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8 Cards in this Set
- Front
- Back
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Preoxygenation is intended
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to replace nitrogen (denitrogenation) in the patient's functional residual capacity (about 2500 mL of 21 % oxygen) with oxygen. '
In healthy awake patients, the increase in arterial hemoglobin oxygen saturation achieved with eight vital capacity breaths of 100% oxygen over a period of 60 seconds is similar to that achieved by breathing 100% oxygen for 3 minutes at normal tidal volumes. |
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It is common practice to administer an opioid (fentanyl, 1 to 2 } lglkg IV or its equivalent) 1 to 3 minutes before administration of the induction drug.
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fhe opioid is intended to blunt the subsequent pressor and heart rate responses to direct laryngoscopy and tracheal intubation .. and also to initiate preemptive analgesia
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Loss of consciousness typically occurs within about 1 minute when breathing ____________
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8% sevoflurane.
LMA placement can usually be achieved within 2 minutes after administering 7% sevoflurane by facemask. |
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Despite its lack of potency, nitrous oxide is the most frequently adrrurustered inhaled anesthetic. Typically, nitrous oxide (_________ inhaled concentration) is administered in combination with a volatile anesthetic or opioid, or both.
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50% to 70%
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·or example, a full oxygen cylinder (E size) contains psi.
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about 625 L of oxygen at a pressure of 2000 psi and half this volume when the pressure is 1000
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a full nitrous oxide cylinder (E size) contains about
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1590 L, approximately 400 L of nitrous oxide remains when the pressure gauge begins to decrease from its previously constant value of 750 psi
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if unidirectional valves are functioning properly, the only dead space in the circle system is between the
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y-piece and the patient.
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Adjustable Pressure-Limiting Valve
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When the "bag/vent" selector switch is set to "bag," the APL (overflow or "pop-off') valve (l) allows venting of excess gas from the breathing system into the waste gas scavenging system and (2) can be adjusted to allow the anesthesiologist to provide assisted or controlled ventilation of the patient's lungs by manual compression of the gas reservoir bag. The APL valve should be fully open during spontaneous ventilation so that circuit pressure remains negligible throughout inspiration and expiration.
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