Sampling reflex as a new manometric marker in the diagnosis of defecation disorders: systematic review

Introduction: Distension of the rectum wall and subsequent momentary relaxation of the internal anal sphincter (IAS) trigger a reflex called the rectoanal inhibitory reflex (RAIR). This same rectal distension causes a reflex contraction of the external anal sphincter (EAS), responsible for conscious continence called rectoanal excitatory reflex (RAER). This set of reflexes are named sampling reflex. Objectives: The sampling reflex is necessary to initiate defecation or flatulence. The objective of this study is to evaluate the sampling reflex and its practical applicability as a manometric marker of the main defecation disorders. Methodology: This review followed the Preferred Reporting Items for Systematic reviews and Meta-Analysis (PRISMA) items. The development method consisted of searching for articles in the research platforms BVS, PubMed, Cochrane Library, SciELO and ScienceDirect and for the selection of articles the Rayyan Platform was used. The articles resulting from the search strategies were added to the platform and five collaborators were invited for the blind selection. Finally, 6 articles were included in the final review. Results: An intact sampling reflex allows the individual to facilitate discrimination between flatus and stool and to choose whether to discharge or retain rectal contents. On the other hand, an impaired sampling reflex can predispose an individual to incontinence. Therefore, it was observed that patients with defecation disorders had an impaired sampling reflex, since it was found that constipated patients have incomplete opening of the IAS, lower amplitude of RAIR and increase of RAER. Most incontinent patients present a failure in the recruitment of the EAS, a decrease in the RAER and an increase in the RAIR, in duration and amplitude. (AU)

Tempo de trânsito oral na demência de Alzheimer / Oral transit time in Alzheimer's disease

RESUMO Objetivo Avaliar o tempo de trânsito oral de alimento na consistência pudim, nos diferentes estágios da demência de Alzheimer. Métodos Estudo de caráter descritivo e observacional do tipo transversal, com uma amostra de 34 idosos com idade entre 65 e 98 anos, com demência de Alzheimer em diferentes estágios. Os participantes foram observados por avaliação de videofluoroscopia da deglutição, enquanto ingeriam alimento na consistência pudim, usando o programa de cronometragem Kinovea. Os dados foram analisados estatisticamente, em nível de significância de 5%. Resultados Os participantes com o Clinical Dementia Rating CDR 3 apresentaram maior tempo de trânsito oral, quando comparados àqueles com CDR 1, média de 3,09s (desvio padrão = 0,91) e 1,17s (desvio padrão = 1,10), respectivamente. Participantes na faixa etária de 90a 100 anos apresentaram maior tempo de trânsito oral do que os mais jovens, entre 60 e 79 anos, média de 3,90s e 1,28s. Conclusão Indivíduos com demência e idade avançadas apresentam tempo de trânsito oral aumentado para alimento na consistência pudim, devendo ser alvo de atenção de familiares e cuidadores.

ABSTRACT Purpose Evaluate oral transit time (OTT) with pudding consistency at the different stages of Alzheimer's disease (AD). Methods Descriptive, cross-sectional, observational study conducted with a sample of 34 elderly aged 65-98 years, with AD at different stages. Participants were observed using videofluoroscopy of swallowing while ingesting pudding consistency, using the Kinovea timing program. Data were statistically analyzed at 5% significance level. Results Participants with Clinical Dementia Rating - CDR 3 presented longer OTT compared with those with CDR 1, with means of 3.09 s (SD = 0.91) and 1.17 s (SD = 1.10), respectively. Individuals aged 90-100 years presented longer OTT than those aged 60-79 years, means of 3.90 s and 1.28 s, respectively. Conclusion Individuals with dementia and advanced aged present longer OTT for pudding consistency and should receive special attention from family members and caregivers.