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What is About respiratory failure, the following is false: and explain in detail?
Type I or Hypoxemic respiratory failure is characterized by PaO2 <60 mm Hg with a normal or low arterial carbon dioxide tension. 

Causes:- Pneumonia, ARDS, pulmonary embolism, pulmonary edema 

Type II or Hypercapnic respiratory failure is characterized by a PaCO2 >50 mm Hg. May be associated with hypoxemia. 

Causes:- Drug overdose, neuromuscular disease, chest wall abnormalities, and severe airway disorders (eg, asthma and COPD) 

Type III failure involves post-operative atelectasis.
Type IV failure is due to decreased blood flow to respiratory muscles.