What are the causes of a pressure ulcer? (Select all that apply.)

Choice A reason: A susceptible host is not an infectious disease, but a factor that influences the transmission of an infectious disease. A susceptible host is a person who is vulnerable to infection due to factors such as age, health status, immunization, or genetic predisposition. A susceptible host may become infected by a communicable disease, but it is not the disease itself.

Choice B reason: A communicable disease is an infectious disease that can be transmitted directly from one person to another. A communicable disease is caused by a pathogen, such as a virus, bacterium, fungus, or parasite, that can spread through contact, droplet, airborne, vector, or vehicle transmission. Examples of communicable diseases are influenza, tuberculosis, measles, malaria, and HIV/AIDS.

Choice C reason: A portal of entry to a host is not an infectious disease, but a factor that influences the transmission of an infectious disease. A portal of entry to a host is a route through which a pathogen can enter the body of a susceptible host and cause infection. A portal of entry to a host may be a break in the skin, a mucous membrane, or a body opening, such as the mouth, nose, eyes, or genitals. A portal of entry to a host may facilitate the transmission of a communicable disease, but it is not the disease itself.

Choice D reason: A portal of exit from the reservoir is not an infectious disease, but a factor that influences the transmission of an infectious disease. A portal of exit from the reservoir is a route through which a pathogen can leave the body of an infected person or animal and reach another susceptible host. A portal of exit from the reservoir may be a body fluid, such as blood, saliva, urine, or feces, or a body part, such as the skin, hair, or nails. A portal of exit from the reservoir may enable the transmission of a communicable disease, but it is not the disease itself.

Choice A reason: Fistula is a complication of wound healing that is an abnormal passage that connects two body cavities or a cavity and the skin. Fistula can occur as a result of infection, inflammation, trauma, surgery, or congenital defect. Fistula can cause pain, bleeding, discharge, or leakage of fluids or gases from the affected organs or tissues. Fistula can also increase the risk of infection, obstruction, or perforation of the involved organs or tissues.

Choice B reason: Hemorrhage is not a complication of wound healing that is an abnormal passage that connects two body cavities or a cavity and the skin, but rather a complication of wound healing that is an excessive or uncontrolled bleeding from the wound site. Hemorrhage can occur as a result of trauma, surgery, infection, or coagulation disorder. Hemorrhage can cause pain, swelling, bruising, or shock at the wound site. Hemorrhage can also lead to blood loss, anemia, or hypovolemia.

Choice C reason: Infection is not a complication of wound healing that is an abnormal passage that connects two body cavities or a cavity and the skin, but rather a complication of wound healing that is an invasion and multiplication of microorganisms in the wound site. Infection can occur as a result of contamination, poor hygiene, or impaired immunity. Infection can cause pain, redness, warmth, swelling, or pus at the wound site. Infection can also trigger inflammation, fever, or systemic illness.

Choice D reason: Evisceration is not a complication of wound healing that is an abnormal passage that connects two body cavities or a cavity and the skin, but rather a complication of wound healing that is a protrusion of internal organs or tissues through the wound site. Evisceration can occur as a result of dehiscence, which is a separation or splitting open of the wound edges. Evisceration can cause pain, bleeding, or shock at the wound site. Evisceration can also expose the internal organs or tissues to injury, infection, or necrosis.