Handbook of EEG interpretation - part 7 potx

... arrow). S tage REM is characterized by the appearance of low-amplitude, mixed-frequency EEG activity, EMG atonia, and rapid eye move- ments. EEG activity is similar to that seen in stage I sleep; ... a 30-sec epoch showing the start of stage REM and saw tooth waves. S aw tooth waves (arrows) are 2- to 5-Hz vertex negative sharp waves that often occur in a series. They can be precu...

Ngày tải lên: 09/08/2014, 20:22

... drowsiness and light non-REM sleep. A frequent ictal pat- tern of mesial temporal origin is the sudden appearance of localized or regional background attenuation, build-up of 4- to 7- Hz rhythmic activity, ... activity. Seizures 1 07 FIGURE 4.20. Right occipital lobe seizure with a build-up of right occipital 6- to 7- Hz rhythmic ictal theta associated with the patient’s co...

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... electrographic sites of maximal nega- tivity (or positivity) by phase reversals (Figure 1.3A). Normal EEG 7 Fp1-F7 F7-T3 T3-T5 T5-O1 Fp1-Ref F7-Ref T3-Ref T5-Ref O1-Ref AB FIGURE 1 .7. Eye movement ... bibliographical references and index. ISBN-13: 97 8-1 -9 3386 4-1 1-2 (pbk. : alk. paper) ISBN-10: 1-9 3386 4-1 1 -7 (pbk. : alk. paper) 1. Electroencephalography—Handbooks,...

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... voltages of > ;75 µV, while stage 4 consists of delta present for >50% of the recording. Normal EEG 37 Activation techniques are a useful part of EEG in clinical practice and represent var- ious ... theta rhythm in an 18-year-old patient while awake. T heta rhythms are composed of 4- to 7- Hz frequencies of varying amplitude and morphologies. Approximately one-thir...

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... state. CHAPTER 2 66 FIGURE 2 .7. Continuous irregular 1. 5- to 3.0-Hz delta in a 66-year-old man with encephalopathy that was unresponsive. The above example of EEG is rep- resentative of the entire record. ... top channels are 75 µv versus 7 µv/mm at the scalp. Note the absence of IEDs in the scalp EEG compared to the intracranial EEG where they occur at 1/sec. I t is ofte...

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... 3. 17. A burst of generalized 3.5-Hz spike-and-slow waves in JME. S pike-and-slow-wave complexes that have a repetition rate of >3 Hz are referred to as fast GSW. JME is the most common idio- pathic ... generalized burst of 3-Hz spike-and-slow waves in a patient with IGE and absence seizures. T he prototypic abnormality on EEG seen with generalized seizures is the 3-Hz spike-and-s...

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... it is often use- ful to change the paper speed from 10 mm/sec to 30 mm/sec for bet- ter identification of sleep spindles. CHAPTER 6 160 FIGURE 5.13. BiPLEDs in a 3 7- year-old HIV-positive man ... 30-sec epoch showing late stage I sleep. I n this epoch of stage I sleep, the EEG consists of mixed-frequency activity, mostly in the 2- to 7- Hz range, and the slow eye movements have...

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... figure above, bursts of 3- and 4-Hz dis- charges ( arrows) were noted frequently during the PSG, particularly in light stages of sleep. Polysomnography 205 FIGURE 6.43. This is a 60-sec epoch demonstrating ... MSLT are the same as in PSG. In addi- tion to the loss of alpha rhythm, there is appearance of slow, rolling eye movements, mixed-frequency activity in the 2- to 7- Hz ra...

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... doses of anes- thetic gases, although there is less EMG, the SEP waveforms’ ampli- Neurophysiologic Intraoperative Monitoring 241 FIGURE 7. 7. Intraoperative BAEP monitoring showing loss of wave ... CHAPTER 7 234 FIGURE 7. 8. Intraoperative BAEP monitoring showing latency prolonga- tion and amplitude decrement of the wave V toward the end of the surgery due to technical problems...

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... synchrony (SBS) in, 82, 87 sharp transients as, 75 sharp waves as, 75 , 77 , 79 –81 sharp-and-slow waves in, 87 sleep and, 78 spike waves as, 75 , 80 spike-and-polyspike discharge in, 82 spike-and-slow wave discharge as, ... of, 75 , 76 polyspike-and-wave discharge as, 75 polyspikes as, 75 positive spikes in, 77 rapid eye movement (REM) sleep and, 78 rolandic sharp waves...

Ngày tải lên: 09/08/2014, 20:22