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EEG and Epilepsy Diagnosis Quiz

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Questions and Answers

During a routine EEG, where is the alpha rhythm observed in a normal awake adult with eyes closed?

Posterior part of the head (correct)

Lateral part of the head

Anterior part of the head

Frontal part of the head

What is the sensitivity range of a single routine EEG for detection of interictal epileptiform discharges (IEDs) for patients with epilepsy?

10 to 20 percent

75 to 90 percent

20 to 50 percent (correct)

50 to 75 percent

What are some ways to increase the sensitivity of a routine EEG for patients with epilepsy?

Performing the EEG within 72 hours of a seizure

All of the above

Including a recording of sleep

Using special electrodes for temporal lobe epilepsy (correct)

Which of the following statements about interictal epileptiform discharges (IEDs) is true?

10 to 20 percent of patients with definite epilepsy never have IEDs Signup and view all the answers

What is the relationship between lateralized periodic discharges (LPDs) and acute symptomatic seizures?

LPDs are usually seen in the setting of acute, relatively large cerebral injury and are associated with an increased risk of acute symptomatic seizures Signup and view all the answers

Which of the following statements about slowing on EEG is true?

Temporal intermittent rhythmic delta activity (TIRDA) is highly associated with temporal lobe epilepsy Signup and view all the answers

Study Notes

EEG in a Normal Awake Adult

Alpha rhythm is observed in the occipital lobe during a routine EEG in a normal awake adult with eyes closed.

Sensitivity of Routine EEG for IED Detection

A single routine EEG has a sensitivity range of 29-55% for detection of interictal epileptiform discharges (IEDs) in patients with epilepsy.

Increasing Sensitivity of Routine EEG for IED Detection

Increasing the sensitivity of a routine EEG for patients with epilepsy can be achieved by:
- Prolonging the recording time
- Activating procedures such as sleep, hyperventilation, or photic stimulation
- Using multiple EEG recordings

Characteristics of Interictal Epileptiform Discharges (IEDs)

IEDs are highly specific for epilepsy, with a specificity of >90%.

Lateralized Periodic Discharges (LPDs) and Acute Symptomatic Seizures

Lateralized periodic discharges (LPDs) are associated with acute symptomatic seizures, particularly in the context of acute brain injury.

Slowing on EEG

Slowing on EEG is a non-specific finding that can be seen in a variety of conditions, including both acute and chronic disorders.

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Description

Test your knowledge on the clinical utility of electroencephalography (EEG) and its role in diagnosing and managing epilepsy through this informative quiz.