Presentation on theme: "ETIOPATOGENIA EXISTE BASE GENETICA? PORQUE RESPONDE AL OH? QUE ESTRUCTURAS CAUSAN EL TEMBLOR? CUAL ES EL NT MAS IMPORTANTE? EXISTE DETERIORO COGNITIVO?"— Presentation transcript:
ETIOPATOGENIA EXISTE BASE GENETICA? PORQUE RESPONDE AL OH? QUE ESTRUCTURAS CAUSAN EL TEMBLOR? CUAL ES EL NT MAS IMPORTANTE? EXISTE DETERIORO COGNITIVO? MORTALIDAD ESTA AUMENTADA? CUAL ES LA BASE NEUROPATOLOGICA? INFLUYEN FACTORES DIETETICOS-METABOLICOS? OVERLAP CON OTRAS ENTIDADES EXPERIMENTACION ANIMAL NEUROIMAGEN FUNCIONAL NEUROCIRUGIA FUNCIONAL
¿ EXISTE BASE GENETICA? 50 % AF – AD (65 %) POLIGENICA. PENETRANCIA COMPLETA A LOS 65. DETECCION EN FAMILIAS DE GENES INVOLUCRADOS : Cr. 4 P; 3 Q13 (ETM 1); (D3) 2 P22-25(ETM2) 6p 23 ASOCIACIONES: EP – D – M- CMT
¿QUE ESTRUCTURA CAUSA EL TEMBLOR? PET Hemisferios Cerebelosos Via dento-rubro-talamica- cortical Oscilador talámico Oscilador olivar Aceleración ritmo descarga MNI Oscilador central origina; periferia modula; influencia somatosensitiva. * Hiperfunción via cerebelo talamica (Glutamato), reversible c/OH Estudios de Coherencia (sincronía EMG – NI áreas cer.): varios osciladores según topografía del temblor. NEUROCIRUGIA FUNCIONAL: NVI NEUROPATOLOGÍA: celulas torpedo (Pk), CL, atrofia dentado. ESTIMULACION MAGNETICA TRANSCRANEANA CEREBELO TEMBLOR EN LAS HEREDOATAXIAS DISFUNCIONES OME EN TE
A positron emission tomography study of essential tremor: Evidence for overactivity of cerebellar connections Dr. I. H. Jenkins, MRCP 1 *, P. G. Bain, MRCP 2, J. G. Colebatch, FRACP 1, P. D. Thompson, PhD. 2, L. J. Findley, MD 2, R. S. J. Frackowiak, MD 1, C. D. Marsden, DSc 2, D. J. Brooks, MD 1 1 Medical Research Council (MRC) Cyclotron Unit, Hammersmith Hospital, London, United Kingdom 2 MRC Human Movement and Balance Unit, National Hospital for Neurology and Neurosurgery, London, United Kingdom * Correspondence to I. H. Jenkins, MRC Cyclotron Unit, Hammersmith Hospital, DuCane Road, London W12 OHS, UK ABSTRACT The origin of essential tremor is unknown. Animal models have suggested that the inferior olivary nucleus may act as a tremor generator. We used positron emission tomography to study changes in regional cerebral blood flow associated with involuntary postural tremor and passive wrist oscillation in patients with essential tremor. Activation due to voluntary wrist oscillation and arm extension without tremor was studied in normal control subjects. The essential tremor group had bilaterally increased cerebellar blood flow at rest (without tremor) compared with the control group. Involuntary postural tremor was associated with further bilateral cerebellar activation, and also contralateral striatal, thalamic, and sensorimotor cortex activation. Voluntary wrist oscillation, maintained arm extension without tremor, and passive wrist oscillation were all associated with significant ipsilateral rather than bilateral cerebellar activation. We conclude that essential tremor is associated with increased bilateral cerebellar activity both at rest and during tremor. Received: 24 August 1992; Revised: 27 January 1993; Accepted: 11 February 1993
Lesión o (+) NVI tálamo (eferencia cerebelosa) mejora temblor: normaliza oscilación celular anómala en Hemisferios Cerebelosos
OH 50 % ¿POR QUÉ? ETANOL MODULA (-) GLUTAMATO A TRAVES DE RECEPTOR NMDA, VIA HIPERACTIVADA EN EL TEMBLOR ESENCIAL.
