Focal Delta Activity Causes & Reasons

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Focal Delta Activity Symptom Checker: Possible causes include Brain Concussion. Check the full list of possible causes and conditions now! Talk to our Chatbot to narrow down your search.

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Possible Causes

Brain Concussion

A brain concussion is a still incompletely defined syndrome of traumatic brain injury (TBI) that causes a spectrum of symptoms without evident structural damage to the brain. A headache, cognitive deficits, emotional instability, sleep disturbances, and an overall change in mental state after trauma are highly[…] [symptoma.com]

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Traumatic Brain Injury

Abstract In this study, we report on a patient who developed apathy resulting from injury to the prefrontocaudate tract following mild traumatic brain injury (TBI), which was observed on diffusion tensor tractography (DTT). A 46-year-old female patient was involved in a bus accident. Her history included[…] [ncbi.nlm.nih.gov]

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Meningioma

BACKGROUND: Intracranial schwannomas most commonly arise from the vestibulocochlear nerve and less frequently from trigeminal, facial, and hypoglossal nerves. Intracranial schwannomas unrelated to cranial nerves are very rare; only approximately 50 cases have been reported in the literature. Tentorial schwannoma[…] [ncbi.nlm.nih.gov]

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Brain Neoplasm

RATIONALE AND OBJECTIVES: To compare differences in diffusion tensor imaging (DTI) and dynamic susceptibility-weighted contrast-enhanced (DSC) magnetic resonance (MR) perfusion imaging characteristics of recurrent neoplasm and radiation necrosis in patients with brain tumors previously treated with radiotherapy[…] [ncbi.nlm.nih.gov]

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Encephalitis

BACKGROUND: Autoimmune-mediated processes are the driving force behind many neurological diseases. Autoimmune encephalitis, a group of syndromes, mediated by or at least associated with autoantibodies against neuronal tissue, have gained increasing importance especially in paediatric neurology. Since the first NMDAR[…] [ncbi.nlm.nih.gov]

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Stroke

In some cases, focal slow activity may presents as focal and irregular slow activity in the delta frequency, receiving the designation of polymorphic delta activity (PDA) [scielo.br]

Thalamic lesions generally produced focal or unilateral delta activity, but the slow activity varied in time of onset, amplitude and degree of focality 16. [scielo.br]

It was first described by Walter 14, in 1936, who proposed the term "delta waves" for focal slow activity associated with tumors involving cerebral hemispheres. [scielo.br]

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Preeclampsia

The pattern is usually a diffuse slowing of activity (theta or delta waves), sometimes with focal slow activity and occasional paroxysmal spike activity. [health.am]

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Temporal Lobe Epilepsy

activity and temporal lobe-onset seizures. [ncbi.nlm.nih.gov]

The monomorphic slow waves are without clinical correlate and must be differentiated from the polymorphic delta activity that would be seen with a focal lesion over the temporal [hindawi.com]

In this rare case of coexistent primary generalised epilepsy and focal epilepsy, the epileptic networks of the two forms of epilepsy appear to overlap. [ncbi.nlm.nih.gov]

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Rasmussen Syndrome

Focal delta activity without epileptiform spikes may preceed the onset of epilepsia partialis continua by several months. [pediatricneurologybriefs.com]

Figure 1: A-Electroencephalogram- Slow-wave activity- delta waves in the right cerebral hemisphere, B and C- RNM-FLAIR Coronal / T2 Axial- Cortical-subcortical atrophy of [smjournals.com]

However, from an initially normal EEG, persistent high amplitude delta activity can develop over the affected hemisphere within months of seizure onset. [ncbi.nlm.nih.gov]

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Uncinate Seizure

focal fast activity like our case. [j-epilepsy.org]

[…] in almost 50%; in the majority of those that do show abnormalities, focal attenuation or rhythmic theta or delta is the prominent rhythm, and 10% of the abnormalities are [j-epilepsy.org]

[…] brief events in one night, usually in the space of a few hours. 10 Video-EEG recordings of NFLE show striking stereotypy between attacks. 7 Ictal EEG shows no epileptiform activity [j-epilepsy.org]

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Cellulitis

Testing for patient responsiveness and improvement in EEG; increases in EEG reactivity and appearance of EEG background activity. 3) Above, with discharges 2.5/sec with focal [liveto.com]

[…] ictal phenomena (e.g. facial twitching, gaze deviation, nystagmus, limb myoclonus). 4) Rhythmic waves (theta-delta) at 0.5 Hz with a) incrementing onset (increase in voltage [liveto.com]

