New Quiz 10 Dec Welcome to your Neurophysiology Name Email 1. [Age-related EEG slowing in the elderly is characterized by] 4–5 Hz activity Greater predominance over the right temporal region Occurrence in trains of 7–10 theta waves lasting 1–2 seconds Disappearance with light sleep None . 2. [Which of the following statements best describes the normal evolution of the frequency of the posterior dominant rhythm (PDR)?] It is 3 Hz by age 3 months It is 4 Hz by age 12 months It is 6 Hz by 3 years It is 10 Hz by 8 years None . 3. [What is the relative current needed to depolarize the sciatic nerve with respect to that needed to stimulate the posterior tibial nerve?] Less More Same Cannot be determined None . 4. [A 56-year-old, male is being evaluated for obstructive sleep apnea (OSA) with split-night polysomnogram (PSG). His hypnogram, including continuous positive airway pressure (CPAP) titration (labeled as “Airway Pressure”), is shown below. What would be the most appropriate CPAP pressure recommendation for this patient based on the information provided in the figure? (fig)] 8 cm water 10 cm water 12 cm water Inadequate trial, and the patient needs a full-night titration study None Comment . 5. [A 45-year-old man is referred to the electrodiagnostic laboratory for evaluation of brachial plexopathy. On examination, he is noted to have severe atrophy in the first dorsal interosseus muscle. This most likely localizes to which part of the brachial plexus?] Lateral cord Posterior cord Upper trunk Lower trunk None . 6. [A 45-year-old man with type 1 diabetes for more than 15 years is admitted with right thigh pain. His overall glycemic control is poor. He noticed pain and swelling in the right thigh in the last 24 hours. On examination, he is not able to flex or extend his right knee because of severe pain. He also has mild distal weakness and symmetrical sensory loss in his lower limbs. Bilateral ankle reflexes are absent. Which of the following is the ideal initial diagnostic test?] MRI of the right thigh MRI lumbar spine and lumbosacral plexus Nerve conduction study (NCS) and EMG study Muscle biopsy None . 7. [A tumor in the medulla can be expected to reduce or abolish all of the following waveforms except] N13 P14 N18 P31 None . 8. [Which of the following statements is true regarding stereotactic depth electrodes?] They have low impedance They are immune to muscle artifacts They are routinely used to map eloquent cortex They need to be removed within a week of implant None . 9. [Routine nerve conduction and needle EMG studies are usually normal in which of the following conditions?] Lumbosacral radiculopathy Mild large-fiber neuropathy Small-fiber neuropathy Lambert–Eaton myasthenic syndrome (LEMS) None . 10. [Stimulation of the median nerve at the wrist with recording from the scalp to obtain somatosensory evoked potential causes activation in all of the following structures except] Medial and lateral cords of brachial plexus Nucleus cuneatus Lateral lemniscus Ventral posterolateral nucleus of thalamus None . 11. [What EEG pattern is expected in neonates starting at 29 weeks of conceptional age?] Tracé discontinu Tracé alternant Burst suppression Isoelectric None . 12. [A 35-year-old man presents with right arm weakness. On examination, he has weakness of the right elbow flexion but other muscle groups are strong. He also has sensory loss over the lateral forearm. Which of the following is the most likely cause for his clinical presentation?] C5–C6 radiculopathy Medial cord brachial plexopathy Lateral cord brachial plexopathy Musculocutaneous neuropathy None . 13. [Nerve conduction and EMG studies are appropriate initial diagnostic procedures in all of the following conditions except] A 5-year-old boy with high creatine phosphokinase (CPK), enlarged calf muscles, and positive Gower’s sign A 12-year-old boy with fatigue, weakness, and ptosis A 15-year-old girl with slowly progressive distal weakness, atrophy, and sensory loss 22-year-old man with subacute onset of lower extremity numbness and weakness None . 14. [By what age do conduction velocities of motor nerves in a child reach the adult range?] 1 year 2 years 5 years 7 years None . 15. [Which of the following is a minimum requirement for recording high-frequency oscillations (HFOs)?] Microelectrodes Depth electrodes Subdural electrodes Sampling rate of 1000 Hz None . 16. [D-waves obtained by transcranial electrical stimulation (TES) during intraoperative monitoring (IOM) are characterized by all of the following except] They reflect postsynaptic potentials generated by the pyramidal neurons They are recorded by an epidural electrode They are resistant to anesthetic effects They may be normal in unilateral spinal cord abnormalities None . 17. [Alpha rhythm is] Seen in visual, somatosensory, and temporal cortices Neither facilitatory nor inhibitory during attentional processes Generated in the thalamus Generated by the pyramidal neurons in layer VI of the visual cortex None . 18. [A 50-year-old male has an EMG for weakness in the upper limb. Below is the tracing from needle EMG. What is the amplitude and firing frequency of the largest motor unit shown? (Gain: 1 mV and sweep speed 10 ms) (fig)] 7.5 mV and 5 Hz 2 mV and 10 Hz 7.5 mV and 10 Hz 5 mV and 20 Hz None Comment . 19. [A 22-year-old male with a 4-month history of seizures has an EEG shown below (filter:1–70 Hz). What is the most likely diagnosis? (fig)] Panayiotopoulos syndrome Normal awake Partial epilepsy Idiopathic generalized epilepsy with bioccipital predominance None Comment . 20. [All of the following statements regarding REM cycles are true except] The first REM period tends to be long, lasting about 30 minutes REM sleep gets longer toward the latter part of the night Newborns can spend up to 50% of sleep in REM sleep Adults tend to experience 4–6 REM cycles per night None . 21. [During a routine 30-minute EEG, the technologist records video to show the occasional leg movements that the patient exhibited. The neurologist should code this as] A routine EEG A routine EEG plus modified video recording Video-EEG monitoring Video-EEG monitoring with a modifier for reduced service None . 22. [Which of the following statements is true regarding the electrodiagnostic changes in patients with botulism?] Low compound muscle action potential (CMAP) amplitude and decrement on fast repetitive stimulation Low CMAP amplitude and increment in slow repetitive stimulation Low CMAP amplitude and normal findings on needle EMG Low CMAP amplitude, increment in fast repetitive stimulation, and active denervation potentials in weak muscles None . 23. [A 30-year-old is suspected to have brachial plexus injury after trauma. He has weakness and sensory loss in the hands. Routine nerve conduction studies revealed mildly decreased median and ulnar motor amplitudes. The resident doing the procedure is unsure if F-wave studies of the median and ulnar nerve would be helpful. What is the correct response?] Median and ulnar F-wave responses will not help with localization in this case F-wave responses should be done routinely but will not help in this case F-wave responses may help with localization in this case F-wave responses are not useful because the amplitudes were mildly decreased None . 24. [Which of the following studies can help differentiate a cervical root avulsion from brachial plexopathy?] Motor nerve conduction studies in upper limb F-wave reflex testing in upper limb Somatosensory evoked potential (SSEP) testing from the upper limb Sensory nerve conduction study None . 25. [Which of the following EEG abnormalities is associated with a risk for seizures?] Frontal phantom spike-wave discharges Occipital phantom spike-wave discharges Rudimentary spike-wave discharges (pseudo petit mal discharges) Needlelike occipital spikes None .
