Name That Event
An 8-year-old boy's teacher reports that dozens of times per day, he abruptly stops speaking and stares for several seconds. Immediately afterward, he resumes what he was doing without confusion. His neurologic examination is normal.
Which seizure type best explains these episodes, and which feature most strongly distinguishes them from focal seizures associated with impaired awareness?
What are absence seizures, characterized by brief duration and an immediate return to baseline without postictal confusion?
A 20-year-old is standing in a crowded, hot room when he develops lightheadedness and nausea. He loses consciousness and falls to the floor. Witnesses describe several brief jerking movements. Within seconds, he is awake, oriented, and asking what happened.
What is the most likely diagnosis?
What is syncope with convulsive movements?
A 58-year-old with diabetes has a witnessed generalized tonic-clonic seizure. Point-of-care glucose obtained immediately afterward is 38 mg/dL. Following IV dextrose, his mental status rapidly returns to baseline. Neurologic examination is normal, and he has no previous seizure history.
How should this event be conceptualized: epilepsy, a seizure mimic, or an acute provoked seizure?
What is an acute provoked seizure due to hypoglycemia?
A 42-year-old suddenly develops rhythmic jerking of the right hand that progressively spreads to involve the right arm. He remains fully aware and is able to answer questions throughout the episode. The movements stop after approximately 90 seconds. For the next 20 minutes, he has weakness of the right arm that gradually resolves.
How should the seizure be classified, and what does the transient weakness following the event represent?
What is a focal aware motor seizure followed by Todd's paralysis?
A 19-year-old suddenly loses consciousness while playing basketball. Witnesses report stiffening followed by several brief jerking movements. He regains consciousness rapidly and is oriented shortly afterward. His father died suddenly at age 34.
What diagnosis should be most strongly considered as the cause of this episode?
What is arrhythmic/cardiac syncope?
A 72-year-old woman taking hydrochlorothiazide presents after her first generalized tonic-clonic seizure. Her family reports several days of headache, nausea, lethargy, and increasing confusion.
Laboratory testing demonstrates Na⁺ 116 mEq/L. MRI shows no acute structural lesion.
Which finding most strongly determines how this seizure should be classified, and what is that classification?
What is the severe acute hyponatremia, making this an acute provoked seizure due to a metabolic derangement?
A 31-year-old has recurrent stereotyped episodes beginning with a rising epigastric sensation, followed by behavioral arrest and picking at his clothing. On two occasions, the episode progressed to bilateral stiffening and rhythmic jerking.
A classmate argues that because the patient has experienced bilateral tonic-clonic convulsions, he must have generalized epilepsy.
How should his epilepsy be classified, and why?
What is focal epilepsy, because the stereotyped focal aura and impaired-awareness seizure precede the bilateral tonic-clonic activity?
A 26-year-old has recurrent episodes beginning with déjà vu followed by behavioral arrest and lip-smacking for approximately 1 minute. His partner reports that he is unresponsive during the episodes. He remains confused for 15–20 minutes afterward. Neurologic examination is normal, and routine EEG between episodes shows no epileptiform abnormalities.
Are these episodes more consistent with epileptic or non-epileptic events, and what findings most strongly support your conclusion?
What is epileptic - focal impaired-awareness seizures?
A 19-year-old college student presents with fever, severe headache, photophobia, nuchal rigidity, and progressive confusion. Several hours later, he develops a generalized tonic-clonic seizure. His roommate reports no prior episodes suggestive of seizures.
How should the seizure be interpreted in the context of the patient's broader neurologic presentation, and what underlying process should be prioritized?
What is an acute provoked seizure secondary to a CNS infectious process, with the presentation concerning for acute meningitis?
A 29-year-old has recurrent stereotyped episodes beginning with nausea and a rising epigastric sensation. This is followed by impaired awareness, swallowing movements, and lip-smacking. During some episodes, one upper extremity develops sustained abnormal posturing. MRI demonstrates unilateral hippocampal atrophy with abnormal signal.
Which seizure focus best explains the combination of the patient's aura, automatisms, and MRI abnormality?
What is mesial temporal lobe epilepsy?
A 32-year-old suddenly loses consciousness at work. A coworker reports stiffening followed by bilateral jerking for approximately 20 seconds. He bit his tongue but did not have urinary incontinence. He is initially tired but is answering questions appropriately within 2 minutes. He recalls feeling lightheaded immediately before collapsing.
Which elements of this history are most useful in distinguishing seizure from syncope, and which diagnosis is better supported by the overall sequence of events?
What is syncope, with the presyncopal lightheadedness and rapid recovery carrying greater diagnostic weight than the presence of brief convulsive movements alone?
A previously healthy 24-year-old develops fever and headache, followed over 48 hours by increasingly bizarre behavior, confusion, and difficulty forming new memories. He then experiences behavioral arrest and lip-smacking followed by bilateral tonic-clonic movements.
MRI demonstrates abnormalities predominantly involving the temporal lobe.
A classmate suggests that the temporal-lobe semiology and imaging establish newly presenting mesial temporal lobe epilepsy.
What alternative diagnosis better explains the entire presentation, and how should the seizure be conceptualized?
What is HSV encephalitis causing an acute provoked focal seizure with progression to bilateral tonic-clonic activity?