A pattern to evaluate airway resistive phenomenon using Rohrer's equation.

The phenomenon of airway resistance to inflow is complex and has different behaviors as the fluid flows. The physiopathology of main respiratory diseases shows alterations in the resistive component. The complete description of the phenomenon requires more robust mathematical tools of the mechanics of fluid physical science. The pattern presented below simplifies these observations, evidences in didactic form the main elements related to the resistive phenomenon, and uses basic mathematics to describe the observations done. A fluid moves through a conduit due to the pressure difference ( P) that overcomes the attrition after the flow (V) (3). Thus, V depends on the existence of P between the extremities of the conduit, as follows: