Seizures and Lactic Acidosis
Seizures can cause transient lactic acidosis (postictal hyperlactatemia) due to increased glycolysis during intense muscle activity, physiologic stress, and possible transient tissue hypoperfusion. [1] Severe postictal lactic acidosis has been reported during emergency evaluation after generalized seizures, with normalization of lactate and pH within 1 to 2 hours in reported cases. [1] Persistent or recurrent hyperlactatemia after seizure activity should prompt evaluation for an alternative or additional cause beyond the seizure. [1]
Postictal Lactic Acidosis Pattern
Hyperlactatemia in the postictal period is often self-limited. [1] Repeat arterial blood sampling after a short interval has demonstrated normalization in most postictal cases reported in clinical literature. [1]
Seizure Severity and Clinical Context
Marked lactic acidosis has been described after generalized seizures in emergency settings where other immediate causes were not identified at presentation. [1] In prolonged convulsive status epilepticus, lactate elevation may also coexist with complications from treatment and systemic illness. [2]
When to Suspect Another Cause
Ongoing lactic acidosis after the postictal period warrants assessment for causes such as ongoing hypoperfusion, infection, medication-related adverse effects, or tissue ischemia. [1] In refractory status epilepticus treated with anesthetic agents, elevated lactate has been reported in association with serious complications such as bowel ischemia. [2]
Clinical Implication for Management
Laboratory confirmation of acid-base status and lactate should be paired with clinical reassessment for alternate etiologies when lactic acidosis persists. [1] Repeat lactate measurement after an interval is reasonable to distinguish self-limited postictal hyperlactatemia from persistent metabolic derangements. [1]