Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 49
Filtrar
1.
AJNR Am J Neuroradiol ; 37(9): 1696-9, 2016 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-27102315

RESUMO

We describe a case series of suspected metallic embolism after coil embolization for intracranial aneurysms. Between January 2012 and December 2014, 110 intracranial aneurysms had been treated by coil embolization in our institution. In 6 cases, the postprocedural MR imaging revealed abnormal spotty lesions not detected on the preprocedural MR imaging. The lesions were also undetectable on the postprocedural CT scan. They were demonstrated as low-intensity spots on T1WI, T2WI, DWI, and T2*-weighted imaging. On DWI, they were accompanied by bright "halo," and on T2*-weighted imaging, they showed a "blooming" effect. In 3 of the 6 cases, follow-up MR imaging was available and all the lesions remained and demonstrated no signal changes. Although histologic examination had not been performed, these neuroradiologic findings strongly supported the lesions being from metallic fragments. No specific responsible device was detected after reviewing all the devices used for the neuroendovascular treatment in the 6 cases.


Assuntos
Embolização Terapêutica/efeitos adversos , Aneurisma Intracraniano/terapia , Embolia Intracraniana/etiologia , Adulto , Idoso , Idoso de 80 Anos ou mais , Imagem de Difusão por Ressonância Magnética , Feminino , Humanos , Embolia Intracraniana/diagnóstico por imagem , Imageamento por Ressonância Magnética , Masculino , Metais , Pessoa de Meia-Idade , Estudos Retrospectivos , Tomografia Computadorizada por Raios X , Resultado do Tratamento
2.
Transl Psychiatry ; 5: e654, 2015 Oct 06.
Artigo em Inglês | MEDLINE | ID: mdl-26440542

RESUMO

The human discs, large homolog 1 gene (DLG1) is mapped to the schizophrenia-susceptibility locus 3q29, and it encodes a scaffold protein that interacts with the N-methyl-D-aspartate receptor presumably dysregulated in schizophrenia. In the current study, we have newly identified a splicing variant of DLG1, which is transcribed from an unreported 95-base-pair exon (exon 3b) and is labeled 3b(+). We investigated the mRNA expression of 3b(+) in the post-mortem dorsolateral prefrontal cortices of patients with psychiatric disorders, obtained from The Stanley Medical Research Institute, and examined the potential association of the expression with the genotype of the single-nucleotide polymorphism (SNP) rs3915512 located within exon 3b. A real-time quantitative reverse transcriptase-polymerase chain reaction revealed that the mRNA levels of 3b(+) were significantly reduced in patients with early-onset schizophrenia (onset at <18 years old, P=0.0003) but not in those with non-early-onset schizophrenia, early-onset or non-early-onset bipolar disorder or in the controls. Furthermore, the genotype at the rs3915512 SNP was closely associated with the levels of 3b(+) mRNA expression. It is inferred that the T allele fails to meet the exonic splicing enhancer consensus, thus resulting in skipping of exon 3b, leading to the expression of 3b(-) (the previously known DLG1 variant) but not 3b(+). Because all the subjects with early-onset schizophrenia in the current study possess the T/T genotype, the reduced level of the DLG1 3b(+) transcript may be involved in the susceptibility and/or pathophysiology of early-onset schizophrenia.


Assuntos
Proteínas Adaptadoras de Transdução de Sinal/genética , Proteínas de Membrana/genética , Córtex Pré-Frontal/patologia , Esquizofrenia/genética , Idade de Início , Proteína 1 Homóloga a Discs-Large , Éxons , Feminino , Genes Supressores de Tumor , Predisposição Genética para Doença , Humanos , Masculino , Polimorfismo de Nucleotídeo Único , RNA Mensageiro/genética , Esquizofrenia/epidemiologia , Esquizofrenia/patologia
3.
Int J Oral Maxillofac Surg ; 38(11): 1159-64, 2009 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-19615860

