Tracheostomy reduces dead space by
Impoant effects of tracheostomy on respiratory physiologyTracheostomy decreases dead space as upper airways and nasal cavity are bypassedTracheostomy decreases ventilation/perfusion (V/Q) ratio. Increased dead space increases ventilation/perfusion ratio as the dead space (containing air) is ventilated but not perfused for gaseous exchange. Tracheostomy decreased the dead space, therefore it will decrease the V/Q ratioTracheostomy reduces the airflow resistance(Refer: Morgan and Mikhail's Clinical Anaesthesiology, 5th edition, pg no. 1237)
By-passing upper airway
Increased V/Q ratio
Reducing airflow resistance
By all of the above mechanisms
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