Can loud noise cause acoustic neuroma? Analysis of the INTERPHONE study in France

OBJECTIVES

To investigate possible associations between risk of acoustic neuroma and exposure to loud noise in leisure and occupational settings.

METHODS

A case-control study was conducted in France within the international INTERPHONE study. The cases were the 108 subjects diagnosed with acoustic neuroma between 1 June 2000 and 31 August 2003. Two controls per case were selected from the electoral rolls and individually matched for gender, age (5 years) and area (local authority district) of residence at the time of the case diagnosis. Multivariate analyses were conducted using conditional logistic regression. Adjustment was made for socioeconomic status.

RESULTS

Acoustic neuroma was found to be associated with loud noise exposure (odds ratio (OR) = 2.55; 95% CI 1.35 to 4.82), both in leisure settings, particularly when listening to loud music (OR = 3.88; 95% CI 1.48 to 10.17) and at work (OR = 2.26; 95% CI 1.08 to 4.72). This risk increased with exposure duration (>6 years' leisure exposure: OR = 3.15; 95% CI 1.07 to 9.24). Risk varied according to the type of noise (continuous or explosive vs intermittent).

CONCLUSION

The present results agree with other recent reports implicating loud noise in the risk of acoustic neuroma.

Plasma visfatin concentrations in subjects with type 1 diabetes mellitus

BACKGROUND/AIMS

Visfatin is a recently discovered adipokine, and its circulating concentrations have not been adequately studied in type 1 diabetes mellitus (DM). Therefore, this study was designed to examine plasma visfatin levels in type 1 diabetic patients and to determine the relationships between visfatin and duration of diabetes, body mass index, glycemic control, insulin dosage and lipid profile.

METHODS

Forty-eight patients with type 1 DM and 26 healthy controls were investigated.

RESULTS

Type 1 diabetic patients had significantly low visfatin levels compared with controls (18.8 +/- 1.7 vs. 20.2 +/- 0.3 ng/ml; p < 0.0001). Visfatin levels were comparable between patients with a short duration of diabetes (<10 years) and patients with a long duration of diabetes (>or=10 years) (18.9 +/- 1.7 vs. 18.2 +/- 2.0 ng/ml; p > 0.05). There was a significant correlation between visfatin and hemoglobin A1c (HbA1c) even after the adjustment for age, sex, body mass index and duration of diabetes (r = -0.48, p = 0.005) in the patient group. Multivariate analysis showed that significant determinants of visfatin concentrations were HbA1c and duration of diabetes (r(2) = 0.27).

CONCLUSION

These data emphasize that plasma visfatin concentrations are lower in patients with type 1 DM and related to glycemic control reflected by HbA1c.

The age- and gender-dependent effects of desflurane and sevoflurane on rat liver

OBJECTIVE

This study aimed to investigate the age- and gender-dependent effects of desflurane and sevoflurane on the liver.

MATERIAL AND METHOD

Upon the approval of ethics committee, 84 rats were divided into four groups as 21 young male, 21 young female, 21 old male, and 21 old female rats. Then, each group was further divided into three groups as desflurane, sevoflurane, and control groups. Maintaining the minimum alveolar concentration of 1, desflurane at 6vol% and sevoflurane at 2vol% in 6Lmin(-1) 100% O2 were administered for 2h in a transparent plastic container of 40cmx40cmx70cm. Each liver preparation was evaluated for hydropic degeneration, nuclear polymorphism, portal neutrophile infiltration, portal lymphocyte infiltration, and focal necrosis, and each preparation was assigned injury points of 0-3; thus, the number of histopathologically injured cases, total injury scores of each preparation, and the mean injury scores of each group were determined.

RESULTS

Desflurane and sevoflurane did not significantly increase hepatic injury in the young male rats, while both agents caused significantly more hepatic injury in the young female rats. In the old rats, both desflurane and sevoflurane inflicted more hepatic injury on both genders. In addition, desflurane caused more hepatic injury in the old female rats than in the young female or the old male rats.

CONCLUSION

Hepatic injury associated with desflurane and sevoflurane was mild to moderate, suggesting that both agents can be safely used in routine anaesthesia procedures.

