breath test

The breath test is a method of performing respiratory muscle tension, expiratory flow rate, repeated breath test, and judging whether there is a respiratory disease according to the test result. 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). Basic Information Specialist Category: Respiratory Examination Category: Other Inspections Applicable gender: whether men and women apply fasting: not fasting Tips: Repeated breathing tests are not allowed in patients with severe heart failure and respiratory insufficiency. Normal value Repeated breath test 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. >10.5mv%, often means that the ventilation function is reduced. Clinical significance Abnormal results: reduced ventilation function is seen in inadequate ventilation, diffuse function damage, pulmonary arteriovenous shunt, ventilatory and blood flow imbalance (ie, increased physiological air volume), uneven gas distribution and anemia, muscle disease, airway Reversible stenosis and lead to difficulty breathing. People who need to be examined: chronic bronchitis, obstructive emphysema and patients with dysfunction, patients with muscle disease, suspected symptoms of asthma, etc. Low results may be diseases: chronic gastritis in the elderly, pregnancy with peptic ulcer, glucan enteropathy, blind sputum syndrome, intestinal malabsorption syndrome, peptic ulcer in the elderly, peptic ulcer in children, Helicobacter pylori infection in children , children with chronic gastritis, malabsorption syndrome precautions Forbidden before examination: Pay attention to normal eating habits and pay attention to personal hygiene. 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. Determination of respiratory muscle tone: Let the patient use a pressure gauge for forced inhalation and exhalation. This test has a certain predictive value for whether mechanical ventilation patients can be offline. Expiratory flow rate measurement: The maximum expiratory flow rate that can be achieved in the first 10 milliseconds after the subject inhaled to the total amount of lungs. The expiratory flow rate of normal and asthma patients has a cyclical change in day and night. The morning value is the lowest, and the afternoon value is the same. The highest but 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%, the expected expiratory flow rate is corrected according to height and age. However, the actual 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, with a certain range of deviations or different from person to person. Therefore, it is recommended that the expiratory flow rate value used to evaluate the treatment should be based on the patient's personal best value. Exhalation flow rate maintained at more than 80% of the individual's best value suggests that asthma is well controlled. Not suitable for the crowd Inappropriate people: Repeated breathing tests are not allowed in patients with severe heart failure and respiratory insufficiency. Adverse reactions and risks Nothing.