A study of flow-volume curves pre- and post-operatively demonstrated a marked difference between bronchitic and non-bronchitic patients. All bronchitic patients showed lower flow rates at low lung volumes post-operatively, when compared with their pre-operative values. Non-bronchitic patients all had higher flow rates for the same comparison.
References
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CherniackR., CherniackL., and NaimarkA. (1972): Respiration in Health and Disease.W. B. Saunders & Co.Philadelphia, 140.