Modulating parameters of excitability during and after transcranial direct current stimulation of the human motor cortex

Weak transcranial direct current stimulation (tDCS) of the human motor cortex results in excitability shifts which occur during and after stimulation. These excitability shifts are polarity-specific with anodal tDCS enhancing excitability, and cathodal reducing it. To explore the origin of this excitability modulation in more detail, we measured the input–output curve and motor thresholds as global parameters of cortico-spinal excitability, and determined intracortical inhibition and facilitation, as well as facilitatory indirect wave (I-wave) interactions. Measurements were performed during short-term tDCS, which elicits no after-effects, and during other tDCS protocols which do elicit short- and long-lasting after-effects. Resting and active motor thresholds remained stable during and after tDCS. The slope of the input–output curve was increased by anodal tDCS and decreased by cathodal tDCS. Anodal tDCS of the primary motor cortex reduced intracortical inhibition and enhanced facilitation after tDCS but not during tDCS. Cathodal tDCS reduced facilitation during, and additionally increased inhibition after its administration. During tDCS, I-wave facilitation was not influenced but, for the after-effects, anodal tDCS increased I-wave facilitation, while cathodal tDCS had only minor effects. These results suggest that the effect of tDCS on cortico-spinal excitability during a short period of stimulation (which does not induce after-effects) primarily depends on subthreshold resting membrane potential changes, which are able to modulate the input-output curve, but not motor thresholds. In contrast, the after-effects of tDCS are due to shifts in intracortical inhibition and facilitation, and at least partly also to facilitatory I-wave interaction, which is controlled by synaptic activity.     

Adequacy and support of physiological functions in the acutely ill cirrhotic patient

The cirrhotic condition is characterized by a series of changes in physiological functions and of subclinical alterations that imply an abnormal and fragile adaptive pattern with reduced resistance to superimposed distress. In the care of the critically ill cirrhotic patient, the supportive measures aimed at maintaining physiological stability through the control of such debilitating factors have a key role and are not secondary in importance to the more obvious measures needed to treat clinically evident and specific alterations or complications. The relationship between hepatic malfunction and the development of these physiological abnormalities is not fully understood. Our knowledge of the problem, however, has been recently improved and the need for supportive measures motivated by a series of notions on cardiorespiratory and metabolic abnormalities and interactions in hepatic decompensation.

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Resumen La condición cirrótica se caracteriza por una serie de cambios en las funciones fisiológicas y por alteraciones subclinicas que implican un patrón de adaptación anormal y fragil de resistencia reducida al estrés. Estas incluyen disfunción respiratoria con tendencia a la hipoxemia arterial en presencia de elevados indices cardiacos, una situatión crónica de hiperdinamismo cardiovascular pero con precaria eficacia miocárdica y latente riesgo de falla de alto débito, y cambios metabólicos que se traducen en un estado de fallas multisistémicas interrelacionadas características del cirrótico. En el cuidado del paciente cirrótico en estado crítico, las medidas de soporte orientadas al mantenimiento de la estabilidad fisiológica mediante el control de tales factores debilitantes tienen una importancia capital y no son secundarias frente a aquellas muy obvias que se requieren para tratar alteraciones o complicaciones específicas y clínicamente evidentes. La relación entre la disfunción hepática y el desarrollo de las mencionadas anormalidades fisiológicas no está totalmente aclarada, sin embargo, el estado de nuestro conocimiento sobre el problema ha sido enriquecido recientemente y se ha fortalecido la necesidad de establecer medidas de soporte por una serie de nociones relativas a las anormalidades e interacciones cardiorrespiratorias y metabólicas de la descompensación hepática.

