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Anesth Machines 1

Clinical - Supply & disposal

The current anesthesia gas machine standard is: ASTM F1850 (American Standard for Testing & Materials)
SPDD stands for: Supply, processing, delivery, disposal
Supply: fresh gases get to the anesthesia machine by _____ and _____ pipeline, cylinders
Supply: power gets to the anesthesia machine by _____ and _____ electricity, battery backup
Processing: 6 ways the machine prepares gases before delivery to the patient are: valves, flowmeters, oxygen flush, low pressure alarms, vaporizers, common gas outlet
Delivery: 3 ways that delivered gases are controlled & monitored: breathing circuits, ventilators, integral monitors
How are waste gases disposed? scavenge systems
Cylinder pressure = ____ pressure system Pipeline pressure = ____ pressure system cylinder = high pressure system pipeline = intermediate pressure system
Low pressure system includes: flowmeter tubes, vaporizers, check valves, common gas outlet
Cylinder pressure is measured by: Bourdon gauges
What type of regulator is on a cylinder? What type of regulator is on a pipeline? Cylinder = 1st stage regulator Pipeline = oxygen 2nd stage regulator
1st stage regulator drops cylinder pressure to: 40 - 48 psi (intermediate pressure)
The volume of oxygen & air in E cylinder is: 625 - 700 L
The volume of nitrous oxide in E cylinder is: 1590 L
Service pressure (PSI) of oxygen & air is: 1900
Service pressure (PSI) of nitrous oxide is: 745
What safety system is on cylinders? How is the safety disabled? PISS (pin index safety system). Disabled if pins are missing or if more than 1 washer is used
Valve stem on cylinder is fragile & contains one or more of the 3 safety features: frangible disc (bursts w/ high pressure to release cylinder contents); safety relief (opens w/ high pressure to release cylinder content); fusible plug (alloy melts at 200 degrees F to release cylinder contents)
Service pressure is: the pressure in the cylinder
For cylinder supply the hanger yoke does 3 things, which are: orients the cylinder, gas tight seal, ensures unidirectional flow
Which gas law pertains to volume & pressure? Boyle's Law
Minimum of 1 E cylinder of O2 is: 1000 psi (about 1/2 tank)
What is the formula to calculate oxygen cylinder supply duration? O2 volume (L) = capacity in L * gauge pressure (psi) divided by service pressure (psi). Divide this answer by O2 flow rate
What is the formula to estimate oxygen cylinder supply duration? Time remaining (hrs) = PSIG divided by (200 * flow rate)
Nitrous oxide is manufactured by heating _________ ammonium nitrate
Nitrous oxide has a service pressure of ____ until ___% of the tank is used 745 psi, 75%
The only reliable way to determine the remaining volume of nitrous oxide is to: weigh the tank
The energy consumed in conversion of liquid to gas is called: latent heat of vaporization
Pipeline pressure is _____ psi & _______ (low, intermediate, or high) pressure 45 - 55 psi, plus or minus 5; intermediate pressure
______ prevents pipeline supply from going to the O2 tank instead of to the patient (prevent retrograde flow) one way check valve
Pipeline pressure is monitored by ______ bourdon gauge
With pipeline supply what is the safety mechanism for low pipeline oxygen pressure? Fail-safe valve stops delivery of all other gases to prevent hypoxic gas delivery
If there is a loss of pipeline oxygen pressure the 3 things that are to be done are: open E cylinder fully, disconnect pipeline O2 supply, consider low fresh gas flows & manual ventilation (b/c bellows are driven by O2 pressure)
What is the function of the scavenging system? collects anesthetic waste gases from the breathing circuit & ventilator & remove it from the operating room
Per OSHA standards the exposure to halogenated agents is less than ____; halogentated agents w/ nitrous is less than ___; nitrous oxide is less than _____ halogenated: 2 ppm halogenated agents w/ N2O: 0.5 ppm N2O: 25 ppm
Room ventilation requires a minimum of ___ air exchanges per hour w/ at least ___ fresh/outdoor air exchanges per hour 15 air exchanges; 3 fresh/outdoor air exchanges
5 ways to limit waste gas exposure are: use low fresh gas flows, check machine for leaks, disconnect N2O at wall outlet at end of day, use TIVA, or avoid use of nitrous oxide
The 2 types of disposal interfaces are _____, which includes ___ & _____; and _____, which includes ____ Closed interface includes active & passive scavenge. Open interface includes active scavenge
Closed interface communicates with ________ & _____ (does / does not) hiss communicates w/ atmosphere only through valves; does not hiss
Open interface communicates with ________ & _____ (does / does not) hiss communicates directly with atmosphere; does hiss
In the closed interface system, what is the difference between passive & active scavenge? Passive: needs positive pressure relief valve Active: vacuum. Has positive & negative pressure relief valves
Improper use of the open interface = OR contamination
_____ & _____ systems rely on proper vacuum control Active closed interface & open interface scavenge systems
Hissing with closed interface means: positive pressure relief valve is releasing waste gases into the operating room
Hissing with open interface means: proper operation & waste gas scavenge
Created by: Thommy413