Comparison of effects of anaesthesia with desflurane and enflurane on liver function

INTRODUCTION

Although most general anaesthesia procedures are performed without any complications, volatile agents may have adverse effects on various living systems. This study aimed to compare the effects of desflurane and enflurane on liver function.

METHODS

40 patients, who were in the ASA I-III risk groups and were planned to undergo head and neck surgery of at least three hours' duration, were randomly divided into two groups: the desflurane (Group D) and enflurane groups (Group E). Venous blood samples (5 ml) of the patients were obtained before anaesthesia induction, in the postoperative first hour and on the first and seventh days. The samples were centrifuged and then stored at -80 degrees Celsius until the determination of glutathione S-transferase (GST) levels. For maintenance of anaesthesia in Group D, desflurane (6 percent) was used, while in Group E, enflurane (1.2 percent) was used.

RESULTS

GST levels were significantly higher in Group E in the postoperative first hour (p-value is 0.002), and on the first day (p-value is 0.025) and seventh day (p-value is 0.035), although there were no differences preoperatively (p-value is more than 0.05). When postoperative levels were compared with preoperative levels, the postoperative GST levels of Group E were significantly higher (first hour [p-value is 0.008], first day [p-value is 0.010], seventh day [p-value is 0.038]).

CONCLUSION

Subclinical hepatic injury after anaesthesia continues to be an issue of interest, particularly with the development of new, more sensitive methods of measuring GST levels. The increase in GST concentration after anaesthesia is thought to be a result of reduced hepatic blood flow. This study has shown that desflurane has fewer effects than enflurane on liver function tests in lengthy operations of up to 330 minutes.

Calpain 10 gene single-nucleotide 44 polymorphism may have an influence on clinical and metabolic features in patients with polycystic ovary syndrome

AIM

This study was designed in order to examine the relationship between Calpain 10 [single-nucleotide polymorphism (SNP) 19,43,44,63] gene polymorphisms and clinical and hormonal characteristics in women with polycystic ovary syndrome (PCOS).

MATERIALS AND METHODS

One hundred and seven patients with PCOS and 114 healthy subjects were included in this study. Serum levels of sex steroids were measured for each individual. Insulin resistance (IR) was evaluated by the homeostasis model assessment (HOMA) and quantitative insulin-sensitivity check index (QUICKI) methods. Insulin and glucose responses to the oral glucose tolerance test (OGTT) were analyzed by calculating the areas under the curve for insulin (AUCI) and glucose by the trapezoidal methods.We used PCR and restriction fragment length polymorphism technique to examine Calpain 10 SNP 19, 43, 44, and 63 polymorphisms.

RESULTS

Allele distribution of Calpain 10 SNP 44 gene polymorphism was observed as significantly different between the groups. Calpain 10 SNP 44 TC genotype was found to be increased in PCOS subjects (69.15%) compared to the control subjects (50%). However, when compared to control subjects, patients with PCOS had similar Calpain 10 SNP 19, Calpain 10 SNP 43, and SNP 63 gene polymorphisms. When compared with normal Calpain 10 gene SNP 44 allele in PCOS subjects, subjects with PCOS having Calpain 10 gene SNP 44 allele polymorphism had higher free testosterone, androstenedione, DHEA-S, and fasting insulin levels. Also, PCOS women with Calpain 10 gene SNP 44 allele polymorphism had high Ferriman-Gallwey (F-G) score, acne, prevalence of menstrual disturbances, waist-hip ratio, HOMA-IR, AUCI levels and low QUICKI levels.

CONCLUSION

The findings show that Calpain 10 gene SNP 44 allele polymorphism may have a role in PCOS pathogenesis. However, larger-scale studies are needed in this field.

Atherogenic lipoprotein phenotype and LDL size and subclasses in women with gestational diabetes

AIMS

Women with gestational diabetes are more likely to develop Type 2 diabetes and cardiovascular disease after pregnancy; however, the exact nature of the lipid alterations present is not clear. In Mediterranean women with gestational diabetes, we measured low-density lipoprotein (LDL) size and all seven subclasses, as well as the 'atherogenic-lipoprotein phenotype'[ALP, e.g. concomitant presence of elevated triglycerides, reduced high-density lipoprotein (HDL)-cholesterol and increased small, dense LDL].

