procedure was performed with both moderate and maximum suction levels. ETT, endotracheal tube.