Croup
What is croup?It is an infection involving the larynx (the voice box), the trachea, (wind-pipe) and the bronchus (air tube) - so it is also known as laryngo-tracheo-bronchitis. The infection causes the lining of the airways (larynx, trachea and bronchus) to become swollen and this narrows the airway. This narrowing causes obstruction to airflow and this obstruction causes the symptoms of croup.
What causes the infection?The infection is usually caused by a virus - the most common one is Parainfluenzae type 3 virus. There are some infections caused by bacteria that can look similar, but they are called other names (epiglottitis, tracheitis).What are the symptoms of croup?What is the treatment of croup?As it is caused by a viral infection, there is no specific treatment for the infection. General measures like keeping fluids up and giving Paracetamol (Acetaminophen) or Ibuprofen will often be enough. When stridor occurs or there is increased work of breathing, there are other medications that can be given. Most commonly, we give a steroid called dexamethasone by mouth or intramuscular injection (just one dose is enough). Alternatively, a steroid called budesonide can be given by a nebulizer (again just one dose is needed). These steroids (which mimic the body's natural steroids) act to calm the inflammation in the airway and reduce the swelling of the lining of the airway, thereby reducing the obstruction to airflow.If the obstruction is severe, there are other treatments, like nebulized epinephrine (adrenaline) that can be given to provide relief.If the condition was thought to be epiglottitis or tracheitis rather than croup, intravenous antibiotics would be necessary.
Is this infection dangerous?In most cases, it isn't dangerous and most children will need no more than a dose of steroid like dexamethasone or budesonide. However, the obstruction to the airway can be severe enough to compromise air getting to the lungs and in cases like these, hospital admission and artificial ventilation are necessary. Also, the bacterial infections have similar symptoms (epiglottitis and tracheitis) require hospital admission and artificial ventilation.What are the signs that I need to seek medical attention for my child with croup?
How long does croup last?Like most viruses, symptoms get worse for a few days, usually reach a peak about day 4 and then improve over a few days so the whole episode lasts 7 - 10 days. Children often develop stridor on about day 3 or 4, which is often the worst part of the infection.Why do my child's symptoms get worse at night?Many respiratory illnesses seem to get worse at night. It's not entirely clear why that happens but children with croup may have stridor one night and then be quite happy during the next day only to develop stridor again the next night. Don't panic - that's normal.What can I do at home to ease my child's distress?The most important thing is to keep calm and to try and calm your child. Crying only makes breathing more difficult. Although studies have not shown that humidified air works conclusively, some parents find going into the bathroom, turning on the hot taps to make a hot, steamy environment can calm their child. However, be careful with that steam not to burn or scald your child!! Remember, if you are worried about your child's breathing, get medical attention.
ReferencesJohnson D. Clinical Evidence, BMJ. 2004
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