Fistules perilymphatiques post-traumatiques

Introduction : La fistule péri-lymphatique (FPL) post-traumatique réalise une communication anormale entre le compartiment liquidien périlymphatique et l’oreille moyenne. Son diagnostic est souvent difficile du fait du tableau clinique parfois incomplet. L’imagerie est indispensable afin d’étayer le diagnostic. Le traitement repose sur la chirurgie.Matériel et méthodes : Il s’agit d’une étude rétrospective à propos de 13 patients colligés sur une période de 13 ans (1996-2008). Un examen ORL complet, une audiométrie et une imagerie (tomodensitométrie des rochers) ont été réalisés dans tous les cas. Tous les patients ont bénéficié d’un traitement médical et ont été opérés sous anesthésie générale. Le contrôle ultérieur était clinique, audiométrique et radiologique avec un recul moyen de 22 mois.Résultats : L’âge moyen était de 29 ans (20-47 ans) et le sex-ratio 3,33. Les signes fonctionnels étaient essentiellement représentés par l’hypoacousie dans 12 cas (92,3%), les vertiges dans 11 cas (84,6%) et les acouphènes dans 4 cas (30,8%). L’écoulement d’un liquide eau de roche par l’oreille a été rapporté par 2 patients (15,4%). L’examen clinique trouvait un nystagmus spontané battant du côté controlatéral au traumatisme chez un seul patient, et un signe de la fistule positif chez 2 patients (15,4%). A l’audiométrie, 9 patients (69,3%) avaient une surdité de perception ou mixte dont 6 cas de cophose. Une surdité de transmission a été objectivée dans 3 cas. Un patient avait une audition subnormale. La TDM des rochers a montré une fracture extra-labyrinthique dans 5 cas (38,5%) et une fracture trans-labyrinthique ou mixte dans 6 cas (46,2%). Un pneumolabyrinthe a été constaté chez 5 patients (38,5%). Une exploration chirurgicale a été indiquée chez tous les patients. En per-opératoire, une FPL a été mise en évidence dans tous les cas. Le siège de la fistule était au niveau du promontoire et/ou au niveau des fenêtres. Un colmatage de la fistule a été réalisé dans tous les cas. Les matériaux utilisés étaient essentiellement de l’aponévrose temporale superficielle, du périchondre tragal et de la graisse. En post-opératoire, les vertiges se sont améliorés chez 9 patients parmi les 11 vertigineux (81,8%). L’audition était améliorée chez 2 patients parmi les 9 ayant une surdité de perception ou mixte (18,2%).Conclusion : La fistule périlymphatique post-traumatique est de diagnostic difficile. Celui-ci est étayé par un faisceau d’arguments cliniques et paracliniques et n’est confirmé qu’en per-opératoire. L’indication d’une exploration chirurgicale et son délai dépendent essentiellement de la symptomatologie clinique et de son évolution dans le temps.Mots-clés : fistule périlymphatique, traumatisme, vertige, surdité, tomodensitométrie, chirurgieIntroduction: Post-traumatic perilymphatic fistula (PLF) realises an abnormal communication between the perilymphatic fluid compartment and the middle ear. Its diagnosis is often difficult because the clinical presentation is sometimes incomplete. Imaging is essential in order to support the diagnosis. Treatment is based on surgery.Materials and Methods: We carry a retrospective study about 13 patients collected over a period of 13 years (1996-2008). A complete ENT examination, audiometry and imaging (petrous CT scan) were performed in all cases. All patients received medical treatment and were operated under general anaesthesia. Subsequent control was clinical, radiological and audiometric with a mean period of 22 months.Results: Mean age was 29 years (20-47 years) and sex ratio 3.33. Symptoms were mainly hearing loss in 12 cases (92.3%), vertigo in 11 cases (84.6%) and tinnitus in 4 cases (30.8%). Flow of liquid from the ear was reported by 2 patients (15.4%). Clinical examination showed spontaneous nystagmus beating to the contralateral side of the trauma in one patient, and a positive sign of the fistula in 2 patients (15.4%). At audiometry, 9 patients (69.3%) had sensorineural or mixed deafness, of which 6 cases of cophosis. Transmission deafness was found in 3 cases. One patient had a subnormal hearing. Petrous CT scan showed extra-labyrinthic fracture in 5 cases (38.5%) and trans-labyrinthic or mixed fracture in 6 cases (46.2%). A pneumolabyrinth was found in 5 patients (38.5%). Surgical exploration was indicated in all patients. PLF was found in all cases. The localization of the fistula was at the promontory and / or at the windows. Blockage of the fistula was achieved in all cases. Materials used were essentially superficial temporal fascia, tragal perichondrium and fat. Postoperatively, vertigo improved in 9 patients among 11 (81.8%). Hearing was improved in 2 patients among the 9 having sensorineural or mixed deafness (18.2%).Conclusion: Post-traumatic perilymphatic fistula trauma is difficult to diagnose. This is supported by a beam of clinical and paraclinical arguments, and is confirmed intraoperatively. The indication for surgical exploration and its delay depend mainly on clinical symptomatology and its evolution over time.Keywords: perilymphatic fistula, trauma, vertigo, deafness, CT scan, surger

