CDS831 Final Exam with Questions and 100% Correct Answers
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CDS831
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 sme...
CDS831 Final Exam with Questions
and 100% Correct Answers
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
,3 characteristics of N2O that make it useful in dentistry: - Answer 1. analgesic properties
2. anxiolytic properties
3. amnestic properties
True or False: Nitrous oxide is a nonflammable gas - Answer True
*however, mixtures of N2O and O2 (such as those used for anesthesia
administration) are flammable
The blood-gas partition coefficient for N2O is ____ - Answer 0.47
What does the blood-gas partition of N2O tell us about its ability to cross
alveolar membranes? - Answer it crosses easily and quickly
True or False: Once absorbed by the body, N2O is metabolized into its counterparts -
Answer False
it does not break down at all, this is why it has to be "flushed out"
Peak clinical effects of N2O are usually seen in ___-___ minutes - Answer 3-5 mins
True or False: N2O is stored in the body tissues for 10-15 minutes - Answer False
*it is not stored in body tissues at all, this is why elimination is rapid
, _____________ is defined as the amount of drug necessary to prevent movement in
50% of subjects responding to surgical incision - Answer minimum
alveolar concentration
The minimum alveolar concentration (MAC) of N2O is ____% - Answer 104%
True or False: N2O cannot provide profound anesthesia alone and must be used
in combination with local anesthesia - Answer True
In a classic continuous flow sedation unit, the gas tanks and reservoir bag will
be attached via a ______ assembly - Answer Yoke
In a classic continuous flow sedation unit, the N2O tank will be what color? What
about the O2 tank? - Answer N2O = blue
O2 = green
In a classic continuous flow sedation unit, a _________ safety system will prevent
mistaken use of the wrong gas - Answer pin index
True or False: there are no cardiovascular contraindications for the use of N2O - Answer
True
*can even be used for tx of MI to increase O2 flow
True or False: patients with asthma should not be treated with N2O - Answer False
*asthma is NOT a contraindication for N2O
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