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HUMIDITY THERAPY

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Humidity is water in its vapor form, and is invisible, referred to as 'molecular ... Normally inspired air is warmed to nearly body temp. ... – PowerPoint PPT presentation

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Title: HUMIDITY THERAPY


1
HUMIDITY THERAPY
2
INTRODUCTION
  • Humidity is water in its vapor form, and is
    invisible, referred to as molecular water
  • Absolute humidity is the actual amount of water
    in a gas, expressed in mg/L
  • Relative humidity is a ratio of actual water
    vapor present in a gas to the capacity it can
    hold at a given temp. (expressed in )

3
Humidity (contd)
  • Saturated gas is when th content of humidity
    present is equal to the capacity it can hold at a
    given temp. (100 R.H.)
  • Dewpoint is the temp. at which water vapor
    condenses to a liquid
  • Saturated air at body temp.(37C) contains 43.9
    mg/L and has a vapor pressure of 47 mmHg

4
Humidity (contd)
  • Humidity deficit exists when inspired gas
    contains lt43.9 mg/L (vapor press.lt47mmHg) and the
    mucosa has to expend water to bring the gas to
    full humidification
  • Humidity of pathological degree can be produced
    by - breathing dry gas - mucosal
    crusting

5
Clinical Humidity Therapy
  • Clinical uses for molecular water (humidity) can
    be divided into two broad classes
  • 1-- To humidify dry, therapeutic gases to make
    them more comfortable to breathe
  • 2-- To provide near body humidity levels of
    inspired gases for patients with artificial
    airways

6
Humidifying Therapeutic Gases
  • Goal is to provide at least a level of humidity
    equal to or exceeding that in room air (hospitals
    have 30-70 R.H.)
  • Do not add water to the airway, but prevents
    these gases from adding to the normal humidity
    deficit

7
Providing Body Humidity
  • Normally inspired air is warmed to nearly body
    temp. and is saturated with water vapor when it
    reaches the carina
  • If upper airway is bypassed with an artificial
    airway, heated humidification system is used
  • Heated humidifiers can provide saturated gas at
    or near body temp.
  • H. H. do not add H2O to airway

8
Manifestations of Humidity Deficit
  • Reduced ciliary action leading to dry, hacking,
    NPC
  • Inspissated secretions lead to increased airflow
    resist., increased level of infection, and
    atelectasis
  • Earache d/t pressure on the eardrum
  • Substernal pain d/t inflammation of airway tissue
    from contact with dry gas
  • Sore throat d/t exposure to dry gas

9
Manifest. of H.D.
  • Dryness of skin leading to decreased skin turgor
  • Unstable control of body fluids - normally
    takes 250 - 300 ml to humidify inspire
    air - pulmonary patient may lose 1000 - 2000
    ml leading to fluid imbalance and electrolyte
    imbalance

10
Conditions Requiring Humidification
  • Administration of medical gases from a cylinder
    or pipeline
  • Environmental R.H. lt 40 in a patient without
    lung disease
  • Environ. R.H. lt 70 in a patient with lung
    disease
  • Patient with known secretions or a disease that
    causes secretions
  • Anatomical humidifier is bypassed

11
Contraindications for Humidity
  • Situations leading to secretions swelling and
    blocking airway
  • Situations where the patients body temp. may
    increase to undesirable levels

12
Factors Relating to the Efficiency of any
Humidifier
  • Surface area exposure between the water and the
    gas to be humidified
  • Time the gas and H2O are in contact
  • Temperature of both the water and the gas
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