Asunto(s)
Placas Óseas , Implantes Dentales , Durapatita , Reconstrucción Mandibular , Poliésteres , Andamios del Tejido , Trasplante Óseo , Humanos , MandíbulaRESUMEN
Unconsummated marriage (UM) is the failure to perform successful sexual intercourse at the beginning of the marriage. Vaginismus has been traditionally reported as the leading cause. ED is also a leading cause for UM. This appears to be a significant problem in the conservative middle-Eastern societies and in the developing countries, where couples are strongly prevented by religious rules and cultural taboos from sexual experiences before wedding. One could think that according to major sexual freedom and information, in Western countries UM is now disappearing, but the number of observed cases by the authors in 2008-2012 was relevant. The aim of this study is to compare the literature data from non-Western countries with the features of UM in Western ones, focusing on cases observed by the authors, and to verify whether the etiology of UM proposed in the '70s is still relevant, outlining any changes that occur in current reality. In our series, traditional appearance of UM is no more effective, while the role of man is undervalued, because of his frailty, lack of self-confidence and ignorance, expressing a social and cultural change of man's role in the couple.
Asunto(s)
Coito/psicología , Disfunción Eréctil/etiología , Matrimonio , Conducta Sexual/psicología , Disfunciones Sexuales Psicológicas/etiología , Vaginismo/etiología , Coito/fisiología , Disfunción Eréctil/fisiopatología , Disfunción Eréctil/psicología , Femenino , Humanos , Masculino , Conducta Sexual/fisiología , Disfunciones Sexuales Psicológicas/fisiopatología , Disfunciones Sexuales Psicológicas/psicología , Encuestas y Cuestionarios , Vaginismo/fisiopatología , Vaginismo/psicologíaRESUMEN
The potential toxicity of stannum dioxide (SnO2), cerium dioxide (CeO2) and iron oxide (Fe3O4) nanoparticles (NPs) in the marine environment was investigated using the sea urchin, Paracentrotus lividus, as an in vivo model. We found that 5 days after force-feeding of NPs in aqueous solutions, the three NPs presented different toxicity degrees, depending on the considered biomarkers. We examined: 1) the presence of the NPs in the coelomic fluid and the uptake into the immune cells (coelomocytes); 2) the cholinesterase activity and the expression of the stress-related proteins HSC70 and GRP78; 3) the morphological changes affecting cellular compartments, such as the endoplasmic reticulum (ER) and lysosomes. By Environmental Scanning Electron Microscope (ESEM) analysis, coupled with Energy Dispersive X-ray Spectroscopy (EDS) we found that NPs were uptaken inside coelomocytes. The cholinesterases activity, a well known marker of blood intoxication in vertebrates, was greatly reduced in specimens exposed to NPs. We found that levels of stress proteins were down-regulated, matching the observed ER and lysosomes morphological alterations. In conclusion, this is the first study which utilizes the sea urchin as a model organism for biomonitoring the biological impact of NPs and supports the efficacy of the selected biomarkers.
Asunto(s)
Nanopartículas del Metal/toxicidad , Óxidos/toxicidad , Paracentrotus/efectos de los fármacos , Contaminantes Químicos del Agua/toxicidad , Animales , Bioensayo , Biomarcadores/metabolismo , Colinesterasas/metabolismo , Activación Enzimática/efectos de los fármacos , Paracentrotus/citología , Paracentrotus/enzimología , Paracentrotus/metabolismo , Contaminantes Químicos del Agua/metabolismoRESUMEN
OBJECTIVE: This empirical study has its main object in highlighting the role of mother-child interactive experiences in the development of affective and communicative exchanges in infancy. METHODS: The study analyzed four groups of mother-child couples with children who presented a Specific Language Disorder (SLD) the first, a Feeding Disorder (FD) the second, the third an association of SLD and FD, and a fourth non clinical group. Diagnostic assessments were done through: a specific linguistic protocol, the Italian version of the Feeding Scale-Observational Scale for Mother-Infant Interactions during Feeding, specific psychodiagnostic questionnaires for mothers and children. CONCLUSION: A distortion in the communication area can significantly weigh upon the quality of infant-caregiver relationship: our data on mothers of children with a SLD/FD comorbidity confirm this finding by describing their children as prone to isolation and withdrawal, thus directing their efforts and worries to a specifically communicative and relational factor.
