Wound
Disruption of living tissue requiring professional evaluation and management.
A wound is a break or injury in living tissue, including skin, mucous membranes, or organs. It can happen suddenly from direct trauma—like a cut, burn, or chemical exposure—or it can form slowly because of an underlying illness, such as diabetes, poor blood flow in veins or arteries, or an immune system disorder. How a wound looks depends on where it is, what caused it, how deep it is, whether it happened quickly or over time, and if it is contaminated. Because treatment depends on the type of wound, a healthcare professional must evaluate it thoroughly for proper care. Normally, all wounds go through a healing process with four stages: stopping bleeding (hemostasis), inflammation, new tissue growth (proliferation), and tissue remodeling. Things like age, oxygen supply to the tissue, stress, other medical conditions, and certain medications can slow or affect how fast a wound heals.
Wounds are broadly grouped as acute or chronic, based on how long since the injury and whether they are moving through the normal healing stages. Both types can be further sorted by cause, severity, depth, and whether the wound bed is clean or infected. Several classification systems exist to describe wounds and guide treatment, including the CDC’s Surgical Wound Classification, the International Red Cross Wound Classification, the Tscherne classification, the Gustilo-Anderson classification for open fractures, and the AO soft tissue grading system.
An acute wound results from direct trauma and moves through the four healing stages on a typical timeline. Hemostasis lasts from minutes to hours after injury. The inflammatory phase follows, lasting 1 to 3 days. Proliferation lasts from a few days up to a month. The final remodeling phase usually lasts about 12 months but can continue up to 2 years. Acute wounds are either open or closed. An open wound has broken skin, exposing underlying tissue. A closed wound damages tissue underneath but leaves the skin intact.
Open wounds include incisions (from a clean, sharp object like a knife or glass), lacerations (irregular tears from blunt force, often confused with incisions), abrasions (scrapes that remove the top skin layer, often from a slide on rough surfaces), avulsions (when a body part is forcibly torn away, sometimes called degloving for skin), puncture wounds (from a pointed object like a nail or tooth), penetration wounds (an
- classification_types
- Acute and chronic
- acute_wound_phases
- Hemostasis, inflammation, proliferation, remodeling
- chronic_wound_threshold
- Over three months
- common_causes
- Diabetes mellitus, venous/arterial insufficiency, immunologic disease, pressure
- key_classification_systems
- CDC Surgical Wound Classification, Gustilo-Anderson, Tscherne, AO, NPIAP
Quick Facts
- Field
- Emergency medicine / Plastic surgery
Facts from the source article.
Lore & Background
Wounds are broadly classified as acute or chronic based on time from injury and progression through normal healing stages. Acute wounds result from direct trauma and follow an expected timeline: hemostasis (minutes to hours), inflammation (1–3 days), proliferation (days to a month), and remodeling (up to 2 years). Acute wounds are further divided into open wounds (skin disrupted) and closed wounds (skin intact). Open wounds include incisions, lacerations, abrasions, avulsions, puncture wounds, penetration wounds, gunshot wounds, and critical wounds such as large burns. Closed wounds include hematomas (contusions, petechiae, purpura, ecchymosis) and crush injuries.
Reader's Guide
Chronic wounds are arrested or delayed in normal healing, most often due to underlying disease. Diabetes mellitus impairs healing through hyperglycemia, neuropathy, microvascular complications, and immune dysfunction; up to 25% of diabetic patients develop non-healing wounds. Venous insufficiency causes blood pooling and a pro-inflammatory environment leading to venous ulcers, while arterial insufficiency (peripheral artery disease) causes wounds from poor blood inflow, typically on distal extremities. Immunologic diseases like rheumatoid arthritis and lupus impair the inflammatory phase, resulting in larger wounds and prolonged healing. Pressure ulcers (bedsores) develop from prolonged pressure, graded by the NPIAP system from stage 1 (erythema) to stage 4 (full-thickness damage to muscle/tendon/bone), with unstageable ulcers covered by eschar. Wound sterility is classified using the CDC's Surgical Wound Classification System. Age, tissue oxygenation, stress, medical conditions, and medications affect healing rate. Proper evaluation by a healthcare professional is essential for management.
Did You Know?
- Acute wound healing includes four stages: hemostasis, inflammation, proliferation, and remodeling, with remodeling lasting up to 2 years.
- Chronic wounds are often defined as those not progressing for over three months.
- Up to 25% of patients with diabetes mellitus develop non-healing wounds in their lifetime.
- Pressure ulcers can form in as little as two hours of immobility in a bedridden or sedated person.
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