Explain croup and its home care to a worried parent — OSCE

Candidate instructions

You are the paediatric registrar. A 2-year-old boy with moderate croup was given a single dose of oral dexamethasone two hours ago and has settled — no stridor at rest, happy and drinking. His mother has ten minutes with you before discharge. She wants to understand, in plain language: (1) what croup is; (2) why he is going home after "only one dose"; (3) whether she should steam up the bathroom or buy a humidifier; and (4) exactly what to watch for and when to come back. Explain with empathy, check understanding, and agree a clear plan. [1]

Encounter

Mother: "What actually is croup? That barking cough terrified me." [1]

Registrar: "It is a really frightening noise, so I completely understand. Croup is a common virus that swells the lining of the voice box and windpipe, right at the narrowest part of a young child's airway. That swelling is what makes the barking cough, the hoarse voice and the harsh noise when he breathes in. It is almost always caused by a cold-type virus, it is very common at his age, and the good news is that it nearly always settles over a day or two." [1]

Mother: "But you've only given him one dose of steroid. Is that really enough?" [2]

Registrar: "It is, and I know that feels surprising. A single dose of this steroid, dexamethasone, reduces the swelling in his airway over the next several hours, and the effect lasts long enough to carry him through the illness. Good studies show that one dose reduces how severe croup gets, cuts the chance of needing to come back, and shortens hospital stays — even in milder croup. Giving more doses doesn't add benefit, so one dose is genuinely the right treatment, not a shortcut." [2] [4]

Mother: "My mother says to sit him in a steamy bathroom. Should I?" [3]

Registrar: "That is very common advice, but it is one of those remedies that turns out not to work when it's been properly tested — steam and humidifiers don't improve croup, and hot steam can actually scald or upset a child. So please don't feel you have to do it. The things that genuinely help are the steroid he's had, keeping him calm and comfortable, and keeping a close eye on his breathing. If he gets upset, cuddling and calming him actually eases the noise, because crying makes the airway narrower." [3] [1]

Mother: "So when do I need to bring him back?" [1]

Registrar: "Here is the clear plan. Come back urgently — call an ambulance if needed — if you hear that harsh noise when he is calm and resting, not just when he cries; if his breathing looks harder, with the skin sucking in around his ribs or at the base of his neck; if he goes pale, floppy or drowsy, or his lips look blue; or simply if you are worried. One more thing to expect: croup often flares again the next night, so don't be alarmed if that happens — use the same calm approach and the same warning signs. Shall I write these down for you?" [1]

Mother: "Yes, please. That makes it much clearer." [1]

Registrar: "I'll give you a written croup fact sheet with those warning signs and our number. To check I've explained it well — can you tell me the three main things that would make you bring him straight back?" [1]

Examiner debrief

A strong candidate explains croup in plain language (viral swelling of the narrowest part of the airway), justifies the single steroid dose with the evidence rather than dismissing the mother's concern, gently corrects the steam myth without being patronising, and gives concrete, specific return advice with an explicit warning that croup can recur the next night. They keep the child calm, check understanding with teach-back, and provide written information. Pitfalls include agreeing to steam to please the parent, vague safety-netting ("come back if worse"), and failing to warn about the typical next-night flare. [1] [3]