RESUMO

The purpose of this study was to determine the differences in endocrine responses, blood loss and arterial blood gas profiles between patients subjected to hypotensive anaesthesia or normotensive anaesthesia and those between patients given sodium nitroprusside (SNP) or nitroglycerin (NTG) as the hypotensive agent. 36 patients, who were scheduled to undergo mandibular osteotomy, were recruited for the study. Their hormonal responses, metabolic responses, arterial blood gas profiles and blood loss were determined during hypotensive anaesthesia induced by either SNP or NTG and normotensive anaesthesia induced by sevoflurane (SEV). Blood loss was smaller and the duration of surgery was shorter in the SNP and NTG groups than in the SEV group. The plasma levels of adrenocorticotrophic hormone, cortisol, vasopressin, norepinephrine and dopamine increased during surgery in all 3 groups. There were no significant differences in the hormone levels, among the 3 groups, or between the SNP and NTG groups.


Assuntos
Anestesia Dentária/métodos , Perda Sanguínea Cirúrgica/prevenção & controle , Hormônios/sangue , Hipotensão Controlada/métodos , Mandíbula/cirurgia , Procedimentos Cirúrgicos Bucais , Vasodilatadores/farmacologia , Adulto , Anestésicos Inalatórios , Gasometria , Dióxido de Carbono/sangue , Feminino , Hemodinâmica/efeitos dos fármacos , Humanos , Ácido Láctico/sangue , Masculino , Éteres Metílicos/farmacologia , Nitroglicerina/farmacologia , Nitroprussiato/farmacologia , Osteotomia , Oxigênio/sangue , Ácido Pirúvico/sangue , Sevoflurano , Adulto Jovem
4.
Br J Pharmacol ; 155(5): 767-74, 2008 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-18660829

RESUMO

BACKGROUND AND PURPOSE: Substance P (SP), a representative member of the tachykinin family, is involved in nociception under physiological and pathological conditions. Recently, hemokinin-1 (HK-1) was identified as a new member of this family. Although HK-1 acts on NK(1) tachykinin receptors that are thought to be innate for SP, the roles of HK-1 in neuropathic pain are still unknown. EXPERIMENTAL APPROACH: Using rats that had been subjected to chronic constrictive injury (CCI) of the sciatic nerve as a neuropathic pain model, we examined the changes in expression of SP- and HK-1-encoding genes (TAC1 and TAC4, respectively) in the L4/L5 spinal cord and L4/L5 dorsal root ganglia (DRGs) in association with changes in pain-related behaviours in this neuropathic pain state. KEY RESULTS: The TAC4 mRNA level was increased on the ipsilateral side of the dorsal spinal cord, but not in DRGs, at day 3 after CCI. In contrast, the TAC1 mRNA level was significantly increased in the DRGs at day 3 after CCI without any changes in the dorsal spinal cord. Analysis of a cultured microglial cell line revealed the presence of TAC4 mRNA in microglial cells. Minocycline, an inhibitor of microglial activation, blocked the increased expression of TAC4 mRNA after CCI and inhibited the associated pain-related behaviours and microglial activation in the spinal cord. CONCLUSIONS AND IMPLICATIONS: The present results suggest that HK-1 expression is increased at least partly in activated microglial cells after nerve injury and is clearly involved in the early phase of neuropathic pain.


Assuntos
Limiar da Dor , RNA Mensageiro/biossíntese , Ciática/metabolismo , Medula Espinal/metabolismo , Taquicininas/biossíntese , Animais , Linhagem Celular , Modelos Animais de Doenças , Expressão Gênica/efeitos dos fármacos , Imuno-Histoquímica , Região Lombossacral , Masculino , Microglia/efeitos dos fármacos , Microglia/metabolismo , Minociclina/farmacologia , Limiar da Dor/efeitos dos fármacos , RNA Mensageiro/genética , Ratos , Ratos Sprague-Dawley , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Medula Espinal/efeitos dos fármacos , Taquicininas/genética
5.
Anaesthesia ; 62(6): 561-8, 2007 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-17506733

