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ISQs on EEG

28 posts in this topic

EEG

1. Somnambulism is most likely to occur in Stage III and IV sleep

2. Benzodiazepines may increase beta waves on the EEG

3. Metabolic disorders often cause increased alpha waves on the EEG

4. An inter-ictal EEG in automatisms is of limited value

5. An inter-ictal EEG in automatisms typically shows 8Hz and 14Hz spikes

6. Barbiturates increase fast activity on the EEG

7. More than 50% of children with conduct disorder have EEG abnormalities

8. An abnormal gait is more suggestive of early Alzheimer’s disease than vascular dementia

9. Cognitive impairment is seen in chronic multiple sclerosis

10. Alpha waves are slowed in eeg by chronic benzo use

11. 5%of elderly schizophrenics have a family history of schizophrenia in the first degree relatives

12. Emotional lability in a patient with dementia indicates vascular dementia rather than AD

13. Nocturnal enuresis present in all parts of sleep

14.EEG has exaggerated spikes in Huntington's disease

15. CNV is an EEG evoked potential

16. Alpha wave is seen in occipital lobe predominantly

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1. Somnambulism is most likely to occur in Stage III and IV sleep

True: The child usually 8-14 calmy arises from bed with blank facial expression, can only be woken with difficulty. The child is in a state of altered consciousness at the deep level of sleep (3 and 4).

Has to be nrem sleep as in rem peripheral muscles are paralysed.

Companion to psychiaric studies

kendell and zeally p672 5th ed

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Somnambulism is most likely to occur in Stage III and IV sleep

TRUE (page 754, Sleepwalking Disorder, Synopsis of Psychiatry 8th Ed, Kaplan & Sadock

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Benzodiazepines may increase beta waves on the EEG

TRUE

(Page 141, Exam notes in Psych, Basic Sciences, Malhi & Mitchell)

barbiturates/ benzos, increase beta & theta activity

tricyclics increase beta, theta & delta activity

neuroleptics increase theta & delta activity

alcohol increases alpha activity

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Metabolic disorders often cause increased alpha waves on the EEG

FALSE

Hemorrhage, infarction, infection, trauma, METABOLIC or endocrine disorders cause diffuse symmetrical changes, reduced alpha

increased delta & theta activity

(Page 140, Exam notes in Psych, Basic Sciences, Malhi & Mitchell)

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Barbiturates increase fast activity on the EEG

TRUE

Barbiturates & Benzos increase beta activity

(Page 141, Exam notes in psych, Basic sciences, Malhi & Mitchell)

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Alpha wave is seen in occipital lobe predominantly

TRUE

(Page 139, Exam Notes in Psych, Basic sciences, Malhi & Mitchell)

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15. CNV is an EEG evoked potential

TRUE

(Page142, Exam notes in psych, Basic Sc, Malhi & Mitchell)

CNV = contingent negative variation. It is an evoked potential 'elicited by initially providing a priming stimulus & then one which requires a response...

CNV 'correlates to attention & motivation, and is therefore attenuated by by lack of stimulation or drugs like barbiturates'

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14.EEG has exaggerated spikes in Huntington's disease

FALSE

Diffuse flattening, with low amplitude theta & delta waves

(Page141, Exam notes in psych, basic sciences, Malhi & Mitchell)

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13. Nocturnal enuresis present in all parts of sleep

TRUE

(Page 121, Child Psych, Goodman & Scott)

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Crikey, someone's been hitting the books today, dk2004! Great contributions to the Forum. Let's hope others follow your example!

:lol:

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12. Emotional lability in a patient with dementia indicates vascular dementia rather than AD

FALSE

This is one of the basic symptoms required in ICD-10 for a general diagnosis of dementia, and not specific to any subtype.

(Table 10.3-9 [item G4], Page 336, Kaplan & sadock's synopsis of Psych)

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9. Cognitive impairment is seen in chronic multiple sclerosis

TRUE

(Page 320, Companion to Psych Studies, Johnstone et al)

However, the severity of memory impairment is NOT related to the duration of illness or severity of neurological symptoms (Page 360, Kaplan & Sadock's Synopsis of Psych)

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:-[ :-[no kudos. Just making up for lost time. Superego Cafe is a brilliant idea,& typing the answers helps to reinforce what I've learned. fantastic idea to pool the questions based on topics. i've learnt so much today.