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Résumé La cirrhose est caractérisée par des séries de variations des fonctions physiologiques et de modifications cliniques qui impliquent des modalités d'adaptation anormale et fragile se traduisant par une résistance réduite à l'état de détresse ou peut se trouver le cirrhotique. Des mesures appropriées pour maintenir la stabilité physiologique ont un rôle principal en présence de ces facteurs défavorables. Elles ne doivent pas être considérées comme moins importantes que les mesures essentielles qui sont nécessaires pour traiter les complications et les modifications cliniques spécifiques. La relation entre l'altération des fonctions du foie et le développement des anomalies physiologiques précitées n'est pas parfaitement élucidée, cependant, nos connaissances de ce problème ont été récemment améliorées et le besoin de mesures adéquates de soutien est devenu manifeste en raison de séries acquises de notions concernant les anomalies cardio-respiratoires et métaboliques ainsi que les interactions de la décompensation hépatique.

     

Variation of therapeutic response in Parkinson''s disease: a retrospective study

A retrospective study of variations of therapeutic response (dyskinesia and on-off phenomenon) in Parkinson's disease was conducted on 278 patients treated with levodopa for at least 6 months and hospitalized at National Neurological Institute "C. Besta" of Milan between 1974 and 1984. Variations of therapeutic response (TRV) were present in 105 of 278 patients; in this group, age at illness onset was significantly lower, while duration of levodopa treatment and also duration of illness were longer than in the group of patients without TRV. Multiple logistic regression analysis showed that the most important variables were age at illness onset and duration of treatment, but they were only modestly predictive. Other factors connected with progression of disease must also contribute to the TRV.     

Diabetic maculopathy induced by vitreo-macular traction: evaluation by optical coherence tomography (OCT)

Aim: To evaluate the role and efficacy of optical coherence tomography (OCT) in the evaluation of diabetic maculopathy induced by vitreo-retinal traction. Methods: 12 patients affected by diabetic maculopathy induced by vitreo-retinal traction were examined using biomicroscopy with a three-mirror contact lens, fluorescein angiography (FA) and OCT scanning in order to identify the presence of a vitreomacular traction. Results: OCT revealed two patterns of maculopathy which were characterised by a thickening of the superior profile of the OCT tomogram or by the disappearance and inversion of the physiologic foveal depression respectively. Conclusions: OCT may be useful in the characterisation and monitoring of diabetic maculopathy induced by vitreo-retinal traction. This revised version was published online in July 2006 with corrections to the Cover Date.     

Familial syringomyelia

Summary The clinical and neurological features of four siblings (2 , 2 ) affected by syringomyelia are described. A fifth sister was affected by an acoustic neurinoma. Since neither parent showed signs of syringomyelia, this is considered to be a datum substantiating the dysembryogenetic theory of the syringomyelia syndrome.We are grateful to Dr. M. Savoiardo for his many suggestions and for his interpretation of radiological features. We should like to thank Dr. L. De Lorenzi for allowing us to publish details about patients.     

DSM-III mental disorders in general medical sector: a follow-up and incidence study over a two-year period

Summary In three general medical settings (general practice, hospital medical wards and emergency rooms) about 20% of the adult attenders had a DSM-III mental disorder, mainly in the area of affective and anxious disorders. Some of these disorders were quite severe. Of those cases reassessed 1 year and 2 years after the first interview, less than a quarter reached a no-diagnosis status. The chronicity of most cases dependent on the interplay not only of either relapse or duration of the main disorder but also of comorbidity and incidence of new disorders. A high incidence of more transient disorders in subjects who were well at first assessment was also found.     

Conservative surgery for Stage I ovarian carcinoma in women of childbearing age

Objective To assess the results of a policy of tailored conservative surgical management for young women with stage I ovarian carcinomas.
Design Retrospective study.
Participants Ninety-nine women aged 40 years or younger who underwent either primary surgery in our department or were referred after primary surgery performed elsewhere.
Methods Of the 99 women in our study, 56 underwent fertility-sparing surgery and 43 more radical surgery. Minimal requirements for conservative management were adequate staging and complete information about the therapeutic options. Factors important in the choice of the treatment were, age, wish to preserve fertility, histologic type and grade, and the stage of the tumour.
Results Conservative treatment was conducted in 84% of nulliparous and in 33% of parous women; 62% of grade 1 tumours, 48% of grade 2, and 50% of grade 3 were treated conservatively. With a median follow up of seven years, we observed five recurrences (9%) of carcinoma in women treated conservatively and five (12%) in those treated more radically. Two women (one in each treatment arm) were saved after recurrence. Two recurrences after conservative surgery involved the residual ovary (3.6%). Two women developed borderline tumour in the contralateral ovary and both were treated by surgery.
Conclusion After adequate staging and accurate information is given to the patient, conservative treatment may be safe in some women with early ovarian cancer. The risk of recurrence in the contralateral ovary is low. Conservative surgery may be also considered in some Stage I grade 3 tumours and in some women with stage IC tumours.     

