Download Atlas of sleep medicine by Sudhansu Chokroverty, Robert Thomas, Meeta Bhatt PDF

By Sudhansu Chokroverty, Robert Thomas, Meeta Bhatt

This complete atlas of tracings of polysomnographic stories covers the technical facets of accomplishing experiences, and contains the beneficial properties of some of the grownup and pediatric sleep problems.

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The same subject data as in Figure 1–10 viewed over three 30-second epochs. Electroencephalography for the Sleep Specialists FIGURE 2–11, cont’d. 51 52 Electroencephalography for the Sleep Specialists FIGURE 2–11, cont’d. photic stimulation during routine EEG recording in the daytime in order to bring out the ictal or interictal epileptiform patterns. Special basal temporal electrodes (T1, T2, nasopharyngeal, and sphenoidal electrodes) should be used in addition to the routine electrode placement in patients suspected of partial complex seizure.

The electrode should be reset and gel applied. If the artifact persists, then electrodes need to be changed. Other sources of artifacts are the electrode wires, the cables, and the switches. In the PSG machine, random fluctuations of charges result in some instrumental noise artifacts. If the sensitivity is greater than 2 microvolts per millimeter, which is not generally used in PSG recordings, then these instrument artifacts may interfere with the recording. Loose contacts in switches or wires may also cause sudden changes in voltage or loss of signal.

EEG shows evidence of a brief burst of frontal intermittent rhythmic delta activity (FIRDA), synchronously recorded over both hemispheres. FIRDA was originally believed to arise from deep midline pathology, which is demonstrated in this case. However, FIRDA is now believed to be anatomically nonlocalizing and indicates diffuse cerebral dysfunction secondary to metabolic or structural involvement. 42 Electroencephalography for the Sleep Specialists FIGURE 2–6, cont’d D: Same subject data as in C viewed at a 30-second epoch.

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