Neuro, Ob, ENT, Optho Flashcards
common neuro procedures
anterior cervical dicectomy and fusion
posterior lumbar interbody fusion
lumbar laminectomy
craniotomy
neuromonitoring purpose
prevent and detect neurological injury
what can happen from nerve injury or ischemia
disabling weakness
paralysis
loss of sensation
what is monitored during neurosurgery
sensory and motor function
most common method of neuromonitoring
evoked potentials
evoked potential
stimulus generated and result is measured at target tissue
- assessed by latency and amplitude of waveforms
what delivers/receives impulses of evoked potential
tiny needles
evoked potential: somatosensory
SSEPs
afferent nerve conduction
stimulates proprioception, pressure, vibration at peripehral nerve
SSEPs can cause what
artifact readings with SpO2 and BP
hand/feet moving regulary
evoked potentials: motor
MEPs
efferent nerve conduction
stimulates muscle movement in brain
MEPs can cause
large jolt
what changes to anesthetics during neuromonitoring?
no non-depolarizing muscle relaxants
<0.5 MAC of gas
typical anesthetic for neuromonitoring
TIVA
or
<0.5 MAC + IV anesthetics
– propofol + remi
– ketamine/precedex/lido
caveats to neuromonitoring paralysis
anterior approach lumbar will require paralysis
some surgeons request low dose paralysis
what must you place during a neuromonitoring case?
soft bite block
anterior cervical positioning
supine
arms tucked
cervical visualizer/pins/traction
anterior cervical considerations
IV access/infusions prior to prep/drape
BP might need to move to leg
arterial line
posterior lumbar positioning
prone
arms in superman
what is critical to do prior to positionming pt for posterior lumbar?
100% fiO2
what should you be checking frequently during prone cases?
eyes/nose are pressure free
posterior thoracic positioning
prone
tucked arms
posterior cervical positioning
prone
tucked arms
mayfield pins
what is important to consider during mayfield pin placement?
pt needs to be deep
this is very stimulating
have propofol ready to bolus
crani positioning
supine or prone
arms tucked
possible mayfield pins
crani bed positioning
180 degrees
considerations when bed is turned 90 or 180 degrees
circuit extension
IV extension
TOF twitches on ankle
considerations for prone
ETT extension
temp probe for spine cases
use esophageal
which monitor can you use to monitor during TIVA
BIS
propofol spine dosing
75-150mcg/kg/min
remi spine dosing
0.05-0.2 mcg/kg/min
phenylephrone spine dosing
0.1-1 mcg/kg/min
which cranis dont usually need an arterial line for healthy pt
burr hole decompression
what meds can help for tight BP control
phenylephrine
cleviprex
cardenen
nitroglycerine