Exposure to mercury during the first six months via human milk and vaccines: modifying risk factors

Breastfeeding is the best natural protection infants have against morbidity and mortality, and the development of safe and effective vaccines has made it possible to immunize children against infectious disease. Both of these mechanisms for ensuring good health in children may be compromised by contact with mercury (Hg). Maternal exposure to environmental Hg during pregnancy can predispose nursing children to neurodevelopmental disorders. Despite the World Health Organization assurance that thimerosal-preserved vaccines are safe to use in infants, the United States, the European Union, and dozens of other countries have eliminated thimerosal as a vaccine preservative and stopped the immunization of children with such vaccines. Because of the increase in environmental pollution and the need to produce cheap and safe vaccines, there is a need to address the uncertainty of vaccine-ethylmercury risk of toxicity and Hg exposure during breastfeeding.     

Advantages of multidisciplinary management of bile duct injuries occurring during cholecystectomy

BACKGROUND: The aim of the present study was to highlight the advantages of treatment of bile duct injury (BDI) occurring during cholecystectomy on the basis of a multidisciplinary cooperation of expert surgeons, radiologists, and endoscopists. METHODS: Sixty-six patients had major BDIs or short- or long-term failures of repair. BDI was diagnosed intraoperatively in 27 patients (40.9%) and postoperatively in 39 (59.1%) patients. Among referred patients, 30 had complications from bile leak, 15 from obstructive jaundice, and 20 from recurrent cholangitis. Two patients died from sepsis after delayed referral before repair was attempted. Eleven additional patients had minor BDIs with bile leak both with and without choleperitoneum. RESULTS: Of patients with major BDI, surgical repair was performed in 41 (64.1%). Postsurgical morbidity rate was 15.8%, and there was no mortality. The rate of excellent or good results after surgical repair was 78.0% (32 of 41 patients), and this increased to 87.8% (36 of 41 patients) by continuing treatment with stenting in postsurgical strictures. Biliary stenting alone was performed in 23 patients (35.9%), with excellent or good results in 17 (73.9%). More than 200 endoscopic and percutaneous procedures were performed for initial assessment, treatment of sepsis, nonsurgical repair, contribution to repair, and follow-up. Patients with minor BDIs underwent various combinations of surgical and endoscopic or percutaneous treatments, always with good results. CONCLUSIONS: A multidisciplinary approach was of paramount importance in many phases of treatment of BDI: initial assessment, treatment of secondary complications, resolution of sepsis, percutaneous stenting before surgical repair, dilatation of strictures after repair, final treatment in patients not repaired surgically, and follow-up.     

Beyond C4d: Other Complement-Related Diagnostic Approaches to Antibody-Mediated Rejection

Complement is a multifunctional system of receptors and regulators as well as effector molecules. Both the pathogenic and diagnostic power of complement is based on the capacity of the complement system to amplify innate and adaptive immunity. This amplification is accomplished through two strategies: (1) enzymatic reactions in the complement cascade, and (2) stimulation of leukocytes, platelets and parenchymal cells through specific receptors or receptor-independent pore formation. The mechanisms by which complement mediates and modifies nonspecific inflammation, antibody-mediated injury and T-cell responses are of particular significance to the pathogenesis of transplant rejection. Understanding the mechanisms by which complement integrates the interactions of leukocytes, platelets and parenchymal cells offers opportunities to further refine the diagnosis of rejection.