Fistules perilymphatiques post-traumatiques a propos de 13 cas

Introduction : La fistule péri-lymphatique (fPL) post-traumatique réalise une communication anormale entre le compartiment liquidien périlymphatique et l’oreille moyenne. Son diagnostic est souvent difficile du fait du tableau clinique parfois incomplet. L’imagerie est indispensable afin d’étayer le diagnostic. Le traitement repose sur la chirurgie.Patients et méthode : : il s’agit d’une étude rétrospective à propos de 13 patients colligés sur une période de 13 ans (1996-2008). un examen ORL complet, une audiométrie et une imagerie (tomodensitométrie des rochers) ont été réalisés dans tous les cas. Tous les patients ont bénéficié d’un traitement médical et ont été opérés sous anesthésie générale. Le contrôle ultérieur était clinique, audiométrique et radiologique avec un recul moyen de 22 mois.Résultats :L’âge moyen était de 29 ans (20-47 ans) et le sex-ratio 3,33. Les signes fonctionnels étaient essentiellement représentés par l’hypoacousie dans 12 cas (92,3%), les vertiges dans 11 cas (84,6%) et les acouphènes dans 4 cas (30,8%). L’écoulement d’un liquide eau de roche par l’oreille a été rapporté par 2 patients (15,4%). L’examen clinique trouvait un nystagmus spontané battant du côté controlatéral au traumatisme chez un seul patient, et un signe de la fistule positif chez 2 patients (15,4%). A l’audiométrie, 9 patients (69,3%) avaient une surdité de perception ou mixte dont 6 cas de cophose. une surdité de transmission a été objectivée dans 3 cas. un patient avait une audition subnormale. La TdM des rochers a montré une fracture extra-labyrinthique dans 5 cas (38,5%) et une fracture trans-labyrinthique ou mixte dans 6 cas (46,2%). un pneumolabyrinthe a été constaté chez 5 patients (38,5%). une exploration chirurgicale a été indiquée chez tous les patients. En per-opératoire, une fPL a été mise en évidence dans tous les cas. Le siège de la fistule était au niveau du promontoire et/ou au niveau des fenêtres. un colmatage de la fistule a été réalisé dans tous les cas. Les matériaux utilisés étaient essentiellement de l’aponévrose temporale superficielle, du périchondre tragal et de la graisse. En post-opératoire, les vertiges se sont améliorés chez  patients parmi les 11 vertigineux (81,8%). L’audition était améliorée chez 2 patients parmi les 9 ayant une surdité de perception ou mixte (18,2%).Conclusion : La fistule périlymphatique post-traumatique est de diagnostic difficile. Celui-ci est étayé par un faisceau d’arguments cliniques et paracliniques et n’est confirmé qu’en per-opératoire. L’indication d’une exploration chirurgicale et son délai dépendent essentiellement de la symptomatologie clinique et de son évolution dans le temps.Mots clés : fistule périlymphatique, traumatisme, vertige, surdité, tomodensitométrie, chirurgieObjective : Post-traumatic perilymphatic fistula (PLf) realises an abnormal communication between the perilymphatic fluid compartment and the middle ear. its diagnosis is often difficult because the clinical presentation is sometimes incomplete. imaging is essential in order to support the diagnosis. Treatment is based on surgery.Patients and methods : We carry a retrospective study about 13 patients collected over a period of 13 years (1996- 2008). A complete ENT examination, audiometry and imaging (petrous CT scan) were performed in all cases. All patients received medical treatment and were operated under general anaesthesia. Subsequent control was clinical, radiological and audiometric with a mean period of 22 months.Mean age was 29 years (20-47 years) and sex ratio 3.33. Symptoms were mainly hearing loss in 12 cases (92.3%), vertigo in 11 cases (84.6%) and tinnitus in 4 cases (30.8%). flow of liquid from the ear was reported by 2 patients (15.4%). Clinical examination showed spontaneous nystagmus beating to the contralateral side of the trauma in one patient, and a positive sign of the fistula in 2 patients (15.4%). At audiometry, 9 patients (69.3%) had sensorineural or mixed deafness, of which 6 cases of cophosis. Transmission deafness was found in 3 cases. One patient had a subnormal hearing. Petrous CT scan showed extra-labyrinthic fracture in 5 cases (38.5%) and trans-labyrinthic or mixed fracture in 6 cases (46.2%). A pneumolabyrinth was found in 5 patients (38.5%). Surgical exploration was indicated in all patients. PLf was found in all cases. The localization of the fistula was at the promontory and / or at the windows. Blockage of the fistula was achieved in all cases. Materials used were essentially superficial temporal fascia, tragal perichondrium and fat. Postoperatively, vertigo improved in 9 patients among 11 (81.8%). Hearing was improved in 2 patients among the 9 having sensorineural or mixed deafness (18.2%).Conclusion: TPost-traumatic perilymphatic fistula trauma is difficult to diagnose. This is supported by a beam of clinical and paraclinical arguments, and is confirmed intraoperatively. The indication for surgical exploration and its delay depend mainly on clinical symptomatology and its evolution over time.Keywords : perilymphatic fistula, trauma, vertigo, deafness, CT scan, surger

