Effects of 6-hydroxydopamine on pre- and post-junctional 5-HT1-like receptor-mediated responses in dog saphenous vein

Summary To investigate whether 5-HT₁-like receptor-mediated inhibition of adenosine 3 : 5-cyclic monophosphate (cyclic AMP) accumulation occurs in nerves or smooth muscle of saphenous vein, infusions of 6-hydroxydopamine (6-OHDA) were administered to dogs with the aim of inducing sympathetic nerve damage. The effects of 6-OHDA on other 5-HT₁-like receptor-mediated responses at the pre- and post-junctional level were investigated for comparison by studying 5-hydroxytryptamine (5-HT)-induced inhibition of ³H-noradrenaline release and contraction of smooth muscle respectively.Disruption of nerve function by 6-OHDA was revealed by the lack of catecholaminergic fluorescence and neurogenic contractile responses in saphenous veins from dogs treated with 6-OHDA. In addition, severe impairment of neuronal uptake mechanisms were apparent since basal efflux of ³H-noradrenaline, electrically-evoked release of ³H-noradrenaline and remaining ³H-noradrenaline content were considerably reduced. Some ³H-noradrenaline was taken up and released in 6-OHDA treated tissues which is consistent with the existence of nerve varicosities resistant to the present dosing regime of 6-OHDA, an observation substantiated by electron microscopy studies showing inconsistent lesions of nerve terminals.6-OHDA pre-treatment potentiated the smooth muscle contractile responses mediated by 5-HT₁-like receptors as well as potentiating 5-HT-evoked inhibition of prostaglandin E₂-stimulated cyclic AMP accumulation. It did not, however, affect 5-HT-induced inhibition of ³H-noradrenaline release. The present results suggest that inhibition of cyclic AMP accumulation by 5-HT occurs predominantly in smooth muscle. Correspondence to A. J. Kaumann at the above address     

Management of anorectal malformations during the newborn period

Anorectal malformations comprise a spectrum of disease. Some of these defects are minor, with an excellent functional prognosis. Others are complex and may be associated with other defects in the urinary tract that may risk the patient's life. The decision-making process for the management of a newborn with anorectal malformations is crucial; the timing and establishment of priorities are the key to success. Because the management of affected males and females differs significantly, they are discussed separately.

---

Resumen Las malformaciones anorrectales comprenden todo un espectro de enfermedad. Algunos de los defectos son de naturaleza menor, fáciles de tratar y tienen un excelente pronóstico funcional. Otros son complejos, su manejo es difícil, su pronóstico incierto y algunoas veces se ven asociados con otros defectos en el tracto urinario que significan riesgo para la vida del paciente. El proceso de toma de decisión en el manejo de un recién nacido con malformación anorrectal es crucial porque determina el futuro inmediato y lejano del niño. Las más importantes decisiones a tomar durante este período son las relativas a la necesidad de una colostomía y sí el paciente requiere una derivación urinaria o vaginal con el fin de prevenir sepsis o acidosis metabólica. La definición de prioridades y su programación son la clave del éxito. Puesto que el manejo de estos pacientes difiere significativamente en los niños y en las niñas, se discuten por separado en este informe.

---

Résumé Il existe une grande variété de malformations anorectales de l'enfant. Les malformations dites mineures sont faciles à réparer et leur pronostic est excellent. Parmi les variétés complexes, le traitement est difficile, le pronostic incertain, et parfois, lorsqu'il s'y associe des malformations urinaires, la vie de l'enfant est en jeu. De la décision thérapeutique, dépend étroitement le pronostic immédiat et tardif. Les problèmes essentiels concernent la décision de réaliser ou non une colostomie ou encore la nécessité de pratiquer une dérivation urinaire ou vaginale afin d'éviter une infection ou une acidose métabolique. Le traitement des malformations diffèrent naturellement entre le garçon et la fille et sera traité séparemment.

