CRNFA Practice Exam Prep: Study Guide and Practice Test

A dirty or infected wound is primarily characterized by the presence of retained devitalized tissue. This type of tissue can serve as a medium for bacterial growth and hinder the normal healing process. The presence of devitalized tissue indicates that the wound is not clean and may also contribute to the risk of infection.

Having recent accidental trauma does not necessarily mean the wound is dirty or infected; trauma can occur without introducing infection if the wound is properly cleaned and managed. The presence of sutures alone does not determine the cleanliness or infection status of a wound; sutures can be used on clean or infected wounds depending on the situation. Fresh, uncontaminated tissue indicates a clean wound environment, which is the opposite of what characterizes a dirty or infected wound.

Thus, the defining characteristic of a dirty or infected wound is the presence of retained devitalized tissue, as it directly relates to the increased risk of complications in wound healing.