Flashcards in First Aid-Physiology Deck (7)
What happens when Alveolar partial pressure of oxygen falls?
Hypoxic vasoconstriction which diverts blood to other well ventilated areas for better gas exchange
How can COPD lead to cor pulmonale?
COPD causes hypoxic vasoconstriction which leads to pulmonary hypertension and eventual cor pulmonale as the the right ventricle dilates because it is pumping against greater pressures
Alveolar gas equation
PAlveolar= PIO2 (150mmHg) - Parterial CO2/ R
The amount of oxygen that can be transferred from alveolar spaces to arterial spaces....the lower the difference the better the transfer (better diffusion)
normal is 10-15 mmHg
Widened A-a gradient causes of hypoxemia?
means that oxygen is getting into the lungs but is not being transferred to the blood
1. V/Q mismatch
2. Right to Left Shunting
3. diffusion limitation (fibrosis)
What is Hypoxemia? Hypoxia?
1. Hypoxemia--is decreased partial pressure of oxygen in the blood
2. Hypoxia-- is decreased delivery of oxygen to the tissues