RESUMO

In a prospective, blind, randomised study, we examined the effects of midazolam-propofol co-induction on haemodynamic (blood pressure, heart rate and stroke volume) and heart rate variability. The latter was measured by spectral analysis using the maximum-entropy method to calculate the following: the low frequency component (LF), which reflects both the cardiac sympathetic and parasympathetic activity, the high frequency component (HF) and entropy, which reflects the cardiac parasympathetic activity, the total power (TP), calculated by the addition of LF and HF, and the LF/HF ratio, which reflects the balance between the cardiac sympathetic and parasympathetic nervous activity. Forty patients were randomly allocated to the propofol group and the midazolam-propofol group, and the parameters described above were calculated at baseline (T1), post induction (T2), after tracheal intubation (T3), and 3 min (T4) and 5 min after intubation (T5). Propofol was administered at 2.5 mg.kg(-1) in the propofol group and midazolam at 0.1 mg.kg(-1) followed by propofol at 1.5 mg.kg(-1) in the midazolam-propofol group for anaesthesia induction. Then, propofol was administered at 4-6 mg.kg(-1)propofol for maintenance in both groups. The midazolam-propofol group showed compensated haemodynamic changes, which were related to significant increases in the LF/HF ratio at T2, T4 and T5 (p = 0.011, 0.038 and 0.034). These results suggest that the midazolam-propofol combination yielded compensated modulatory effects on the cardiovascular system, including preserved baroreflex activity.


Assuntos
Frequência Cardíaca/efeitos dos fármacos , Midazolam/farmacologia , Propofol/farmacologia , Volume Sistólico/efeitos dos fármacos , Adulto , Anestésicos Intravenosos/farmacologia , Barorreflexo/efeitos dos fármacos , Pressão Sanguínea/efeitos dos fármacos , Método Duplo-Cego , Eletrocardiografia/efeitos dos fármacos , Feminino , Humanos , Hipnóticos e Sedativos/farmacologia , Intubação Intratraqueal , Masculino , Pessoa de Meia-Idade , Monitorização Intraoperatória/métodos , Estudos Prospectivos
6.
Anesth Prog ; 53(3): 95-7, 2006.
Artigo em Inglês | MEDLINE | ID: mdl-17175823

RESUMO

A 62-year-old man visited our clinic for dental implantation under intravenous sedation. He demonstrated increased psychomotor activity and incomprehensible verbal contact during intravenous sedation. Although delirium caused by midazolam or propofol in different patients has been reported, the present case represents a delirium that developed from both drugs in the same patient, possibly because of the patient's smaller tolerance to midazolam and propofol.


Assuntos
Anestesia Dentária/efeitos adversos , Anestésicos Combinados/efeitos adversos , Anestésicos Intravenosos/efeitos adversos , Sedação Consciente/efeitos adversos , Delírio/induzido quimicamente , Hipnóticos e Sedativos/efeitos adversos , Midazolam/efeitos adversos , Propofol/efeitos adversos , Aumento do Rebordo Alveolar , Anestesia Dentária/métodos , Sedação Consciente/métodos , Implantação Dentária Endóssea , Humanos , Masculino , Pessoa de Meia-Idade , Agitação Psicomotora/etiologia
7.
Acta Anaesthesiol Scand ; 49(8): 1218-20, 2005 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-16095466

RESUMO

In two patients, one with Klippel-Feil syndrome and one with fibrous dysplasia of the maxilla, no part of the larynx could be visualized by direct laryngoscopy. In both cases, the use of an intubation device equipped with a charge-coupled device camera, the endotracheal intubation device (EID), allowed smooth tracheal intubation.


Assuntos
Intubação Intratraqueal/instrumentação , Adolescente , Idoso , Anestesia Geral/métodos , Feminino , Displasia Fibrosa Monostótica/complicações , Humanos , Síndrome de Klippel-Feil , Laringoscopia/métodos , Doenças Maxilares/complicações , Procedimentos Cirúrgicos Bucais/métodos , Osteotomia/métodos
8.
Med Biol Eng Comput ; 43(5): 622-9, 2005 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-16411635

RESUMO

The purpose of the study was to determine whether lidocaine could be transported through living rat skin using alternating current and to determine whether lidocaine transport depends on voltage. The drug delivery cell was originally constructed for the application of an electric field. Hairless rats were anaesthetised using sevoflurane, and a tracheotomy was performed. The drug delivery cell, with lidocaine solution in the donor cell, was placed on the abdominal skin. Samples were collected from the subcutaneous tissue using a microdialysis probe inserted into the abdominal subcutaneous tissue, and the lidocaine concentrations in the samples were determined using high-performance liquid chromatography. The lidocaine concentration in the rat skin increased in time, and voltage-dependency was approximately linear. The lidocaine concentration after the application of 20 V for 21 min was about ten-fold higher than that observed after 21 min of passive diffusion. Lidocaine was successfully transported through living rat skin in a voltage- and time-dependent manner. This drug delivery cell may contribute to local anaesthesia and pain management of human skin.


