📚 Deeper Dive · Scenario 2 of 57

The Bed, In Depth

Skin integrity & pressure-injury prevention — the why behind a well-made bed
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Coach Katie
You already lived this with Mrs. Carter. Now let's understand it deeply — how skin breaks down, how you prevent it with your hands, and how you pass it on. Learn it, live it, share it.
Learn It

What a pressure injury really is

A pressure injury (older name: pressure ulcer or bedsore) is damage to the skin and the tissue under it, caused by pressure — usually where a bone sits close to the surface. When a body part presses into a bed or chair, the tiny blood vessels in that spot get squeezed shut. No blood flow means no oxygen. Hold that long enough, and the tissue starts to die — sometimes from the inside out, before you ever see it on the surface.

Think of a garden hose you're kneeling on. Water can't get past your knee. Lift your knee every so often and the hose is fine. Kneel there for hours and the grass underneath turns yellow. Skin over a bony spot is the same — it needs the pressure lifted, regularly.

The four forces that break skin down

  • Pressure + time — the main event. The longer the squeeze, the worse the damage.
  • Shear — when the skin sticks to the sheet but the bones slide underneath (like when the head of the bed is up and the patient slowly slides down). It tears the tiny vessels deep in the tissue — which is why we keep the head of the bed at or below 30° when the patient's condition allows, and turn to a 30° side-lying tilt instead of a full roll onto the hip.
  • Friction — skin dragging across a surface, rubbing the top layer raw.
  • Moisture — sweat, urine, or wound drainage softens skin and makes it far easier to injure.
That wrinkled sheet under Mrs. Carter's hip? It concentrated all of her weight onto one narrow ridge — pressure — while moisture and a little sliding (shear) waited to make it worse. That's why a "chore" is really skin care.

Who is most at risk

The classic risk factors (the Braden Scale checks these): reduced mobility and activity, reduced sensation (can't feel the pressure), moisture on the skin, friction & shear, and poor nutrition. Mrs. Carter — immobile, on bed rest, rarely turning — checks several boxes at once.

How we describe the damage

The earliest sign is non-blanchable redness: press the red spot, and if it does not turn white, the blood flow is already compromised — that's a Stage 1 pressure injury, even with the skin still intact. In darker skin tones, a Stage 1 injury may not look red and may not blanch, so also compare the spot to the surrounding skin for changes in temperature (warmth or coolness), firmness, and color. Intact skin that looks purple or maroon suggests a deep-tissue pressure injury, not Stage 1. If it does blanch (whitens, then refills), tissue is still perfused — a warning to offload now. Deeper stages involve open skin, and some damage is hidden under intact skin (deep-tissue injury). You don't have to stage it perfectly as a student — you have to see it, protect it, and report it.