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However, both produce tar and other chemicals that can irritate the lungs

94375 Respiratory flow volume loop 94617 Exercise test for bronchospasm, including pre- and post- spirometry, electrocardiographic recording(s), and pulse oximetry 94618 Pulmonary stress testing (eg, 6-minute walk test), including measurement of heart rate, oximetry, and oxygen titration, when performed 94621 Cardiopulmonary exercise testing, including measurements of minute ventilation, CO2 production, CO2 uptake, and electrocardiographic recordings 94726 Plethysmography for determination of lung volumes and when performed, airway resistance

PMID: 9288094 5 McDermott MF, Aksentijevich I, Galon J, et al

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Published July 16, 2020