VQ And Positioning Flashcards
What happens in side laying in v/q matching
The bad lung should be placed up, positioning should be done to facilitate the good lung, the upper lobes are better ventilated compared to the lower however they have more potential to inflate at the bottom. Perfusion is better in the good lung now as air takes the path of least resistance. The lower lobes have a mechanical pressure over the upper lobes due to abdominal pressure causing twice the excursion
Slumped on a plinth, how is ventilation perfusion affected?
Most blood at posterior bottom lung, the lungs can’t fully inflate due to the position of the abdomen and the diaphragm can’t contract due to this. There is no perfect match. Aleveoli can’t open properly. Perfusion is ok however there is a lack of air. This causes a ventilation/ perfusion mismacth
Why is side laying a good position for ventilation/ perfusion matching?
The patient is placed in side laying, the bad lung is placed up and the good lung down, the secretions can become drained. Airflow takes the path of least resistance. The blood flows to the good lung which means the lung can become perfused causing a v/q match as the blood and air are in the same place. This gives the independent regions a mechanical advantage as they have abdominal pressure, causing twice the excursion
What is collateral ventilation
It is a back up system of alveolar ventilation that can bypass the normal route of airflow when the airways are restricted or obstructed. The pathways involved include those between adjacent alveoli, between bronchioles and alveoli and this between bronchioles
What is the reasoning for doing acbt in breathing Control and TEES
Collateral ventilation
Why do breathing control?
Decrease airway turbulence and favours the dependent regions
Decreases dead space and relaxes the shoulder girdle
What does pursed lip breathing do
Elongated expiration which opens up the alveoli for longer which helps with gas exchange.
Why do deep breathing exercises
It helps with collateral Ventilation
It holds the alveoli open for longer which helps with diffusion and gas exchange.
What is fixing used for?
It decreases the use of the accessory muscles
What does normal mucocilliary clearance look like?
A normal clearance requires an open airway, a functional mucocilliary escalator and an effective cough. Airways normally are kept open by structural support mechanisms and kept clear by the normal functioning of the cilia. The ciliates epithelium is responsible for the continuous flow of mucus over the airway surface to the upper respiratory tract. Mucus is moved via a coordinated movement of ciliary motion toward the trachea and larynx, where excess secretions can be swallowed or expectorated.
