Pressure-induced insulator-to-metal transition in TbBaCo_{2}O_{5.48}

TbBaCo_{2}O_{5.48} has been studied by high-pressure synchrotron x-ray diffraction together with resistivity measurements as a function of temperature and pressure. It was found that under pressure a structural phase transition takes place corroborating with a sluggish insulator-to-metal transition. An onset of the metallic state was deduced from a gradual drop of resistivity at the range 3-10 GPa culminating into the change in sign of dR/dT, from negative to positive, at P >or= 10 GPa; at the same pressure range there is a change of lattice strain components calculated from the unit cell dimensions. The changes in structural and transport properties are very similar to those found on heating at ambient pressure implying a common mechanism.

Distinct clinical characteristics of tuberous sclerosis complex patients with no mutation identified

Tuberous Sclerosis Complex (TSC) is a multi-system disorder that is highly variable in its clinical presentation. Current molecular diagnostic methods permit identification of mutations in either TSC1 or TSC2 in 75-85% of TSC patients. Here we examine the clinical characteristics of those TSC patients who have no mutation identified (NMI). A retrospective review of our patient population that had comprehensive testing for mutations in TSC1/TSC2 identified 23/157 (15%) that were NMI. NMI patients had a lower incidence of brain findings on imaging studies, neurological features, and renal findings than those with TSC2 mutations. In contrast, NMI patients had a lower incidence of seizures than TSC patients with TSC1 mutations, but had a higher incidence of both renal angiomyolipomas and pulmonary lymphangioleiomyomatosis. This distinct constellation of findings suggest that NMI patients may have a unique molecular pathogenesis, different from that seen in TSC patients with the usual mutations in TSC1 and TSC2. We suggest that the mechanisms of disease in these patients include both mosaicism for a TSC2 mutation, and unusual non-coding region mutations in TSC2.

Diabetes-related parameters and periodontal conditions in children

BACKGROUND AND OBJECTIVE

The relationship between diabetes and periodontal diseases is well established. Our aim in this study was to explore the diabetes-related parameters that are associated with accelerated periodontal destruction in diabetic youth.

MATERIAL AND METHODS

Three-hundred and fifty 6-18-year-old children with diabetes received a periodontal examination. Data on important diabetes-related variables were collected. Analyses were performed using logistic regression, with gingival/periodontal disease as the dependent variable, for the whole cohort and separately for two subgroups (6-11 and 12-18 years of age).

RESULTS

Regression analyses, adjusting for age, gender, ethnicity, frequency of prior dental visits, dental plaque, and dental examiner, revealed a strong positive association between mean hemoglobin A1c over the 2 years prior to inclusion in the study and periodontitis (odds ratio = 1.31, p = 0.030). This association approached significance in the younger subgroup (odds ratio = 1.56, p = 0.052, n = 183). There was no significant relationship between diabetes duration or body mass index-for-age and measures of gingival/periodontal disease in this cohort.

CONCLUSION

These findings suggest that accelerated periodontal destruction in young people with diabetes is related to the level of metabolic control. Good metabolic control may be important in addressing periodontal complications in young patients with diabetes, similarly to what is well established for other systemic complications of this disease.

Endoscopic repair of choanal atresia: practical operative technique

Choanal atresia is a well-known entity with various surgical approaches. The introduction of nasal endoscopic surgery made the endoscopic approach the most popular one because of excellent visualization and a good view of the choana to remove enough vomerian septal bone. Seven patients with choanal atresia were treated with 9 endoscopic procedures. Some practical operative details are described that can minimize the chance for restenosis.

Differences in psychological and physical health among layoff survivors: the effect of layoff contact

This study examined health and well-being among workers who have experienced varying types of contact with layoffs in an organization undergoing downsizing. Using survey data from a large organization employing both white- and blue-collar workers (N = 2,279), the authors argued that there are important differences among surviving workers as a function of their layoff experiences. Having any kind of personal contact with layoffs is found to be associated with less job security, more symptoms of poor health, depression, and eating changes as compared with having no layoff contact. Being laid off and rehired is associated with more work-related injuries and illnesses and missed work days due to such events than is receiving a "warn" notice, indirect contact (i.e., friends or coworkers laid off), or no contact with layoffs. Job security partially mediates the relationship between type of layoff contact experiences and health.

The relationships between alcohol problems and well-being, work attitudes, and performance: are they monotonic?

PURPOSE

Investigators who have examined the relationship between work characteristics and off-the-job alcohol consumption or problems have typically assumed a linear or monotonic relationship (e.g., as work pressures increase, so do alcohol consumption and problems). In the present study, we examine this monotonicity assumption by investigating the nature of the relationships between alcohol problems and multiple demographic, work attitude, well-being, and work performance variables.

