\(y=\frac{1}{x}\) This means that the line y=0 is a horizontal asymptote. Horizontal asymptotes occur most often when the function is a fraction where the top remains positive, but the bottom goes to infinity. Going back to the previous example, \(y=\frac{1}{x}\) is a fraction.
Causes of Wounds. Wound causes can be internal or external in origin. Wounds of internal origin are mainly due to impaired circulation, neuropathy or medical illness. Wounds of external origin are due to an outside force or trauma that causes open or closed wounds.
Causes. The most common cause of pressure wounds and skin integrity issues is constant pressure from squeezing skin against a surface (such as a bed or wheelchair) which can reduce blood flow to the area and cause injury. This typically happens if someone remains in one position for a prolonged period of time.