CNIM Practice Exam 1 Solved 100% Correct!!

CNIM Practice Exam 1 Solved 100% Correct!!During a median nerve preoperative study, a patient has discomfort at the wrist. Stimulation electrodes are 10 mm gold disk, stimulus intensity is 20 mA, and stimulus duration is 100 μsec. Which of the following would most likely reduce the patient's discomfort while maintaining adequate stimulation? - Answer Decrease number of repetitions What is not an advantage of epidural recordings? - Answer Absence of significant artifact The stimulation rate is determined by the - Answer analysis time Somatosensory evoked potentials are less reliable in patients with ? - Answer Neuromuscular disease When placing PTN stimulator you should not - Answer Secure the tape and bands around the whole ankle A differential amplifier with a Gain of 1,000,000 has a 0.2 μV signal at its positive input and a 0.8 μV signal at its negative input. The output will be: - Answer A downward peak of 0.6V The lumbar potential is generated from - Answer Post-synaptic responses The P31 response to posterior tibial nerve stimulation - Answer Is recordable over a generalized region of scalp Which of the following has the greatest effect on SEP monitoring? - Answer Sevoflurane A shocking sensation that occurs throughout the body during neck flexion is called - Answer L'Hermittes sign Lowering the SSEP hicut filter from 500 Hz to 200 Hz may cause the cortical peaks to: - Answer Appear longer in latency How many waves of a 60 Hz signal should you see in a 250 mS sweep? - Answer 15 Activation of an action potential of a neuron will depend on: - Answer Its membrane potential based on the spatiotemporal summation of its excitatory and inhibitory inputs From left to right pre-auricular points is measured 30 cm. The C3 electrode is located: - Answer 9 cm medial to the left pre-auricular point The most frequent source of patient infection in the operating room derives from: - Answer The patient's own endogenous flora CNIM Practice Exam 1 Solved 100% Correct!! Page 2 of 12 What is the maximum time in which to expect EEG changes following cross clamping of the carotid? - Answer Two minutes Cranial nerve IV can be monitored using electrodes inserted into the - Answer Superior oblique According to the nurses guidelines how far do you need to be from the sterile field? - Answer 18 inches When no phase reversal is present in an anterior-posterior cortical grid recording: - Answer The maximum amplitude response is closest to the central sulcus EEG will most likely disappear at what body temperature - Answer 16 degrees C Epileptiform discharges can be localized by: - Answer A phase reversal between two channels Why is platinum used in epidural recordings - Answer Other metals become toxic when current is applied to them due to the ionic What will most likely effect SSEPs? - Answer Spinal cord tumor Excessive cerumen may cause - Answer Absence of the BAER Which of the following can increase SEP amplitude? - Answer Etomidate Which montage would you use to confirm a change in the Cz'-Fz cortical response to PTN stimulation? - Answer Cpc-Cpi CNS depressants cause: - Answer Minimal effects in ABRs After-discharges occur after what? - Answer Direct cortical stimulation An ABR has a normal wave one and then delayed wave I-V on one side. What type of surgery is this most consistent with? - Answer CPA Tumor An optimal repetition rate for BAEP's is - Answer 31Hz The input impedance of a differential amplifier should be: - Answer At least 100 Megaohms Lower motor neurons primarily exit the spinal cord through: - Answer Ventral nerve roots Lack of after-discharges indicates: - Answer The stimulus is likely below the threshold of seizure activation CNIM Practice Exam 1 Solved 100% Correct!! Page 3 of 12 There were epidural recordings to PTN stim from T5 and from C7. The T5 had a stable response throughout the tumor surgery, while the C7 had no response and then a great one after the tumor removal. Where was the tumor? - Answer Rostral to T6 and caudal to C7 What is the advantage to using an insulated bipolar electrode for intracranial facial nerve stimulation? - Answer Prevent current shunting to other cranial nerves What is the maximum allowable leakage current from the isolated amplifier inputs through the patient leads? - Answer 10 μA When you stimulate PTN where do you want to record your TO4? - Answer Abductor Hallucis Brevis The most appropriate ABR interstimulus interval is: - Answer 20mS Which of the following is NOT a safety concern regarding the use of TcMEPs? - Answer Patient history of cerebral palsy What is the minimum required vertical resolution of an evoked potential system? - Answer 8 bits Which of the following is most affected by halogenated agents? - Answer Posterior tibial cortical potential A 10-bit A/D Converter has how many discrete voltage values in its range? - Answer 1024 If you cannot replace an electrode that has come out during surgery you: - Answer Use a duplicate The C8 nerve root exits the spinal cord: - Answer Above the T1 vertebrae When an electrode falls on the floor you: - Answer You immediately pick it up and dispose of it in a sharps container A 60 Hz artifact would most likely be caused by - Answer Infusion pump Midazolam is what type of drug? - Answer Benzodiazepine If you get artifact in you subcortical channel you: - Answer Use a spare CS5 electrode Where is the ABR wave V generated? - Answer Midbrain How should needle electrodes be discarded? - Answer Only is a red puncture-proof sharps container