By Sudhansu Chokroverty, Robert Thomas, Meeta Bhatt

This complete atlas of tracings of polysomnographic stories covers the technical features of engaging in stories, and comprises the good points of a few of the grownup and pediatric sleep issues.

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Some laboratories use eight to ten channels of EEG (see Figure 1–1) to cover the parasagittal and the temporal areas of the brain to record possible focal or diffuse EEG abnormalities as well as for recording epileptiform activities. The technician should be familiar with the measurement technique for placement of the electrodes according to the 10-20 international system. , A1, A2, Cz, Pz) are recommended. NORMAL WAKING AND SLEEP ELECTROENCEPHALOGRAPHY RHYTHMS IN ADULTS FIGURE 2–1. (From Keenan S.

The scalp EEG recording voltages are attenuated and reflect about one tenth of the voltage recorded over the cortical surface. The electrical signals are transmitted by the electrodes and conducting gel through the electrode wires, which are attached between the electrodes and the jack box of the polysomnography (PSG) equipment. Different types of electrodes are available but for recording EEG activities, the best electrodes to use are the gold cup electrodes with holes in the center and the silver-silver chloride electrodes.

36 Electroencephalography for the Sleep Specialists 31 FIGURE 2–2. A: Normal awake EEG pattern characterized by symmetrical, sinusoidal posterior dominant alpha rhythm at 11 to 12 hertz, 82 to 105 microvolts in a 40-year-old woman at a conventional EEG paper speed of 10 seconds per page. Eye movement artifact is noted in channels linked to frontal FP1 and FP2 electrodes. 32 Electroencephalography for the Sleep Specialists FIGURE 2–2, cont’d B: Same subject data as in A viewed at a 30-second epoch.

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