Asunto(s)
Conducta Alimentaria , Trastornos de Alimentación y de la Ingestión de Alimentos/psicología , Trastornos del Lenguaje/psicología , Relaciones Madre-Hijo , Adulto , Niño , Preescolar , Comunicación , Trastornos de Alimentación y de la Ingestión de Alimentos/complicaciones , Femenino , Humanos , Lactante , Trastornos del Lenguaje/complicaciones , Masculino , Madres , Análisis MultivarianteRESUMEN
INTRODUCTION: In Europe, helplines have become a common counselling service for men and women who are seeking advice for sexual problems. Despite this, relatively few peer-reviewed reports on this subject have been published in the last decade. AIM: To investigate the range of sexual concerns reported by users of an Italian helpline and to describe the differences, if any, between male and female callers; to identify the overlap among sexual difficulties and the associations between the variables of the study. METHODS: The study included selected records of the calls received during the 3-year period between 2006 and 2008 (n = 944). Data were analysed using descriptive statistics and bivariate analysis. RESULTS: Users were more often male (62.2%), aged between 26 and 35 years, who had not sought any previous help. The most frequently reported male sexual difficulties were erectile dysfunction (ED) and premature ejaculation, while the majority of female callers reported vaginismus and orgasmic disorder (OD). We found an association between desire disorder (DD) and ED in men (41.7%), and between OD and DD in women (36.8%). CONCLUSIONS: Telephone counselling is an important and effective resource to elicit requests that otherwise might remain hidden; therefore, it can be a useful link between the health-care system and callers. This is true mainly for men. The next step could be to establish a quality management instrument to investigate whether users find the service helpful.
Asunto(s)
Consejo , Líneas Directas/estadística & datos numéricos , Aceptación de la Atención de Salud/estadística & datos numéricos , Disfunciones Sexuales Fisiológicas/terapia , Disfunciones Sexuales Psicológicas/terapia , Adulto , Distribución por Edad , Anciano , Femenino , Humanos , Italia , Libido , Masculino , Persona de Mediana Edad , Adulto JovenRESUMEN
OBJECTIVE: This study investigates affective and sexual dimensions in partners involved as caregivers of Alzheimer dementia (AD) subjects. A negative correlation between burden of the caregiver and sexual-affective quality of life was assumed. DESIGN AND METHODS: Hundred participants with AD partner (33 male, 67 female), aged between 55 and 85 years were recruited and data were collected from the Caregiver Burden Inventory scale and a semi-structured interview that included demographic information, medical history, relationship and sexual satisfaction, and current sexual function. AD group was compared with a control group (CG) (N=100) matched for age, sex, education and marital status on measures of the semi-structured interview. Data were analysed using frequency count, univariate analysis (chi-squared and ANOVA) and bivariate correlation. RESULTS: The findings revealed that mean burden level was 31.59 (SD 19.51). A difference between experimental and CGs was found for sexual and affective marital satisfaction (p<0.05). The same variables showed a rather negative correlation with total burden levels (r=-0.374, p<0.001; r=-0.448, p<0.001).
