Pursed-lip breathing is believed to increase positive pressure generated within the airways and to buttress or stent the small bronchioles, thereby preventing premature airway collapse. This stenting of the airways, which should promote effective expiration, potentially results in a reduced functional residual capacity. This breathing pattern significantly decreases the respiratory rate and increases the tidal volume, resulting in improved alveolar ventilation (measured by arterial partial pressure of carbon dioxide [Po2]) and enhanced ventilation of previously underventilated areas.39 Although these results may not be universal, pursed-lip breathing appears to reduce respiratory rate and increase tidal volume, thereby maintaining minute ventilation. Pursed-lip breathing is more cost effective from an energy standpoint and may reduce the work of breathing for select patients.39 It should be performed without significant active effort on the part of the patient.

Source: www.sciencedirect.com/topics/medicine-and-dentistry/pursed-lip-breathing

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