Cnim 1000 practice questions Fixed

Cnim 1000 practice questions Fixed During a scoliosis surgery, you recognize a gradual latency increase of 3.5 msec in the PTN cortical response, the subcortical response appears to be shifted out almost as much. All response amplitudes are unchanged. What is the appropriate action to take? a. Ignore the change, it means nothing. b. Inform the surgeon immediately that changes consistent with spinal cord injury may have occurred. Recommend a wake up test. c. Check the latencies of the PF and MN responses to see if they are also shifted, indicating a possible temperature effect. Verify this by checking the patient's body temperature. d. Ask the anesthetist to reduce the gases. You are seeing changes consistent with increased depth of anesthesia. - ANSWER-B Which would not be considered contamination of the sterile field: a. Reaching your arm over the sterile table b. Brushing your bouffant cap against the microscope drape c. Reaching underneath the surgeon's gown to grab his pager d. Dropping a junior mint into the wound - ANSWER-C The Auditory Evoked Potential (ABR) typically involves what type of stimulus? a. Tone burst b. Electrical pulse c. Click sound d. White noise - ANSWER-C Which of the following will result in significantly elevated SSEP latencies? a. Positive patellar reflex b. Brown-Sequard syndrome c. Charcot-Marie Tooth disease d. Carotid stenosis - ANSWER-C The Vertical Resolution of an evoked potential system depends primarily on: a. The analysis period b. The sampling Rate c. The filter settings d. The number of bits in the A/D Converter - ANSWER-D During a thoracic laminectomy, a rapid loss of the right PTN cortical responses occurs. The cervical response is too poor to evaluate, and the popliteal fossa responses are unchanged. What should you do first? a. Run MN and check anesthetic levels. b. Inform the surgeon immediately and indicate that the changes are consistent with a right hemi-cord injury. c. Check the right stimulator output with a bar electrode. d. Reset the amplifier, check your recording parameters, and wait to see if the responses return - ANSWER-B The most frequent sour