Hats offf to webmaster and santhana

:) :) :) :)

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Thanks DK and good work I can tell u as a veteran in these exams lol you will definitely get at leat few quations on EEG and nowadays rTMS and evoked potentials u have done the right thid by referring to sadock kapaln I think its a great book for ISQ reference happy preparing!!!!!

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10. Benzo's produce slowing of alpha waves on EEG with chronic use.

??FALSE: Acute doses produce slowin of alpha waves

Benzodiazepines cause changes in brain electroencephalographic (EEG) activity. In acute doses they produce a slowing of alpha activity and an increase in fast activity especially in the beta range (14-40 + Hz)(Fink 1969; Itil and Soldatos 1980). In addition they reduce the amplitude of cortical evoked potentials including the contingent negative variation (CNV) and auditory, visual and somatosensory evoked potentials (Saletu et al. 1972; Ashton et al. 1974,1976,1978) and prolong the latency of the auditory P300 potential (Shinotoh et al. 1989).

www.benzo.org

Have been trying to find the answers to the automatism questions....

4. re limited value of interictal EEG:

Interictal EEG can be normal, but can also show abnormality in frontal, temporal lobes which can help localise lesions. What do others think??

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4. An inter-ictal EEG in automatisms is of limited value

FALSE - Useful in diagnosing Schizophreniform psychosis in TLE, which is associated with inter-ictal seizure, rather than post-ictal as seen in mixed affective/schiz/confusion

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8. An abnormal gait is more suggestive of early Alzheimer’s disease than vascular dementia

False. In ICD-10, one of the criterias of VD is clinical evidence of focal brain damage which may be e.g a unilateral spastic weekness of the limb!

11. 5%of elderly schizophrenics have a family history of schizophrenia in the first degree relatives  

False. ''Genetically, patients with late paraphrenia occupy an intermediate position between the unaffected population and those with schizophrenia of earlier onset. In one study{Kay 1972}, the risk in first degree relatives was found to be 3.4% in late paraphrenics compared with 5.8% in young schizophrenics and less than 1% in the general population''

SHORTER OXFORD TEXTBOOK OF PSYCHIATRY P 633

12. Emotional lability in a patient with dementia indicates vascular dementia rather than AD  

True. Emotional incontinence addes one point to Hachiniski Ischemic score, which is, when more than 5 indicates vascular rather than degenerative.

13. Nocturnal enuresis present in all parts of sleep  

False. 'typically, disturbance occurs during the first 1/3 of the night, during the non-REM sleep'

EXAMINATION NOTES IN PSYCHIATRY PAGE 288

14.EEG has exaggerated spikes in Huntington's disease

False. it is flat.....just flat!

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nocturnal enuresis is seen in all parts of the sleep but more in REM sleep

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13- regarding nocturnal enuresis...

I have to agree with you Zonk that it can occur in any phase of sleep, but EXCEPT REM sleep

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1)true- syopsis

2)true - gaskell

6)true - gaskell

13)true- OTP

14)false synopsis

16)true- leeds notes

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inter-ictal eeg in automatism typically show 8hz and 14hz spikes

i think false because inter-ictal eeg is characterized by a slow background. hallmark of awake interictal eeg is diffuse slow spike and wave which are burst of irregular, general spikes sharp waves follow by 350 - 400ms slow wave.

frequencies of slow spike wave is 1.5 - 2.5 hz

check professionals/epilepsy.com

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4. An inter-ictal EEG in automatisms is of limited value  

Alokoye, I don't understand what you mean by 'inter-ictal seizure'.

I believe that inter-ictal EEG is of limited value in that a negative reading does not rule out the diagnosis.

(15% of healthy individuals have an abnormal EEG and 20% epileptics have a normal EEG, Core Psych Pg538)

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11. 5%of elderly schizophrenics have a family history of schizophrenia in the first degree relatives

Tom, after you wrote 'the risk in first degree relatives was found to be 3.4% in late paraphrenics compared with 5.8% in young schizophrenics', I'm wondering if the answer's true, as elderly schizophrenics include late paraphrenics and 'graduates' with early onset.

Whadya think?

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11. 5%of elderly schizophrenics have a family history of schizophrenia in the first degree relatives    

dear Nerd-Alert,

with regard to this q., I looked at Manchester course. It devides the risk of schizophrenia in first degree relatives into 3:

- Early onset(before 40): c. 10%

- late onset(after 40): c. 10%

- very late onset( after 60): no increased risk in first degree relatives

So, I think if elderly means more than 60, the unswer should still be false.

I hope this helps......but Why this question is under ISQS on EEG??

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