Hekmat Ahmed

Chronic bronchitis is defined as a chronic productive cough lasting at least three months in two consecutive years.

Atelectasis happens when lung sacs (alveoli) can’t inflate properly, so blood, tissues, and organs may not get oxygen. It can be caused by pressure outside your lung, a blockage, low airflow, or scarring. The most common cause of atelectasis is surgery with anesthesia. Atelectasis usually resolves after treating the underlying cause.