Flashcards in Chpt. 13 - Key Points Deck (16):
Name some of the potential health risks presented by anesthesia
- Exposure to WAG
- Exposure to hazardous injectable agents
- Accidents associated with handling of compressed gas cylinders
When and where are WAGs and vapors breathed by all personnel?
- Working in areas in which animals are anesthetized or are recovering from inhalation anesthesia
- Filling or emptying vaporizers
- Cleanup of accidental spills
Name some short term problems related to exposure to WAGs
Long-term WAG exposure
Nervous system dysfunction
!!!Avoid exposure to high levels of WAGs, especially when pregnant!!!
Methoxyflurane and halothane
Considered to be a greater hazard than isoflurane and sevoflurane, as they undergo significant hepatic metabolism and renal excretion whereas iso and sevo are minimally eliminated by these routes.
Volatile WAGs apparently do not ...
... have oncogenic (cancer-causing) effects.
NIOSHs recommendation for WAG concentrations
Limit exposure to 2 parts per million (ppm) or less for halogenated anesthetics (0.5 ppm or less if nitrous oxide is concurrently used).
Why do surveys in veterinary clinics show wide variations in WAG levels?
The levels depend on the sampling site, scavenging system, and anesthetic techniques used.
How to greatly reduce WAG exposure.
Install and use of an effective gas scavenging system
(caution should be used to prevent the scavenger from applying negative pressure to the breathing circuit)
Equipment leak testing should be done on a daily basis to detect and allow correction of leakage from the anesthetic machine and compressed air cylinders.
Tests should be done on both the high-pressure and low-pressure components of the machine.
What anesthetic techniques are associated with excessive release of waste gas?
Use of anesthetic chambers
Use of anesthetic masks
Use of uncuffed ET tubes
What procedure reduces WAG contamination of hospital air?
Turning off the vaporizer before disonnecting the animal from the machine
Filling and emptying the vaporizer
Should be done with care, using appropriate equipment and protective clothing.
WAG levels may be monitored by?
Professional occupational hygienists
By the use of detector badges
Care of compressed air cylinders
They should be transported, used, and stored with care.
Special hazards include risk of fire in areas in which cylinders are stored and the risk of sudden release of pressurized gas from damaged cylinders.