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Assessment of tracheal temperature and humidity in laryngectomized individuals and the influence of a heat and moisture exchanger on tracheal climate
Author(s) -
Zuur J. Karel,
Muller Saar H.,
Vincent Andrew,
Sinaasappel Michiel,
de Jongh Frans H. C.,
Hilgers Frans J. M.
Publication year - 2008
Publication title -
head and neck
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.012
H-Index - 127
eISSN - 1097-0347
pISSN - 1043-3074
DOI - 10.1002/hed.20835
Subject(s) - humidity , relative humidity , moisture , heat exchanger , materials science , medicine , airway , zoology , atmospheric sciences , environmental science , meteorology , composite material , anesthesia , thermodynamics , geography , biology , physics , geology
Background The beneficial function of heat and moisture exchangers (HMEs) is undisputed, but knowledge of their effects on intra‐airway temperature and humidity is scarce. The aim of this study was to evaluate the clinical applicability of a new airway climate explorer (ACE) and to assess the HME's influence on tracheal climate. Methods Intratracheal temperature and humidity were measured with and without HME in 10 laryngectomized patients. Results An HME causes the intratracheal mean humidity minima to increase with 3.2 mg H 2 O/L (95% CI: 1.5–4.8 mg H 2 O/L; p <.001), from 21.4 to 24.6 mg H 2 O/L, and the mean temperature minima to decrease with 1.6°C (95% CI: 0.9–2.4°C; p <.001) from 28.5°C to 26.9°C. Relative humidity values suggest that the tested HME keeps inspired air (nearly) fully saturated during the full course of inspiration. Conclusion Assessment of intratracheal temperature and humidity, and evaluation of HME effectiveness is feasible with the ACE. The tested HME significantly increases the intratracheal humidity, but decreases the intratracheal temperature. Relative humidity calculations suggest that increasing the thermal capacity of this rehabilitation device can further increase the heat and moisture exchange efficiency. © 2008 Wiley Periodicals, Inc. Head Neck, 2008