2015-10-13
3896
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Конец формы
Ratio of the volume exhaled in the first second forced expiratory performed from a position of maximal inspiration to VC. Index Tiffno is a classic test by which revealed the presence of bronchial obstruction. The normal is 70-85 %. Index decreased to 55% Tiffno indicates moderate bronchial obstruction, from 54 to 40 % - indicates significant, less than 40% - of severe violations. Lack index Tiffno that this figure "works" only when normal value and VC gives overestimated results while reducing the VC. In cases of restrictive pathology Tiffno index can be increased and reaches 100%, ie, no longer reflects the presence of obstructive disorders.
Показатели спирометрии
Most indicators spirometry are expressed in percentage from the average physiological values. Rate varies within 80-120%. In decoding spirometry can be found such indicators:
• respiratory volume - the volume of air entering in one breath into lungs during quiet breathing out. Norm - 500-800;
• VC is vital capacity is the amount of light that comes out when you exhale. This figure is significantly reduced in the restrictive lung diseases;
• FEEL - accelerated vital capacity of the lungs. This indicator spirometry similar to the previous one, but exhale patient needs to produce at the highest speed possible and with maximum possible effort.
• FEV1 - forced expiratory volume in 1 second. The amount of air that comes out of the lungs in the first second of expiration, with maximum effort. These data spirometry in children and adults reflect the large Airways, expressed as a percentage of lung capacity. Norm forced expiratory - 75%.
• Index Tiffno. Percentage ratio of FEV1 to FVC. Its rate is 70% and more.
• Average flow speed. Measured in percent - 25-75%. Shows the condition of the small Airways. The volumetric rate is useful for early detection of obstructive disorders.
• Peak flow rate on the exhale. The maximum speed that people may show on deep breath.
• The airway. Depends on the efforts of the muscles, displays the state of the airway at the level of large bronchi, trachea.
Since all of these indicators are taken from the patient three times, when decrypting spirometry the doctor takes to analyze the best results and compares it to the normal values for the corresponding groups of people: taken into account the height, gender and age of the patient.