Eur J Neurol Jul;15(7): Epub 2008 May 15. Links A possible mechanism for the beneficial effect of ethanol in essential tremor. Manto M, Laute MA. Manto MLaute MA Laboratoire de Neurologie Expérimentale, ULB-Erasme, Bruxelles, Belgium. BACKGROUND: Essential tremor is one of the most common movement disorders in elderly people. The hypothesis of a disregulation of N-methyl-D-aspartate (NMDA) pathways has been suggested. It was shown experimentally that infusion of NMDA in cerebellar nuclei down-regulates glutamate release. METHODS: We assessed the effects of intranuclear administration of harmaline on the NMDA-mediated regulation of glutamate in rats using reverse dialysis. We hypothesized that ethanol, which improves essential tremor in the clinic, antagonizes the effect of harmaline upon glutamatergic transmission. We tested the interaction of ethanol and harmaline upon glycerol (a marker of membrane turn-over), lactate, and pyruvate concentrations. RESULTS: Harmaline increased the concentrations of glutamate and impaired the NMDA-mediated regulation of glutamate. Ethanol decreased the concentrations of glutamate during NMDA stimulation in case of pre-administration with harmaline. Concentrations of glycerol rose with harmaline. Glycerol levels markedly decreased during NMDA infusion when inhibitors of nitric oxide synthase, alpha-amino-3-hydroxy-5-methylisoxazole-4-propionate antagonists or NMDA antagonists were administered. Harmaline increased lactate/pyruvate ratios during NMDA infusion but these ratios returned to normal values in presence of ethanol. DISCUSSION: We provide a possible mechanism for the beneficial effect of ethanol on essential tremor. The concept of glutamatergic disregulation underlying essential tremor is highlighted. Consequences for our understanding of essential tremor are discussed. PMID: [PubMed - indexed for MEDLINE]
Neurology 2006 ;66;69-74
Ann Neurol Apr;17(4): Association between essential tremor and Parkinson's disease. Geraghty JJ, Jankovic J, Zetusky WJ. To examine a possible relationship of essential tremor to Parkinson's disease (PD), 130 patients with essential tremor were studied. Twenty-five patients had both essential tremor and PD. These 25 patients were matched for age and duration of PD symptoms with 25 patients who had idiopathic PD. Bradykinesia, postural instability, and gait difficulty were more severe in the patients with idiopathic PD. Degree of tremor, rigidity, and functional disability did not differ in the two groups. The prevalence of PD in the population with essential tremor was 24 times greater than expected. This study suggests that some patients with essential tremor have a genetically increased risk for PD. PMID: [PubMed - indexed for MEDLINE] Geraghty JJJankovic JZetusky WJ
Muscle Nerve Sep;16(9): Links Hereditary motor-sensory neuropathy and movement disorders. Cardoso FECardoso FE, Jankovic J.Jankovic J Department of Neurology, Parkinson's Disease Center and Movement Disorders Clinic, Baylor College of Medicine, Houston, Texas To explore the relationship between hereditary motor and sensory neuropathy (HMSN) and movement disorders, we examined 7 patients with HMSN referred to our Movement Disorders Clinic and surveyed members of the Charcot-Marie-Tooth association. The following movement disorders were observed in the index patients: postural tremor in 6, rest tremor in 3, and Parkinsonism and dystonia in 2. Tremor, present in 40% of the 201 patients who responded to the survey, was first noted at a mean age of 36 years, and mostly involved the hands. Family history of tremor was more frequent in the tremor group (P < 0.005), which also had a significantly worse writing score than the nontremor group (P < 0.001). The overlap in clinical features between HMSN-associated tremor and essential tremor (ET), the high frequency of family history of tremor, and the lack of a relationship between the severity of tremor and of peripheral neuropathy suggest that the tremor in HMSN is pathogenically related to ET. PMID: [PubMed - indexed for MEDLINE]
Benito- León J and Louis ED (2006) Essential tremor: emerging views of a common disorder Nat Clin Pract Neurol 2: 666– /ncpneuro0347 Figure 4 Archimedean spirals drawn by individuals with and without essential tremor TRATAMIENTO
