Question

I know it stops respiration but how?

Answer 1

Chronic lung diseases cuase chronic general asphyxia (Increased PCO2 and Decreased PO2) due to decreased alveolar ventilation. And it is characterized by:

• respiration is stimulated by both decreased PO2 and increased PCO2
• persistent hypercapnia leads to decreased response of breathing center to CO2 due to increased HCO3- transfer from blood to CSF
• hypoxia is the means for respiratory drive

Hence, if the hypoxic drive is lost due to excessive O2 therapy, respiration stops.

Comments

good explanation

Answer 2

From Our Facebook page "Medical Online Magazine" :

Asmira Basic: Because it may worsen hypercapnia in some situations.

Samir Ratna Bajracharya: excess of O2 might cause depression of the respiratory center in the brain causing respiratory failure.

Shanti Gurung: because low arterial oxygen level is the client's primary drive for breathing.