Exercise-induced shortness of breath not always caused...( hma in 98 of these patients only 11 pa...),Health

hma in 98 of these patients, only 11 patients were shown to have asthma as the cause of their exercise-induced symptoms. For the majority of the other patients, not only did the testing definitively demonstrate the absence of asthma, but the sophisticated respiratory and heart measurements also revealed the true cause of the shortness of breath during exercise. The findings are published in the March issue of Annals of Allergy, Asthma and Immunology. In the study, the most common cause of exercise-induced dyspnea was simply that the patients had reached their natural limits for exercising, and their shortness of breath was an entirely normal response to vigorous exercise. Despite the varying levels of cardiovascular conditioning for the 74 patients in this group, each patient had interpreted their normal physiologic shortness of breath as being abnormal.

"Being kids, they thought they should be able to do anything they want without limits," Weinberger said. "We were able to reassure the patients and parents that there was no abnormality and advise the type of cardiovascular conditioning or athletic training that would enable them to be physically active without the natural anxiety that occurs with dyspnea."

For the other patients, the testing revealed several different physical causes of the EID. Fifteen patients had mild physical conditions that caused inefficient, abnormal breathing patterns - they breathed too fast and too shallow to maximize their lung capacity. Weinberger noted that these physical abnormalities, which included minor degrees of scoliosis, were generally not otherwise problematic for the patients and only caused breathing problems during vigorous exercise. Airway problems that hinder breathing during exercise were diagnosed for another 15 patients - 13 had vocal cord dysfunction and two had a condition known as laryngomalacia. One patient had hyperventilation. The most unusual diagnosis was a rare heart abnormality known as
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Contact: Jennifer Brown
jennifer-l-brown@uiowa.edu
319-335-9917
University of Iowa
31-Mar-2005

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