| Most frequent causes of ARF type I | |
| Shunting | V/P Mismatch |
| o AMI o Heart failure o Valvular heart disease left. o Sepsis o Broncho aspiration o Multiple trauma o Pancreatitis o Pneumonia o Inhalation injury o Exposure to high altitude | o COPD and asthma o Interstitial lung diseases o Pulmonary thromboembolism o Decrease in the fraction of O2 in inspired air o High altitudes o Inhalation of toxic gases o Decrease of oxygen in the mixed venous blood o Anemia |