A peak flow meter
A peak flow meter (born. Peak Flow) - method of functional diagnostics to determine the peak forced expiratory volume velocity. In other words, this method helps you to estimate how fast a person can exhale air, and thus to assess the degree of obstruction (narrowing) of the airways. Peak flow is very important for patients with asthma and chronic obstructive pulmonary disease, that it allows to evaluate the effectiveness of the therapy.
For this method of research there is a special device - a peak flow meter, which is a compact tube with graduated scale. Modern machine is convenient and easy to use, with the help of the patient can self-manage their condition, to calculate the dosage of the drugs and to prevent choking. Peak flow meters are for both adults and children. As a rule, children can use the device is already 4-6 years.
Patient self conducts research twice a day, and all indicators peak flow enters into your schedule by which to better understand the peculiarities of bronchitis and asthma.
Carrying peak flow
The procedure is done in a sitting position (or standing). You must first make a few calm breaths, and then made a deep breath, a peak flow meter mouthpiece firmly clasped lips and forced to make a deep breath. Thus it is necessary to hold the device is strictly parallel to the floor. For each session is required to make at least 3 breaths at intervals (2-3 min.) And select the maximum value.
Peak flow meters shall be held not less than 2 times a day - morning and evening. In the case of selection of a new therapy should be made a study three times a day. All figures are peak flow recorded in the diary or marked on special charts (that came bundled with the device).
Evaluation of the peak flow
Standards peak flow indicators are calculated individually for each patient, depending on their sex, age and height
. For children age accounted for only
. At the beginning of use of this device for 3 weeks made individually diagram with three colored zones
. To do this, the patient should be stable - without signs of bronchial obstruction
. When it reaches the maximum result (which should be close to normal), it is multiplied by the coefficient 0
. 8 - for example, if the maximum peak flow rate of 400 l / min, then 400 multiplied by 0, 8
. We get the 320 l / min
. The measurement value is higher than this indicator will refer to the "green zone" - that is, the normal level of the airway
. "Yellow Zone" - the maximum amount of research multiplied by a factor of 0, 5
. That is, 400 is multiplied by 0, 5 and obtain 200 ml / min (this will be the lower boundary of the yellow zone)
. In this case, the boundaries of the "yellow band" will range from 200 l / min to 320 l / min
. If the peak flow rate is in the area, it indicates that a correction of the therapy with the physician
. The index is less than the lower limit of the "yellow zone" refers to the "red zone"
. If the specified value is in it, then it suggests that the patient has a serious respiratory failure and need urgent intervention of a doctor
. About algorithm of actions in the patient record, which is in the "red zone", you must consult in advance with your doctor
Thus, a peak flow meter enables the control of respiratory disease in the home, and this helps to reduce the volume of drugs used. Using the zone allows to see the impending danger and prevent an emergency hospitalization.