Common cause of hypoxia and Cyanosis are :
1. Factors present before the operation
• Oedema of glottis
• Ludwig’s angina
• Bilateral quinsy
2. Carcinoma of larynx
3. Tracheal compression and stenosis due to any cause
4. Foreign body in bronchus
5. Carcinoma of bronchus
6. Acute or chronic bronchial asthma and bronchitis
7. Pulmonary parenchymal diseases
• Diffuse pulmonaryiiihercuIosis
• Emphysema
• Pulmonary fibrosis
8. Space occupying lesions of chest wall is another
9. Air or fluid in pleural cavity
10. Paresis or paralysis of respiratory muscles due to
• Poliomyelitis
• Myasthenia gravis
• Ascending neuromyelitis
11. Lesions involving the circulation
• Cyanotic heart disease
• Pulmonary oedema due to any cause, particularly mitral stenosis is yet another cause of hypoxia .
• Congestive cardiac failure due to any cause
• Shock states
• Polycythemia
• Laryngeal spasm
• Inadequate ventilation due to any cause
• Pulmonary collapse
• Tracheal collapse
12. Lesions of circulation, contribute a lot to the cause of hypoxia .
• Cardiac failure due to any cause
• Pulmonary oedema
• Peripheral circulatory failure
• Excessive transfusion therapy
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