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Misc potentials

Miscellaneous potentials

QuestionAnswer
The average stimulus rate for SEPs used for intraoperative monitoring is __ per second 4.3
THe average number of responses for intraop monitoring using SEPs is __ to __ 1000, 2000
__ (arm/eg) SEPs are often used during carotid endarterectomy to evaluate CBF arm
SNAPs stands for ____ sensory nerve action potential
SNAPs usually have a large __ (negative/positive) peak followed by a smaller __ (negative/positive) peak negative, positive
The three areas used to stimulate the the trigeminal nerve gums, lips, mental nerve
The positive peak for the trigeminal nerve is about __ msec after stimulation 20
Electrical stimulation of mixed or sensory nerves can induce muscle activation beginning __ msec after the stimulus 15
The __ is presented by presenting two stimuli, one more common than the other, with the patient attending to the rarer stimuli ("oddball paradigm") P300
Recordings for the P300 are made over an electrode on the __ or __ head and a reference central, posterior
The P300 is sometimes referred to as __ P3
The posited site of the P300 is in the __ __ lobe medial temporal
____ is an evoked potential contingent on a ptient's conscious perception of a stimulus; it is performed by presenting pairs of stimuli separated by 1-2 sec contingent negative variation
During ___ EPs, a patient is presented with a first signal as a warning (often a click) followed by an imperative (such as a flashing light) that requires a response (such as pushing a button) contingent negative variation
The CNV __ (Will/will not) develop if an imperative stimulus follows a minority of warning stimuli will not
Recordings for CNV are made between the __ and __ ear, vertex
Recordings for CNV require averaging __ or more responses 10
The normal CNV begins about __ msec after the warning stimulus and has a maximum about __ msec after the first stimulus 400, 800
CNV is maximal at the __ of the head vertex
Averaging the potentials that precede movement shows a rising negative potential that begins ~ __ second prior to movement 1
Typical latency for P300 ranges from __ - __ msec 250, 600
Three factors that increase latency for P300 attention, intensity, time to distinguish stimulus
P300 begins at age___ 3 months
As children become older, P300 begins more restricted to the __ lobe parietal
Causes of prolonged P300 AD, ESRD, ETOH, MR, PD, schizophrenia
The two names for the potential seen prior to voluntary movement bereitschaftpotential, readiness potential
The __ can be used to diagnose psychogenic movement disorders; it is seen 0.5 to 1 second prior to voluntary movement readiness
TMS produces an effect of __ - __ Tesla 1, 2
TMS most likely acts at bends in __ fibers of brain U
TMS acts at axon fibers that are __ (parallel/perpendicular) to the surface of the brain parallel
The preferred form of electrical stimulation for MEPs anodal
For MEPs, the anode is placed here motor strip
For MEPs, the cathode is placed here around the head
For MEPs, recording electrodes are placed here muscle to be studied
Recordings for MEPs are most commonly made in the __ (arm/leg) arm
The most common muscle used to record MEPs abductor digiti minimi
The most commonly studied leg muscle in MEPs tibialis anterior
For MEPs, the reference electrode is usually placed __ (proximally/distally) distally
Bandpass for MEPs is usually set to __ - ___ 3, 3000
Analysis time for MEPs is usually set to __ msec 50
For MEPs, stimulus intensity is increased until a __ is seen, then increased at increments of __%; after that, stimuli are delivered at __% above threshold CMAP, 5, 15
For MEPs, __ stimuli are delivered and the responses are superimposed 3
For magnetic stimulation MEPs, the muscle level for biceps is __ C3
For magnetic stimulation MEPs, the muscle level for triceps is __ C4
For magnetic stimulation MEPs, the muscle level for abductor digiti minimi is __ C5
For biceps and triceps, peripheral stimulation at Erbs' point with MEPs is always __ (electric/magnetic) magnetic
For hand muscles, stimulation for MEPs is delivered to the innervating nerves via __ (electric/magnetic) stimulation electric
MEPs __ (can/cannot) be done in patients with skull defects with special precautions cannot
MEPs __ (can/cannot) be done in patients with metal in the head with special precautions cannot
MEPs __ (can/cannot) be done in patients with h/o epilepsy with special precautions cannot
MEPs __ (can/cannot) be done in patients with spinal stimulators with special precautions can
MEPs __ (can/cannot) be done in patients with implanted pumps with special precautions can
___ in MEPs is the difference between cortical latency and spinal latency central motor conduction time
Central motor conduction time in MEPs is the difference between __ and __ latency cortical, spinal
__ is usually associated with absent MEPs ALS
Created by: schmittse