Fig. 30.1 This MRI angiogram is from a patient with left carotid artery stenosis just above the level of the carotid artery bifurcation (arrowhead) The neurologist discussed the two possible…

Fig. 25.1 Technical ABR changes . The first tracing on the top is the baseline while the second set (second from top) was taken during obstruction of the silicone earpiece…

Fig. 19.1 IOM techniques can be divided into four groups depending on susceptibility to the effects of muscle relaxants and to the effects of halogenated anesthetics The second consideration is…

Pharmacologic agent Effect Modality: electrocochleography Resistant to effects of anesthesia Modality: auditory brainstem response Inhalation anesthetics (enflurane, halothane, isoflurane) Delay of 0.5–1.0 ms prolongation of wave V; I–V interpeak latency…

Fig. 26.1 Coronal SSFP image showing facial nerve anatomy: root exit point (RExP), attached segment (AS), root detachment point (RDP), transition zone (TZ), and cisternal portion (CP) Imaging in HFS…

Fig. 46.1 Blood flow velocity measured by TCD during carotid endarterectomy. Preinduction (a). Internal and external carotid arteries clamped (b). Significant decrease in BFV occurs with loss of pulsatility. With…

Fig. 24.1 MRI of 64-year-old woman that shows a large tumor mass in the right cerebellopontine angle (CPA). The cerebellum is shifted to the left hemisphere and the brainstem is…

Fig. 21.1 Tracing of SSEPs from left upper extremity, with normal responses from Erb’s point and the cervical region, but abnormal from the cortical leads. These abnormal tracing were caused…

Fig. 11.1 Standard 10–20 system for location of EEG scalp electrode placement (i.e., montage). The number 10 indicates distance in percentage (10 %) from nasion and inion to adjacent frontal…

Fig. 33.1 Adolescent in the headrest (ProneView, Dupaco, Oceanside, CA). The potential pressure points include the forehead and chin. It is important to make sure that the weight of the…