Extremely low doses of carbon monoxide - a dangerous gas found in car exhaust and produced by faulty heating equipment - may help ease symptoms of asthma and chronic obstructive pulmonary disease (COPD), suggests a study by researchers at the University Medical Centre at Groningen in the Netherlands.
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The study included 18 people who were given a low dose of carbon monoxide for two hours on four consecutive days. When the researchers checked the level of a certain type of immune cell linked to inflammation in lung mucus, they found it had decreased by about one third, on average, in the participants, BBC News reported. In addition, the volunteers' lungs seemed to become more resistant to the effects of an irritating chemical.
The study was published in New Scientist magazine. The Dutch team plans to conduct more studies with larger numbers of people.
One expert told BBC News he has serious concerns about the safety of this kind of treatment.
"The difficulty with carbon monoxide is that there is a fine balance between levels that influence COPD, and toxic levels, and it would be very hard to gauge a safe dose for patients. This makes it potentially quite dangerous," said Dr Paolo Paredi, of the National Heart and Lung Institute, in Great Britain. – (HealthDayNews)
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