Which of the following are True (T) or False (F) __ Left temporal sharp waves ar

Question

Which of the following are True (T) or False (F)

__ Left temporal sharp waves are focal

__ Generalized slowing is diffuse

__ Bilaterally synchronous spike-wave discharges are focal

__ Spikes are defined by their duration

__ Classical 3/sec spike and slow wave complexes begin in one hemisphere and spread to the opposite side

__ The amplitude of 3/sec spike slow wave complexes is greator anteriorly

__ Spikes are usually only seen during a "clinical seizure"

__ A spike differs from a sharp wave by virtue of its amplitude (i.e. a spike is higher in amplitude).

Explanation / Answer

1 True Sharp wave every 1-5 sec that start focally,usually affects thre temporal lobe of the brain.

2True EEG is a test of cerebral function ,diffuse/generalized abnormal patterns are by definition indicative of diffuse brain dysfunction.

3True ,because ictal rythms may include bilaterally synchronous spike and wave in seizures that evolve to a focal to bilateral tonic-clonic seizure.

4 True ,spikes are fast waves and lasts less than 80 sec.so they are defined by duration.

5False

6

7 True ,clinical seizure lateralization in mesial temporal lobe epilepsy can now only be achieved in patients with unitemporal interictal spikes.

8False,Spikes and sharpwaves differ based on their duration,the duration of spike is less than 70ms whereas that of a sharp wave is between 70 and200ms.

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