Asunto(s)
Enfermedad de Alzheimer/psicología , Cuidadores/psicología , Conducta Sexual , Esposos/psicología , Anciano , Anciano de 80 o más Años , Costo de Enfermedad , Femenino , Humanos , Relaciones Interpersonales , Masculino , Persona de Mediana Edad , Satisfacción Personal , Psicometría , Calidad de VidaRESUMEN
The aim of this study was to check the occurrence of actinosporean stages of Myxozoan parasites of oligochaetes in the Nera River basin (Central Italy). The investigation was conducted near twelve trout farms (rainbow and brown trout) along the Nera River and in the littoral of the Piediluco Lake. Four actinosporean types, belonging to the collective groups aurantiactinomyxon, triactinomyxon, raabeia and echinactinomyxon, were detected in some of the biotopes investigated (Piediluco Lake and Sordo River). Differential diagnosis, carried out on a sub-sample of spores, showed a complete fitting with forms previously described in literature, with the exception of the triactinomyxon type.
Asunto(s)
Cnidarios/crecimiento & desarrollo , Oligoquetos/parasitología , Ríos/parasitología , Animales , Acuicultura , Italia , Oocistos/ultraestructura , Especificidad de la Especie , TruchaRESUMEN
Organ transplantation has become the treatment of choice for a number of life-threatening childhood illnesses. Our review of the literature on the psychiatric aspects of organ transplantation in children and adolescents suggests that transplant programs routinely use psychosocial evaluations as a component of their assessment and to screen transplant recipients. This study explores 5 psychiatric issues raised by paediatric transplantation: 1) the role of family; 2) children's and adolescents' perception of illness; 3) pretransplant evaluation of a child's psychological state and environment; 4) the wait; 5) long-term effects. We conclude with recommendations for further research and the development of standardized assessment designed for the pediatric population.
Asunto(s)
Trasplante de Órganos/psicología , Adolescente , Niño , Familia , Hospitalización , Humanos , Trasplante de Órganos/rehabilitaciónRESUMEN
Annulotomy is a mandatory step to perform intradiscal decompression to resolve a disco radicular conflict. However, this manoeuvre can lead to post surgical complications such as vertebral instability and back pain. Coblation assisted microdiscectomy (CAM procedure) allows a quoted removal of disc without anulus damage.
Asunto(s)
Dolor de Espalda/prevención & control , Ablación por Catéter/métodos , Descompresión Quirúrgica/métodos , Discectomía Percutánea/métodos , Desplazamiento del Disco Intervertebral/cirugía , Vértebras Lumbares/cirugía , Microdisección/métodos , Dolor de Espalda/etiología , Humanos , Desplazamiento del Disco Intervertebral/complicaciones , Procedimientos Quirúrgicos Mínimamente Invasivos/métodos , Resultado del TratamientoRESUMEN
Aim of the study was (1) to evaluate sensorimotor development of children with autism in comparison with that of children with developmental delay, (2) to verify the possible unevenness of the developmental profiles through correlations amongst domains and between domains and chronological age. 46 children with autism were compared with 45 children with developmental delay. Mean chronological age was 3.7 yr. in children with autism and 3.6 yr. in children with mental retardation. Mean mental age was 1.3 yr. in children with autism and 1.1 yr. in children with developmental delay. Ordinal scales of Uzgiris-Hunt show that the two groups score significantly differently on the scales of Object Permanence, Means-Ends, Operational Causality, and Spatial Relations and that scores were higher for the children with autism. The comparison made between the developmental levels of each group indicate that the sensorimotor profile in children with developmental delay is fairly homogeneous, while it appears uneven in autistic children, for whom Object Permanence appears to be the most advanced skill, Verbal and Gestural Imitation and Schemes for Relating to Objects the lowest. The results are in keeping with the assumption that the pivotal defect of autism is a deficit in social interactive skills.
