Clinical Mnemonics · Emergency & Trauma
DCAP-BTLS
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In 30 seconds
A head-to-toe checklist of signs to look for and feel for when examining each body region of a trauma patient, so no injury is missed.
The college version
A head-to-toe checklist of signs to look for and feel for when examining each body region of a trauma patient, so no injury is missed.
D — Deformities
Fracture or dislocation
An abnormal shape, position, or alignment of a bone or joint, most often from a fracture (displaced bone ends) or dislocation (joint surfaces no longer in contact). Assess for angulation, shortening, or rotation and compare to the uninjured side.
Physiology. Muscle pull and injury force move broken bone ends apart or sideways; a dislocated bone end leaves its socket — both change the limb's normal contour and length.
Safety. Check Circulation, Sensation, and Movement (CSM) below the injury before and after splinting; never attempt to reduce a deformity unless trained and ordered.
C — Contusions
Blunt trauma / bruising
Bleeding into soft tissue without a skin break, from blunt trauma that ruptures capillaries and small vessels. Bruising may appear hours later and migrate with gravity; location and pattern can hint at hidden deeper injury.
Physiology. Blunt force crushes small vessels between the object and underlying bone or muscle; leaked blood changes color as hemoglobin breaks down (red/purple to blue/green to yellow/brown).
Safety. Unexplained or unusual bruising (child, older adult, dependent patient) may signal abuse; in anticoagulated patients a small bruise can hide significant bleeding.
A — Abrasions
Friction / road rash
A partial-thickness wound from friction that removes the epidermis (and sometimes superficial dermis). Frequently contaminated with dirt or gravel and painful because superficial nerve endings are exposed.
Physiology. Friction scrapes away the protective skin barrier, exposing raw tissue and nerve endings; broken skin lets dirt and bacteria in.
Safety. Large or heavily contaminated abrasions can hide deeper injury (fracture, foreign body) beneath them; clean thoroughly to prevent infection and traumatic tattooing.
P — Punctures / Penetrations
Sharp or fast-moving object
Wounds from a pointed or fast-moving object that breaks the skin and travels into deeper tissues. The entrance wound may be deceptively small while organs, vessels, and nerves are damaged along the path. Always check for an exit wound.
Physiology. A narrow pointed object concentrates force on a tiny area so it penetrates easily; internal damage is determined by the object's energy and path, not the entrance-hole size.
Safety. Never remove an impaled object — it may be plugging a major vessel; stabilize it in place and log-roll to check the back.
B — Burns
Thermal / chemical / electrical / radiation injury
Tissue injury from thermal, chemical, electrical, or radiation sources, classified by depth (superficial, partial-thickness, full-thickness) and total body surface area (Rule of Nines for adults, Lund-Browder for pediatrics). Extent and depth drive resuscitation and transfer decisions.
Physiology. Heat denatures cellular proteins; chemicals destroy tissue directly; electricity heats tissue along its path (deep hidden injury); radiation damages cell DNA.
Safety. Electrical burns can look small but cause massive internal injury; for chemical burns brush off dry powder first, then irrigate — never neutralize with an opposing chemical.
T — Tenderness
Pain on palpation
Pain elicited by palpation — often the earliest and only sign of internal injury (e.g., splenic injury) or a non-displaced fracture. Palpate gently and systematically, watching for grimacing and guarding.
Physiology. Injured tissue releases inflammatory chemicals that sensitize pain nerve endings (hyperalgesia); pressure also moves injured structures, triggering pain.
Safety. Tenderness may be absent with altered mental status, spinal cord injury, or intoxication — do not rely on pain alone to rule out injury.
L — Lacerations
Torn skin / blunt-shearing force
A tear in skin and underlying tissue from blunt or shearing force (distinct from a clean knife incision). Assess depth, length, involvement of deeper structures, and bleeding.
Physiology. Blunt force splits skin stretched or crushed beyond its strength, damaging vessels and potentially disrupting tendons, nerves, and muscles depending on depth and location.
Safety. Lacerations over joints, the face, or hands may involve tendons or nerves — test function before closure; never probe blindly.
S — Swelling
Edema / bleeding into tissue
Edema from inflammation and bleeding after injury; can indicate fracture, sprain, contusion, or infection. Rapid or massive limb swelling raises concern for bleeding or compartment syndrome.
Physiology. Injury makes vessels leakier, moving blood and fluid into tissue to deliver healing cells; broken bones and torn vessels add bleeding to the swelling.
Safety. Severe, tense, rapidly worsening swelling in a closed space can signal compartment syndrome (a surgical emergency); report immediately — pulselessness is a late sign.
Memory aids
- D = Deformities
- C = Contusions
- A = Abrasions
- P = Punctures / Penetrations
- B = Burns
- T = Tenderness
- L = Lacerations
- S = Swelling
Quick review
- D = Deformities — Fracture or dislocation
- C = Contusions — Blunt trauma / bruising
- A = Abrasions — Friction / road rash
- P = Punctures / Penetrations — Sharp or fast-moving object
- B = Burns — Thermal / chemical / electrical / radiation injury
- T = Tenderness — Pain on palpation
- L = Lacerations — Torn skin / blunt-shearing force
- S = Swelling — Edema / bleeding into tissue
Eli explains
The same idea, in plain words
Explain it like I’m 10
When someone is hurt, their body gives off clues — it changes shape, bruises, swells, and hurts. DCAP-BTLS is a checklist of all the ways an injury can show itself, so rescuers check every spot the same way and don't skip anything.
D — Deformities. Your skeleton is a carefully built frame. A 'deformity' means a body part is bent, twisted, or hanging at a wrong angle — like a dropped picture frame. If it looks wrong, something underneath is probably broken or out of place.
C — Contusions. A contusion is a bruise. Tiny blood pipes under the skin break and leak a little blood, like spilling ink under a tablecloth — the skin stays whole but you can see the stain underneath.
A — Abrasions. An abrasion is a scrape — like falling and sliding on pavement so the top layer of skin is rubbed raw, like sanding the surface of wood. It hurts and may ooze but is not a deep cut.
P — Punctures / Penetrations. A puncture is a small hole from something sharp or fast — a nail, knife, glass, or bullet. The outside hole can be tiny, like a pin through a balloon, but the damage inside can be deep and serious.
B — Burns. A burn is skin (and sometimes deeper tissue) damaged by too much heat, harsh chemicals, electricity, or radiation — like cooking: a little heat warms, but too much destroys tissue.
T — Tenderness. Tenderness means 'it hurts when you press.' Pain is the body's alarm system: if a spot hurts when touched, something underneath is hurt even if you can't see it.
L — Lacerations. A laceration is a cut or tear with jagged edges — like tearing cloth rather than slicing it cleanly. Deep ones can cut muscles, tendons, nerves, or blood vessels underneath.
S — Swelling. Swelling is puffiness — the body sends extra fluid and blood to an injured spot, making it balloon up like a filling water balloon. It usually means something underneath got hurt.
Study tools & related lessonsKey vocabulary · Related
Key vocabulary
- D
- Deformities
- C
- Contusions
- A
- Abrasions
- P
- Punctures / Penetrations
- B
- Burns
- T
- Tenderness
- L
- Lacerations
- S
- Swelling
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