What does 3 Hz spike-and-wave mean?
What does 3 Hz spike-and-wave mean?
The following patterns of interictal epileptiform discharges may be seen: 3 Hz and spike-wave: These are typical for absence seizures but can also occur in other types of generalized seizures. The waking background EEG activity is normal.
What is Polyspike and wave discharges?
Spikes, or more commonly sharp waves, are typically 200 milliseconds in duration and are followed by slow waves. Polyspike discharges are seen in those epilepsy variants with prominent myoclonic seizures or during non–rapid eye movement (REM) sleep.
What color is considered for epilepsy?
The colors give a nod to the organizational history (red) while also acknowledging the international adoption of purple as the representative color for epilepsy awareness.
When do you see PLEDs?
The EEG is especially valuable in the investigation of patients with known or suspected seizures. PLEDs are often caused or seen in acute ischemic stroke, tumors, hemorrhages or infection.
What is the equation for the speed of a wave?
Rearranging the equation yields a new equation of the form: Speed = Wavelength • Frequency. The above equation is known as the wave equation. It states the mathematical relationship between the speed (v) of a wave and its wavelength (λ) and frequency (f). Using the symbols v, λ, and f, the equation can be rewritten as. v = f • λ
What is spike height in frequency domain?
One ‘spike’ in frequency domain shows two characteristics of the signal: spike position = signal frequency, spike height = peak amplitude. Analog signals are best represented in the frequency domain.Analog signals are best represented in the frequency domain. Simple Analog Signals Simple Analog Signals17
How do you find frequency from wavelength and velocity?
Method 1 of 4: Frequency from Wavelength. Learn the formula. The formula for frequency, when given wavelength and the velocity of the wave, is written as: f = V / λ. In this formula, f represents frequency, V represents the velocity of the wave, and λ represents the wavelength of the wave.
How do you calculate frequency from time and frequency?
1. Learn the formula. Frequency and the time taken to finish a single wave oscillation are inversely proportional. As such, the formula for calculating frequency when given the time taken to complete a wave cycle is written as: f = 1 / T.
