Hyperventilation or exercise to induce asthma?
نویسندگان
چکیده
Bronchoconstriction was induced in asthmatic patients by means of isocapnic hyperventilation with dry air. Responses both within a day and between days did not differ significantly and corresponded closely with those observed after exercise. The mean fall in forced expiratory volume in one second (FEV1) observed with both techniques was equivalent to 36%. Isocapnic hyperventilation with dry air, as used in this study, was a potent stimulus and provoked a reproducible response. The method was physically less demanding than exercise and was more acceptable to patients.
منابع مشابه
Venous plasma histamine in exercise- and hyperventilation-induced asthma in man.
1. Venous plasma histamine was measured by a specific and sensitive radioenzymatic assay in seven male extrinsic asthmatic and six age-matched non-atopic non-asthmatic male subjects during exercise and voluntary isocapnic hyperventilation. 2. There was no change in peak expiratory flow in normal subjects with exercise or hyperventilation, but asthmatic subjects showed a 29.4 +/- SEM 5.8% fall a...
متن کاملRunning, walking, and hyperventilation causing asthma in children.
To examine further the relation between type of exercise, workload, ventilation, and exercise-induced asthma, we compared treadmill walking with treadmill running and treadmill running with isocapnic hyperventilation in separate studies in children and adolescents. Inspired air conditions were identical during each pair of tests. Walking and running with similar minute ventilation and oxygen co...
متن کاملPseudo-asthma: when cough, wheezing, and dyspnea are not asthma.
Although asthma is the most common cause of cough, wheeze, and dyspnea in children and adults, asthma is often attributed inappropriately to symptoms from other causes. Cough that is misdiagnosed as asthma can occur with pertussis, cystic fibrosis, primary ciliary dyskinesia, airway abnormalities such as tracheomalacia and bronchomalacia, chronic purulent or suppurative bronchitis in young chil...
متن کاملRefractory period following induced asthma: contributions of exercise and isocapnic hyperventilation.
To compare the refractory period that follows exercise and isocapnic hyperventilation, 10 asthmatic children performed two pairs of challenge tests in random order at least six hours apart. In pair A a hyperventilation challenge was followed by an exercise challenge and in pair B the order was reversed. Both pairs of tests were done while the children were breathing cold dry air. Tests were mat...
متن کاملAn unusual example of exercise-induced asthma.
A patient with exercise-induced asthma is described in whom the post-exercise fall in F.E.V.1 was not prevented by the inhalation of isoprenaline immediately before exercise but was almost completely prevented by subcutaneous atropine given 40 minutes before exercise. A large fall in F.E.V.1 similar to the fall after exercise occurred after carbon dioxide-induced hyperventilation and voluntary ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Thorax
دوره 36 8 شماره
صفحات -
تاریخ انتشار 1981