Fig. 1From: Unexpected abnormal positive pressure due to misconnection of excess gas tubeExcess gas tube misconnection to the safety valve of Jackson Ree’s system connecter. A–C Misconnection of the excess gas tube to the safety valve of Jackson Ree’s system connecter. B The excess gas tube (blue arrow) is misconnected to the safety valve at Jackson Ree’s circuit connecter (red arrow) on the left side of the anesthesia machine (Apollo, Draeger, Germany). Note the standard diameter of the excess gas piping with no misconnection prevention mechanisms. D Correct connection of the excess gas system. The excess gas tube (blue arrow) is connected to the excess gas chamberBack to article page