Effects Intrapleural Pressure Flashcards Preview

PHYSIOLOGY > Effects Intrapleural Pressure > Flashcards

Flashcards in Effects Intrapleural Pressure Deck (6)
Loading flashcards...

volume is inverse to

- pressure


during inspiration

- thoracic pressure decreases
= have a massive venous return to lung
- temporary pooling of blood during inspiration
- flow to the LA is decrease
- flow to the LV is also decrease
- decrease CO
- decrease BP by 10mm Hg
- increase HR phenomenon called paradoxical fall of blood pressure during inspiration


during expiration

inverse to inspiration


valsalva manuever

- squeezing lung
in the BEGINNING: decrease BP and increase HR
LATER: increase BP and decrease HR
END: decrease venous return to the lung due to decrease pressure gradient
decrease flow to the heart
decrease BP
increase HR causing fainting


positive end-expiratory pressure (PEEP)

- volume cycled most common
- is applied at the end of the expiratory cycle to decrease alveolar collapse
- goal is help the patient to empty his alveolus


simple pneumothorax (losing the negative intrapleural pressure, losing lungs ability to expand causing the lung to collapse)

- due rupture blebs opening air outside
- increase intrapleural pressure (negative pressure) as it becomes more negative the becomes more expanded, it lose its expanding ability because intrapleural pressure became more negative as atmospheric pressure
- decrease lung recoil to zero as lung collapse
- chest wall expands