Humidification - DMSeminar HumidificationinICU DrAjmal Khan...

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DM Seminar Humidification in ICU Dr Ajmal Khan
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troduction Introduction Water all three states of matter within a relatively small temperature range Energy is applied to liquid water water vapor mount of water vapor present in a gas is commonly Amount of water vapor present in a gas is commonly referred to as humidity easured & expressed in terms of Measured & expressed in terms of Absolute humidity elative humidity Relative humidity
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troduction Introduction Absolute humidity Amount of water vapor present in a gas mixture Directly proportional to gas temperature At the alveolar level Gas is 37° C 100% relative humidity Contains 43.9 mg H 2 O/L
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troduction Introduction Relative Humidity as mixture is saturated if it contains the maximum Gas mixture is saturated if it contains the maximum possible amount of water vapor it is capable of holding at t tt that temperature Amount of humidity in a gas that is less than saturated is relative humidity elative humidity (%) = (Absolute Humidity) aximum Capacity) X 100 Relative humidity (%) (Absolute Humidity) / (Maximum Capacity) X 100
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troduction Introduction The relative humidity of a gas saturated with water por at any temperature is 100% vapor at any temperature is 100% The temperature at which a gas is 100% saturated is known as the dew point
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irway humidification Airway humidification Function of URT – humidification & filtration Inspiration – water from airway to inspired gas Humidification continues until full saturation piration Expiration Convection–heat from alveolar air to airway ooling of air reduces capacity to hold vapor so that Cooling of air reduces capacity to hold vapor so that condensation occurs eleases latent heat of vaporization Releases latent heat of vaporization Rewarms & rehydrates airway mucosa
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irway humidification Airway humidification Mucociliary elevator Comprised of cilia & associated fluid Airway lined with film of liquid ~ 10 μm atery eri liary ol) & viscid (gel) layer Watery peri ciliary (sol) & viscid (gel) layer Cilium bathed in fluid layer & allows it move freely within it Fluid layer –moisture for humidification Claws of the cilium extends through fluid layer contacting viscid layer & propel it cephalad
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irway humidification Airway humidification Mucociliary clearance iscosity gradient Viscosity gradient Evaporation of water from mucus – viscocity increases from sol to gel Large water losses – inhibits movement of cilia Generate encrustation of mucus obstructing airway or rahceal be ta cea tube Irreversible damage to airway epithelium
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irway humidification othermic saturation boundary ases reach alveolar Airway humidification Isothermic saturation boundary Gases reach alveolar conditions (37°C & 100% relative humidity) Above ISB Countercurrent heat & moisture exchanger Below ISB Temperature & water content remain constant tubation
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Humidification - DMSeminar HumidificationinICU DrAjmal Khan...

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