expiratory flow

The expiratory flow rate measurement is an indicator that mainly reflects the degree of obstruction of the airway. It is more sensitive than the clinical symptoms and objectively reflects the degree of airway obstruction and changes in the condition of asthma patients. Monitoring the expiratory flow rate can help to detect early signs of deterioration before symptoms appear. Basic Information Specialist Category: Respiratory Examination Category: Other Inspections Applicable gender: whether men and women apply fasting: not fasting Analysis results: Below normal: Normal value: no Above normal: negative: The airway is non-blocking. Positive: The airway is reversible and causes difficulty in breathing. Its clinical manifestations are shortness of breath, cough, sputum, difficulty breathing, and wheezing sounds can be heard in the lungs, especially when exhaling. Tips: If the patient has nervousness, strenuous exercise, crying, etc., it needs to be measured after stabilization. Normal value The airway is non-blocking. Clinical significance Abnormal results: airway reversible stenosis and lead to difficulty breathing, its clinical manifestations of shortness of breath, cough, sputum, difficulty breathing, can hear wheezing sounds in the lungs, especially when exhaling, wheezing sound is more obvious. People who need to be examined: those with suspected symptoms of asthma. Positive results may be diseases: idiopathic pulmonary fibrosis, bronchial asthma in the elderly, asthma in children, chronic bronchitis in children, upper airway obstruction, pregnancy with asthma, idiopathic pulmonary fibrosis in the elderly, mixed chronic altitude sickness, allergy Asthma, fungal allergic asthma precautions Forbidden before examination: Pay attention to normal eating habits and pay attention to personal hygiene. Requirements for inspection: 1. The rate of breathing is affected by consciousness and does not have to be told to the patient during the measurement. 2. If the patient has nervousness, strenuous exercise, crying, etc., it needs to be measured after stabilization. 3. Patients with irregular breathing and infants should be measured for 1 minute. Inspection process The expiratory flow rate is the maximum exhalation after the subject inhales to the total amount of the lungs. The highest expiratory flow rate 2 that can be achieved in the first 10 milliseconds, the expiratory flow rate of normal people and asthma patients have periodic changes in day and night, and the lowest value in the morning is the highest in the afternoon. However, the normal person has a small change range, and the expiratory flow rate fluctuation rate is less than 10%; while the asthma patient's expiratory flow rate fluctuates more than 20%-30% or even 50%, and the expected expiratory flow rate is corrected according to height and age. The measured value of the expiratory flow rate depends mainly on the individual's exertion and the strength of the respiratory muscles. Therefore, the measured values ​​of the expiratory flow rate of many patients are always higher or lower than the expected value, and there is a certain range of deviation or varies from person to person. Therefore, it is recommended that the value of the expiratory flow rate for evaluating treatment should be based on the patient's individual optimal value. The expiratory flow rate is maintained at more than 80% of the individual's best value, suggesting that asthma is well controlled. Not suitable for the crowd Inappropriate crowd: No. Adverse reactions and risks Nothing.