Acute physical and psychological stress effects on visceral hypersensitivity in male rat: role of central nucleus of the amygdala / Efeitos agudos do estresse físico e psicológico na hipersensibilidade visceral em rato macho: papel do núcleo central da amídala

ABSTRACT Objective: The aim of this study was to investigate the effects of acute physical and psychological stress and temporary central nucleus of the amygdala (CeA) block on stress-induced visceral hypersensitivity. Methods: Forty two male Wistar rats were used in this study. Animals were divided into 7 groups (n = 6); 1 - Control, 2 - physical stress, 3 - psychological stress, 4 - sham, 5 - lidocaine, 6 - lidocaine + physical stress and 7 - lidocaine + psychological stress. Stress induction was done using a communication box. Results: Abdominal withdrawal reflex (AWR) score was monitored one hour after stress exposure. AWR score significantly heightened at 20, 40 and 60 mmHg in the psychological stress group compared with control (p < 0.05), while, it was almost unchanged in other groups. This score was strikingly decreased at 20, 40 and 60 mmHg in lidocaine + psychological stress group compared with psychological stress with no tangible response on physical stress. Total stool weight was significantly increased in psychological stress group compared with control (0.72 ± 0.15, 0.1 ± 0.06 g) (p < 0.05), but it did not change in physical stress compared to control group (0.16 ± 0.12, 0.1 ± 0.06 g) (p < 0.05). Concomitant use of lidocaine with stress followed the same results in psychological groups (0.18 ± 0.2, 0.72 ± 0.15 g) (p < 0.05), while it did not have any effect on physical stress group (0.25 ± 0.1, 0.16 ± 0.12 g) (p < 0.05). Conclusions: Psychological stress could strongly affect visceral hypersensitivity. This effect is statistically comparable with physical stress. Temporary CeA block could also reduce visceral hypersensitivity post-acute psychological stress.

RESUMEN Objetivo: O objetivo desse estudo foi investigar os efeitos do estresse físico e psicológico agudo e bloqueio temporário do núcleo central da amídala (CeA) na hipersensibilidade visceral induzida por estresse. Métodos: Quarenta e dois ratos Wistar machos foram empregados nesse estudo. Os animais foram divididos em 7 grupos (n = 6): 1 - Controle, 2 - estresse físico, 3 - estresse psicológico, 4 - simulacro, 5 - lidocaína, 6 - lidocaína + estresse físico e 7 - lidocaína + estresse psicológico. A indução do estresse foi feita com o uso de uma caixa de comunicação. Resultados: O escore do reflexo de retirada abdominal (RRA) foi monitorado uma hora depois da exposição ao estresse. O escore RRA aumentou significativamente a 20, 40 e 60 mmHg no grupo de estresse psicológico versus controle (p < 0,05), enquanto que praticamente permaneceu inalterado nos demais grupos. Esse escore diminuiu drasticamente a 20, 40 e 60 mmHg no grupo de lidocaína + estresse psicológico versus estresse psicológico, sem resposta tangível no estresse físico. O peso total das fezes aumentou significativamente no grupo de estresse psicológico versus controle (0,72 ± 0,15, 0,1 ± 0,06 g) (p < 0,05), mas não houve mudança no grupo de estresse físico versus controle (0,16 ± 0,12, 0,1 ± 0,06 g) (p < 0,05). O uso simultâneo da lidocaína com o estresse acompanhou os mesmos resultados nos grupos psicológicos (0,18 ± 0,2, 0,72 ± 0,15 g) (p < 0,05), enquanto que não foi observado qualquer efeito no grupo de estresse físico (0,25 ± 0,1, 0,16 ± 0,12 g) (p < 0,05). Conclusões: O estresse psicológico pode afetar fortemente a hipersensibilidade visceral. Esse efeito é estatisticamente comparável com o estresse físico. Um bloqueio temporário do CeA também pode reduzir a hipersensibilidade visceral pós-estresse psicológico agudo.

An experimental study of artificial murine bladder reflex arc established by abdominal reflex / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>The neurogenic bladder dysfunction caused by spinal cord injury is difficult to treat clinically. The aim of this research was to establish an artificial bladder reflex arc in rats through abdominal reflex pathway above the level of spinal cord injury, reinnervate the neurogenic bladder and restore bladder micturition.</p><p><b>METHODS</b>The outcome was achieved by intradural microanastomosis of the right T13 ventral root to S2 ventral root with autogenous nerve grafting, leaving the right T13 dorsal root intact. Long-term function of the reflex arc was assessed from nerve electrophysiological data and intravesical pressure tests during 8 months postoperation. Horseradish peroxidase (HRP) tracing was performed to observe the effectiveness of the artificial reflex.</p><p><b>RESULTS</b>Single stimulus (3 mA, 0.3 ms pulses, 20 Hz, 5-second duration) on the right T13 dorsal root resulted in evoked action potentials, raised intravesical pressures and bladder smooth muscle, compound action potential recorded from the right vesical plexus before and after the spinal cord transaction injury between L5 and S4 segmental in 12 Sprague-Dawley rats. There were HRP labelled cells in T13 ventral horn on the experimental side and in the intermediolateral nucleus on both sides of the L6-S4 segments after HRP injection. There was no HRP labelled cell in T13 ventral horn on the control side.</p><p><b>CONCLUSION</b>Using the surviving somatic reflex above the level of spinal cord injury to reconstruct the bladder autonomous reflex arc by intradural microanastomosis of ventral root with a segment of autologous nerve grafting is practical in rats and may have clinical applications for humans.</p>

