Forced expiratory volume in one second/forced vital capacity ratio

The amount of forced exhalation in one second is the end of deep inhalation, and the amount of force exhaled at the fastest speed. The normal person exhaled the amount of force in one second = forced vital capacity. In the case of airway obstruction, the amount of forced exhalation in one second <forced vital capacity, obstructive ventilatory disorder, forced exhalation in one second, prolonged exhalation time, and exhaled time in restrictive ventilation disorder. The ratio of forced expiratory volume and forced vital capacity in one second can reflect the type and extent of ventilatory disorders. Basic Information Specialist classification: Respiratory examination classification: pulmonary function test Applicable gender: whether men and women apply fasting: not fasting Reminder: All bronchodilators should be discontinued two days before the test. Normal value >0.80. Clinical significance The normal person exhaled the amount of force in one second = forced vital capacity. In the case of airway obstruction, the amount of forced exhalation in one second <forced vital capacity, obstructive ventilatory disorder, forced exhalation in one second, prolonged exhalation time, and exhaled time in restrictive ventilation disorder. The ratio of forced expiratory volume and forced vital capacity in one second can reflect the type and extent of ventilatory disorders. Low results may be diseases: asthma, bronchial asthma, emphysema, obstructive emphysema, cough asthma, senile asthma, menstrual asthma considerations Two days before the examination, all the drugs for bronchodilation should be stopped, such as Shuchuanling, Bangfu, Meipuqing, aminophylline, Shufumei Lehui, Asami, Aichuan, etc., otherwise it will affect test result. Inspection process The subject took the standing position, pinched the nose, placed the mouth with the tube, first calmed the breath several times, and the subject took a deep inhalation to the lung total position, and then immediately exhaled with the maximum strength and the fastest speed until the residual gas The position can be measured by a conventional pulmonary function meter or by a micro-maximum expiratory flow meter. When the peak flow meter is measured, the PEF is displayed by the liquid crystal digital display or the pointer scale. Repeat once every 5 to 10 minutes, at least 3 times, and select the maximum PEF. Not suitable for the crowd Generally there are no special taboos. Adverse reactions and risks It generally does not cause complications and harm.