| http://www.w3.org/ns/prov#value | - Head extension can cause movement of the tube in a cephalad direction, which may result in bronchial decannulation; head flexion can cause movement of the tube in a caudad direction, which may result in an upper lobe obstruction or in both luminas being in a mainstem bronchus (see next section). 262, 263 Finally, the fiberoptic bronchoscope is used whenever during the case there is a question abou
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