Asunto(s)
Trastorno Autístico/epidemiología , Discapacidades del Desarrollo/epidemiología , Trastornos de la Destreza Motora/diagnóstico , Trastornos de la Destreza Motora/epidemiología , Trastornos de la Percepción/diagnóstico , Trastornos de la Percepción/epidemiología , Percepción Espacial/fisiología , Encuestas y Cuestionarios , Percepción Visual , Niño , Preescolar , Comorbilidad , Femenino , Humanos , Conducta Imitativa , Relaciones Interpersonales , Masculino , Índice de Severidad de la Enfermedad , Conducta VerbalRESUMEN
A possible functional role of inducible isoform of nitric oxide synthase (iNOS) was explored in vitro on the motility of mouse distal colon. Using an isotonic - non-isovolumic technique, peristaltic activity and video images of the external wall of colonic segments were recorded before and after addition to the medium of Aminoguanidine (AG) and N-(3-(aminomethyl)benzyl) acetamidine (W1400) [10(-7) M-10(-4) M], two iNOS inhibitors. AG and W1400 induced an hyperexcitability of visceral smooth muscle characterised by an increase of basal tone and spontaneous phasic activity. As a consequence of these effects, the peristaltic activity declined and disappeared at the highest concentrations. These findings indicated a removal of inhibitory action performed by NO synthesised by iNOS in the colonic segment. The implications of results are discussed in term of tonic relaxation of intestinal smooth muscle to allow intraluminal content accommodation.
Asunto(s)
Colon/enzimología , Motilidad Gastrointestinal/fisiología , Músculo Liso/enzimología , Óxido Nítrico Sintasa/metabolismo , Amidinas/farmacología , Animales , Bencilaminas/farmacología , Inhibidores Enzimáticos/farmacología , Guanidinas/farmacología , Ratones , Ratones Endogámicos C57BL , Óxido Nítrico/metabolismo , Óxido Nítrico Sintasa/antagonistas & inhibidores , Óxido Nítrico Sintasa de Tipo IIRESUMEN
The effects of the cannabinoid receptor agonist Win 55,212-2 and of the competitive cannabinoid receptor antagonist SR 141716A on the electrically-evoked peristalsis of isolated distal colon of mouse were studied. Intraluminal pressure, longitudinal displacement, ejected fluid volume and changes in morphology of external intestinal wall were simultaneously recorded in the pre-drug period and in presence of Win 55,212-2 alone or in combination with SR 141716A. In the pre-drug period (control), peristaltic activity was characterised by regular, monophasic waves and the intraluminal content propelled towards anterograde (oro-aboral) direction with a propulsion velocity of 1.25 +/- 0.1 mm x s(-1). Pressure and shortening waves showed a peak amplitude of 2.44 +/- 0.32 kPa and 1.8 +/- 0.72 mm, respectively. The mean amount of fluid volume ejected during each contraction was 80 +/- 12.6 microl. The addition of Win 55,212-2 [10(-7)-10(-4) M] to the organ bath determined a dose-related attenuation of peristaltic activity consequent to the decrease of circular and longitudinal muscle strength. The decrease of contractile activity was followed by dose-dependent decrease of the amount of fluid ejected during peristalsis. The effects of Win 55,212-2 [10(-7)-10(-5) M] were prevented by SR 141716A, indicating the presence of cannabinoid CB1 receptors in the mouse distal colon. SR 141716A alone enhanced both tonic and phasic motor activities in the colonic longitudinal smooth muscle, suggesting that CB1 receptor antagonists could act either through antagonising the effect of endogenous CB1 receptor agonist or by an agonist effect on these receptors. The present results further support the hypothesis that cannabinoids perform a neuromodulatory role in various tracts of gastrointestinal system and first demonstrate their action also in the distal colon of rodents.
