神经系统药理-魏尔清-抗癫痫药.ppt

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1、Part 9Antiepileptic and Anticonvulsant Drugs,Psychomotor seizures,Petit mal(absence),Grand mal(tonic-clonic),Epilepsy is not a single entity;it is a family of different recurrent seizure disorders that have in common the sudden,excessive and disorderly discharge of central neurons.This results in ab

2、normal movement or perceptions that are of short duration but that tend to recur.,Classification of epilepsy(older),Generalized seizures(全身发作）Grand mal（大发作）：tonic-clonic seizures（强直阵挛）Petit mal（小发作）：absence seizures（失神发作）Partial seizures(部分性发作)Pshychomotor（精神运动性）：temporal lobe seizures（颞叶癫痫）Partial（

3、部分发作）：motor,sensory,ANS,etc.（局限性发作）,Classification of epilepsy,Normal EEG,Absence EEG,The pathways for seizure propagation in partial seizures and primary generalized seizures,Stereotypical complex partial seizures,Mechanisms of antiepileptic drugs,ElectrophysiologicalInhibiting excessive discharges

4、Inhibiting spread of dischargesMolecularPotentiating GABA neuronal functionsModulating Na+,Ca2+,K+channel fuctions,A.Antiepileptic drugs,Special drugs,Phenytoin Sodium 苯妥英钠,1.Pharmacological effects and the mechanism Inhibiting influx of Na+and Ca2+Inhibiting spread of abnormal discharges,A.Antiepil

5、eptic drugs,2.Clinical uses(1)AntiepilepsyGrand mal,status epilepticus;Partial seizures(simple and complex);Ineffective for petit mal(absence seizures)(2)Trigeminal and related neuralgia(3)Antiarrhythmia,A.Antiepileptic drugs,3.ADME Larger doses:non-linear kinetics（plasma concentration 10 g/ml）Neces

6、sary to monitor plasma concentrations Induction of hepatic drug-metabolizing enzymes,A.Antiepileptic drugs,3.Adverse effects(1)Local reactionsGI reactions;gingival hyperplasia(2)CNS reactionsParticularly in the cerebellum and vestibular systems:nystagmus(眼球震颤),ataxia(共济失调),etc.Behavioral changes:con

7、fusion,hallucination,A.Antiepileptic drugs,(3)Hemological reactionsMegaloblastic anemia(4)Allergic reactionsSkin reactions;blood cell abnormality(including thrombocytopenia,agranulocytosis);hepatic toxicity;ect.(5)Skeletal reactionsOsteomalacia by abnormal vitamin D metabolism and calcium absorption

8、,A.Antiepileptic drugs,4.Drug interactions(1)Increases plasma concentrations of drugs by displacement of plasma protein binding(salicylates)and inhibition of inactivation(isoniazid,chloramphenicol)(2)Decreases plasma concentrations of drugs(phenobarbital,carbamazepine)by enhancing metabolism(3)Pheny

9、toin enhances the metabolism of corticosteroids and vitamin D,A.Antiepileptic drugs,Inhibiting both formation and spread of dischargesEffective for grand mal,partial simple seizures,status epilepticus,Phenobarbital 苯巴比妥,A.Antiepileptic drugs,Effective for psychomotor seizures,and grand malEffective

10、for mania,depression,and neuralgia,Carbamazepine 卡马西平,A.Antiepileptic drugs,Broad spectrum of antiepilepsyHepatic toxicity,Valproate sodium 丙戊酸钠,A.Antiepileptic drugs,CH3CH2CH2 CHCOOHCH3CH2CH2,Other antiepileptic drugsPrimidone 扑米酮：analogues of phenobarbital,used for phenobarbital-and phenytoin-inef

11、fective patientsMephenytoin 美芬妥英,Ethotoin 乙苯妥英：analogues of phenytoinEthosuximide 乙琥胺：peptit malDiazepam:status epilepticus(i.v.)Nitrozepam 硝西泮,Clonazepam 氯硝西泮：peptit malLamotrigine 拉莫三嗪,A.Antiepileptic drugs,Box Common toxicity of antiepileptic drugs:CNS reactions Hemological reactions Hepatic toxi

12、city,A.Antiepileptic drugs,Principals of antiepileptic drug uses1.Choice of drugs(1)Grand mal/Partial：Phenytoin,Carbamazepine,Phenobarbital Primidone,Valproate sodium(2)Peptit mal:Ethosuximide Clonazepam,Valproate sodium(3)Psychomotor：Carbamazepine,Phenytoin(4)Status epilepticus：Diazepan(i.v.)Phenyt

13、oin(i.v.),Phenobrbital(i.m.),A.Antiepileptic drugs,2.Dosage：small larger doses;dose individualization;plasma concentration monitoring if necessary3.Usage：drug combination4.Withdrawal：gradually and slowly,A.Antiepileptic drugs,1.Effects：central depression;vasodilatation,BP;relaxing skeletal muscles2.Uses：convulsion；hypertension crisis3.Adverse effects：depression of respiratory and vasomotor centers,antagonized by calcium preparations(i.v.),Magnesium Sulfate 硫酸镁,A.Anticonvulsant drugs,Other anticovulsant drugsSedative-hypnotic drugs,A.Anticonvulsant drugs,