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Changes in pCO 2 , Symptoms, and Lung Function of Asthma Patients During Capnometry-assisted Breathing Training

Changes in pCO 2 , Symptoms, and Lung Function of Asthma Patients During Capnometry-assisted Breathing Training In a recent pilot study with asthma patients we demonstrated beneficial outcomes of a breathing training using capnometry biofeedback and paced breathing assistance to increase pCO 2 levels and reduce hyperventilation. Here we explored the time course changes in pCO 2 , respiration rate, symptoms and lung function across treatment weeks, in order to determine how long training needs to continue. We analyzed in eight asthma patients whether gains in pCO 2 and reductions in respiration rate achieved in home exercises with paced breathing tapes followed a linear trend across the 4-week treatment period. We also explored the extent to which gains at home were manifest in weekly training sessions in the clinic, in terms of improvement in symptoms and spirometric lung function. The increases in pCO 2 and respiration rate were linear across treatment weeks for home exercises. Similar increases were seen for in-session measurements, together with gradual decreases in symptoms from week to week. Basal lung function remained stable throughout treatment. With our current protocol of paced breathing and capnometry-assisted biofeedback at least 4 weeks are needed to achieve a normalization of pCO 2 levels and reduction in symptoms in asthma patients. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Applied Psychophysiology and Biofeedback Springer Journals

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