IDENTIFICAR CAUSAS: INTERROGAR - TSH EXPLICAR Q NO PADECE EP NO TRATAR SI NO INTERF. FUNCIONALIDAD IDENTIFICAR y FAVORECER CONDUCTAS (-) EL TRATAMIENTO ES SINTOMATICO LARGO PLAZO A MENUDO MAL TOLERADO CONTRAINDICACIONES
ALCOHOL NIVEL de EVIDENCIA II-B 1 – 2 TRAGOS ALCOHOL ETILICO REDUCE 75 % el TEMBLOR EN % de los PACIENTES TRANSITORIO: 45 – 60 MINUTOS PUEDE DESARROLLARSE TOLERANCIA ADVERTIR EVITAR ABUSO EL RIESGO DE ADICCION ES BAJO
ALPRAZOLAM 0,25 – 1 mgs. v/o HORAS ANTES DE UN EVENTO
Neurology 2005;64; ; originally published online Jun 22, 2005 ; This information is current as of August 20, 2008
Abstract—Background: Essential tremor (ET) is one of the most common tremor disorders in adults and is characterized by kinetic and postural tremor. To develop this practice parameter, the authors reviewed available evidence regarding initiation of pharmacologic and surgical therapies, duration of their effect, their relative benefits and risks, and the strength of evidence supporting their use. Methods: A literature review using MEDLINE, EMBASE, Science Citation Index, and CINAHL was performed to identify clinical trials in patients with ET published between 1966 and August Articles were classified according to a four-tiered level of evidence scheme and recommendations were based on the level of evidence. Results and Conclusions: Propranolol and primidone reduce limb tremor (Level A). Alprazolam, atenolol,gabapentin (monotherapy), sotalol, and topiramate are probably effective in reducing limb tremor (Level B). Limitedstudies suggest that propranolol reduces head tremor (Level B). Clonazepam, clozapine, nadolol, and nimodipine possibly reduce limb tremor (Level C). Botulinum toxin A may reduce hand tremor but is associated with dose-dependent hand weakness (Level C). Botulinum toxin A may reduce head tremor (Level C) and voice tremor (Level C), but breathiness, hoarseness, and swallowing difficulties may occur in the treatment of voice tremor. Chronic deep brain stimulation (DBS) (Level C) and thalamotomy (Level C) are highly efficacious in reducing tremor. Each procedure carries a small risk of major complications. Some adverse events from DBS may resolve with time or with adjustment of stimulator settings. There is insufficient evidence regarding the surgical treatment of head and voice tremor and the use of gamma knife thalamotomy (Level U). Additional prospective, double-blind, placebo-controlled trials are needed to better determine the efficacy and side effects of pharmacologic and surgical treatments of ET. NEUROLOGY 2005;64:2008–2020
B-BLOQUEANTES PROPANOLOL (OTROS: TIMOLOL NADOLOL SOTALOL METOPROLOL) NIVEL DE EVIDENCIA I-A (DE ELECCION) (-) REC. B2 PERIFERICOS, TB. PROBABLE CENTRAL B1 CONTRAINDICACIONES: INS. CARD (II-III); DM, ASMA, EPOC, AOC, BAV 2-3. EFECTOS SECUNDARIOS: FATIGA, IMPOTENCIA, DEPRESION, HIPOTENSION, ARRITMIAS.
PROPANOLOL DOSIS INDIVIDUALIZADA EFECTO NO ES DOSIS DEPENDIENTE 40 mg 1 VEZ AL DIA POR 3 DIAS AUMENTAR 40 mg CADA 3 DIAS HASTA 120 (EN 3 TOMAS O PREPARADOS DE ACCION PROLONGADA) SI NO HAY RESPUESTA AUMENTAR A 160 mg/dia. SI NO RESPONDE RETIRAR GRADUALMENTE (AUNQUE HASTA 320 PUEDE HABER RESPUESTA) CONTROLA EL TEMBLOR EN UN 50%, S/T MANOS, EN 50 – 70% DE LOS PACIENTES, ALGUNOS RESPUESTA NOTABLE, OTROS NO RESPONDEN
PRIMIDONA REDUCE % TEMBLOR EN 50 – 70 % DE LOS PACIENTES, S/T MANOS. EVIDENCIA I-A BARBITURICO METABOLIZA A FENOBARBITAL, PERO SU ACCION ANTITEMBLOR ES INDEPENDIENTE, PROBABLEMENTE CENTRAL INICIAR EN DOSIS BAJAS 62,5 mg. (1/4 comp. 250) *NO HAY COMP DE 50 o 60*. DE NOCHE. CADA 3 DIAS PASAR A ½ COMP., LUEGO ¾, LUEGO 1. SI NO BASTA DOSIS UNICA NOCTURNA DE 250 mg, AGREGAR 1 o 2 tomas mas de ½ COMP (125) EN LA M y la T. FRECUENTE INTOLERANCIA 25 % (VARIABLE, FARMACOGENETICA): HIPERSOMNIA, MAREOS, VERTIGOS, NAUSEAS, OBNUBILACION, COMA, RASH. 24 – 72 % SE ALIVIA.
Zesiewicz, T. A. et al. Neurology 2005;64:
Benito- León J and Louis ED (2006) Essential tremor: emerging views of a common disorder Nat Clin Pract Neurol 2: 666– /ncpneuro0347 Table 1 Pharmacological agents for the treatment of essential tremor