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When a Single EEG Is Not Enough 

When a Single EEG Is Not Enough
Chapter:
When a Single EEG Is Not Enough
Source:
Neurocritical Care (2 ed.)
Author(s):

Eelco F. M. Wijdicks

, Alejandro A. Rabinstein

, Sara E. Hocker

, and Jennifer E. Fugate

DOI:
10.1093/med/9780190602659.003.0023

Electroencephalography (EEG) is an important diagnostic tool for specific indications. Detection of seizures is greater than when using a spot electroencephalogram. Indications for electroencephalography and validity of monitoring are discussed in this chapter. Continuous EEG monitoring will increase the yield of detection of seizures but also nonspecific transients. Nonconvulsive seizures may occur in 20–30% of critically ill neurological patients and half are detected within the first 30 minutes of monitoring. EEG monitoring should be continued until the clinical question is answered and either a) the patient has recovered to neurological baseline or b) no seizures have occurred for 2 hours in patients without epileptiform abnormalities or for 12–24 hours in patients with epileptiform abnormalities.

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