Clinical EEG (electroencephalography)
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Clin Electroencephalogr · Apr 1996
Case ReportsDiffuse theta activity and spindle-like bursts during coma after cardiac arrest.
An usual combination of diffuse theta activity with intermittent bursts of spindle-like activity, followed by 2-3 Hz rhythmic discharges and lasting about 7 seconds, was noted in a coma patient after cardiac arrest. We speculate that the theta pattern coma and spindle-like bursts originated in the pontine region, and that those bursts in turn triggered or recruited rhythmic slow-wave complexes similar to absence discharges.
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Clin Electroencephalogr · Jul 1994
Case ReportsPropofol, seizures and generalized paroxysmal fast activity in the EEG.
Propofol is a relatively new anesthetic agent used in outpatient surgery. Some investigators use it in the treatment of status epilepticus and in epilepsy surgery and have concluded that propofol has an anticonvulsant effect. ⋯ Different EEG abnormalities, and no abnormality, have been associated with propofol. We report a case of a healthy man who developed nonconvulsive seizures and generalized paroxysmal fast activity in his EEG following use of propofol for anesthesia.
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Clin Electroencephalogr · Oct 1993
Case ReportsPersistent synchronous periodic discharges caused by anoxic encephalopathy due to cardiopulmonary arrest.
We report a patient with vegetative state induced by anoxic encephalopathy due to cardiopulmonary arrest who showed synchronous periodic discharges for a prolonged period. The patient was a 47-year-old man admitted to our hospital for depression, who suddenly developed cardiopulmonary arrest of unknown etiology, and entered chronic vegetative state as a result of anoxic encephalopathy. ⋯ The periodicity of synchronous periodic discharges was gradually prolonged, with the course again similar to the discharges in CJD. The mechanism of occurrence is considered to be similar to that of synchronous periodic discharges in CJD.
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Clin Electroencephalogr · Jul 1993
Quantification of alpha rhythm desynchronization using the acceleration spectrum entropy of the EEG.
Desynchronization of the alpha rhythm is usually quantified as a loss of power in the alpha band. In this study we describe an alternative approach where desynchronization is characterized as an increase in the irregularity of the EEG signal. A new measure, the acceleration spectrum entropy (ASE), is used to quantify EEG irregularity. ⋯ The ASE was calculated for short EEG epochs under eyes closed and eyes open conditions in 15 subjects. There was a significant increase in ASE in the eyes open condition, reflecting an increase in EEG complexity. The ASE is a sensitive measure of EEG desynchronization.
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The topographic maps of 100 patients with various types of headache (classic migraine, non-classic migraine, muscle contraction, mixed and post-traumatic) were compared to the brain maps of 38 normal controls. Patients with classic migraine showed 11 markers, but especially three of high amplitude theta on 0(1) and alpha on 0(1) and T6, thereby identifying 82% of the patients with only 30% as false positives. Patients with other types of headaches in general did not show useful markers.