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mercredi 19 février 2014

Using A Spirometer To Identify Breathlessness

By Serena Price


Shortness of breath is a common reason why people visit the doctor. It can also be a diagnostic minefield. One of the first tests to be performed will be the use of a spirometer to identify the presence of abnormal breathing patterns, which may be either restrictive or obstructive. The instrument is a general term for a wide variety of strategies for measuring the movement of air into and out of the lungs (pressure transducers, ultrasound, water gauge). Modern spirometers, or pulmonary function monitors (PFMs) may be PC-based or standalone devices.

Various lung function tests are employed to eliminate serious lung conditions such as bronchitis, asthma and emphysema. They can determine the cause of breathlessness, investigate the effects of medication or airborne contaminants on the lungs and to watch the progress of treatment. They are conducted prior to surgery on the lungs to provide a benchmark of pulmonary function.

Noted Roman physician, Claudius Galen, was the first to assess lung function. Some time during the second century AD, he got a boy to breath in and out into a bladder. Years later, people used inverted bell jars in water. Modern instruments include whole body plethysmography, peak flow meters and a device called a pneumotachometer.

Most causes of shortness of breath are benign and easily reversible. First, it is essential to rule out more sinister causes. The Mayo Clinic defines shortness of breath as a severe tightening of the chest and a sensation of being suffocated. There may be a single episode or there may be a pattern of episodes.

There are a handful of "red flag" signs which, when they occur at the same time as breathlessness, may indicate a serious underlying condition. These include persistent tiredness and pallor, a chronic wheeze or cough, ankle swelling, a pain that gets worse with exercise, breathlessness that worsens when lying down, any other unusual or recurring symptoms. A history of working with hazardous chemical fumes, asbestos, wood dust or in a coal mine is also something worth mentioning to the doctor.

Asthma is a chronic condition involving inflammation of the airways. It is potentially serious and may be fatal. According to the CDC in Georgia, at any one time in the United States there are 18.9 million non-institutionalized adults diagnosed with this condition. This amounts to 8.2% of the population.

Once any serious cause has been ruled out, most cases of breathlessness are related to one of two causes, bad respiratory habits and weak muscles; or trigger points, or muscle knots. These are both minor and easily treatable. The treatment is safe, free and almost fun. It consists of identifying and massaging trigger points.

A spirometer is an instrument that has been in use for two millennia to detect the cause of breathlessness. It can determine whether it is present and identify whether it is restrictive or obstructive but requires further investigations to rule out the presence of any serious conditions, such as emphysema, asthma or bronchitis. Once these have been eliminated from consideration, they may be attributable to either trigger points or incorrect breathing patterns.




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