DAANCE Levels of Sedation 2 — Questions and Answers
Question 1: According to the ASA continuum, which level of sedation is characterized by loss of consciousness with inability to be aroused even by painful stimulation?
- Minimal sedation
- Moderate sedation/analgesia
- Deep sedation
- General anesthesia (Correct answer)
Correct answer: General anesthesia
General anesthesia is defined by unarousability, loss of protective airway reflexes, and requirement for airway support.
The ASA sedation continuum: Minimal, Moderate, Deep, General Anesthesia. General anesthesia involves unarousable unconsciousness, potential loss of airway patency and protective reflexes, and impaired cardiovascular function. DAANCE certification prepares assistants working in offices providing moderate sedation.
Question 2: A patient under moderate sedation (conscious sedation) should be able to:
- Respond only to maximal stimulation such as a sternal rub
- Maintain spontaneous ventilation and respond purposefully to verbal commands (Correct answer)
- Tolerate endotracheal intubation without awareness
- Require mechanical ventilation to maintain adequate oxygenation
Correct answer: Maintain spontaneous ventilation and respond purposefully to verbal commands
The defining features of moderate sedation are purposeful response to verbal or light tactile stimulation and maintenance of spontaneous ventilation.
Moderate sedation preserves protective reflexes, patent airway, and spontaneous ventilation. The patient responds purposefully (not reflexively) to verbal commands. Inadvertent progression toward deep sedation requires immediate dose reduction and enhanced monitoring.
Question 3: Which factor most commonly causes unintended deepening of sedation beyond the intended level?
- Under-dosing of the local anesthetic
- Synergistic drug interactions when combining opioids and benzodiazepines (Correct answer)
- Failure to take a blood pressure reading during the procedure
- Excessive chair tilt into Trendelenburg position
Correct answer: Synergistic drug interactions when combining opioids and benzodiazepines
Combining opioids and benzodiazepines produces synergistic CNS and respiratory depression, significantly increasing the risk of deeper-than-intended sedation.
The combination of an opioid (e.g., fentanyl) with a benzodiazepine (e.g., midazolam) produces CNS depression far greater than either drug alone. This synergy lowers the dose needed for sedation but also narrows the therapeutic window. Titration must be slower and monitoring more vigilant when using polypharmacy sedation regimens.
Question 4: The purpose of pre-sedation fasting (NPO) guidelines before IV sedation is to:
- Prevent hypoglycemia during the procedure
- Reduce gastric volume and acidity, lowering aspiration risk during sedation (Correct answer)
- Ensure the patient is calm and not nauseous before drug administration
- Allow the liver to metabolize previous medications before new sedatives are given
Correct answer: Reduce gastric volume and acidity, lowering aspiration risk during sedation
NPO guidelines reduce the risk of pulmonary aspiration by lowering gastric volume. The ASA recommends fasting from solids for 6 hours and clear liquids for 2 hours before sedation.
Gastric aspiration of acidic contents can cause chemical pneumonitis and is a potentially fatal complication of sedation. ASA NPO guidelines: 2 hours for clear liquids, 4 hours for breast milk, 6 hours for light meals, 8 hours for fried or fatty foods. Documentation of NPO compliance is a medicolegal requirement.
Question 5: During moderate IV sedation, which monitoring parameter is MANDATORY throughout the procedure?
- Bispectral index (BIS) monitoring
- Continuous pulse oximetry and blood pressure at regular intervals (Correct answer)
- End-tidal CO2 monitoring via mainstream capnography
- Electroencephalogram (EEG) monitoring
Correct answer: Continuous pulse oximetry and blood pressure at regular intervals
Continuous pulse oximetry and regular blood pressure monitoring are the minimum mandatory requirements for moderate sedation.
Standard monitoring for moderate sedation includes: continuous pulse oximetry, continuous ECG, non-invasive blood pressure at least every 5 minutes, respiratory rate, and level of consciousness. Capnography is increasingly required by state boards and ADSA standards.
Question 6: When should the anesthesia record (sedation chart) be completed?
- Within 24 hours of the procedure
- Contemporaneously during the procedure, recording vitals at least every 5 minutes (Correct answer)
- Only when a complication occurs
- At the beginning of the next visit
Correct answer: Contemporaneously during the procedure, recording vitals at least every 5 minutes
Vital signs must be recorded in real time during sedation at minimum every 5 minutes. The anesthesia record is a legal document and must be accurate and contemporaneous.
The anesthesia record documents: patient identity, ASA status, pre-op vitals, all drugs/doses/times, IV access, monitoring data every 5 minutes, any events or interventions, and post-procedure vitals. It serves as a contemporaneous clinical record, medicolegal evidence, and quality improvement tool.
DAANCE Levels of Sedation 2
According to the ASA continuum, which level of sedation is characterized by loss of consciousness with inability to be aroused even by painful stimulation?