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Study guide 56 Chapter Humidity and Bland Aerosol Therapy What is the point in the respiratory track where inspired gas reaches body temperature ambient pressure saturated BTPS conditions a point of thermal equilibrium b hygroscopic saturation boundary c

Chapter Humidity and Bland Aerosol Therapy What is the point in the respiratory track where inspired gas reaches body temperature ambient pressure saturated BTPS conditions a point of thermal equilibrium b hygroscopic saturation boundary c thermal inversion boundary d isothermic saturation boundary As inspired gas moves into the lungs it achieves BTPS conditions body temperature C barometric pressure saturated with water vapor relative humidity at C This point normally approximately cm below the carina is called the isothermic saturation boundary Which of the following is FALSE about the isothermic saturation boundary ISB a Below the ISB temperature and relative humidity remain constant b Above the ISB temperature and humidity increase during exhalation c The ISB is normally located just below the larynx vocal cords d Above the ISB temperature and humidity decrease during inspiration This point normally approximately cm below the carina is called the isothermic saturation boundary ISB Above the ISB temperature and humidity decrease during inspiration and increase during exhalation Which of the following factors cause the isothermic saturation boundary ISB to shift farther down into the airways decreased ambient temperature increased tidal volume VT endotracheal intubation a and b and Cc and d and The ISB shifts distally when a person breathes through the mouth rather than the nose when he or she breathes cold dry air when the upper airway is bypassed breathing through an arti ?cial tracheal airway or when the minute ventilation is higher than normal What is the primary goal of humidity therapy a decrease airway reactivity to cold b maintain normal physiologic conditions c deliver drugs to the airway d reduce upper airway in ammation The primary goal of humidi ?cation is to maintain normal physiological conditions in the lower airways Indications for warming inspired gases include all of the following except a treating a patient whose airways are reactive to cold b providing humidi ?cation when the upper airway is bypassed c treating a patient with a low body temperature hypothermia d reducing upper airway in ammation or swelling Administration of dry gases at ows exceeding L min can cause which of the following structural damage heat loss water loss a and b and c and d and Administration of dry medical gases at ows greater than L min to the upper airway causes Cimmediate heat and water loss and if prolonged causes structural damage to the epithelium Inhalation of dry gases can do which of the following increase viscosity of secretions impair mucociliary motility increase airway irritability a and b c and d and As the airway is exposed to relatively cold dry air ciliary motility is reduced airways become more irritable mucous production increases and pulmonary secretions become inspissated thickened due to dehydration Clinical indications for delivering cool humidi ?ed gas include which of the following post- extubation edema upper airway in ammation croup laryngotracheal bronchitis epiglottitis a and b and c and d and The delivery of cool humidi ?ed gas is used to treat upper airway in