Sunday

A few examples of asthma triggered by inhalant allergy

James was eight years old when he first came to the Allergy Clinic. His history is quite classical and demonstrates much of what you have just read. In the first place, he came from an allergic family. His mother and several cousins had a history of hay fever. He himself had a history of eczema as a baby, but this had cleared up long ago. 'He's sneezing and wheezing!' his father said. 'And he coughs. Boy, does he cough, especially at night when we're all trying to sleep! He was taking the usual inhalers but still getting into trouble. Like most asthmatic children, he got a bit of a wheeze when he ran about. His father, unfortunately, was a chain-smoker, and this was sure to make things worse. Skin-prick tests showed that James was allergic to the ubiquitous house dust mite, and had a lesser sensitivity to silver birch pollen. His father promised to smoke only in the back garden, and he took careful note of the measures required to reduce the dust mite allergen in James's bedroom. The boy then had one dose of desensitisation and improved so dramatically that his mother thought he was 'cured'! However, it wore off after a few months (as expected) and he is now well into his course of jabs and on the road to more permanent relief. Asthma is often triggered by the house dust mite!

Declan was a businessman in his late thirties. He had asthma as a young lad for a few years and then grew out of it. However, it came back to him last autumn, together with the symptoms of rhinitis. It wasn't particularly bad, he said, more of a nuisance than anything else. Again, skin tests confirmed his allergy to dust mites. He had no other allergy. Desensitisation brought about a great improvement. The last time I saw him for a booster dose he told me that he had stopped his inhalers altogether. Asthma in adults can also be triggered by house dust mites!

Helen is a university student coming up to her summer exams. She is 'really fed up today' because she has asthma. In fact, she tells me that she gets asthma at this time every year, and it interferes with her study. She also gets the other symptoms of hay fever. Once the summer holidays are over, she has no asthma. Skin tests confirm her allergy to grass pollen, and the fact that she is not allergic to other allergens. She has 'hay asthma1. Asthma is sometimes triggered by seasonal allergens!



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