METHODS

In 27 women with gestational diabetes and 23 healthy pregnant women matched for age, weeks of gestation and body mass index, we measured plasma lipids and LDL size and subclasses by gradient gel electrophoresis between 24 and 28 weeks of gestation.

RESULTS

Although no significant differences were found in the concentrations of any of the plasma lipids, compared with control subjects women with gestational diabetes had lower LDL size (P = 0.0007) due to reduced LDL-I (P = 0.0074) and increased LDL-IVA (P = 0.0146) and -IVB (P < 0.0001) subclasses. Correlation analysis revealed that fasting glucose, homeostasis model assessment and glycated haemoglobin were inversely correlated with LDL-I and positively with LDL-IVA and -IVB (all P < 0.05). ALP due to high HDL-cholesterol levels was not seen in either group, whereas elevated small, dense LDL were more common in women with gestational diabetes than control subjects (33% vs. 4%, P = 0.0107).

CONCLUSIONS

Increased levels of small, dense LDL are common in Mediterranean women with gestational diabetes. Whether these findings affect the atherogenic process and clinical end-points in these women remains to be determined by future prospective studies.

Callosal branches of the anterior cerebral artery: an anatomical report

Although the morphology of the corpus callosum is well defined, the arterial supply of this structure has not been comprehensively studied. To elucidate this further, 40 cerebral hemispheres from 30 adult cadaveric brains were obtained. The anterior cerebral arteries were cannulated and injected with red latex. The following were observed and documented: (1) the number, diameter, and course of the arteries supplying the corpus callosum; (2) the territories vascularized by these arteries; (3) any variations of the callosal arteries. Short callosal arteries were present in 58 hemispheres (96.6%) and supplied the superficial surface of the corpus callosum along its midline and were a primary arterial source to this structure. Long callosal arteries were found in 28 hemispheres (46.6%) and contributed to the pial plexus. The cingulocallosal arteries were present in all hemispheres and supplied the corpus callosum, cingulate gyrus, and also contributed to the pericallosal pial plexus. The recurrent cingulocallosal arteries were present in 17 hemispheres (28.3%) and also contributed to the pericallosal pial plexus. The median callosal artery, an anatomical variation, was present in 10 brains (33.3%). This vessel supplied the corpus callosum and the cingulate gyrus. The aim of the present study was to provide a detailed description of the arteries supplying the corpus callosum for those who encounter these vessels radiologically or surgically.

Recurrence and Progression of T1G3 Transitional Cell Carcinoma of the Bladder Treated with Intravesical Bacillus Calmette-Guérin

OBJECTIVE

To examine the incidence of recurrence and progression in patients with stage T1, grade-3 carcinoma of the bladder treated with endovesical bacillus Calmette-Guérin (BCG) after complete transurethral resection.

MATERIAL AND METHODS

From May 1995 to June 2002, 937 patients with superficial bladder cancer underwent transurethral resection. 46 patients (4.9%) had T1G3 tumors. All patients received endovesical BCG therapy 2-3 weeks after transurethral resection, given in 6 sessions as weekly instillations of 120 ml Pasteur strain BCG in 50 ml saline. Success was defined by normal cytology and cystoscopy, and normal bladder biopsies. Recurrent tumors were resected and a second or third cycle of therapy was given according to pathological status. Progressive tumors were managed by radical cystectomy, radiotherapy and/or chemotherapy depending on the nature of the tumor or clinical status of the patient.

RESULTS

During follow-up 60.7% of the patients (28 of 46) remained tumor free after only 1 BCG cycle and 73.9% (34 of 46) after the third BCG cycle, and the bladder was preserved in all. Muscle-invasive progression was noted in 10 (21.7%) patients at the end of the BCG cycles. Radical cystectomy was done in 10 patients. The tumor-free survival rate of all patients including those who underwent cystectomy is 84.8% (39 of 46) with a median follow-up of 61 (range 39-118) months.

