THE SIGNIFICANCE OF THE REFLEX BRONCHOCONSTRICTION PROVOKED BY GASTROESOPHAGEAL REFLUX IN BRONCHIAL-ASTHMA

  • 1 January 1985
    • journal article
    • research article
    • Vol. 66  (2) , 91-97
Abstract
To demonstrate the existence and assess the magnitude of reflex bronchoconstriction in asthmatics, triggered by gastroesophageal reflux, pulmonary function studies (forced expiratory spirogram, flow-volume loops and airway resistance) were performed during a Bernstein test in 21 adult patients with intrinsic asthma and in 15 controls. Six asthmatics and 7 controls had symptomatic reflux test and a positive standard acid reflux test. Bernstein test was positive in all symptomatic individuals and in 2 asthmatics with a negative standard acid reflux test. Changes in pulmonary function occur only in asthmatics with symptomatic reflux. Decreases were: FEV1 [forced expiratory volume in 1 s] 8.4 .+-. 3.4; FEF25-75% [mid-force flow-rate] 45 .+-. 7.3; .ovrhdot.Vmax 15 .+-. 8.4; and Sgaw [specific conductance] 16 .+-. 3.7. Although changes were statistically significant (P < 0.05), the magnitude of decrease is rather small and unlikely to be felt by an asthmatic or produce wheezy dyspnea. Therefore, even though the presence of acid in the lower esophagus may produce reflex bronchoconstriction in some asthmatics with symptomatic reflux, this appears to be of little significance.