METHOD

Survey data and data from company records were collected from a large sample of blue- and white-collar employees (N = 2,279). Participation was voluntary, confidential, and compensated with a $20 payment.

RESULTS

Evidence for several different types of statistical relationships between alcohol problems and other variables were found through both analyses of variance (ANOVA) and covariance (ANCOVA). There were several variables that were linearly related to alcohol problems. There was also some support for a "threshold" effect where only the most problematic drinkers (2.6% of sample) showed declines on job attitude and general well-being indices. In some cases, those who drank but report no alcohol problems showed significantly more positive job and life attitudes than either those who abstained or those who had relatively more alcohol problems.

IMPLICATIONS

We conclude that strict linearly based relationships might not necessarily explain the work-to-drink relationship most effectively.

Differences in psychological and physical health among layoff survivors: the effect of layoff contact

This study examined health and well-being among workers who have experienced varying types of contact with layoffs in an organization undergoing downsizing. Using survey data from a large organization employing both white- and blue-collar workers (N = 2,279), the authors argued that there are important differences among surviving workers as a function of their layoff experiences. Having any kind of personal contact with layoffs is found to be associated with less job security, more symptoms of poor health, depression, and eating changes as compared with having no layoff contact. Being laid off and rehired is associated with more work-related injuries and illnesses and missed work days due to such events than is receiving a "warn" notice, indirect contact (i.e., friends or coworkers laid off), or no contact with layoffs. Job security partially mediates the relationship between type of layoff contact experiences and health.

The prognostic value of the tumour marker Cyfra 21-1 in carcinoma of head and neck and its role in early detection of recurrent disease

This study examines a new tumour marker, Cyfra 21-1, as a prognostic marker in predicting the survival of H&N cancer patients, and its correlation with clinical outcome during prolonged follow up of these patients. The study included 67 patients with primary detection of carcinoma of H&N. The survival of these patients was evaluated in correlation with the disease stage and Cyfra 21-1 levels at initial diagnosis. 38 patients were followed clinically and with serial assays for at least 12 months, or until recurrence was diagnosed. Cyfra 21-1 levels were determined periodically, using an Elisa kit. Patients with Cyfra 21-1 < 1.5 ng ml(-1)had a higher survival rate compared to patients with Cyfra 21-1 > or = 1.5 ng ml(-1)(63% vs. 20%, respectively). The risk ratio of Ln(Cyfra 21-1) is 1.62 (P = 0.028). In a Cox regression model that included the disease stage and Ln(Cyfra 21-1), Ln(Cyfra 21-1) was preferred as the main parameter for predicting patients survival. In 83% of the 12 patients with recurrent or residual disease, Cyfra 21-1 was elevated before or during clinical detection of the recurrence. Cyfra 21-1 was found to be a prognostic marker for carcinoma of H&N, unrelated to the stage of the disease. Elevated levels of Cyfra 21-1 without clinical evidence of disease can be attributed to the marker's mean lead-time as compared to the clinical appearance of the disease.

The New York State universal newborn hearing screening demonstration project: outpatient outcome measures

OBJECTIVE

To investigate outpatient outcome measures of a multi-center, state-wide, universal newborn hearing screening project.

DESIGN

Eight hospitals participated in a 3-yr, funded project. Each hospital designed its own protocol using common criteria for judging whether an infant passed a hearing screening. Infants were tested in the hospital, and those either failing the in-hospital screening or who were not tested in the hospital (missed) were asked to return 4 to 6 wk after hospital discharge for outpatient rescreening. Those infants failing the outpatient rescreening were referred for diagnostic auditory brain stem response testing. Each hospital used its own audiological equipment and criteria to determine whether a particular infant had a hearing loss. All data were collected and analyzed for individual hospitals, as well as totaled across all hospitals. Data were analyzed in terms of year of program operation, nursery type, and geographic region.

RESULTS

Seventy-two percent of infants who failed the in-hospital screening returned for outpatient testing. The percentage of in-hospital fails returning for retesting was significantly higher than the percentage of in-hospital misses returning for retesting. The percentage of infants returning for retesting increased with successive years of program operation. Some differences were noted in the percentage of infants returning for retesting among hospitals and geographic regions of the state. Some differences in outpatient outcome measures also were noted between infants originally born into the neonatal intensive care unit (NICU) and the well-baby nursery (WBN). The percentage of infants from the NICU who returned for retesting was slightly higher than that for infants from the WBN. The percentage of infants from the WBN passing the outpatient rescreening was higher than that for the NICU infants. The overall prevalence of hearing loss was 1.96/1000, with that in the NICU being 8/1000 and that in the WBN being 0.9/1000. Positive predictive value for permanent hearing loss based on inpatient screening was approximately 4% and based on outpatient rescreening was approximately 22%.

