Page 54 - Physiology and Pathophysiology MNU 2024-2025 نظرى

Clinical pharmacy 2024/2025 Level 2 Pharm D Physiology and Pathophysiology (MD303)

Less Common Waves
Kappa Waves Lambda Waves
frequency: 10Hz – amplitude: 20-50µV -last 250 milliseconds,
Occurred in 30% of subjects while thinking – related to response of shifting visual image triangular in shape
NB

Higher frequencies: active processingalert wakefulness, dream sleep. Lower frequencies: nondreaming sleep, coma.

Why is an EEG carried out??

1) Epilepsy 2) Patients in a coma Other conditions
 Help to diagnose the  Help to determine whether the brain 3) Vertigo. ةخود

type of damage is reversible (can be treated),
4) head injury
epilepsyprescribing the or not (so severe).
5) Dementia =mental retardation هتع

most effective type of  This can help in deciding whether

medication. someone should be kept alive by 6) brain tumor مارو
 Help to identify the using a life-support machine. 7) brain abscess (collection of infected fluid on the brain) جارخ

 If an EEG shows that a person is brain
specific area of damaged
dead a life-support machine will ديدص ىلع ى وتحي
brain tissue  can be
not be able to improve that person's

removed by surgery. 8) encephalitis (inflammation of the brain) باهتلا
condition. جاوما هنم علطتب هسل فوشن ناشع

صلاخ لاو ةبوبيغلا 9) brain hemorrhage (bleeding in the brain) فيزن
10) cerebral infarct (brain tissue that has died because of blocked
blood flow)
11) sleep disorders

MEG (Magnetic Encephalography)
 Measures changes in magnetic fields that accompany electrical activity. ➔Same uses as EEG. But different technique principle, different

instrument

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