In the first months of life, up to half a baby's sleep time can be REM sleep, but this proportion decreases to about a third by 1-2 years of age.
With spindles, vertex waves in stage I, and K complexes in stage II arise, and can be extremely prominent in children vertex waves, in particular, can be very sharp appearing and come in long runs, so don’t confuse them for B(I)RDs or seizures. Regarding sleep, by 2 months of age stage II sleep spindles develop initially they can be very prolonged (up to 15 seconds at a time), and can remain asynchronous till up to 2 years of age. These tracings have their sensitivities lowered from the standing 7uV/mm to between 10-20uV/mm for clarity as, generally, pediatric tracings are higher amplitude than adults. Below are a few examples of normal waking tracings at various time points for infants note the general trend, over time, of less delta and more theta, and a better formed anterior-posterior gradient. By 1 year of age, the expected PDR is 6 Hz. In drowsiness, though, the background is usually still very slow and high amplitude, with a lot of 1-2 Hz activity up to 200uV in amplitude, particularly early on in the first year of life. Early in this timeframe, there is significant amounts of delta activity, but as baby's approach one year of age theta frequencies become increasingly admixed. After this point, a PDR of 4-5 Hz arises by 6 months of age during wakefulness. The recording should be continuous and symmetric, but not particularly reactive to eye opening until 2-4 months. The first year of life on EEG is characterized a preponderance of slow, high amplitude delta activity.
0 kommentar(er)
