An indicator on the meter moves in response to the force of your breath to a spot along a numbered scale.Ĭonsistent use of a peak flow meter can help you keep track of how well asthma is being controlled. The meter measures the force you expel air in liters per minute (L/m). Peak flow meters have a mouthpiece you forcefully blow into with one powerful breath. Your doctor may recommend using a peak flow meter daily or several times a day, as part of a personalized asthma action plan for managing symptoms. PEFR is the maximum speed you’re able to use when blowing air out of your lungs. 2016 2636:1–4.They’re usually used by people with asthma to measure peak expiratory flow rate (PEFR or peak flow). Use of spirometry among chest physicians and primary care physicians in India. Vanjare N, Chhowala S, Madas S, Kodgule R, Gogtay J, Salvi S. Determinants of underdiagnosis of COPD in national and international surveys. Lamprecht B, Soriano JB, Studnicka M, Kaiser B, Vanfleteren LE, Gnatiuc L, et al. Overdiagnosis of asthma in obese and nonobese adults. doi: 10.1186/1471-.Īaron SD, Vandemheen KL, Boulet LP, McIvor RA, FitzGerald JM, Hernandez P, et al. (Correcting) misdiagnoses of asthma: a cost effectiveness analysis. Pakhale S, Sumner A, Coyle D, Vandemheen K, Aaron S.
Prevalence, risk factors and underdiagnosis of asthma and wheezing in adults 40 years and older: a population-based study. Gonzalez-Garcia M, Caballero A, Jaramillo C, Maldonado D, Torres-Duque CA. Breathlessness, cough and wheeze were the minimal symptoms required for COPD diagnosis, while the length of asymptomatic periods was most helpful in distinguishing asthma from COPD. They assessed 189 patients using this method, and found it aided diagnosis with high sensitivity and specificity. To determine a viable alternative method for differentiating between these diseases, Rahul Kodgule and colleagues at the Chest Research Foundation in Pune, India, trialed a simplified version of two existing symptom questionnaires, combined with peak flow meter measurements.
In clinical settings where access to specialist equipment and knowledge is limited, it can be challenging for doctors to tell the difference between asthma and chronic obstructive pulmonary disease (COPD). Mini-spirometers are useful in detection of obstructive airways diseases but FEV 1 measured is inaccurate.ĭIFFERENTIATING CONDITIONS IN POORLY-EQUIPPED SETTINGS: A simple questionnaire and peak flow meter measurements can help doctors differentiate between asthma and chronic lung disease. Peak flow meter with few symptom questions can be effectively used in clinical practice for objective detection of asthma and chronic obstructive pulmonary disease, in the absence of good quality spirometry. At a cut-off of 0.75, the FEV 1/FEV 6 had the best accuracy (Sn 80%, Sp 86%) to detect airflow limitation. Respiratory symptoms with PEF < 80% predicted, had Sn 84 and Sp 93% to detect OAD. A peak expiratory flow of < 80% predicted was the best cut-off to detect airflow limitation (Sn 90%, Sp 50%).
"Asymptomatic period > 2 weeks" had the best sensitivity (Sn) and specificity (Sp) to differentiate asthma and chronic obstructive pulmonary disease. "Breathlessness > 6months" and "cough > 6months" were important symptoms to detect obstructive airways disease. One eighty nine patients (78 females) with age 51 ± 17 years with asthma (115), chronic obstructive pulmonary disease (33) and others (41) completed the study. Physician made a final diagnosis of asthma, chronic obstructive pulmonary disease and others. Spirometry was repeated after bronchodilation. Two hundred consecutive patients with respiratory complaints answered a short symptom questionnaire and performed peak expiratory flow measurements, standard spirometry with Koko spirometer and mini-spirometry (COPD-6). However, the accuracy of these tools together, in clinical settings for disease diagnosis, has not been studied. Peak flow meter with questionnaire and mini-spirometer are considered as alternative tools to spirometry for screening of asthma and chronic obstructive pulmonary disease.
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