In EEG which type of waves are seen in metabolic encephalopathy

In EEG which type of waves are seen in
metabolic encephalopathy
a) Alpha
b) Beta
c) Gamma
d) Delta
Correct Answer - D
Answer- D. Delta
E.E.G. has been widely used to evaluate metabolic encephalopathy.
The E.E.G. findings are abnormal in acute encephalopathy stages
Metabolic
encephalopathy 'vthm
Grade I (almost
normal)
Dominant activity is rhythm with minima, theta
activity
Grade II (mildly
abnormal)
Dominant theta background with some alpha
and delta activities
Grade II
(morderately
abnormal)
Continuous delta activety predominates, little
activity of faster frequencies
Grade IV (severely
abnormal)
Low-amplitude delta activity or suppression-
burst pattern
Grade V (extremely
abnormal) Nearly “flat” tracing or electrocerebral inactivity