Assuntos
Anestésicos Locais/farmacocinética , Iontoforese/métodos , Lidocaína/farmacocinética , Absorção Cutânea , Administração Cutânea , Animais , Sistemas de Liberação de Medicamentos , Masculino , Ratos , Ratos Nus
9.
Acta Anaesthesiol Scand ; 48(3): 382-3, 2004 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-14982576

RESUMO

We report a case in which a mandibular nerve block using an indwelling catheter was employed for pain management in a terminal case of orofacial cancer. The patient was a 74-year-old female weighing 27 kg. She had a 27-month history of mouth floor and tongue cancer. The cancer recurred and spread to bilateral face and neck. The severest pain mainly originated from the right mandibular region. Two steps of pain relief were performed for the patient. First, pain control using 1% lidocaine or 0.25% bupivacaine administered intermittently or continuously through an indwelling catheter in the mandibular nerve was performed for 1 week to estimate the amount of pain relief thereby obtained. Second, a neurolytic block was applied to the mandibular nerve through the catheter. After the neurolytic block, the total dosage of morphine and diclofenac remained unchanged for 2 months. We conclude from the present case that this technique is an excellent means of obtaining long-term pain control in patients with intractable orofacial cancer pain.


Assuntos
Cateteres de Demora , Nervo Mandibular/efeitos dos fármacos , Neoplasias Bucais/complicações , Bloqueio Nervoso , Dor Intratável/prevenção & controle , Idoso , Anestésicos Locais/administração & dosagem , Bupivacaína/administração & dosagem , Neoplasias Faciais/secundário , Feminino , Humanos , Lidocaína/administração & dosagem , Recidiva Local de Neoplasia/complicações , Bloqueio Nervoso/instrumentação , Medição da Dor
10.
Br J Anaesth ; 91(5): 749-52, 2003 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-14570804

RESUMO

We report two cases who exhibited a decrease in their bispectral index (BIS) score, associated with syncope during venipuncture in patients with suspected needle phobia. In case 1, the reduction in BIS score occurred during the development of hypotension and bradycardia and may well have been caused by cerebral hypoperfusion. In case 2, the patient lost consciousness with decreasing BIS score before hypotension and bradycardia; this patient's condition could not be completely explained by cerebral hypoperfusion as a result of a vasovagal reflex because the patient's blood pressure and heart rate remained normal during the syncopal episode.


Assuntos
Eletroencefalografia , Agulhas , Transtornos Fóbicos/complicações , Síncope Vasovagal/diagnóstico , Adulto , Bradicardia/etiologia , Humanos , Hipotensão/etiologia , Masculino , Síncope Vasovagal/etiologia
11.
Acta Anaesthesiol Scand ; 46(10): 1279-80, 2002 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-12421203

RESUMO

Patients with Gilles de la Tourette's syndrome develop symptoms during childhood. Repetitive various motor tics or speech tics that are spontaneous, aimless, and involuntary are characteristic of the syndrome (1). Patients with the syndrome have been considered to have an aggressive, impulsive, and obsessive character (2). (3). Suicide is one of the mental symptoms of the syndrome. Routine dental treatment with this syndrome can be difficult.


