In case of a pericardial tear, this air enters the pericardial cavity and pneumopericardium develops.
2.
The condition may remain asymptomatic or may progress to life-threatening conditions like tension pneumopericardium or cardiac tamponade.
3.
Pneumomediastinum is the presence of air in the mediastinum, which in some cases can lead to pneumothorax, pneumoperitoneum, and pneumopericardium if left untreated.
4.
The mechanism responsible for pneumopericardium is the "' Macklin effect "' There is initially an increased pressure gradient between the alveoli and the interstitial space.
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