CONCLUSION

Adjuvant immunotherapy with BCG after complete transurethral resection of the bladder tumor represents a highly effective treatment for bladder preservation in stage pT1, grade-3 carcinoma of the bladder. pT1G3 tumors with early high-grade recurrence after failed immunotherapy should be regarded as candidates for early radical cystectomy.

Visfatin concentration is decreased in women with gestational diabetes mellitus in the third trimester

Our aim is to investigate visfatin concentration and its relationship to glycated hemoglobin (HbA1c), insulin resistance, lipid parameters, and neonatal birth weight in women with gestational diabetes mellitus (GDM). In our study group, there were 47 women with GDM and 31 women with normal glucose tolerance (NGT) between 33-39 weeks of gestation. Plasma visfatin levels were significantly decreased in pregnant women with GDM compared to those with NGT (p=0.001). Homeostasis model assessment-insulin resistance (HOMA-IR) levels were higher in the GDM group than in the NGT group (p=0.006). In all subjects, plasma visfatin levels were negatively correlated with HOMA-IR, post-prandial blood glucose, triglycerides, and VLDL cholesterol (p<0.05). We did not observe any statistically significant correlation between the plasma visfatin levels and the selected parameters in the GDM group, but in the NGT group plasma visfatin levels were negatively correlated with HOMA-IR (r=-0.36, p=0.04). There was no correlation between visfatin concentrations and fetal birth weight in either group (p>0.05). By regression analysis, having GDM was found to be the only significant determinant (t=3.5, p=0.001) of visfatin concentration (R=0.39, r2=0.15). We conclude that women with GDM have significantly decreased visfatin concentrations in the third trimester. Future studies are required to establish the exact role of visfatin in the pathogenesis of GDM.

Larynx osteosarcoma: case report

We present the case of a laryngeal osteosarcoma in a 69-year-old man, which generated many diagnostic and treatment difficulties. The patient was admitted to the hospital because of persisting hoarseness and a laryngeal tumor was seen on laryngoscopy. Total laryngectomy was performed and the pathological examination of the resected material showed osteosarcoma of the larynx. Postoperative radiotherapy was planned but the patient declined any treatment. He was readmitted to the hospital 5 months later with a neck tumor and enlarged lymph nodes on the right side of the neck. Chemotherapy started and during treatment metastatic lymph nodes on the left side of the neck and pulmonary metastases were detected.

Téléphone mobile, risque de tumeurs cérébrales et du nerf vestibuloacoustique: l'étude cas-témoins INTERPHONE en France

BACKGROUND

Use of cell phones has increased dramatically since 1992 when they were first introduced in France. Certain electromagnetic fields (at extremely low frequency) have been recognized as possibly carcinogenic by the International Agency for Research on Cancer. Given the use of radiofrequency technology in cell phones, the rapid increase in the number of cell phones has generated concerns about the existence of a potential health hazard. To evaluate the relationship between the use of cell phones and the development of tumors of the head, a multicentric international study (INTERPHONE), coordinated by the International Agency for Research on Cancer, was carried out in 13 countries. This publication reports the results of the French part of the INTERPHONE study.

METHODS

INTERPHONE is a case-control study focused on tumors of the brain and central nervous system: gliomas, meningiomas and neuromas of cranial nerves. Eligible cases were men and women, residents of Paris or Lyon, aged 30-59, newly diagnosed with a first primary tumor between February 2001 and August 2003. The diagnoses were all either histologically confirmed or based upon unequivocal radiological images. Controls were matched for gender, age (+/-5 years) and place of residence. They were randomly drawn from electoral rolls. Detailed information was collected for all subjects during a computer-assisted face-to-face interview. Conditional logistic regression was used to estimate the odds ratio (OR) for an association between the use of cell phones and risk of each type of cancer.

RESULTS

Regular cell phone use was not associated with an increased risk of neuroma (OR=0,92; 95% confidence interval=[0.53-1.59]), meningioma (OR=0,74; 95% confidence interval=[0.43-1.28]) or glioma (OR=1.15; 95% confidence interval=[0.65-2.05]). Although these results are not statistically significant, a general tendency was observed for an increased risk of glioma among the heaviest users: long-term users, heavy users, users with the largest numbers of telephones.

