23
1. Has a common cold
2. Has tuberculosis or other pulmonary conditions
3. Has been undergoing psychiatric treatment
4. Has multiple sclerosis
References:
Langa, H. (1968) “Relative Analgesia in Dental Practice”
- W.B. Sanders Company
Parbrook, G.D. (1968) “Therapeutic Uses of Nitrous Oxide”
- British Journal of Anesthesia 40K 365
This list does not include all possible contraindications. Therefore, it is the decision and responsibility of
the medical professional to determine whether or not to use nitrous oxide - oxygen sedation for the
patient.
FUNCTIONAL TESTS
NOTE
The failure of any one of the following tests will require the analgesia unit to be returned for service.
These tests must be conducted periodically to insure that your analgesia unit is performing optimally (see
fig 30).
1. Machine Turn-On Test
With gas source activated and mixture dial set at 100%, turn the unit on by rotating the flow
control knob counter-clockwise. The ball located in the oxygen flowmeter tube should start to
move up the tube within one (360) rotation of the flow control valve.
2. 100% Oxygen Test
Adjust mixture dial to 100% oxygen position and rotate flow control valve until 10 LPM is
indicated on oxygen flowmeter tube. Observe nitrous oxide tube and ball. The ball may show
some indication of motion but the top of the ball must remain below the 1 LPM mark on the tube.
FUNCTIONAL TESTS (cont.)
3. Total Flow Test
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