CONCLUSIONS

Several outpatient outcome measures changed with successive years of program operation, suggesting that programs improve over time. Also, some outpatient outcome measures differ between NICU and WBN populations. The differences noted across regions of the state in the percentage of infants returning for outpatient retesting require further research to determine whether differences are due to demographic and/or procedural differences.

New York State universal newborn hearing screening demonstration project: effects of screening protocol on inpatient outcome measures

OBJECTIVE

To examine differences among various test protocols on the fail rate at hospital discharge for infants in the well-baby nursery (WBN) and neonatal intensive care unit (NICU) who received hearing screening through a universal newborn hearing screening demonstration project.

DESIGN

The outcomes of several screening protocols were examined. Two technologies were used: transient evoked otoacoustic emissions (TEOAEs) alone or in combination with the auditory brain stem response (ABR). The performance of test protocols in both nurseries within eight hospitals was examined over a 2- to 3-yr period. In the WBN, six hospitals used a screening protocol of TEOAE technology first followed by an ABR (automated or conventional) technology screening for newborns who referred on TEOAE screening. Two hospitals used TEOAE only in the WBN. Seven hospitals used screening protocols in the NICU that used a combination of TEOAE and ABR technologies (TEOAE technology administered first or second, before or after TEOAE, or TEOAE and ABR tests on all infants). Only one hospital used TEOAE technology exclusively for hearing screening.

RESULTS

Significant differences among screening protocols were found across hospitals in the first, second, and third years of the program. The combination of TEOAE technology and ABR technology (a two-technology screening protocol) resulted in a significantly lower fail rate at hospital discharge than the use of a single-technology (TEOAE). Fail rates at discharge were twice as high using the one-technology protocol versus two-technology protocol, even when the best outcomes from program year 3 were considered exclusively. Results of two-technology versus one-technology protocols were similar in the NICU. Use of a second technology for screening TEOAE fails significantly reduced every hospital that used the protocol's fail rate at discharge.

CONCLUSIONS

A two-technology screening protocol resulted in significantly lower fail rates at hospital discharge in both the WBN and NICU nurseries than use of a single-technology (TEOAE) hearing screening protocol.

The New York State universal newborn hearing screening demonstration project: ages of hearing loss identification, hearing aid fitting, and enrollment in early intervention

OBJECTIVE

To determine the ages of hearing loss identification, hearing aid fitting, and enrollment in early intervention through a multi-center, state-wide universal newborn hearing screening project.

DESIGN

Universal newborn hearing screening was conducted at eight hospitals across New York State. All infants who did not bilaterally pass hearing screening before discharge were recalled for outpatient retesting. Inpatient screening and outpatient rescreening were done with transient evoked otoacoustic emissions and/or auditory brain stem response testing. Diagnostic testing was performed with age appropriate tests, auditory brain stem response and/or visual reinforcement audiometry. Infants diagnosed with permanent hearing loss were considered for hearing aids and early intervention. Ages of hearing loss identification, hearing aid fitting, and enrollment in early intervention were investigated regarding nursery type, risk status, unilateral versus bilateral hearing loss, loss type, loss severity, and state regions.

RESULTS

The prevalence of infants diagnosed with permanent hearing loss was 2.0/1000 (85 of 43,311). Of the 85 infants with hearing loss, 61% were from neonatal intensive care units (NICUs) and 67% were at risk for hearing loss. Of the 36 infants fitted with hearing aids, 58% were from NICUs and 78% were at risk for hearing loss. The median age at identification and enrollment in early intervention was 3 mo. Median age at hearing aid fitting was 7.5 mo. Median ages at identification were less for infants from the well-baby nurseries (WBNs) than for the NICU infants and for infants with severe/profound than for infants with mild/moderate hearing loss, but were similar for not-at-risk and at-risk infants. Median ages at hearing aid fitting were less for well babies than for NICU infants, for not-at-risk infants than for at-risk infants, and for infants with severe/ profound hearing loss than for infants with mild/ moderate hearing loss. However, median ages at early intervention enrollment were similar for nursery types, risk status, and severity of hearing loss.

CONCLUSIONS

Early ages of hearing loss identification, hearing aid fitting, and enrollment in early intervention can be achieved for infants from NICUs and WBNs and for infants at risk and not at risk for hearing loss in a large multi-center universal newborn hearing screening program.

