A Tight Plaster Cast in a Class 9 Student
Sunita, 14, is a Class 9 student in a block town. Eleven days ago she fell while cycling and broke the bone in her left forearm; the doctor at the CHC set it and put on a plaster cast running from below the elbow to the knuckles. For the last two days she has complained that the cast feels tight, that her fingers tingle and look pale, and that she cannot fully straighten them. Her mother notices a sour, musty smell near the wrist end of the cast and wants to sprinkle talcum powder inside it and oil the dry skin at the edges. Sunita also has an itchy rash in the armpit and groin that she is embarrassed to mention. Her father says the cast will be removed in three more weeks, so they should simply wait. The family lives 18 km from the CHC and the only bus leaves at 7 a.m.
1. Sort the findings in this case into 'needs same-day medical review' and 'expected/minor', and explain the reasoning behind your sorting.
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Needs same-day review
- Tightness, tingling, pallor and inability to straighten the fingers together are the pressure signs of a limb squeezed inside a rigid cast: pain, pallor, paraesthesia and early weakness. Plaster cannot stretch, so swelling raises tissue pressure, and blood flow and nerve conduction fail. Nerve and muscle damage can become permanent within hours, which is why this cannot wait three more weeks.
- The sour, musty smell near the wrist suggests trapped sweat, macerated skin or infection under the cast. It must be inspected by a doctor, and the cast may need to be split or changed.
Expected/minor
- Dryness and flaking at the cast edges, mild itching and a heavy feeling are normal.
- The itchy armpit and groin rash is most likely a fungal infection worsened by sweat and occlusion. It is uncomfortable and needs treatment, but it is not an emergency.
Rule applied: judge by whether function is affected. Colour, warmth, sensation and movement tell you whether to wait or to go now; the smell adds a second reason to go today.
2. What should the family do and not do at home for the cast and the skin before and after the hospital visit? Give reasons for each instruction.
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Do
- Keep the cast dry; a wet cast softens, loses strength and traps moisture against the skin.
- Elevate the forearm on a pillow when sitting or lying, so gravity helps drain swelling instead of pushing it into the cast.
- Let her move the fingers and thumb gently many times a day; this keeps muscles and joints working and helps circulation.
- Check the fingers twice a day for colour, warmth and capillary refill (press a nail, release, count the pink returning), and ask her to report numbness at once.
- Wear loose cotton sleeves; for the armpit and groin rash, keep the skin dry and get an antifungal from the MO rather than a roadside powder.
Do not
- Do not push talcum powder, cotton or sticks inside the cast: whatever goes in cannot come out, it clumps with sweat and invites infection, and scratching with a stick can break the skin.
- Do not oil the cast edges: oil softens the plaster and macerates skin.
- Do not cut, chip or re-wrap the cast yourself.
Practical plan: do not wait for the 7 a.m. bus; contact the ASHA or call 108, or borrow a vehicle today, and carry the prescription and X-ray.