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WorksheetsNeurophysiology_ONE
Total questions: 15
Worksheet time: 8mins
The distance measurement from Cz to Pz is 6.8 cm. What is the distance measurement from nasion to inion
34 cm
35 mm
36 mm
37 cm
What input voltage is necessary to give a calibration deflection between 5 and 10 mm if the sensitivity is 30µV/mm
10 µV
50 µV
100 µV
200 µV
During the recording of cerebral activity, the calibration input voltage is changed from 50 µV to 100 µV. What will be the result
clipping of the waveform
a two-fold increase in amplitude
a one-half reduction of amplitude
no effect on the activity being recorded
In Transcranial Magnetic Stimulation, the corticospinal excitability of human subjects is often determined through identifying the
coil orientation
motor threshold
sensory threshold
distance threshold
The electrode site that is located 1 cm above, one third the distance out from the left external auditory meatus toward the left outer canthus is called
F5
LOC
T1 or F9
F7 or F8
Shortened Waves I–V interpeak latency (IPL) is seen in which of the following conditions?
Brainstem glioma
Cochlear hearing loss
Conductive hearing loss
Multiple sclerosis (MS) plaque in brainstem
A 60-year-old man with low back pain has a tibial H-reflex testing performed. The afferent and efferent loops of the H-reflex are
antidromic sensory and antidromic motor
antidromic sensory and orthodromic motor
orthodromic sensory and antidromic motor
orthodromic sensory and orthodromic motor
Which of the following is true regarding somatosensory evoked potential (SSEP) changes during intraoperative operative monitoring (IOM)?
Transient intraoperative SSEP changes do not predict postoperative SSEP deterioration
Persistence of SSEP changes at the end of surgery increases the risk of adverse postoperative clinical outcome
Transient or persistent changes in central conduction time (CCT) compared to baseline occur in a small number of patients
Transient intraoperative SSEP changes can be associated with adverse postoperative clinical outcome in 25% of patients
When recording for electrocerebral inactivity (ECI), the interelectrode distance should be at least
7 cm
10 cm
12 cm
14 cm
Six to seven Hz theta activity is typically seen in a normal adult in which of the following
in the occipital regions
at the onset of drowsiness
in the centro-temporal regions during photic stimulation
in low voltage, paroxysmal bursts over the frontal regions
______is characterized by multiple seizure types that are difficult to control, especially atonic seizures and atypical absences, in addition to generalized convulsions, and an abnormal interictal EEG with generalized 2 to 2.5 Hz slow spike and wave discharges
Dystonia
Benign Rolandic Epilepsy
Lennox-Gastaut Syndrome
Sub-acute Sclerosing Panencephalitis (SSPE)
Monitoring body position during Polysomnography test is important to assess
sleep staging
eye movement
sleep disordered breathing
periodic leg movement syndrome (plms)
When performing a 3-point ulnar nerve stimulation (at the wrist, below elbow, and above elbow), it is important to perform the study with the elbow flexed. Otherwise, it will result in
artifactual decrease in ulnar cmap amplitude
artifactual increase in conduction velocity across the elbow
artifactual decrease in conduction velocity across the elbow
artifactual increase in ulnar compound muscle action potential (cmap) amplitude
While performing the tibial H reflex, the H wave amplitude decreases with increasing stimulus intensity because?
At higher stimulus intensity, a afferent fibers are not activated
At higher stimulus intensity, the M response suppresses H waves
At higher stimulus intensity, there is synergy between antidromic motor stimulus and orthodromic H reflex potentials
At higher stimulus intensity, there is increased collision between antidromic motor stimulus and orthodromic H reflex potentials
In a patient with suspected Myasthenia Gravis (MG), needle EMG is most likely to reveal?
Variation in motor unit amplitude
Positive sharp waves and fibrillation potential
Large-amplitude polyphasic motor unit potential
Increased recruitment frequency if the muscle is weak
