An Exploratory Study on the Efficacy of a New Heat and Moisture Exchanger (Provox® LifeTM) for Laryngectomized Patients.

Although the statistical analyses did not reach significance, there was a decreasing trend in the number of coughs during sleep, number of (forced) expectorations of sputum, number of occurrences of colored sputum, and frequency of cleaning the permanent tracheostomy (Figure 3 ).

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