I assume it is related the raised intrathoracic pressure caused by coughing.
2.
During expiration, the positive intrathoracic pressure causes decreased blood return to the right side of the heart.
3.
During respiratory inspiration, the negative intrathoracic pressure causes increased blood return into the right side of the heart.
4.
The negative intrathoracic pressure may cause the left atrium to expand and stretch its walls during each OSA event.
5.
They also significantly increase negative intrathoracic pressures that can harm internal structures and potentially impair post-operative recovery.
6.
"' Tracheal deviation "'is a clinical sign that results from unequal intrathoracic pressure within the chest cavity.
7.
So if the vein gets cut, it cannot close and air is sucked in due to negative intrathoracic pressure causes air embolism.
8.
"' During expiration "', the chest wall collapses and decreases the negative intrathoracic pressure ( compared to inspiration ).
9.
Splitting of S2, also known as physiological split, normally occurs during inhalation because the decrease in intrathoracic pressure increases the time needed for pulmonary pressure to exceed that of the right ventricular pressure.
10.
Spontaneous perforation of the esophagus most commonly results from a full-thickness tear in the esophageal wall due to a sudden increase in intraesophageal pressure combined with relatively negative intrathoracic pressure caused by straining or vomiting ( effort rupture of the esophagus or Boerhaave's syndrome ).
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