What is the recommended workup and initial management for a 52‑year‑old man presenting with frequent neck paresthesia, a metallic (copper) taste, excessive sweating, and a single generalized tonic‑clonic seizure with jerking, eye rolling, foaming, and a post‑ictal state?

Immediate Workup and Management

This patient requires urgent neuroimaging with non-contrast CT head immediately, followed by MRI brain with epilepsy protocol, EEG, comprehensive metabolic panel including glucose and electrolytes, and cardiac evaluation to rule out structural lesions and identify the underlying cause of his focal autonomic seizures progressing to a generalized tonic-clonic seizure 1.

Clinical Reasoning

The constellation of neck paresthesias (tingling), metallic taste, and excessive sweating preceding a generalized tonic-clonic seizure strongly suggests focal autonomic seizures with secondary generalization. These autonomic symptoms are classic warning signs (auras) indicating focal onset from a specific brain region, most commonly temporal lobe 2. The progression to a witnessed generalized tonic-clonic seizure with characteristic features (jerking, eye rolling, foaming, post-ictal state) confirms this is a serious neurological event requiring comprehensive evaluation 1.

Immediate Diagnostic Workup

Neuroimaging (Priority #1)

• Non-contrast CT head: Perform immediately in the emergency setting to rapidly identify life-threatening structural pathology including intracranial hemorrhage, stroke, mass lesions, or hydrocephalus 1
• MRI brain with epilepsy protocol: Essential follow-up imaging (within 24-48 hours) as it is far more sensitive than CT for detecting epileptogenic lesions including tumors, vascular malformations, cortical dysplasia, and inflammatory processes 1
  • The combination of autonomic symptoms and new-onset seizure at age 52 raises concern for temporal lobe pathology, including glioblastoma, which can present exactly this way 2

Electroencephalography

• Standard EEG with sleep deprivation: Obtain within days of presentation to identify epileptiform discharges and help classify seizure type 1
• Consider 3-hour sleep-deprived video-EEG if standard EEG is non-diagnostic 3

Laboratory Evaluation

• Comprehensive metabolic panel: Check glucose, sodium, calcium, magnesium, and renal function
  • Hypocalcemia can present with seizures and must be excluded 4
• Complete blood count: Screen for infection or hematologic abnormalities
• Serum copper and ceruloplasmin levels: The metallic (copper) taste is an unusual symptom that warrants checking copper levels, though copper deficiency typically presents with polyneuropathy rather than seizures 5
• Toxicology screen: Rule out substance-induced seizure threshold lowering 6

Cardiac Evaluation

• 12-lead ECG: Essential to exclude cardiac arrhythmia as a cause of the syncopal-appearing event 7
• Consider cardiac monitoring if any suggestion of syncope versus seizure

Critical Differential Diagnoses to Consider

High-Priority Structural Lesions

1. Brain tumor (especially temporal lobe glioblastoma): The age (52), focal autonomic symptoms (sweating, metallic taste), and progression to generalized seizure fit this pattern perfectly 2
2. Vascular malformation or stroke: Can present with new-onset seizures 1
3. Infectious causes: Consider neurocysticercosis given the focal nature, even without recent travel history (latency can be decades) 8

Metabolic/Systemic Causes

• Hypoglycemia, hyponatremia, hypocalcemia (especially with parathyroid disorders) 4
• Medication effects or substance use lowering seizure threshold 6

Initial Management Decisions

Antiseizure Medication Initiation

Do NOT start antiseizure medication in the emergency department for a single unprovoked seizure unless there is evidence of an underlying structural lesion or high recurrence risk 9, 7. The decision to initiate treatment should be made after:

• Neuroimaging results are available
• EEG findings are reviewed
• Underlying etiology is identified

However, if imaging reveals a structural lesion (tumor, vascular malformation, etc.), immediate ASM initiation is warranted 1.

If Treatment Is Indicated

• First-line options include levetiracetam, valproic acid, or lamotrigine for focal seizures with secondary generalization
• The choice depends on the underlying etiology identified on workup 6

Common Pitfalls to Avoid

1. Dismissing the autonomic symptoms: Neck tingling, metallic taste, and sweating are NOT benign—they represent focal seizure activity and demand investigation for structural brain lesions 2

2. Assuming this is "just epilepsy": New-onset seizures at age 52 with focal autonomic features have a high likelihood of underlying structural pathology, particularly temporal lobe tumors 1, 2

3. Delaying MRI: While CT is appropriate emergently, MRI is essential and should not be postponed—it detects lesions CT misses 1

4. Starting ASM without workup: Treatment decisions depend critically on identifying the underlying cause first 9, 7

5. Missing cardiac causes: Always obtain ECG to exclude arrhythmia masquerading as seizure 7

Urgent Neurology Consultation

Refer to neurology urgently (within 24-48 hours) for interpretation of imaging and EEG, determination of seizure classification, and guidance on ASM initiation if indicated 1. If imaging reveals a mass lesion, neurosurgical consultation is also required 2.