About respiratory failure, the following is false:

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.