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Antiepileptics
Chapter 13 - Nsg. 118
Question | Answer |
---|---|
Brief episodes of abnormal electrical activity in the nerve cells of the brain | Seizures |
Involuntary spasmodic contractions of any or all voluntary muscles throughout the body | Convulsions |
Chronic, recurrent pattern of seizures | Epilepsy |
Two types of Epilepsy: | Primary = unknown cause & Secondary = distinct cause (trauma,infections) |
Classification of Epilepsy: | Partial (Simplex & Complex); Generalized; Unclassified; Status epilepticus (continuous seizures) |
Drugs that control & prevent seizures and lessen adverse effects of seizures are | Antiepileptic drugs (AEDs) |
Characteristics of AEDs | usualy lifelong therapy, and can be used in combination with other drugs |
Method of Action for AEDs | 1. Stabilize Neurons 2. decrease neuron hyperexcitability 3. decrease spread of excessive nerve impulses |
Indications for AEDs | Prevent & control seizure activity, Long-Term maintenance for chronic seizures, acute treatment of convulsitons & status epilepticus |
Phenytoin (Dilantin) - most commonly used for tonic-clonic | Adverse Effects: lethargy, abnormal movements mental confusion, cognitive changes. Therapeutic Level: 10-20mcg/mL Contraindications: Exaggerated effectsif low serum albumin; very irritating to veins so give slowly (<50mg/min and follow with NS) |
Fosphenytoin (Cerebyx) give 1.5 of this inplace of 1.0 of phenytoin | This drug alleviates teh buring during injections. Give at a rate of 150mg PE/min to avoid hypotension & cardiorespiratory depression . Only give with 0.9%NaCl or D5W. |
Valproic Acid (Depakote) | Adverse Effects: Drowsiness, NV, tremors, weight gain, hepatotoxicity & pancreatitis; Interactions: carbonated beverages or milk |
Carbamazepine (Tegretol) most commonly prescribed | Therapeutic level 4-12mcg/mL; undergoes autoinduction: Interactions: Grapefruit increases toxicity. Can be given with food to reduce GI distress. |
Gabapentin (Neurontin) | (blank) |
Clonazepam (Klonipin) | causes hallucinations Indications: Lennox-Gastaut |
IM injections of these should not be used in any patient | barbiturates or phenytoin |
Levetiracetam (Keppra) | Most common adverse effects are: somnolence, asthenia(thin), and dizziness |