Type I Respiratory failure
Arterial Hypoxia
Due to oxygenation failure
PO2- Low ,PCO2- Normal or Low
PAO2-PaO2 gradient- Increased
eg:ARDS,Pulmonary HTN,ILD,Pneumonia,Pulmonary Edema.
Type II respiratory failure
Arterial Hypercapnia
Due to Ventilatory failure
PO2-Low, PCO2-High
PAO2-PaO2 gradient-Unchanged
Eg:Myasthenia,GBS,MS,ALS,IC bleed,Polio,Narcotic overdose
Type III Respiratory Failure
Combined Oxygenation,ventilation failure
PO2-LOw,PCO2-HIGH
PA02-PaO2 gradient-Increased
eg:ARDS,COPD,Asthma
Type IV respiratory failure
Due to hypoperfusion of respiratory muscles
eg:Cardiogenic shock
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