Facile preparation of N-S co-doped graphene quantum dots (GQDs) from graphite waste for efficient humidity sensing

In this work, graphene quantum dots (GQDs) were prepared from Graphitic waste. The resulting GQDs were evaluated for the potential application for resistive humidity sensors. The resistive humidity sensors were fabricated on the pre-patterned interdigital ITO electrodes using the three different concentrations (2.5, 5.0, and 10 mg) of GQDs in DMF. The GQDs films were deposited using the spin coating technique. The GQDs (10 mg/ml) based impedance sensors showed good sensitivity and lowered hysteresis as compared to the other ratios (2.5 and 5 mg) of the GQDs. The maximum calculated hysteresis of the GQDs (10 mg) based humidity sensor is around 2.2 % at 30%RH, and the minimum calculated hysteresis of the GQDs (10 mg/ml) based humidity sensor is approximately 0.79 % at 60 %RH. The response and recovery time found to be 15 s and 55 s, respectively. The interesting humidity-dependent resistive properties of these prepared GQDs make them promising for potential application in humidity sensing.Scopu

Modulation of Sn concentration in ZnO nanorod array: intensification on the conductivity and humidity sensing properties

Tin (Sn)-doped zinc oxide (ZnO) nanorod arrays (TZO) were synthesized onto aluminum-doped ZnO-coated glass substrate via a facile sonicated sol–gel immersion method for humidity sensor applications. These nanorod arrays were grown at different Sn concentrations ranging from 0.6 to 3 at.%. X-ray diffraction patterns showed that the deposited TZO arrays exhibited a wurtzite structure. The stress/strain condition of the ZnO film metamorphosed from tensile strain/compressive stress to compressive strain/tensile stress when the Sn concentrations increased. Results indicated that 1 at.% Sn doping of TZO, which has the lowest tensile stress of 0.14 GPa, generated the highest conductivity of 1.31 S cm− 1. In addition, 1 at.% Sn doping of TZO possessed superior sensitivity to a humidity of 3.36. These results revealed that the optimum performance of a humidity-sensing device can be obtained mainly by controlling the amount of extrinsic element in a ZnO film

