New research shows that GPs need to recognise occupational asthma

October 8, 2012, University of Birmingham

A new report published today in the scientific journal, Occupational Medicine, finds that many people who develop work related asthma are not correctly diagnosed by GPs. Work related factors cause one in ten cases of asthma in adults but an audit of patient records suggests that GPs do not recognise this in three quarters of patients.

Every year up to 3000 people develop because they are exposed to materials at work. Early diagnosis of occupational asthma and avoidance of further exposure can lead to complete recovery. However, failures to diagnose the condition and delays in accessing specialist advice mean that two thirds of sufferers never make a full recovery.

Researchers from the University of Birmingham conducted an audit of the of working age asthmatics. Occupation was only recorded in 14% of the cases and in nearly all cases (98%) GPs failed to record if they had asked simple screening questions about whether their asthma symptoms improved at weekends and on holiday.

Dr Gareth Walters, the lead author, said "Most workers with new present to their GPs first, so it is important for working in primary care to recognize when these symptoms might be caused by or related to work. Currently occupational asthma is very costly to the NHS and to society - and an early diagnosis can prevent on-going debilitating symptoms, time off work and financial loss for the worker."

The Society of Occupational Medicine who published the study urged GPs to always question patients who present with about their job, the materials they work with and whether their symptoms improve when they are away from work. They should also be aware of those trades that carry particular risks such as vehicle paint sprayers, bakers, laboratory workers and workers in the chemical industry. The commonest causative agents are isocyanates, flour, cutting oils, laboratory animals and insects, enzymes and wood dusts.

"Highlighting the prevalence of occupational asthma is absolutely key, as too often work-related factors are overlooked," said Dr Richard Heron, President of the Society of Occupational Medicine. "About 70% of the UK workforce does not have access to occupational health care. This makes it vital that general practitioners are assessing asthma patients for potential work-related causes and referring to specialists where appropriate. More importantly, employers need to be aware of those substances that may cause asthma and where possible remove them or minimise exposure."

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