CONCLUSION

No significant increased risk for glioma, meningioma or neuroma was observed among cell phone users participating in Interphone. The statistical power of the study is limited, however. Our results, suggesting the possibility of an increased risk among the heaviest users, therefore need to be verified in the international INTERPHONE analyses.

The place of computed tomography as a guidance modality in percutaneous nephrostomy: analysis of a 10-year single-center experience

BACKGROUND

Percutaneous nephrostomy (PCN) has been established as an effective technique for urinary decompression or diversion. This procedure may be performed with the guidance of fluoroscopy, ultrasonography, a combination of fluoroscopy and ultrasonography, computed tomography (CT), or magnetic resonance imaging.

PURPOSE

To retrospectively review experience with CT-guided PCN over a 10-year period in a single center.

MATERIAL AND METHODS

All CT-guided PCN procedures performed in adults at our institution between 1995 and 2005 were evaluated. In 882 patients, 1113 nephrostomy catheters were inserted. Interventional radiologists or radiology residents under direct attending supervision inserted all catheters. During the PCN procedure, bleeding, sepsis, and injuries to adjacent organs were regarded as major complications. Clinical events requiring nominal therapy with no sequelae were regarded as minor complications.

RESULTS

PCN procedures were performed via 1-3 punctures in patients with grades 0-1 and 2 hydronephrosis, and via 1-2 punctures in patients with grade 3 hydronephrosis. They were carried out with a procedure time ranging from 9 to 26 min. All PCNs were considered as technically successful, and no major complications were observed. There were minor complications including transient macroscopic hematuria (28.6%, 19.9%, and 4.9% in patients with hydronephrosis grades 0-1, 2, and 3, respectively) and perirenal hematomas in a total of eight patients. No patient required additional intervention secondary to complications of the PCN procedure.

CONCLUSION

CT-guided PCN is an efficient and safe procedure with major and minor complication rates below the accepted thresholds. It can be used for the management of patients requiring nephrostomy insertion in inpatient settings, and might be a preferable procedure in patients with minimal or no dilatation of the renal pelvis.

The Association of Neurofibromatosis, Bilateral Pheochromocytoma and Primary Hyperparathyroidism

Neurofibromatosis (NF) is a hereditary disease and carries increased risk of both benign and malignant tumor development. Pheochromocytoma or hyperparathyroidism have been reported to be associated with NF type 1 (NF1). However, the coexistance of pheochromocytoma and parathyroid adenoma in a patient with NF1 is very rare. We report a case of a 37-year-old male with NF1, bilateral pheochromocytoma and parathyroid adenoma. This association sould be kept in mind in patients with NF1 in initial evaluation as well as during follow-up.

Determination of reference arterial blood pressure values by indirect methods for Kangal dogs

OBJECTIVES

To obtain reference arterial blood pressure values from Kangal dogs, a local giant breed found in Turkey.

METHODS

Arterial blood pressure measurements were obtained from 48 healthy Kangal dogs using oscillometric and Doppler techniques. The ages of the dogs ranged from two to 96 months, with a mean (sd) age of 36 (16) months.

RESULTS

The effect of age on systolic, diastolic and mean arterial pressures determined by the oscillometric technique and on systolic pressure determined by the Doppler technique was significant (P<0.001). Blood pressure was found to be higher in mature dogs compared with that in immature dogs. The effect of sex and the interaction between age and sex were not significant (P>0.05). There was a direct relationship between age and oscillometric systolic, diastolic and mean arterial pressures and Doppler systolic arterial blood pressure both in the whole group and the immature group (P<0.05). Correlation between age and systolic arterial blood pressure measured either by oscillometric or Doppler techniques was not significant in the mature group.

CLINICAL SIGNIFICANCE

The Kangal dog is bred in various countries including Turkey. It is known that giant breed dogs, such as the Kangal dog, are predisposed to cardiovascular disease. Canine arterial blood pressure values are highly breed and age dependent, so a reference value for any other breed is inappropriate for Kangal dogs. Therefore, it is important to measure arterial blood pressure of Kangal dogs.