Management of Status Epilepticus

Definition and Treatment

Status epilepticus requires immediate treatment with benzodiazepines as first-line therapy, followed by intravenous phenytoin, fosphenytoin, or valproate as second-line agents if seizures persist, and escalation to levetiracetam, propofol, or barbiturates for refractory cases 1, 2, 3
Status epilepticus is a life-threatening neurological emergency characterized by prolonged seizure activity, recurrent seizures without full recovery of consciousness between episodes, and mortality rates of 5-22%, increasing to 65% in refractory cases 4, 5

The American College of Emergency Physicians recommends administering one of the following as second-line treatment (Level B recommendation): phenytoin, fosphenytoin, or valproate 1, 2, 6
Phenytoin should be administered at 18-20 mg/kg IV at 50 mg/min 6
Fosphenytoin should be administered at 18-20 mg/kg PE (phenytoin equivalents) IV at 150 mg/min 6
Valproate should be administered at 30 mg/kg IV at 6 mg/kg/hour 6
For refractory status epilepticus, levetiracetam, propofol, or barbiturates may be used (Level C recommendation) 3, 6
Levetiracetam should be administered at 30 mg/kg IV at 5 mg/kg/min 6
Propofol should be administered at 1-2 mg/kg IV bolus, followed by 2-10 mg/kg/hour infusion 6
Barbiturates, such as phenobarbital, should be administered at 20 mg/kg IV at 50-100 mg/min 6

The American College of Emergency Physicians recommends identifying and correcting precipitating factors, including hypoglycemia, hyponatremia, hypoxia, CNS infection, stroke or hemorrhage 2, 3, 5
Phenytoin/fosphenytoin can cause hypotension (12% of cases) versus valproate (0%) 2
Valproate has shown efficacy rates of 68-88% in refractory status epilepticus 2, 6
Levetiracetam demonstrated efficacy rates of 67-73% in various studies 6
Phenytoin/fosphenytoin showed 56-84% efficacy in terminating status epilepticus 2, 6

Status epilepticus is defined as a seizure lasting longer than 5 minutes or multiple seizures without a return to neurologic baseline, according to the American College of Emergency Physicians 7

EEG monitoring is crucial for detecting nonconvulsive status epilepticus, especially in patients with persistent altered consciousness, as recommended by the American College of Emergency Physicians 8
Consider emergent EEG in patients suspected of being in nonconvulsive status epilepticus, those who have received long-acting paralytics, or patients in drug-induced coma, as suggested by the American College of Emergency Physicians 8

The traditional definition of status epilepticus represents the timepoint when long-term neuronal injury becomes likely, but waiting this long to diagnose and treat significantly worsens outcomes, according to the American College of Emergency Physicians 9
Intermittent seizures without full recovery of consciousness between episodes also constitutes status epilepticus, regardless of individual seizure duration, as stated by the American College of Emergency Physicians 9

Non-convulsive status epilepticus cannot be diagnosed by clinical observation alone and requires EEG confirmation, as recommended by the Infectious Diseases Society of America 10
Non-convulsive status epilepticus is found in up to 8% of comatose patients without clinical seizure activity, according to the Infectious Diseases Society of America 10

Observe for subtle motor seizures, such as mouth twitching, digit movements, eyelid twitching, as suggested by the Infectious Diseases Society of America 10
Look for evidence of prior seizures, including tongue biting, injuries, incontinence, as recommended by the Infectious Diseases Society of America 10
Focus on specific high-yield elements in history gathering, including medication history, acute precipitants, metabolic risk factors, and substance use, as stated by the American College of Emergency Physicians 9

Point-of-care glucose measurement is mandatory in all patients to identify correctable causes of status epilepticus, such as hypoglycemia, as recommended by the American College of Emergency Physicians 9
Hypoglycemia is a correctable cause that must be identified immediately, and even in patients with normal mental status post-seizure, unsuspected hypoglycemia occurs in approximately 1-2% of cases, according to the American College of Emergency Physicians 9
Order first-line laboratory studies based on clinical presentation, including serum sodium, complete metabolic panel, AED levels, and toxicology screen, as suggested by the American College of Emergency Physicians 9

Obtain emergent neuroimaging in specific scenarios, including first-time seizure patients, patients with focal neurological deficits, persistent altered mental status, fever with concern for CNS infection, head trauma history, known or suspected malignancy, and anticoagulation use, as recommended by the American College of Radiology 11