Polymorphic (No-rhythmic delta)
Rhythmic delta
Rhythmic delta with fluctuation = IIC
“Alternating” in frequency /morphology (novel-Not only
amplitude) /location
( e.g. alternating frequency between 1 Hz 1.5 Hz 1 Hz) → →
and each of change last at least 3 cycles but does not last < the
60s
Electrographic seizure (RDA evolution)
“Progressing” in frequency /morphology (novel-Not only
amplitude) /location ( e.g. consecutive increasing frequency 1
Hz 1.5 Hz 2 Hz) and The evolving each at least 3 cycles and → →
NOT stay the same for 5 minutes or more.
To be qualified rhythmic -the majority of the
cycle pair duration should not vary (i.e. >50%)
from each other