     

Immunohistochemical detection of p140trkA and p75LNGFR neurotrophin receptors in neuroblastoma

In neuroblastoma, high levels of mRNA for p14h ^trkA and p75 ^LNGFR neurotrophin receptors are predictive of favorable outcome. Their evaluation by Northern blot, however, requires substantial amounts of tissue and this prevents their routine evaluation as well as the possibility for multicenter studies to be easily carried out. In an attempt to overcome these limitations, the feasibility and reliability of determining both neurotrophin receptors on cryostat sections by immunohistochemistry were assessed, and these findings were compared to those obtained from Northern blot analysis. Primary tumor samples from 28 untreated patients at all stages were evaluated by using H10 anti-p140 ^trkA and ME20.4 anti-p75 ^LNGFR mAbs. Although weak, positiveimmunostaining was found in 9 of 28 tumors for p140 ^trkA and in 5 of 28 tumors for p75 ^LNGFR . As compared to Northern blot, the concordance rate was 79% (22 of 28 cases) for p140 ^trkA (p < 0.05) and 71% (20 of 28 cases) for p75 ^LNGFR (p < 0.05). No case negative for Northern blot was found to be positive with immunohistochemistry. Since only high mRNA levels for both receptors have been shown to be clinically relevant, their immunohistochemical detection, although less sensitive than Northern blot, can be just as sufficient and reliable as a prognostic tool, and possibly with a better cost-benefit ratio.     

Observations on the arterial baroreflex in neurally mediated vasodepressor syncope

The arterial baroreflex was studied in subjects who had recently had an episode of vasodepressor syncope. This was determined using 2–3 mcg/kg intravenous boluses of phenylephrine and assessing the bradycardic response. The values were measured in ms/mmHg and expressed as the angular coefficient of the regression line between the increase in R—R interval on the electrocardiograph and the systolic arterial pressure. In subjects examined immediately after the vasodepressor syncope episode the bradycardic response was much more marked than in controls (p < 0.01) and in the subjects themselves 6 months after the episode, provided that they were symptom-free (p < 0.01). It is concluded that in vasodepressor syncope there is a phase in which the baroreflex is highly sensitive and that this is due not to a lowering of the stimulation threshold but to a gain in the efferent arc, which explains a vagotonic response.     

Crossed aphasia. An update

The aim of this article is to present an update of a rare but interesting problem: crossed aphasia. This term indicates the presence of aphasia after unilateral cerebral lesion of the hemisphere ipsilateral to the patient's dominant hand. We report two cases, review the most relevant literature, and analyze clinical, neuroanatomical, and neurophysiological aspects, taking in consideration the various interpretations proposed to explain this unusual language disorder.     

Anastomosis

Esophageal anastomosis is still associated with a high rate of complications even though they have decreased considerably in recent years. Anastomotic leaks are more frequent in the neck than in the chest, and related mortality rate is not different. The leakage incidence does not depend on suture materials or on technical modalities used to perform the anastomosis. In fact, there is no difference between the leakage rate when comparing manual and mechanical anastomoses. The leak incidence after both mechanical and manual anastomoses is much higher in collective reviews than in reports coming from leading centers. Frequent esophageal surgeons can learn from their previous experience and therefore avoid technical errors, whereas casual esophageal surgeons do not have this opportunity. Performing an esophageal anastomosis is a technical matter, and suture healing is independent of the patient's biologic situation. Anastomotic fibrotic stricutures are frequent after both manual and mechanical anastomoses, and most can be avoided by meticulous suturing technique.

---

Resumen La anastomosis esofágica todavía se asocia con una elevada incidencia de complicaciones, a pesar de que éstas han descendido en forma considerable en los últimos años. Las fugas anastomóticas son más frecuentes en el cuello que en el tórax y las tasas de mortalidad no son diferentes. La rata de fuga anastomótica no depende de los materiales de sutura o de las modalidades técnicas que se utilicen para realizar la anastomosis. De hecho no hay diferencia en cuanto a la rata de fugas entre las anastomosis manuales y las mecánicas. La incidencia de fuga, tanto en las manuales como en las mecánicas, es bastante más alta en las revisiones colectivas que en los reportes emanados de los centros médicos de mayor importancia. Los cirujanos especialistas en esófago tienen la posibilidad de aprender de sus experiencias previas y con ello evitar los errores técnicos, en tanto que aquellos cirujanos ocasionales no la poseen. La realización de una anastomosis esofágica es un asunto técnico y la cicatrización de la sutura es independiente de la condición biológica del paciente. Las estrecheces fibróticas de las anastomosis son frecuentes luego de las anastomosis manuales, al igual que luego de las anastomosis mecánicas y la mayoría puede ser evitada mediante una técnica meticulosa.

