2022年6月13日 · (2) Some studies have found that LPDs correlated with glucose hypermetabolism seen on PET scans. LPDs >2 Hz have been associated with focal tissue hypoxemia. This may imply that LPDs could cause neuronal injury. (LaRoche 2018) causes of LPDs (usually focal pathology) Stroke. Ischemic stroke (the most common cause of LPDs overall).

2021年7月1日 · We propose LPDs with a periodicity greater than 1 Hz are associated with ictal or peri-ictal patterns, whereas a periodicity of 0.5 Hz or less is associated with interictal/irritative brain injury. Between 0.5 and 1 Hz, the plus modifier, the spatiotemporal evolution of the pattern can make the difference.

2022年10月5日 · The risk of seizures increases when the frequency of periodic discharges exceeds 2 Hz and when the pattern has features of superimposed rhythmic, sharp, or fast activity (plus modifier). Lateralized periodic discharges (LPDs) are one of the best examples of the IIC.

2020年7月8日 · LPDs are stereotyped, repetitive EEG discharges and recurr periodically at regular intervals at 0.5 to 3 Hz; they are broadly lateralized over one hemisphere, particularly over the parasagittal and temporal areas; LPDs are usually epileptiform in appearance; they appear like sharp waves/sharp waves complexes ranging from 50 to 300 uV in ...

In patients with traumatic brain injury (TBI), periodic patterns > 2 Hz produced metabolic crisis as increased lactate/pyruvate ratio (LPR) and decreased glucose levels in cerebral microdialysate akin to electrographic seizures 49.

a) A robust regular PLED waveform, whose spectrum d) shows a clear 2-peaked structure of a fundamental (at ~0.9 Hz) and its second harmonic (at ~1.8 Hz) along with a small third harmonic (~2.7 Hz). b) The waveform later in the illness becomes somewhat irregular with some reduction of sharp components.

2015年8月1日 · Generalized periodic diacharges or lateralized periodic discharges (GPDs/LPDs) with a frequency of less than 2.5 Hz or rhythmic discharges (RDs) faster than 0.5 Hz are the borderland of NCSE in coma. In these cases, at least one of the additional criteria is needed to diagnose NCSE (a) subtle clinical ictal phenomena, (b) typical spatiotemporal ...

2022年3月15日 · Lateralized periodic discharges (LPDs), formerly known as periodic lateralized epileptiform discharges (PLEDs) were first described by Chatrain et al. as periodic or quasi-periodic unilateral focal spikes or sharp waves, occurring at a rate of 1–2 Hz .

The frequency of LPDs is correlated with seizure risk [23]: LPDs of less than 1 Hz: 40% risk of seizures, LPDs of 2 Hz or greater: 66% risk of seizures. ... View in full-text Context 3

In a prospective study of 90 comatose adults with poor grade subarachnoid hemorrhage, periodic discharges identified at a frequency ≥ 2 Hz were associated with a 25% decrease in PbtO 2 5 to 10 minutes after their onset 27. Another adult study of nine patients with LPDs showed that seven of them had an acute brain injury.