CDS831 Final Exam with Questions and 100% Correct Answers
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CDS 831
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CDS 831
6 non-respiratory contraindications for the use of N2O: - Answer 1. cranial base
fractures
2. bowel obstructions
3. mind altering conditions
4. recent ear infection/surgery
5. recent eye surgery
6. pregnancy (esp 1st trimester)
CDS831 Final Exam with Questions and 100%
Correct Answers
6 non-respiratory contraindications for the use of N2O: - Answer 1. cranial base
fractures
2. bowel obstructions
3. mind altering conditions
4. recent ear infection/surgery
5. recent eye surgery
6. pregnancy (esp 1st trimester)
5 symptoms of N2O treatment (aside from analgesia, anxiolysis, and amnesia): - Answer
1. heaviness/lightness
2. tingling in the fingers or toes
3. subjective hearing changes
4. voice resonance changes
5. warm/flushed feeling
_________ is defined as the method of administering a drug in incremental amounts
until a desired endpoint is met - Answer titration
True or False: there is no standard titration for N2O - Answer True
*individuals may even react differently to the same amount of N2O on a different
occasion
At the end of a procedure, 100% oxygen should be used for ___-___ minutes to ensure
full reversal before discharge - Answer 5-10 mins
,5 signs to look for when determining the appropriate level of sedation: - Answer 1.
psychological signs
2. body movement
3. eyes
4. facial expression
5. awareness
What types of psychological signs are typically seen with N2O? (2) - Answer mood
changes
happy, relaxed, comfortable
"laughing gas"
What types of body movements are typically seen with N2O? (4) - Answer 1. less body
tension
2. no white knuckles
3. relaxed shoulders
4. deeper respirations
What type of eye changes are typically seen with N2O? (4) - Answer 1. decreased
activity
2. less focus
3. slower blink rate
4. closed eyes
What type of facial expressions are typically seen with N2O? (4) - Answer 1. content
,2. smiling/laughing
3. flat, not alert
4. forehead creases
How aware do you expect a patient undergoing N2O to be? - Answer fully aware
can hold a conversation and maintain all protective reflexes
6 signs of oversedation: - Answer 1. increasing discomfort
2. increasing anxiety
3. fixed stare with sluggish eyelids
4. vision changes
5. slurred speech
6. nausea
True or False: a patient who is fully recovered from N2O use will still need an escort and
should not drive - Answer False
*although mental and psychomotor impairment does occur with N2O use, these affects
will wear off with full recovery
Prolonged/chronic use of N2O has been linked to inactivation of ___________, which
causes a disruption in Vitamin ____ metabolism - Answer methionine synthase, B12
Neurologic disorders associated with chronic N2O use appear as ______________ -
Answer myeloneuropathies
, __________ systems are used to protect those who work around N2O by removing
trace N2O before, during, and after use by the patient - Answer scavenging
3 ways trace N2O can escape before, during, or after treatment: - Answer 1. patient
speaking
2. patient moving
3. ill-fitting mask
In a dental office, the primary scavenging system is __________ at an optimal rate of
____ L/min - Answer suction, 45 L/min
Risk of developing a Vitamin B12 deficiency following N2O use is greatest in what types
of patients? (3) - Answer 1. pregnant women
2. those with impaired wound healing
3. those with preexisting vitamin B12 deficiencies
Physical properities of N2O (7) - Answer Stable, linear compound
Sweet smelling, colorless
Boiling point 88.5
Becomes a liquid when compressed into a cylinder
It is an oxidizing gas, so no hydrocarbon compounds, such as lubricants, grease, or oil
Nonflammable, but can support combusion
Mixture of N2O and O2 is flammable
Is N2O soluble or insoluble - Answer relatively insoluble
What is the blood-gas partition coefficient - Answer 0.47
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