SciELO - Scientific Electronic Library Online

 
vol.82 issue1The effects of concurrent cognitive tasks on postural sway in healthy subjectsExperimental study on the effects of bismuth subgallate on the inflammatory process and angiogenesis of the oral mucosa author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Brazilian Journal of Otorhinolaryngology

Print version ISSN 1808-8694On-line version ISSN 1808-8686

Abstract

COGO, Lícia Assunção et al. Morphological analysis of the vestibular system of guinea pigs poisoned by organophosphate. Braz. j. otorhinolaryngol. [online]. 2016, vol.82, n.1, pp.11-16. ISSN 1808-8694.  https://doi.org/10.1016/j.bjorl.2015.10.001.

INTRODUCTION:

The vestibular system is responsible for body balance. There are substances that damage it, causing dizziness; these are termed vestibulotoxic substances. Agrochemicals have been investigated for ototoxicity because of studies that identified dizziness as a recurrent symptom among rural workers' complaints.

OBJECTIVE:

To histopathologically evaluate the vestibular system in guinea pigs exposed to an organophosphate, and to identify the drug's effects on this system.

METHODS:

Experimental clinical study. Eighteen guinea pigs were used; six of them poisoned with the organophosphate chlorpyrifos at doses of 0.5 mg/kg/day and seven of them at 1 mg/kg/day; and a control group of five guinea pigs was exposed to distilled water, all for 10 consecutive days. Later, ciliary tufts of saccule and utricle maculae were counted by scanning electron microscopy.

RESULTS:

Comparing the groups, a one-way ANOVA test for the variable "saccule" ( p = 0.0569) and a Kruskal-Wallis test for the variable "utricle" ( p = 0.8958) were performed, revealing no difference among groups in both variables.

CONCLUSION:

The histopathologic analysis of the vestibular system of guinea pigs exposed to an organophosphate showed no difference in the amount of ciliary tufts of saccule and utricle maculae at the doses tested, although the result for the variable "saccule" was considered borderline, showing a trend for significance.

Keywords : Postural balance; Vestibule labyrinth; Insecticides organophosphate; Pesticides; Toxicity.

        · abstract in Portuguese     · text in English | Portuguese     · English ( pdf ) | Portuguese ( pdf )