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Juvenile Myoclonic Epilepsy

activity and temporal lobe-onset seizures. [ncbi.nlm.nih.gov]

In this rare case of coexistent primary generalised epilepsy and focal epilepsy, the epileptic networks of the two forms of epilepsy appear to overlap. [ncbi.nlm.nih.gov]

[…] myoclonic epilepsy, to the novel appearance of interictal temporal spikes immediately preceding bisynchronous discharges, and subsequently to temporal intermittent rhythmic delta [ncbi.nlm.nih.gov]

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Generalized Motor Seizure

delta waves or attenuation (27%), spikes (27%) or attenuation (9%) in tonic seizures; rhythmic beta activity (66%) or rhythmic theta-alpha activity (33%) in focal tonic-clonic [scielo.br]

GTC seizures associated with encephalopathic generalized epilepsy (EGE) have slow background activity, voltage asymmetries, and intermixed focal or generalized theta and delta [neupsykey.com]

Ictal EEG in focal seizures consisted of spikes (66%) or rhythmic theta-alpha activity (33%) in tonic-clonic seizures with secondary generalization; rhythmic spikes (73%), [scielo.br]

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Subdural Hematoma

[…] ratio, has been shown to be a sensitive marker of focal brain ischemia.10 In our patient, at baseline on day 1, there was decreased fast activity and mild to moderate slowing [ahajournals.org]

Using qEEG, the alpha/delta ratio was found to be reduced. This ratio significantly worsened after the syncopal event on day 2. [ahajournals.org]

Decreased percentage of faster frequency bands (alpha and beta) coupled with increased percentage of slower frequency bands (delta and theta), that is a reduced alpha/delta [ahajournals.org]

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Generalized Clonic or Tonic-Clonic Seizures

delta waves or attenuation (27%), spikes (27%) or attenuation (9%) in tonic seizures; rhythmic beta activity (66%) or rhythmic theta-alpha activity (33%) in focal tonic-clonic [scielo.br]

Ictal EEG in focal seizures consisted of spikes (66%) or rhythmic theta-alpha activity (33%) in tonic-clonic seizures with secondary generalization; rhythmic spikes (73%), [scielo.br]

[…] low voltage fast activity (9%), attenuation (9%) or rhythmic delta (9%) in clonic seizures; low voltage fast activity (36%), rhythmic theta-alpha activity with or without [scielo.br]

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Benign Familial Infantile Epilepsy Type 4

With decreasing seizure frequency after 4 months of age, the EEG evolved into generalized slow delta activity and only occasional spikes (18 weeks); after 6 months of age [karger.com]

[…] the EEG showed low voltage undifferentiated activity with frequent ictal pattern and occasional focal spikes and sharp waves. [karger.com]

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Familial Infantile Myoclonic Epilepsy

With decreasing seizure frequency after 4 months of age, the EEG evolved into generalized slow delta activity and only occasional spikes (18 weeks); after 6 months of age [karger.com]

[…] the EEG showed low voltage undifferentiated activity with frequent ictal pattern and occasional focal spikes and sharp waves. [karger.com]

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Temporal Lobe Tumor

[…] broad sharp delta activity over the area of the tumor. [karger.com]

Slow wave activity Focal delta (EEG frequency 4 Hz) activity is the classic electrographic sign of a local disturbance in cerebral function; however, if the lesion is small [emedicine.medscape.com]

This rhythmic activity contrasts with the usual arrhythmic slowing seen focally with brain tumor and may conceivably be related to the rhythmic slowing associated with seizure [karger.com]

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Versive Seizure

Ictal EEG shows rhythmic theta or delta activity with intermixed spikes that start posteriorly. [statpearls.com]

The seizure frequently lasts longer than 30 minutes, and about one-third of patients may develop focal status epilepticus. [statpearls.com]

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Partial Pyloric Obstruction

Testing for patient responsiveness and improvement in EEG; increases in EEG reactivity and appearance of EEG background activity. 3) Above, with discharges 2.5/sec with focal [liveto.com]

[…] ictal phenomena (e.g. facial twitching, gaze deviation, nystagmus, limb myoclonus). 4) Rhythmic waves (theta-delta) at 0.5 Hz with a) incrementing onset (increase in voltage [liveto.com]

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Meningoencephalitis

[…] or theta frequencies and focal sharp-wave activity. 14 Pathological findings of von Economo disease typically consist of a nonhemorrhagic involvement of the gray matter, [jamanetwork.com]

