Structure of the rat tracheal mucosa after chronic intermittent hypoxia or chronic hyperbaric oxygen therapy.

Objective: This paper is aimed at identifying putative morphological changes induced in the rat's tracheal mucosa by chronic hyperbaric oxygen (HBO) treatment or chronic intermittent hypoxia (CIH).

Study Design: Tracheal samples were obtained from three groups of 11, 12 and 13 adult Wistar rats. The first group was submitted to 20 sessions of 100 min-long HBO treatment; the second group was submitted to eucapnic CIH for 35 days; and the third group was not submitted to any CIH or HBO therapy.

Relationship between menopause and periodontal disease: a cross-sectional study in a Portuguese population.

Background: Menopause is associated with important systemic and oral changes. Many researchers have tried to evaluate the influence of hormonal changes associated with menopause in the periodontium, however results are contradictory.

Objective: Evaluate the possible effects of menopause on the severity of periodontal disease and tooth loss, by considering several general, oral and periodontal parameters.

Histomorphometric evaluation of the small coronary arteries in rats exposed to industrial noise.

Unlabelled: Morphological changes induced by industrial noise (IN) have been experimentally observed in several organs. Histological observations of the coronary arteries showed prominent perivascular tissue and fibrosis among IN-exposed rats. The effects on the small arteries are unknown.

Industrial noise and tooth wear - experimental study.

Unlabelled: Tooth wear is a complex multifactorial process that involves the loss of hard dental tissue. Parafunctional habits have been mentioned as a self-destructive process caused by stress, which results in hyperactivity of masticatory muscles. Stress manifests itself through teeth grinding, leading to progressive teeth wear.

Histomorphometric evaluation of the coronary artery vessels in rats submitted to industrial noise.

Introduction: Industrial noise (IN) is characterized by high intensity and a wide spectrum of wavelengths that induce physical vibration on the body structures. This effect, resulting from the low-frequency sound waves, can lead to pathological alterations in the extracellular matrix with an abnormal proliferation of collagen and development of tissue fibrosis, in the absence of an inflammatory process.

Objective: The aim of this study was to evaluate the modifications of the arterial coronary vessels in Wistar rats submitted to IN.

Myocardial fibrosis in rats exposed to low frequency noise.

Unlabelled: Low frequency noise (LFN) characterized by large pressure amplitude (> or =90 dB SPL) and low frequency bands (< or =500 Hz) can lead to structural and ultrastructural modifications in the extracellular matrix of several tissues, with an abnormal proliferation of collagen and development of fibrosis. It is not known whether LFN induces similar structural alterations in the ventricular myocardium of rats.

Objective: The aim of this study was to evaluate and measure the myocardial fibrosis induced by LFN.

Structure of the rat nasal mucosa after acute and chronic hyperbaric oxygen therapy.

Objective: We aimed at the identification of putative morphologic changes induced in the rat nasal mucosa by acute or chronic hyperbaric oxygen (HBO2) treatment.

Study Design: Nasal samples were obtained from three groups of eight adult Wistar rats. The first group was submitted to 30 daily sessions of 100-minute-long HBO2 treatments at 2.

Chronic hyperbaric oxygen therapy and the human nasal mucosa: increased thickness of epithelium basement membrane and moderate neutrophilic infiltration.

Objective: We aimed to identify potential morphologic changes induced in the nasal mucosa by hyperbaric oxygen (HBO) treatment.

Study Design: Biopsies were obtained from two groups of 9 individuals: the first group had a diagnosis of tinnitus and was submitted to 15 sessions of 100 min-long HBO treatments, and the latter group consisted of healthy volunteers not submitted to HBO therapy.

Methods: Small biopsies of the anterior portion of the lower nasal turbinate were collected with the help of a Hartmann forceps under direct visual inspection.

Noise-induced gastric lesions: a light and scanning electron microscopy study of the alterations of the rat gastric mucosa induced by low frequency noise.

Introduction: Exposure to low frequency noise (LFN) can lead to vibroacoustic disease (VAD), recognized as a systemic disease with lesions in a broad spectrum of organs. Although gastrointestinal complaints are common among individuals exposed to noise, only few studies tried to evaluate the digestive lesions. The authors performed this study in order to investigate gastric lesions in an animal model of VAD.