---

Résumé Le taux de complications des anastomoses oesophagiennes, même s'il y en a moins ces dernières années, reste toujours élevé. La fréquence de fistules est plus grande quand l'anastomose est faite au cou par rapport au thorax, mais la mortalité n'en est pas très différente. L'incidence de fistules ne dépend ni du matériau de suture ni des modalités d'anastomoses utilisées. Il n'y a aucune différence lorsque les anastomoses manuelles sont comparées aux anastomoses méchaniques: L'incidence des fistules, que ce soit à la main ou à la machine est plus élevée dans les séries collectives par rapport à celle des centres spécialisés. Les chirurgiens qui font des anastomoses de façon régulière ont la possibilité de profiter de leur expérience et ainsi d'éviter les erreurs techniques, alors que le chirurgien occasionnel de l'oesophage n'a pas cette possibilité. L'anastomose oesophagienne est techniquement difficile et la cicatrisation est indépendante de l'état clinique et biologique du patient. Les sténoses fibreuses sont aussi fréquentes après les anastomoses manuelles qu'après les anastomoses méchaniques, mais la plupart peuvent être évitées par une technique méticuleuse.

     

Mesenteric cystic neoformations: Report of two cases

(Received for publication on Apr. 28, 1997; accepted on May 15, 1998)     

Adoptive Immunotherapy With Tumor-Infiltrating Lymphocytes and Subcutaneous Recombinant Interleukin-2 Plus Interferon Alfa-2a for Melanoma Patients With Nonresectable Distant Disease: A Phase I/II Pilot Trial

Background: On the basis of our previous experience, we designed this study to determine the activity and toxicity of outpatient treatment with autologous tumor-infiltrating lymphocytes (TIL) together with intermediate-dose recombinant interleukin-2 (rIL-2) and low-dose recombinant interferon alfa-2a (rIFN-2a), for patients with metastatic melanoma.Methods: Between April 1992 and October 1994, we processed 38 melanoma samples derived from 36 patients with metastases. Proliferative cultures of expanded lymphocytes (TIL) were infused only once into patients with metastatic melanoma. rIL-2 was administered subcutaneously for 1 month, starting on the day of TIL infusion, at an escalating dose of 6–18 × 10⁶ IU/m²/day for the first week and at the maximum-tolerated dose for the subsequent 3 weeks and then, after a 15-day interval, for 1 week/month for 3 months. rIFN-2a was administered subcutaneously at 3 × 10⁶ IU three times each week until progression.Results: Of 38 melanoma samples, 19 (50%) resulted in proliferative cultures and were infused. The median number of expanded lymphocytes was 18 × 10⁹ (range, 1–43 × 10⁹), and the median period of culture was 52 days (range, 45–60). rIL-2 was administered at doses ranging between 6 and 18 × 10⁶ IU/m²/day. Toxicity was mild or moderate, and no life-threatening side effects were encountered. Two of 19 treated patients experienced complete responses of their metastatic sites (soft tissue), 10 had stable disease, and 7 showed progressive disease. The response rate was 11% (95% confidence interval, 2–35%).Conclusions: Outpatient treatment with TIL plus rIL-2 and rIFN-2a is feasible, although, within the context of the small sample size, the activity of the combination was no different from the reported activity of any of the components used alone.     

Use of self-operated auditory prompts to decrease aberrant behaviors in students with moderate mental retardation

We examined the effectiveness of self-operated auditory prompts when used to decrease the off-task and aberrant behaviors of two students with moderate mental retardation. Its purpose was to determine if self-operated auditory prompts could be effectively used by these individuals to decrease their off-task and aberrant behaviors in work settings and during transitional times between settings. A multiple-probe across settings design with a reversal and replication was used to evaluate the effectiveness of the self-operated auditory prompting system on aberrant student behaviors in school and community settings. Previous findings were replicated in this study that demonstrate that stimulus control can be achieved through the use of self-operated auditory prompts, and demonstrates that these prompts can serve to occasion a decrease in aberrant behaviors when used by individuals with moderate mental retardation in school and community settings.