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34 Cards in this Set
- Front
- Back
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functions of anesthesia machine
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-receive gas from central supply or cylinders
-controls flow of gases and reduces their pressures -measures gases and loads them with anesthetic vapors -provides gas to patient for breathing -MONITORING |
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function of pressure regulators and pressures
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-reduces high and variable pressures in cylinders to intermediate pressure (4psi)
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gas cylinder volumes and pressures
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O2=2200psi, 625 L
NO2=745psi, 1590 L AIR=2000psi, 625 L |
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medical gas states and colors
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O2=green, gas
NO2=blue, gas/liquid AIR= Yellow. gas |
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calculating inspired O2 conc. FiO2
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FiO2= O2(L/min) + Air (L/Min)/Total gas flow
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list inhalation anesthetic properties
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DES= least potent
ISO=most potent all are slow on, slow off |
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what effects vapor pressure
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temperature
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components of circle system and their functions
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Fresh gas inlet
Unidirectional valves Inspiratory Limb Y-Piece Expiratory Limb Gas Reservoir bag APL valve CO2 Absorber |
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basic ventilation modes
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Spontaneous
Assisted Controlled |
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VCV v. PCV
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VCV= tidal volume is preset
PCV= peak airway pressure is set |
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positive pressure ventilation
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you give pressure to them, breath for them, close APL valve.
APL valve is open when they are breathing spontaneously |
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Function of vaporizer
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changes liquid anesthetic to vapor and adds a controlled amount to fresh gas flow
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ISO
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Vapor pressure= 240
MAC= 1.2% PURPLE |
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SEVO
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Vapor pressure= 160
MAC= 2.0% YELLOW |
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DES
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Vapor pressure= 681
MAC=6% BLUE |
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Advantages of Circle System
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heat and moisture conservation
ability to use low fresh gas flows ability to scavenge waste gases |
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Disadvantages of Circle System
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complex design
numerous connections large, bulky design w/ limited portability |
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Fresh Gas Inlet
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where anesthetic agents enter circuit
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Unidirectional Valves
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Keep gas flowing in 1 direction
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Inspiratory Limb
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connects machine to patient
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Y-piece
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elbow, connects circuit to patient
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Expiratory Limb
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connects patient to machine
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gas reservoir bag
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provides a place for gas to accumulate
-patients breath is stored here |
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APL Valve
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provides a variable threshold for venting
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CO2 Absorber
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removes CO2 to prevent rebreathing
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Spontaneous breathing
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free breathing, APL= 0
02=high no assistance |
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assisted breathing
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w/ bag, but at the end of the case
-augmentation of tidal volume with patient making some respiratory effort |
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controlled breathing
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total control of respiration with patient making no respiratory effort
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Volume Control Ventilation
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Tidal Volume is preset and the resultant airway pressure is a function of lung compliance and other factors
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Controlled Ventilation Modes
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peak airway pressure is preset and the delivered tidal volume is a product of lung compliance and other factors
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Tidal volume
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10-15ml/kg for adults
-Lower to increase CO2 |
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Respiratory rate
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10 initial setting
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Minute Ventilation
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Vt X RR
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I:E Ratio
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How much of each ventilation cycle is devoted to inspiration and expiration
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