[…] invariably normal, but oligoclonal band positivity has been reported. 21 An EEG during the acute phase of the illness often shows diffuse unilateral or bilateral slowing in the delta [jamanetwork.com]

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Stupor

EEGs in the former may show focal disturbances such as delta and theta activity, epileptiform abnormalities, and attenuation of faster frequencies. [ncbi.nlm.nih.gov]

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Focal Motor Seizure

Ictal EEG shows rhythmic theta or delta activity with intermixed spikes that start posteriorly. [ncbi.nlm.nih.gov]

The seizure frequently lasts longer than 30 minutes, and about one-third of patients may develop focal status epilepticus. [ncbi.nlm.nih.gov]

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Jacksonian Seizure

Ictal EEG shows rhythmic theta or delta activity with intermixed spikes that start posteriorly. [ncbi.nlm.nih.gov]

The seizure frequently lasts longer than 30 minutes, and about one-third of patients may develop focal status epilepticus. [ncbi.nlm.nih.gov]

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Idiopathic Generalized Epilepsy

Other characteristic EEG features include polyspikes, polyspike-wave discharges, occipital intermittent rhythmic delta activity, and photoparoxysmal response. [ncbi.nlm.nih.gov]

The EEG signature of IGE is bisynchronous, symmetric, and generalized spike-wave complex; although focal, irregular, and so called "fragments" of discharges are not uncommon [ncbi.nlm.nih.gov]

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Early Infantile Epileptic Encephalopathy Type 6

delta waves or attenuation (27%), spikes (27%) or attenuation (9%) in tonic seizures; rhythmic beta activity (66%) or rhythmic theta-alpha activity (33%) in focal tonic-clonic [psiquiatriainfantil.com.br]

Ictal EEG in focal seizures consisted of spikes (66%) or rhythmic theta-alpha activity (33%) in tonic-clonic seizures with secondary generalization; rhythmic spikes (73%), [psiquiatriainfantil.com.br]

[…] low voltage fast activity (9%), attenuation (9%) or rhythmic delta (9%) in clonic seizures; low voltage fast activity (36%), rhythmic theta-alpha activity with or without [psiquiatriainfantil.com.br]

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Metabolic Encephalopathy

[…] and delta), presence of particular EEG patterns (focal or generalized), intermittent activity suppression, or an electrocortical silence. [35], [36] In the patients with [neurologyindia.com]

[…] lesions; seizure activity; EEG of metabolic encephalopathy is liable to have diffuse slowing in the delta-theta frequencies, while degenerative disease may cause little [dartmouth.edu]

delta/theta activity, as well as focal paroxysms of sharp waves and spike-waves during hyperventilation (HV). [38] In patients with cirrhosis, in addition to diffuse slow [neurologyindia.com]

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Autoimmune Encephalopathy

[…] slowing (30 %); seizure activity has been reported in 24–60 % of the patients. 34,40 A highly characteristic pattern described as “extreme delta brush”, occurs in 30 % of [touchneurology.com]

[…] or diffuse slow or disorganised activity, epileptic activity, or extreme delta brush) CSF with pleocytosis or oligoclonal bands Reasonable exclusion of other disorders [ncbi.nlm.nih.gov]

[…] course of the disease the prevalence of oligoclonal bands increases. 29,39 The electroencephalograph (EEG) of these patients usually shows generalised diffuse (90 %) or focal [touchneurology.com]

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Postictal State

However, the same study found that patients who appeared “confused” were much more likely to have either bisynchronous spike-and-slow-wave discharges or diffuse delta activity [ncbi.nlm.nih.gov]

[…] lesions; seizure activity; EEG of metabolic encephalopathy is liable to have diffuse slowing in the delta-theta frequencies, while degenerative disease may cause little [dartmouth.edu]

[…] than focal discharges [14]. [ncbi.nlm.nih.gov]

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Encephalopathy

[…] and delta), presence of particular EEG patterns (focal or generalized), intermittent activity suppression, or an electrocortical silence.[35],[36] In the patients with hypoglycemia [neurologyindia.com]

[…] lesions; seizure activity; EEG of metabolic encephalopathy is liable to have diffuse slowing in the delta-theta frequencies, while degenerative disease may cause little [dartmouth.edu]

/theta activity, as well as focal paroxysms of sharp waves and spike-waves during hyperventilation (HV).[38] In patients with cirrhosis, in addition to diffuse slow activity [neurologyindia.com]

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