repeated breath test

The repeated breath test is carried out by the following principle. Under a certain degree of exercise and closed ventilation, a certain amount of air is repeatedly breathed, and the oxygen absorption amount per unit time and the carbon dioxide emission amount are measured to measure the ventilation function. Inappropriate people: more serious heart failure and respiratory insufficiency before the check: the time of the subject breathing air in the airbag should not exceed 20s, because the blood circulation time is 20s, if the breathing time exceeds this time, the vein Blood will be repeatedly circulated to the lungs, affecting the concentration of alveolar gas. Basic Information Specialist classification: Respiratory examination classification: pulmonary function test Applicable gender: whether men and women apply fasting: not fasting Reminder: The time of breathing air in the airbag should not exceed 20s, because the blood circulation time is 20s. If the breathing time exceeds this time limit, the venous blood will be repeatedly circulated to the lungs, affecting the concentration of alveolar gas. Normal value The normal oxygen volume percentage was 8.62±0.13 for males and 8.96±0.14 for females; the volume percentage of carbon dioxide was 8.33±0.98 for males and 7.83±0.10 for females. The measured alveolar oxygen concentration was 9.5 mv%, indicating that the ventilation function was sound >10.5 mv%, which often indicated that the ventilation function was reduced. Clinical significance Abnormal results The reduction of ventilation function is seen in insufficient ventilation, diffuse function damage, pulmonary arteriovenous shunt, ventilatory and blood flow imbalance (ie, increased physiological air volume), uneven gas distribution and anemia. Chronic bronchitis, obstructive emphysema, and related disorders with ventilatory dysfunction are needed in the population to be examined. Low results may be diseases: lung non-development or hypoplasia, recurrent pulmonary edema, chemical bronchitis precautions Before the examination, the time of the air in the airbag should not exceed 20s, because the blood circulation time is 20s. If the breathing time exceeds this time limit, the venous blood will be repeatedly circulated to the lungs, affecting the concentration of alveolar gas. Requirements for inspection: Actively cooperate with the doctor. Inspection process 1. Subjects rested for 10 min before the test and explained the test requirements to obtain cooperation. Check and prepare the test equipment and equipment. 2. Check the spirometer and inject 1000 ml of air into the rubber bladder. Turn the three-way switch to close the air bag to make the glue interface open to the atmosphere. 嘱 The subject has a gel interface, wear a nose clip, and use the mouth to breathe, then do the upper and lower movements on the 25cm high stool for 1min (about 30 times each time). 3. After the exercise is completed, quickly turn the three-way switch after exhaling, so that the gel interface and the rubber balloon are connected. The subject breathes the air stored in the airbag for 20s, and finally makes a big exhalation. Turn the three-way switch immediately to close the air bag access. 4. Sampling from the rubber balloon and analyzing the volume percentage of oxygen and carbon dioxide in the balloon. Not suitable for the crowd More serious heart failure and respiratory insufficiency are not suitable for this examination, and the subject will aggravate the condition due to excessive exhalation. Adverse reactions and risks This test is a non-invasive test and does not cause serious complications or other hazards.