O esvaziamento gástrico e a insuficiência renal crônica

Eunice Sizue Hirata; Maria Aparecida Mesquita; Gentil Alves Filho; Cecilia Hirata Terra

doi:10.1590/S0034-70942007000400011

Artigo de Revisão

O esvaziamento gástrico e a insuficiência renal crônica

Gastric emptying and chronic renal failure

Eunice Sizue Hirata; Maria Aparecida Mesquita; Gentil Alves Filho; Cecilia Hirata Terra

http://dx.doi.org/10.1590/S0034-70942007000400011 Braz J Anesthesiol, vol.57, n4, p.421-430, 2007

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Resumo

INTRODUÇÃO E OBJETIVOS: A primeira referência de retardo no esvaziamento gástrico (EG) foi feita por Grodstein em 1979. Outros estudos foram publicados posteriormente, nem sempre confirmando essa observação. A importância do EG em anestesia pode ser resumida em um de seus aspectos principais, o jejum pré-operatório. O retardo no esvaziamento pode causar estase e aumentar o risco de vômito e aspiração pulmonar. A possibilidade de existir retardo do esvaziamento em urêmicos é atraente. Queixas dispépticas são comuns nesses pacientes e poderiam ser explicadas pela dificuldade de esvaziamento gástrico. Apesar das evidências, a literatura é muito controversa nesse aspecto. Não há consenso quanto aos resultados obtidos. Diferenças no método de estudo utilizado poderiam explicar esses resultados, observados em estudos clínicos e experimentais. O objetivo desse estudo foi rever alguns aspectos importantes da síndrome dispéptica em pacientes com insuficiência renal crônica (IRC) terminal, com ênfase no retardo do EG. CONTEÚDO: Serão abordados os aspectos básicos relacionados com a fisiologia do EG, os métodos mais empregados para o estudo do EG, a síndrome dispéptica e a uremia e o esvaziamento gástrico na insuficiência renal crônica. CONCLUSÕES: O EG é um processo fisiológico complexo de transferência do alimento do estômago para o duodeno, cujos mecanismos ainda não estão devidamente esclarecidos. A cintilografia, utilizando refeições acrescidas de radiofármacos, é o exame mais utilizado para o estudo do EG. Uma porcentagem expressiva de pacientes com IRC terminal apresenta retardo no EG. Possivelmente outros mecanismos, além da uremia que participa da função motora gástrica, estão envolvidos nesta disfunção.

Palavras-chave

DOENÇAS, Renal, FISIOLOGIA, Gastrintestinal

Abstract

BACKGROUND AND OBJECTIVES: The first reference to delayed gastric emptying (GE) was made by Grodstein in 1979. Other studies have since been published, not always confirming his work. The importance of GE in anesthesia can be resumed by one of its main aspects, preoperative fasting. Delayed gastric emptying can lead to stasis and increase the risk of vomiting and aspiration. The possibility that uremic patients present delayed gastric emptying is fascinating. Gastric complaints are common in this patient population, and could be explained by the difficulty to empty the stomach. Despite the evidence, there is controversy in the literature regarding this subject. There is no consensus regarding the results. Differences in the methods of the studies could explain the results obtained in clinical and experimental trials. The objective of this study was to review a few important aspects of the dyspeptic syndrome in patients with chronic renal failure (CRF), emphasizing the delayed GE. CONTENTS: The basic aspects of the physiology of GE, methods used more often to study GE, dyspeptic syndrome and uremia, and gastric emptying in chronic renal failure will be discussed. CONCLUSIONS: Gastric emptying is a complex physiological process that transfers food from the stomach to the duodenum, whose mechanisms are yet to be fully characterized. Scintigraphy, using meals with radiolabelled drugs, is the exam used more often to study GE. An expressive percentage of the patients with end-stage renal disease also present delayed GE. It is possible that other mechanisms, besides uremia, involved in gastric motor function also play a role in this dysfunction.

Keywords

DISEASES, PHYSIOLOGY, Gastrointestinal

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O esvaziamento gástrico e a insuficiência renal crônica

Gastric emptying and chronic renal failure

Eunice Sizue Hirata; Maria Aparecida Mesquita; Gentil Alves Filho; Cecilia Hirata Terra

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