Asunto(s)
Cannabinoides/farmacología , Colon/fisiología , Morfolinas/farmacología , Naftalenos/farmacología , Peristaltismo/efectos de los fármacos , Piperidinas/farmacología , Pirazoles/farmacología , Animales , Benzoxazinas , Cannabinoides/antagonistas & inhibidores , Colon/citología , Colon/efectos de los fármacos , Interacciones Farmacológicas , Estimulación Eléctrica , Potenciales Evocados/efectos de los fármacos , Potenciales Evocados/fisiología , Técnicas In Vitro , Masculino , Ratones , Ratones Endogámicos ICR , Músculo Liso/citología , Músculo Liso/efectos de los fármacos , Músculo Liso/fisiología , RimonabantRESUMEN
The effects of chronic (26 weeks) ethanol consumption on cardiac muscle contractility in Sardinian alcohol-preferring drinkers (sP-D) and Sardinian alcohol-preferring naive (sP-N) rats were investigated. Experiments were carried out 1 week after ethanol administration ceased. Length-tension and force-frequency responses in left ventricular papillary muscles from both sP-D and sP-N rats were recorded in vitro. Papillary muscles were gradually stretched in steps of 5% of the reference (initial) length (L(r)) from 100 to 130% L(r). In sP-D rats, length-tension relationships showed a significant reduction in active tension: at optimal length for maximum active tension (130% L(r)), the developed force value (1.38 +/- 0.36 mN/mg, dry tissue) was 54% lower than that found in sP-N rats (3.16 +/- 0.6 mN/mg, dry tissue). In sP-D papillary muscles, a decrease in contractile behaviour was also observed in force-frequency responses (0.03-120 pulse/min), when compared with sP-N rats; developed force was found to be reduced by about 2.5 times. These results indicate that long-term ethanol consumption impairs the mechanical performance of sP papillary muscle, inducing a negative inotropic effect.
Asunto(s)
Depresores del Sistema Nervioso Central/farmacología , Etanol/farmacología , Contracción Muscular/efectos de los fármacos , Músculos Papilares/efectos de los fármacos , Consumo de Bebidas Alcohólicas/genética , Animales , Depresión Química , Estimulación Eléctrica , Masculino , Contracción Muscular/fisiología , Músculos Papilares/fisiología , RatasAsunto(s)
Infección Hospitalaria/prevención & control , Control de Infecciones/organización & administración , Enfermedades por Prión/prevención & control , Antisepsia , Síndrome de Creutzfeldt-Jakob/prevención & control , Síndrome de Creutzfeldt-Jakob/transmisión , Contaminación de Medicamentos , Contaminación de Equipos , Humanos , Enfermedad Iatrogénica/prevención & control , Italia , Grupo de Atención al Paciente , Enfermedades por Prión/embriología , Esterilización , Instrumentos Quirúrgicos , Trasplante/efectos adversos , Precauciones UniversalesRESUMEN
The immunity against poliomyelitis in 1000 subjects 13-14 years old was evaluated. Neutralizing antibodies against poliovirus type 1, 2 and 3 were detected in 97.6%, 95.8% and 70% of samples, respectively. 3/1000 (0.3%) subjects were simultaneously seronegative to the three types. WHO does not suggest a protective level of International Units (IU), but our data indicate that such level is 0.45 IU for polio type 1, 0.65 IU for the type 2 and 0.138 for the type 3. A booster dose of vaccine in adolescence to ensure personal and herd immunity is recommended.
Asunto(s)
Anticuerpos Antivirales/sangre , Poliomielitis/inmunología , Poliovirus/inmunología , Adolescente , Humanos , Inmunización Secundaria , Poliomielitis/prevención & control , Ciudad de RomaRESUMEN
Centenarians, particularly healthy centenarians, constitute the example of successful aging and the study of their immune status can help to define the endpoint of the changes occurring throughout life. We characterized T cell clones (TCC) of two healthy centenarians, studying their phenotypes and production of representative Th1 and Th2 cytokines (IFN-gamma and IL-4) and compared them with TCC obtained by three young normal subjects; in all 180TCC were analyzed. In young donors, 35TCC were CD4+, 56CD8+ and 2 were alpha beta +CD4-CD8- (double negative). In centenarians, we obtained 46CD4+TCC, 38CD8+, 2CD4+CD8+ (double positive) and 1 gamma delta + double negative. Of the young subjects' TCC, 71% produced IFN-gamma but no IL-4 (Th1 pattern) and this prevalence decreased to 39% in TCC from the centenarians. The number of clones showing the opposite Th2 pattern was similar in young and aged donors (3 out of 93TCC and 2 out of 87TCC, respectively). The intermediate profile of TCC producing both IL-4 and IFN-gamma (Th0) was found in 25.8% of clones from young people, but it almost doubled to 58.6% in centenarians. The analysis shows that the Th profiles of CD8+TCC is nearly superimposable in the two groups, whereas a major shift from a Th1 to a Th0 pattern is presented by CD4+TCC. The balance provided by a majority of CD4+TCC showing a Th0 pattern may ensure both humoral and cell-mediated defences. In CD8+TCC, however, a Th1 pattern still is present, possibly for efficient generation of cytotoxic responses. These findings should be extended by studying other centenarians and elderly subjects.