Assuntos
Anestesia Geral , Anestesia Intravenosa , Assistência Odontológica para a Pessoa com Deficiência , Restauração Dentária Permanente , Síndrome de Tourette/tratamento farmacológico , Adolescente , Humanos , Masculino
12.
Med Biol Eng Comput ; 40(5): 533-41, 2002 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-12452413

RESUMO

The effects of electrode polarisation on the observed capacitances of electrolytic solutions, including whole blood, plasma and potassium chloride solution, have been investigated experimentally in the frequency region from 10 to 10(5) Hz, by varying the area of the electrodes using plate and mesh electrodes, by varying the electrode distance, and by varying the concentration of KCl in the potassium chloride solution. The effects of the electrode polarisation on the observed capacitances were most significant in the frequencies lower than 10(2) Hz, but cannot be neglected in any frequency region. The so-called alpha dispersion observed in the frequencies lower than about 10(3) Hz was reproduced theoretically with an equivalent circuit model, using constant values independent of frequency for the four circuit parameters: sample capacitance, sample conductivity, electrode polarisation capacitance and electrode polarisation conductivity. It was concluded that the observed alpha dispersion is not a real one that represents the specific features of the samples themselves, but an apparent one that represents the characteristics of the whole measurement system, including the electrode polarisation.


Assuntos
Fenômenos Fisiológicos Sanguíneos , Capacitância Elétrica , Eletrólitos/química , Modelos Teóricos , Cloreto de Potássio/química , Eletrodos , Humanos
13.
J Control Release ; 73(1): 37-47, 2001 May 18.
Artigo em Inglês | MEDLINE | ID: mdl-11337058

RESUMO

The efficiency and the voltage dependence of the AC iontophoresis were studied in vitro. Two cylindrical glass cells separated by a cellophane film were used, where the donor cell was filled with the solution of target electrolytes and the receptor cell with distilled water. The sinusoidal AC voltage with a frequency of 1 kHz was applied between the two platinum plates located at the opposite ends of two cells. The time variation of the ion concentration was evaluated by measuring the impedance of the solution in the receptor cell. The transportation velocity of the ions increased with the amplitude of the voltage applied between two platinum plate electrodes apart 20 mm up to approximately 15 V, and leveled off above approximately 15 V. A theoretical model is proposed on the AC iontophoresis, where each ion moves together with the surrounding water molecules when it is hydrated. The effective Stokes radius of an ion is assumed to be half of the whole size of the ion with hydrating water molecules. When the external alternating electric field strongly vibrates the ion, the ion-dipole interactions between the ion and water molecules are broken, resulting in the reduced effective Stokes radius, which leads to the increase of the diffusion efficiency.


Assuntos
Iontoforese/métodos , Algoritmos , Celofane , Difusão , Impedância Elétrica , Eletrodos , Campos Eletromagnéticos , Cinética , Modelos Biológicos , Permeabilidade , Cloreto de Sódio/química
14.
Brain Res Cogn Brain Res ; 11(1): 39-46, 2001 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-11240110

RESUMO

The purpose of this study was to determine the relationship between the late component of somatosensory evoked potentials (SEP) induced by electrical tooth stimulation and subjective pain estimation when heterotopically painful stimulation was delivered to humans. The noxious electrical conditioning stimuli were applied to the left median nerve in noxious session I and the right median nerve in noxious session II for 10 min. The amplitude of the late component and visual analogue scale (VAS) value were both decreased significantly by conditioning stimuli in both sessions. The maximum decreases in SEP amplitude and VAS value induced by conditioning stimuli were respectively 40.2 and 37.2% in noxious session I and 49.3 and 42.3% in noxious session II. After-effect was observed 5 min after removal of the conditioning stimuli. The rates of decrease were thus nearly the same and independent of the site of conditioning stimulation in noxious sessions I and II. The SEP amplitude was significantly correlated with VAS values. The present study revealed that SEP amplitude and subjective pain intensity estimated by VAS following electrical tooth stimulation can be decreased by noxious stimuli to hand. This finding that heterotopic painful stimulation attenuates experimentally-induced tooth pain suggests a triggering of diffuse noxious inhibitory control (DNIC) with after-effect in trigeminal region.


