Mechanics of Breathing (Lung Tests)
Inspiration and expiration of air entering or exiting the factors that facilitate or complicate related to respiratory mechanics. These factors are collected in 3 groups: 1 The flexibility of the lungs, 2 bronşiyoUerde bronchus and air flow resistance, 3 frictional resistance changed the shape of the thorax and lung tissues.
A test that measures lung compliance flexibility. Shows the relationship between pressure and volume changes. Normally, lung compliance is 0.2 L/smH20. Reduction in water pressure in the lungs and pleura in other words, one part expands 0.2 liter (0.2 liters of air into the lungs) or the increase in pleural pressure in the lungs, a portion of water shrinks 0.2 liter (0.2 liter air out the lungs). Compliance is less than the decreased flexibility of the lungs (fibrosis, silicosis, mitral stenosis).
Airways resistance assessed by measuring the relationship between air flow and pressure. Normally, airway resistance H20/L/sani-yedir 1.6 sm. In other words, a second input or output of 1 liter of air breathing ways to be a force for the 1.6 portion of water pressure. Respiratory resistance emphysema, asthma, obstructive diseases, such as increases. Tests that measure pulmonary mechanics is done in laboratories with sophisticated organized and well-trained professionals. Therefore, these tests can be measured more easily and instead of showing the change of respiratory mechanics impairment tests in parallel, for example, forced vital capacity, maximal expiratory flow-volume curves, maximal respiratory capacity is used.
Forced vital capacity (FVC), forced vital capacity at this time is called. Vital capacity is done as fast as possible. FVC test examined the relationship between volume and time. Normally ZVK'nın 75% in one second (ZVKl), 85% second per second (ZVK2) and 95% of the third second (ZVK3) is expired. Practical and important test for the evaluation of obstructive abnormality ZVKl particular, decreases in parallel with an increase in obstructive abnormality. FVC and maximal expiratory flow curve measured maximal mid-expiratory flow the other tests used to assess respiratory mechanics.
Maximal expiratory flow-volume curves (MEAV), forced vital capacity as measured by these tests, ie, after a maximal inspiration and maximal expiration flow-volume relationship evaluated quickly. Especially maximal expiratory flow curve MEAV (Vmax) and the measured flow in the middle of FVC (V50) evaluation of obstructive and restrictive abnormalities practical dimensions. Normally, about 8L/saniye Vmax, approximately 4L/sa-niyedir V50. Normal size increases with Vmax and V50, decreases with increasing age.
FVC, and bronchodilator MEAV curves measured before and after treatment of obstructive amormaliğin lürse improvement is evaluated. Disease diagnosis and detection of curves in progmozunun MEAV FVC and pulmonary function tests.
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