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Nasal canula 24-40% (up to 6 lpm), Simple face mask up to 50% (at least 5 lpm), Non rebreather up to 100% (10-15 lpm) ... Bronchial - High pitch, loud “harsh” sound, heard anteriorly over trachea. ... Post-op confusion and delirium occurs about 50% of the time in the older age group. ................
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