Assuntos
Potenciais Somatossensoriais Evocados/fisiologia , Medição da Dor/métodos , Dente/fisiologia , Adulto , Condicionamento Psicológico/fisiologia , Estimulação Elétrica/métodos , Mãos/inervação , Humanos , Masculino , Nervo Mediano/fisiologia , Inibição Neural/fisiologia , Tempo de Reação/fisiologia
15.
Can J Anaesth ; 47(11): 1141-3, 2000 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-11097547

RESUMO

PURPOSE: Propofol is widely used for general anesthesia because of its rapid onset and recovery. We had four cases that had higher body temperatures toward the end of anesthesia. The etiology of the hyperthermia is discussed. CLINICAL FEATURES: Four patients (three male, one female, 22-26 yr of age, weighing 53-57 kg) with facial deformities were anesthetized with propofol infusion (3-10 mg x kg(-1) x hr(-1)) and fentanyl (400-1,300 microg) without nitrous oxide, immobilized with vecuronium bromide (18-37 mg) or pancuronium bromide (31 mg). In order to reduce blood loss and improve the surgical view, tri-nitro-glycerin (TNG) was used in all cases. Osteotomy of maxilla and mandible or sagittal split ramus osteotomy of mandible was successfully performed. Although their body temperatures were normal preoperatively and stable during the operation, toward the end of anesthesia (one hour), they increased to over 38 degrees C. The room temperature was decreased and the water blanket on the operating table was also decreased. In addition, cool crystalloid solution was infused. Body temperature returned to normal in the ward and no complications due to the high temperature were seen postoperatively. It is thought that lighter anesthesia was masked by continuous infusion of propofol and TNG-induced hypotension and that benign hyperthermia occurred toward the end of anesthesia. CONCLUSION: Propofol reduces blood pressure, which suggests deep anesthesia. However, care must be taken to maintain the optimum depth of anesthesia during propofol anesthesia, especially when deliberate hypotensive anesthesia is induced.


Assuntos
Anestesia Intravenosa/efeitos adversos , Anestésicos Intravenosos/efeitos adversos , Febre/etiologia , Propofol/efeitos adversos , Adulto , Feminino , Humanos , Masculino
16.
Kokubyo Gakkai Zasshi ; 67(2): 207-12, 2000 Jun.
Artigo em Japonês | MEDLINE | ID: mdl-10921245

RESUMO

Suginoki Dental Clinic, which is managed by Suginami Dental Association, financially supported by Suginami City, and technically assisted by the University Hospital, Tokyo Medical and Dental University, was established for dental treatment of handicapped persons living in Suginami City, Tokyo who are difficult to be treated by private practitioners. It has one full-time dentist, 12 part-time dentists, two dental hygienists, one nurse, and one clerk; one of the part-time dentists practices twice a week there. Since December 1994, 406 patients visited the clinic and the total cases was 9,273 in December 1999; 99 cases were mentally retarded, 36 autism, and 30 epileptic patients in the younger group; and 65 cases were cerebrovascular disease and 27 cardiac malfunction patients in the older group. Almost all the patients needed special care such as monitoring, intravenous sedation, nitrous oxide sedation, and general anesthesia. Four cases underwent general anesthesia, and no complication was seen among the cases. It was concluded that the clinic has been successful due to a good relationship among the Dental Association, Suginami City, and the dental hospital.


Assuntos
Odontologia Comunitária , Serviços de Saúde Comunitária , Assistência Odontológica para a Pessoa com Deficiência , Serviços de Saúde Bucal , Hospitais Universitários , Assistência Odontológica Integral , Unidade Hospitalar de Odontologia , Humanos , Japão
17.
Org Lett ; 2(12): 1689-91, 2000 Jun 15.
Artigo em Inglês | MEDLINE | ID: mdl-10880202

RESUMO

The non-Kolbe reaction of N-benzoyloxazolidine derivatives 6 derived from L-serine gave optically active N,O-acetals 7 when graphite was used as an anode material. This reaction represents the first example of "memory of chirality" in carbenium ion chemistry. The material used for the anode was critical for the memory of chirality. The substitution of carboxyl group with methoxyl group was found to proceed with an inversion mechanism.

