Dynamic airway closure

It seems as though nerve conduction is not a very popular topic – it is a bit dry.

Perhaps today’s topic, dynamic airway closure, will be of more interest as it is one that candidates really struggle with in vivas.

BT_SQ1.6 Describe the methods of measurement applicable to anaesthesia, including clinical utility, complications and sources of error in particular:
· Methods used to measure respiratory function, including:
– Forced expiratory volume
– Peak expiratory flow rate
– Vital capacity
– Flow-volume loops
– Functional residual capacity and residual volume

West describes the topic well in his book, where the following diagram is taken from. The red circle shows the net pressure gradient between the intrapleural space and the airway.

IMG_0298.PNG

Dynamic airways closure may occur during normal tidal breathing TRUE/FALSE

Dynamic airway closure accounts for the effort dependent portion of the expiratory limb of the flow-volume loop TRUE/FALSE

During forced expiration, positive pressure generated will be transmitted equally across the respiratory system TRUE/FALSE

The trachea is never subject to dynamic airway closure TRUE/FALSE

During the effort independent part of an expiratory flow volume loop, maximum air flow rate is determined by lung volume TRUE/FALSE

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