Asunto(s)
Linfocitos T CD4-Positivos/inmunología , Interferón gamma/biosíntesis , Interleucina-4/biosíntesis , Longevidad/inmunología , Anciano , Anciano de 80 o más Años , Linfocitos T CD4-Positivos/metabolismo , Células Clonales , Femenino , Humanos , Inmunofenotipificación , MasculinoRESUMEN
The effect of excitatory amino acids (EAA) on phosphatidylinositol (PI) turnover in human cerebral cortical slices was investigated. Trans-1-aminocyclopentane-1,3-dicarboxylic acid (ACPD) increased inositol phosphate (IP) formation in the 1-1000 microM range. Quisqualic acid (QA) was maximally effective at 10-100 microM, showing an inverse correlation between concentration and effect in the 100-1000 microM range. The glutamate metabotropic receptor antagonist 2-amino-3-phosphonopropionic acid (AP3), the ionotropic non-NMDA receptor antagonist 6-cyano-7-nitroquinoxaline-2,3-dione (CNQX) and the NMDA channel blocker dizolcipine (MK-801) failed to prevent the PI response to ACPD (1000 microM). However, CNQX (100 microM) modified the concentration-response curve of QA reducing the effect of QA 10 microM by approx. 50% and enhancing that of QA 1000 microM by 2-fold. In addition, CNQX (100 microM) together with MK-801 (100 microM) unmasked the ability of L-glutamate (L-GLU) 3000 microM to stimulate PI turnover. The effect of alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) on the EAA-induced PI turnover was also studied. AMPA (0.1-1 microM) potentiated the response to submaximal (30 microM) ACPD and (1 microM) QA concentrations. However, higher AMPA concentrations (10 microM) failed to synergize with ACPD 30 microM and, in addition, inhibited the PI turnover maximally stimulated by QA 10 microM. These results further support the presence of the glutamate metabotropic receptor in the human neocortex. In addition, they show the occurrence of a concentration-related dual interaction between AMPA and glutamate metabotropic receptor activation in the IP formation in this brain area.
Asunto(s)
Corteza Cerebral/efectos de los fármacos , Fosfatidilinositoles/metabolismo , Receptores AMPA/fisiología , Receptores de Glutamato Metabotrópico/metabolismo , Transducción de Señal/efectos de los fármacos , 6-Ciano 7-nitroquinoxalina 2,3-diona/farmacología , Adolescente , Adulto , Anciano , Calcimicina/farmacología , Corteza Cerebral/metabolismo , Niño , Cicloleucina/análogos & derivados , Cicloleucina/farmacología , Maleato de Dizocilpina/farmacología , Femenino , Ácido Glutámico/farmacología , Humanos , Masculino , Persona de Mediana Edad , N-Metilaspartato/farmacología , Ácido Quiscuálico/farmacología , Receptores AMPA/efectos de los fármacos , Transducción de Señal/fisiología , Tetrodotoxina/farmacología , Ácido alfa-Amino-3-hidroxi-5-metil-4-isoxazol Propiónico/farmacologíaRESUMEN
The authors present a series of 47 patients with craniopharyngiomas treated by stereotaxy in the past 15 years. There was no mortality nor immediate postoperative morbidity in the treatment of the cystic portion of the neoplasm. Intracavitary colloidal yttrium (90Y) was extremely effective in obtaining long-lasting disappearance of craniopharyngioma cysts. In children, yttrium worsened panhypopituitarism, while it was well tolerated by teenagers and adults. Craniopharyngiomas are often mixed (solid-cystic) and the majority of cases have a predominant cystic portion, where stereotaxy is a valid alternative to open surgery, which presents a high morbidity and mortality.