18.
J Auton Nerv Syst ; 79(2-3): 129-35, 2000 Mar 15.
Artigo em Inglês | MEDLINE | ID: mdl-10699643

RESUMO

The effects on cardiovascular functions of noxious stimulation to the orofacial areas innervated by trigeminal afferent nerves were analyzed in urethane-anesthetized, spinal cord-intact rats and in rats acutely spinalized at the second cervical level. In the spinal cord-intact rats, pinching of the upper lip produced increases in both heart rate (HR) and mean arterial pressure (MAP). Both responses were considered to be due to activation of sympathetic efferent nerves to the cardiovascular organs. Both responses were attenuated but did not disappear after spinalization at the C2 level. In spinalized rats, sympathetic preganglionic neurons emerging from the thoracolumbar spinal cord could not receive any neural influences from the brain. The HR response in the spinal rats was abolished after either bilateral vagotomy or intravenous injection of a peripherally acting muscarinic cholinergic receptor antagonist, methylatropine. This suggests that the increase in HR was elicited via vagal cholinergic efferent fibers, probably by decreasing tonic activity of vagus nerves to the heart. In spinal rats, neither vagotomy nor cholinergic blockade affected the increase in MAP, but i.v. injection of the vasopressin V1 receptor antagonist, OPC-21268, abolished the response of MAP. This suggests that the response of MAP was due to peripheral vasoconstriction elicited by vasopressin secreted from the posterior pituitary lobe. The present study demonstrated that, in rats acutely spinalized at the C2 level, noxious stimulation of orofacial areas innervated by the trigeminal nerve could produce reflex increases both in HR, by decreasing cholinergic vagal nerve activity to the heart, and blood pressure, by secreting vasopressin from the pituitary gland, even though sympathetic efferent innervation to the cardiovascular organs could not be directly affected by trigeminal afferent nerve excitation.


Assuntos
Sistema Cardiovascular/fisiopatologia , Estado de Descerebração/fisiopatologia , Reflexo , Nervo Trigêmeo/fisiopatologia , Animais , Derivados da Atropina/farmacologia , Pressão Sanguínea/efeitos dos fármacos , Pressão Sanguínea/fisiologia , Frequência Cardíaca/efeitos dos fármacos , Frequência Cardíaca/fisiologia , Masculino , Parassimpatolíticos/farmacologia , Piperidinas/farmacologia , Quinolonas/farmacologia , Ratos , Ratos Wistar , Valores de Referência , Vagotomia
19.
Okajimas Folia Anat Jpn ; 77(5): 161-6, 2000 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-11218714

RESUMO

Morphological features of the hind limb muscles reflect the muscular function correlating with the locomotion. In this study, the muscles of the baboon hind limb were weighed and the relative muscle weights were compared with those of the human lower extremity. In the baboon, the biceps femoris was the largest (11.60%) and the vastus lateralis (10.67%) was placed second. The gluteus medius (8.55%) among the hip muscles and the gastrocnemius (4.38%) among the leg muscles were predominant in each segment. The relative weights of the gluteus medius and the biceps femoris were especially larger in the baboon than in the human, while the gluteus maximus and the soleus were larger in the human. The baboon gluteus medius and biceps femoris chiefly generate the propulsive power during quadrupedal locomotion and the human soleus is essential for the erect bipedalism.


Assuntos
Movimento/fisiologia , Músculo Esquelético/anatomia & histologia , Músculo Esquelético/fisiologia , Animais , Articulação do Tornozelo/fisiologia , Membro Posterior , Articulação do Quadril/fisiologia , Humanos , Articulação do Joelho/fisiologia , Locomoção/fisiologia , Masculino , Tamanho do Órgão , Papio
20.
Masui ; 47(4): 481-3, 1998 Apr.
Artigo em Japonês | MEDLINE | ID: mdl-9594523

RESUMO

A 61 year old male patient with left mandibular cyst, received marsupialization of the left mandible under general anesthesia. Four hours after the end of anesthesia, his memory for the past 4 months and short term memory plastisity were impaired. No neurological abnormalies were found at that time. On the 2nd postoperative day, he recovered his lost memory for the past 4 months. The memory of events between 6 hours before operation and next morning, however, remained lost. It is suggested that the memory disorder is the TGA due to various causes including transient hypertension, operative stress, postoperative pain and diazepam.


Assuntos
Amnésia/etiologia , Anestesia Geral/efeitos adversos , Adjuvantes Anestésicos/efeitos adversos , Diazepam/efeitos adversos , Humanos , Masculino , Pessoa de Meia-Idade
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...