CNIM Practice Exam 1

CNIM Practice Exam 1 Which of the following is least likely to cause electrical interference in the operating room? - The pneumatic drill If the monitoring instrument develops an inability to average, steps to take would include all the following except:? - Consult with the anesthesiologist anesthesia changes Lying between the adjacent surfaces of the vertebral bodies and bonding them together, are the: ? - Intervertebral discs The dorsal column pathways synapse at which loci on their way to the sensory cortex? - Nucleus cuneatus and thalamus Ground electrodes for SSEP recordings? - Are best placed between stimulation and recording electrodes A significant reduction in amplitude of ABR wave V can result from? - Intravenous lidocaine Although the use of electrical cautery can obliterate EP waveforms, intraoperative monitoring should be continued? - By monitoring the raw (unaveraged) data The effects of halogenated agents on the cortical somatosensory evoked potentials are? - An increase in latencies and a decrease in amplitudes The area of greatest risk for ischemic injury during carotid endarterectomy is? - The middle cerebral artery Which of the following most likely reflects sustained traction or compression of a nerve during EMG? - A "train" response Delta activity in awake adults with eyes is usually? - Abnormal Delta activity in awake adults with eyes open is usually? - Abnormal EP waveforms contralateral to the surgical site are monitored to differentiate between? - systematic changes and local manipulation SSEPs are most likely to be highly variable and less reliable in patients with? - Neuromuscular disease The effects of Harrington rod distraction on the spinal cord can be tested by all of the following except? - Dorsal root stimulation The input impedance of a differential amplifier must be at least - 10 megaohms The input impedance of a differential amplifier must be at least - 10 mega ohms which is not true of hyperperfusion during carotid endarterectomy? - It is most easily detected by EEG Babinski's sign is: - Plantar extension of the hallux when the sole of the foot is stroked Spondylosis is: - Degeneration of the spine - A spontaneous emg response - A response to EMG stimulation with an electrical probe Identification of wave V of the BAEP may require? - Decreasing stimulus intensity Excitation of the postsynaptic neuron is caused by the neurotransmitter? - Glutamate Generally speaking, rate increases above 30 per second in BAEP studies? - Will increase the latency and decrease the amplitude of the BAEP Multiple sclerosis, spinal cord injury, and brain trauma can lead to debilitating spasticity that has been relieved in some patients following:? - Selective dorsal rhizotomy The type of artifact most likely associated with blood warming equipment is? - 60 Hz A patient in a state of surgical anesthesia using nitrous oxide is likely to have a drop in SSEP amplitudes of? - 75% The recommended location for recording the cervical cord response to median nerve stimulation is:? - C5 What would you monitor for a microvascular decompression of the Vth nerve? - Masseter The intraoperative BAEP is most likely to be obscured by? - Muscle artifact The phenomenon called "aliasing"? - Refers to an erroneous representation of an analog signal by digital values Vertical resolution depends on? - Number of bits The use of ER insert earphones results in? - Separating wave I from the stimulus artifact Monitoring somatosensory function will most likely fail to recognize changes in? - Anterior spinal cord function An advantage of using grid or strip electrodes over the "Crown of Thorns" for recording ECoG is the ability to? - Slide them under the dura to unexposed areas Vascular malformation of the posterior fossa associated with Hemifacial spasm and facial paresis may cause? - BAEP latency abnormalities What intravenous drug is used to maintain hypotension? - Nutroprusside Eliciting a motor twitch with PTN stimulation, you expect to see: - Plantar flexion of the toes What should be monitored during a vestibular neurectomy? - Ipsilateral BAEP and facial nerve The earliest obligate component of the median nerve SSEP that is measured far-field is generated in the: - Medial lemniscus