Asunto(s)
Craneofaringioma/cirugía , Neoplasias Hipofisarias/cirugía , Adolescente , Adulto , Anciano , Bleomicina/efectos adversos , Bleomicina/uso terapéutico , Niño , Preescolar , Terapia Combinada , Craneofaringioma/diagnóstico , Humanos , Radioisótopos de Yodo/uso terapéutico , Imagen por Resonancia Magnética , Persona de Mediana Edad , Neoplasias Hipofisarias/diagnóstico , Técnicas Estereotáxicas , Tomografía Computarizada por Rayos X , Radioisótopos de Itrio/efectos adversos , Radioisótopos de Itrio/uso terapéuticoRESUMEN
The noradrenergic modulation of endogenous gamma-aminobutyric acid (GABA) outflow from slices and synaptosomes prepared from human cerebral cortex biopsies has been studied. GABA outflow was responsive to depolarizing stimuli such as ouabain and high potassium. Basal GABA outflow in slices, but not in synaptosomes, appeared to be largely dependent upon neuronal activity, being prevented by tetrodotoxin (TTX). 10 mM K(+)-evoked outflow in synaptosomes also proved to be TTX sensitive. Norepinephrine (NE) concentration dependently increased basal GABA outflow both in slices and synaptosomes. This effect was alpha 1-adrenoreceptor-mediated because it was prevented by a selective antagonist of the alpha 1-adrenoreceptor class (prazosin) but not by the alpha 2 antagonist idazoxan. However, an alpha 2-mediated inhibitory modulation was also present in the preparations used, since (1) in slices, NE significantly inhibited GABA outflow in the presence of prazosin; (2) in synaptosomes, NE significantly inhibited 10 mM K(+)-evoked outflow in the presence of prazosin. Both of these effects were prevented by idazoxan. No beta-adrenoreceptor modulation could be demonstrated. A comparison between species was also conducted. The response to ouabain and to TTX proved similar in human, rat and guinea-pig cerebral cortex. In the most simple tissue preparation used (synaptosomes), a close similarity between the three species could be observed. In all species, NE stimulated basal GABA outflow, an effect prevented by prazosin. This suggests a predominant alpha 1-adrenoreceptor-mediated stimulatory effect. In a more complex preparation (slices), differences between species could be demonstrated.(ABSTRACT TRUNCATED AT 250 WORDS)
Asunto(s)
Agonistas alfa-Adrenérgicos/farmacología , Agonistas Adrenérgicos beta/farmacología , Corteza Cerebral/metabolismo , Norepinefrina/farmacología , Sinaptosomas/metabolismo , Ácido gamma-Aminobutírico/metabolismo , Animales , Corteza Cerebral/efectos de los fármacos , Dioxanos/farmacología , Relación Dosis-Respuesta a Droga , Cobayas , Humanos , Idazoxan , Técnicas In Vitro , Isoproterenol/farmacología , Cinética , Ouabaína/farmacología , Fenilefrina/farmacología , Potasio/farmacología , Prazosina/farmacología , Ratas , Especificidad de la Especie , Sinaptosomas/efectos de los fármacos , Tetrodotoxina/farmacologíaRESUMEN
A case of solitary schwannoma and one of solitary neurofibroma originating from the spinal accessory nerve in the posterior triangle of the neck are described. Location of such neoplasms in this region is exceptional. The authors emphasize the importance of accurately enucleating the mass; when it is impossible to preserve the continuity of the neural pathway, nerve repair should be considered.