Synthesis of in situ photoinduced halloysite-polypyrrole@silver nanocomposite for the potential application in humidity sensors

Halloysite-polypyrrole-silver nanocomposite has been prepared via in situ photopolymerizations of pyrrole in the presence of silanized halloysite and silver nitrate as a photoinitiator. The halloysite nanoclay (HNT) was modified using the hydrogen donor silane coupling agent (DMA) in order to provide anchoring sites for the polypyrrole/silver composite (PPy@Ag). The mass loadings for both PPy and Ag have been estimated to be 21 and 26 wt%, respectively. The anchored Ag particles were found in the metallic state. The resulting PPy@Ag-modified silanized HNT has been evaluated for the potential application for impedance humidity sensors. HNT-DMA-PPy@Ag nanocomposite with different weight % of PPy@Ag (0.25 wt%, 0.5 wt%, and 1 wt%) was deposited on the pre-patterned interdigital Indium Tin Oxide (ITO) electrodes by spin coating technique. The addition of Ag nanoparticles within the nanocomposite enhances the hydrophilicity of the sensing film, which improves the sensitivity of the humidity sensors. The HNT-DMA-PPy@Ag (0.5 wt%) nanocomposite-based impedance sensors showed good sensitivity and lowered hysteresis as compared to the other ratios of the composite. The maximum calculated hysteresis loss of the HNT-DMA-PPy@Ag (0.5 wt%)-based humidity sensor is around 4.5% at 80% RH (relative humidity), and the minimum hysteresis loss estimated to be 0.05% at 20% RH levels. The response and recovery time of HNT-DMA-PPy@Ag (0.5 wt%) nanocomposite-based impedance sensors were found to be 30 and 35 s, respectively. The interesting humidity-dependent impedance properties of this novel composite make it promising in humidity sensing.Scopu

Isolation, identification and characterization of a new lipolytic Pseudomonas sp., strain AHD-1, from Tunisian soil

International audienc

Isolation, identification and characterization of a new lipolytic Pseudomonas sp., strain AHD-1, from Tunisian soil

International audienc

Chemical Composition Analysis, Antioxidant, and Antibacterial Activities of Eggplant Leaves

Agricultural by-products represent one of the biggest pollutants for the environment, therefore, investigating new sources for the extraction of bioactive compounds is a topic of great interest for the entire scientific community. This work is aimed at studying the chemical composition (pigments, phenolics, volatile compounds) and biological activities (antioxidant and antimicrobial properties) of young and mature leaves of five eggplant cultivars (Solanum melongena L.) grown in Tunisia (Tizona, A1014, Nawel, A336, and Mirval). Pigment analysis showed no statistical variations between the two types of leaves, whereas higher levels of anthocyanins were recorded in young leaves of three out of five cultivars (24.7–52.8 mg 100 g−1). Total phenolic compounds (966.5–2072.6 mg 100 g−1) and o-diphenols (343.9–741.2 mg 100 g−1) contents varied significantly according to leaf age and cultivar. However, no statistically significant variation between young and mature leaves was found in flavonols and tannins content. As for volatile profiles, 62 constituents were characterized with non-terpene derivatives (52.0–61.6 %) and apocarotenes (19.9–35.6 %) as major chemical classes. Regarding the antioxidant activity, methanol extracts of Tizona cultivar mature leaves displayed important antiradical properties using DPPH, ABTS, and phosphomolybdenum assays (IC50 0.1, 0.2 and 0.01 mg mL−1, respectively). With regards to reducing power determination, the most active extract was obtained from mature A1014 leaves. Further, young Mirval leaves proved to be significantly active from a bactericidal point of view against Candida albicans and Staphylococcus aureus of 3.1 mg mL−1 and 0.2 mg mL−1 MBC, respectively. In conclusion, eggplant leaves are a noteworthy source of antioxidant and antimicrobial compounds with potential use in the pharmaceutical, the cosmetics and the food industries