A Review on Cough Augmentation Techniques: Assisted Inspiration, Assisted Expiration and Their Combination

Author:

Spinou A.1

Affiliation:

1. Population Health Sciences, Faculty of Life Sciences and Medicine, King’s College London, United Kingdom. arietta.spinou@kcl.ac.uk

Abstract

Cough is an important mechanism of airway clearance. In patients who present weak and ineffective cough, augmentation techniques aim to assist or simulate the maneuver. These techniques target different phases of the cough cycle, mainly the inspiratory and expiratory phases, through assisted inspiration, assisted expiration and their combination. They include the manual hyperinflation, ventilator hyperinflation, glossopharyngeal breathing, manually assisted cough and mechanical insufflator-exsufflator, each applied individually or in different combinations. The aim of this review is to investigate the effectiveness and safety of cough augmentation techniques. Findings support that all commonly used techniques can theoretically improve airway clearance, as they generate higher cough peak flows compared to unassisted cough. Still, the studies assessing cough augmentation present considerable limitations and the direct comparison of different techniques is challenging. Current evidence indicate that cough peak flow shows higher increase with the combination of assisted inspiration and expiration, and improvement is greater in patients with lower unassisted values. Associated adverse events are infrequent.

Publisher

Institute of Physiology of the Czech Academy of Sciences

Subject

General Medicine,Physiology

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