Seizures Flashcards
What is a seizure?
A single, self-limiting occurrence of ‘jerky’ movements.
Seizures can vary in duration and intensity.
What defines epilepsy?
Two or more unprovoked and continuous/contiguous seizures.
Epilepsy often requires long-term management.
Does a seizure require treatment with anti-epileptic medications or surgery?
No- it requires monitoring for safety.
Seizures may resolve on their own without intervention.
Are anti-epileptic medications necessary for epilepsy?
Yes, they are necessary and life-saving measures are required.
(its in the name)
Surgery may be an option in certain cases.
What type of seizure is limited to one hemisphere of the brain?
Focal seizure
Focal seizures are limited to one hemisphere of the brain.
What type of SEIZURE occurs and engages bilaterally?
Generalized seizure
Generalized seizures involve both hemispheres of the brain.
What is the classification of seizures that involves epilepsy spasms?
Unknown seizures
Unknown seizures are characterized by epilepsy spasms and lack sufficient data for classification.
Fill in the blank: Seizures that are related to an acute, reversible condition (identifiable trigger) are classified as _______.
Provoked or acquired
Provoked seizures occur as the result of trauma, low blood sugar (hypoglycemia), low blood sodium, high fever, or alcohol or drug abuse.
Specific causes of “Acquired” Seizures
- Cerebrovascular disease
- Hypoxia – poor tissue O2, Hypoxemia – low SaO2
- Eclampsia - pregnancy high BP
- Fever (childhood) – “convulsion”
- Head injury / TBI – up to 5 of 10 w/ TBI
- Hypertension – 2.5 fold increase risk in elderly
- Central nervous system infections
- Metabolic and toxic conditions – (hyponatremia)
- Brain tumor – frontal, parietal, temporal
- Drug and alcohol withdrawal
- Allergies – kids w/ allergic rhinitis = 76% higher risk
What condition can cause seizures during pregnancy?
Eclampsia
Eclampsia is a severe complication of pregnancy characterized by seizures.
Q: How does eclampsia cause seizures?
A: Eclampsia is a pregnancy complication involving severe hypertension, proteinuria, and seizures due to brain edema and ischemia.
Q: Why do childhood fevers sometimes cause seizures?
A: High fevers in young children can trigger febrile seizures, also known as convulsions, due to increased neuronal excitability.
Febrile: related to fever
Q: What is the relationship between traumatic brain (head) injury (TBI) and seizures?
Traumatic brain injuries (TBI) can cause seizures, with up to 50% of patients developing post-traumatic epilepsy.
This statistic highlights the significant risk associated with TBI.
Q: How can central nervous system (CNS) infections lead to seizures?
A: Infections like meningitis, encephalitis, and brain abscesses cause inflammation, fever, and direct brain damage, triggering seizures.
Infections like meningitis or encephalitis can trigger seizures.
Q: What metabolic and toxic conditions can cause seizures?
A: Electrolyte imbalances, such as hyponatremia, along with renal failure, hepatic encephalopathy, and toxin exposure, can provoke seizures.
Low sodium levels can lead to seizures among other symptoms.
Which brain tumors are commonly associated with seizures?
Frontal, parietal, temporal
These regions of the brain are often implicated in seizure activity.
Q: Why can drug and alcohol withdrawal cause seizures?
A: Abrupt cessation of alcohol, benzodiazepines, or other depressants can cause hyperexcitability in the brain, leading to withdrawal seizures.
Withdrawal from substances can trigger seizures in some individuals.
Q: How do allergies increase seizure risk in children?
A: Children with allergic rhinitis have a 76% higher risk of seizures due to inflammatory and immune system effects on the brain.
Allergies can be a contributing factor to seizure risk in children.
What can cause Seizures in Newbornn and Infants
- Severe hypoxia
- Genetic metabolic defects
- Congenital defects involving the CNS
- Alcohol or barbiturate withdrawal
- Birth trauma
- Infections
- Metabolic disorders: hypoglycemia, hypocalcemia, vitamin B6 deficiency
What characterizes generalized seizures?
- Involves both hemispheres, often causing loss of consciousness (seconds to minutes)
Generalized seizures affect both sides of the brain simultaneously.
What are the 2 main types of generalized seizures?
- Motor (tonic-clonic)
- Absence seizures
These classifications help in understanding the different manifestations of seizures.
What are 5 symptoms of motor (tonic-clonic) seizures?
- Muscle stiffness
- Rhythmic jerking
- May result in loss of consciousness
- Falls
- Vocalization
Tonic-clonic seizures can involve both phases: tonic (stiffening) and clonic (jerking).
What are absence seizures characterized by?
Brief <15 seconds but can lasts up to 30 secs.
Episodes of brief disturbance of brain function
Absence seizures are also known as petit mal seizures.
What are common symptoms of absence seizures?
- Blank stare - lasting 15-30 secs
- Sudden stop in activity
- Lip smacking
- Eyelid fluttering
- Small hand movements
- No memory of the event
These symptoms can occur without the individual being aware of the seizure.