Andy Resnick said:Pressure always acts normal to the vessel walls, the fluid velocity (shear stress) is tangent to the walls.
Airway collapse occurs when the pressure outside of the airway is greater than the pressure inside. This can happen due to a variety of reasons, such as a blockage in the airway, a decrease in the strength of the airway walls, or a decrease in the size of the airway itself.
The pressure outside can exceed the pressure inside the airway due to a variety of factors. One common cause is an obstruction in the airway, such as a tumor or a foreign object. Other causes may include diseases or conditions that weaken the airway walls, such as chronic obstructive pulmonary disease (COPD) or emphysema.
Airway collapse can significantly affect breathing, as it can restrict the flow of air into and out of the lungs. This can lead to difficulty breathing, shortness of breath, and decreased oxygen levels in the body. In severe cases, airway collapse can lead to respiratory failure and require emergency medical treatment.
In some cases, airway collapse can be prevented by addressing underlying causes such as treating diseases or conditions that weaken the airway walls. However, in some cases, such as when a foreign object is blocking the airway, prevention may not be possible. It is important to seek medical attention if you experience symptoms of airway collapse.
The treatment for airway collapse depends on the underlying cause and the severity of the collapse. In some cases, a simple maneuver such as removing a foreign object or changing body position may relieve the collapse. In more severe cases, medical interventions such as intubation, bronchoscopy, or surgery may be necessary to open the airway and improve breathing.