Thus, this study aimed to determine age- and sex-specific reference values of PEF in the middle-aged and elderly Chinese population. However, few studies have focused on the reference of PEF in China, especially in middle-aged and elderly people. 4Disease Prevention and Control Center of Shahekou District of Dalian City, Dalian, Chinaīackground: Peak expiratory flow (PEF), as an essential index used for screening and monitoring asthma, chronic obstructive pulmonary disease, and respiratory mortality especially in the elderly, is recommended for low-resource settings in low- and middle-income countries.3Safety and Environment Protection Technology Supervision Center, Liaohe Oilfield Company, Panjin, China.2Department of Otorhinolaryngology-Head and Neck Surgery, Shengjing Hospital, China Medical University, Shenyang, China. 1Department of Clinical Epidemiology, Shengjing Hospital of China Medical University, Shenyang, China.Always follow your healthcare provider's suggestions about your peak flow rate.Chao Ji 1, Yang Xia 1, Huixu Dai 1, Zhiying Zhao 1, Tiancong Liu 2, Shuhui Tong 3, Xiaohang Zhang 4 and Yuhong Zhao 1 * Some healthcare providers may suggest zones with a smaller range, such as 90 to 100 percent. Contact your healthcare provider right away and if symptoms don’t improve, call 911 or go the nearest emergency room. Take your quick-relief medicine right away. This zone indicates that there is severe airway narrowing. Red Zone: Less than 50 percent of your usual or "normal" peak flow rate signals a medical alert.Take the additional medicine(s) listed in the yellow zone of your asthma action plan. This zone indicates that your airways are narrowing, and you need to take action. Yellow Zone: 50 to 80 percent of your usual or "normal" peak flow rate signals caution.A reading in this zone means that your asthma is in good control. Green Zone: 80 to 100 percent of your usual or "normal" peak flow rate signals all clear.Your healthcare provider may suggest other zones to follow. Keep in mind that recognizing changes from "normal" is important. In general, a normal peak flow rate can vary as much as 20 percent.īe aware of the following general guidelines. The colors of a traffic light – green, yellow, red – are used to represent the three zones. Peak flow rates are commonly split into three zones. Discuss the readings with your healthcare provider. Step 7: Keep a chart of your peak flow rates. Some people measure peak flow both before and after taking medication. You may want to measure your peak flow rate before or after using your medicine. One suggestion is to measure your peak flow rate twice daily between 7 and 9 a.m. You and your healthcare provider can determine the best times. Step 6: Measure your peak flow rate close to the same time each day. You can't breathe out too much when using your peak flow meter, but you can breathe out too little. Step 5: Record the highest of the three ratings. (You know you have done the routine correctly when the numbers from all three tries are very close together.) Step 4: Repeat the entire routine three times. Step 3: The force of the air coming out of your lungs causes the marker to move along the numbered scale. Blow a "fast hard blast" rather than "slowly blowing" until you have emptied out nearly all the air from your lungs. In one breath, blow out as hard and as quickly as possible (like you are blowing out candles on a birthday cake). Be sure to keep your tongue away from the mouthpiece. Close your lips tightly around the mouthpiece. Put the mouthpiece of the peak flow meter into your mouth. Step 1: Before each use, make sure the sliding marker or arrow on the Peak Flow Meter is at the bottom of the numbered scale (zero or the lowest number on the scale).
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