Page 430 - Clinical Application of Mechanical Ventilation
P. 430
396 Chapter 12
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Figure 12-4 In-line water trap.
HME may not be suitable for certain patients due to problems associated with ad-
If a metered-dose equacy of airflow, humidity, and temperature. Contraindications for HME include
inhaler(MDI) is used in
conjunction with an HME, the a thick and large amount of secretions, minute volume exceeding 10 L/min, body
MDI must be placed between
the HME and patient. temperature less than 32°C, and need for aerosolized medications (Wilkins et al.,
2003). If metered-dose inhalers (MDI) are used in conjunction with an HME, the
MDI must be placed between the HME and patient.
Humidity and Temperature
Since the upper airway is bypassed during mechanical ventilation, the inspired gas
temperature should be kept close to the body temperature. The temperature probe
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Figure 12-5 A photograph and a functional diagram of a heat and moisture exchanger
(HME).
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