Swedish massage and abnormal reflexes of chidren with spastic cerbral palsy

Massage therapy is one of the most widely used complementary and alternative medicine therapies for children. This study was conducted to determine the effect of wedish massage on abnormal reflexes in children with spastic cerebral palsy [CP]. This study was a single blind clinical trial conducted on forty children with spastic CP who were recruited from clinics of the University of Social Welfare and Rehabilitation Sciences. They were randomly assigned to intervention and control groups. The routine occupational therapy [OT] techniques were performed during a 3 month-period in both groups. The intervention group also received Swedish massage for 30 minutes before every OT session. Primary, spinal, brain stem, midbrain, cortical and automatic reflexes were evaluated at the beginning of the study and 3 months later. The data analysis was done by parametric and nonparametric tests. Finally, thirteen subjects in the intervention group and 14 subjects in the control group were remained and studied. The average ages in the intervention and control groups were 49.5 and 42.1 months respectively. There were no statistically significant differences in abnormal reflexes in the intervention group in comparison to the control [P>0.05]. Adding Swedish massage to traditional OT techniques had no significant effects on abnormal reflexes in children with spastic cerebral palsy. Evidently more research is required in order to completely reject the effects of Swedish massage on abnormal reflexes of children with CP

A cicatriz umbilical e a neurologia / The umbilical scar and neurology

Em algumas situações específicas a cicatriz umbilical deve ser objeto de observação atenta por parte do neurologista: nas doenças geneticamente adquiridas; quando se desloca em resposta a dois reflexos -cutâneo abdominal superficial e cutâneo abdominal profundo - e na pesquisa do Sinal de Beevor. O movimento do umbigo também deve ser observado em doenças que cursam com dirtúrbios do movimento e como parte do exame do paciente em morte cerebral. Este artigo trata de como um pequeno acidente anatômico e cicatricial, situado no epicentro da parede abdominal, pode contribuir para o diagnóstico neurológico.

The umbilical scar must be an object of attentive observation by the neurologist in some specific situation: in the genetically trasmitted diseases, in the neurologic examination (when we valorize its displacement in the response to two reflexes - superficial abdominal cutaneous and deep abdominal cutaneous), and by the observation of the Beevor Sign. The navel's shift can also be seen in some diseases with movement disorder and in-patients with cerebral death. This article deals with how a small scar, a little anatomic accident situated in the middle of the abdominal wall, may contribute to the neurologic diagnosis.

Nueve reflejos primitivos en enfermos con síndrome de inmunodeficiencia adquirida (SIDA). Resultados de un estudio caso-control / Nine primitive reflexes in acquired immunodeficiency syndrome (AIDS) patients. Results of a case control study

En este estudio de casos y controles estimamos la frecuencia de nueve reflejos primitivos (RP) en un grupo de enfermos con AIDA sin enfermedades neurológicas previa. Setenta y ocho casos fueron evaluados y comparados con 81 controles seronegativos apareados por edad, sexo y grado de instrucción. Usamos un examen Mínimo del Estado Mental de Folstein (EMEM). 56 por ciento de los casos tuvo déficit cognoscitivo y reflejos primitivos. En general, los RP fueron entre 2-36 veces más frecuentes en los casos. Esta asociación fue más fuerte para los reflejos glabelar, de hociqueo y de Rossolimo. 92 por ciento de los casos tuvo = 2 RP. 8 por ciento de los controles tuvo hasta 2 RP (P < 0.0001; intervalo de confianza de 95 por ciento (IC 95 por ciento): 68-100 por ciento). En 39 de 43 casos en quienes se efectuó punción lumbar no fue posible aislar germen oportunista alguno. Estos resultados sugieren que los RP están asociados al deterioro neurocognoscitivo en enfermos con SIDA sin enfermedad neurológica previa. Hacen falta estudios con análisis multivariante en latinoamérica para identificar reflejos primitivos útiles como signos clínicos de disfunción neurocognoscitiva en la infección por el virus de inmunodeficiencia humana tipo 1 (VIH-1)