BIS Monitoring Word Scramble
|
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Question | Answer |
BIS | "bispectral index" - noninvasive neurophysiologic monitoring device that continually analyzes pts EEG to assess the level of consciousness during anesthesia |
EEG | 1. monitors cerebral fx & provides early evidence of cerebral ischemia 2. records stages of wakefulness and consciousness resulting from neurotransmitter activity |
depth of anesthesia | likelihood of forming memory |
bispectral analysis | bispectral index of an EEG = wt'd sum of EEG subparameters of time domain, frequency domain, higher order spectral info |
how the BIS works | EEG that employs computerized algorithms to incorporate established EEG patterns into usable info |
risk for awareness - high to low | 1. OB (GA is emergent ie 30 sec) 2. major trauma 3. CP bypass 4. physiologically most fragile (elderly) 5. multiple co-morbidities 6. ETOH/drug abusers |
factors contributing to awareness | 1. polypharmaceutical approach to anesthetic 2. TIVA (gas gives better amnesia) 3. premature lightening for rapid turnover |
steps to ↓ risk of awareness | 1. premedicate w/ amnestic drugs 2. give more than "sleep dose" of induction agents if followed immediately by intubation 3. avoid NMBDs unless absolutely necessary 4. periodic maintenance of machine/vaporizers 5. CHECK machine/vent prior to use |
BIS = ZERO | EEG silence |
BIS = 100 | expected value in fully awake adult |
BIS = 40-60 | generally accepted level for GA (manufacturer claims never been recall case when documented BIS < 60) |
BIS = 75-80 | pt can start to move |
BIS changes with noxious stimuli | lack of analgesia (can be used to monitor lack of analgesia - lower drug utilization w/o ↑ somatic s/s of light anesthesia ie movement, hemodynamics) |
when to place BIS | ideally before induction to establish baseline |
BIS SQI | Signal Quality Index - quality of EEG 0-100 ~want ↑↑ # ~not reliable if <80 |
BIS EMG | Electromyograph - 30-55 - absolute power in 70-110 Hz frequency band (this freq. band contains power from muscle activity as well as high freq artifacts ~ want ↓↓ # ~ reasonably accurate BIS if < 25 |
BIS SR | suppression ratio - indicates % of suppressed (flatline) EEG detected over last 63 sec |
BIS smoothing rate | time period over which artifact-free data is analyzed to calculate the BIS #. affects trend & #. Factory default = 15 sec. 'smoother' trend with 30 sec. |
Created by:
girlnamedsharon
Popular Nursing sets