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If the tip is inadvertently folded on itself at the level of the murphys eye ( the weakest part of the tube) during insertion ( eg pressing on the tracheal wall) it may occlude the ett completely.
It is unlikely to  be folded by soft tissue except in the trachea.

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When looking at the numbers on the tube to determine depth at chords, it is easy to misread the number describing the tube size (eg 4) with the depth marking for 4 cm and inadvertantly insert the ETT too far.
To see the correct marking the tube needs to be rotated 90degrees counter-clockwise after it has passed through the cords.
#example

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The Murphy eye was incorporated into the design of endotracheal tubes to prevent respiratory obstruction in the event the end of the tube abuts the trachea, corina, bronchus, or a mass. refl.in/hy

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