Heat and moisture exchanger as a potential cause of undue resistance to breathing.
D000368:Aged; D000403:Airway Resistance; D005260:Female; D006358:Hot Temperature; D006801:Humans; D006813:Humidity; D011182:Postoperative Care; D012121:Respiration, Artificial / Q000295:instrumentation; D014140:Tracheotomy; D012122:Ventilators, Mechanical / Q000009:adverse effects*