Marihuana and Exercise Testing

To the Editor: Provocative exercise testing in persons suspected of having mild asthma is diagnostically useful.¹ Although most physicians screen patients by careful questioning about the use of agents (e.g., methylxanthines or adrenergic agents) that may alter the response to exercise in those who may have asthma, surprises do occur. We performed an exercise stress test in a 13-year-old boy with asthma and found virtually no decrease in pulmonary function after a submaximal effort on a cycloergometer. One week earlier, the boy had showed marked bronchoconstriction after an identical stress test. During further questioning, the subject admitted that he had. No extract is available for articles shorter than 400 words.