New York State universal newborn hearing screening demonstration project: inpatient outcome measures

OBJECTIVE

To evaluate the feasibility of universal newborn hearing screening by examining inpatient outcome measures from 8 hospitals located in geographically diverse areas of New York State over a 3-yr period.

DESIGN

Funding was provided by the New York State Department of Health to implement predischarge hearing screening programs in the neonatal intensive care units (NICUs) and well-baby nurseries (WBNs) of eight hospitals. Various screening protocols including transient evoked otoacoustic emissions alone or in combination with conventional auditory brain stem response or screening auditory brain stem response were implemented by each site. Measured outcomes included rate of misses, refusals, and fails. Results were analyzed as a function of year of operation, nursery type, and geographic location.

RESULTS

Six out of eight hospitals successfully implemented universal hearing screening during the first year, and the remaining 2 hospitals implemented programs during the second year of the project. Over a period of 3 yr, 69,761 newborns were screened at the eight hospitals representing 96.9% of all live births. The overall fail rate (4.04%) combined with the miss rate (2.61%) resulted in 6.63% of infants referred for outpatient follow-up. Mean data indicated that inpatient outcome measures improved with year of operation, with most individual hospitals also showing improvements. Both fail and miss rates were higher in the NICU than in the WBN and for hospitals located in New York City than in other regions of the state.

CONCLUSIONS

Inpatient outcome measures of a universal newborn hearing screening project, which involved multiple centers across geographically diverse regions of New York State, were acceptable in terms of successfully screening a high percentage of live births and attaining low refer rates for outpatient screening. This study adds to the growing body of literature supporting the feasibility of screening all newborns before hospital discharge.

Acute mastoiditis in children: is surgical treatment necessary?

Acute mastoiditis in children remains an otological problem. Although the widespread use of antibiotics has reduced the need for surgical intervention, surgery is frequently used in the treatment of acute mastoiditis and its complications. The charts of 44 patients hospitalized with signs of acute mastoiditis were reviewed. In 43.2 per cent of all patients, acute mastoiditis was the presenting sign of acute middle-ear infection. Post-auricular erythema and protrusion of the auricle were the most frequent signs at presentation. All four signs (post-auricular erythema, oedema, tenderness, and protrusion of the auricle) were present in 40.9 per cent of patients. No bacterial pathogen was isolated in 45.5 per cent of ear cultures. Complicated acute mastoiditis was diagnosed in 13.7 per cent of the patients. Eighty-seven per cent of patients responded well to intravenous antibiotics and myringotomy, and in 11.4 per cent mastoidectomy or abscess drainage were performed. We conclude that nearly all patients with uncomplicated mastoiditis recover following intravenous antibiotics and myringotomy. Mastoidectomy should be performed in selected cases, such as cases of complicated acute mastoiditis.

Work stress and self-reported alcohol use: the moderating role of escapist reasons for drinking

This study examines the moderating role of escapist reasons for drinking alcohol in the job stress/self-reported alcohol use and problems relationship. It was hypothesized that higher levels of job stress would be associated with higher levels of self-reported drinking (H1) and drinking problems (H2) only for those who endorsed escapist reasons for drinking. For those who did not hold such beliefs, higher levels of job stress were predicted to be associated with lower self-reported alcohol intake (H3) and problems (H4). Survey data from white- and blue-collar workers employed across all paycodes and positions were collected randomly at a large manufacturing organization (62% response rate). Participants responded to questions concerning work stress, reasons for drinking, alcohol intake, and alcohol problems. Using only nonabstainers with complete data (N = 1,645), results from regression analyses generally supported all hypotheses.

Work stress and self-reported alcohol use: the moderating role of escapist reasons for drinking

This study examines the moderating role of escapist reasons for drinking alcohol in the job stress/self-reported alcohol use and problems relationship. It was hypothesized that higher levels of job stress would be associated with higher levels of self-reported drinking (H1) and drinking problems (H2) only for those who endorsed escapist reasons for drinking. For those who did not hold such beliefs, higher levels of job stress were predicted to be associated with lower self-reported alcohol intake (H3) and problems (H4). Survey data from white- and blue-collar workers employed across all paycodes and positions were collected randomly at a large manufacturing organization (62% response rate). Participants responded to questions concerning work stress, reasons for drinking, alcohol intake, and alcohol problems. Using only nonabstainers with complete data (N = 1,645), results from regression analyses generally supported all hypotheses.

Multicenter trial validation of a camera-based method to measure Tc-99m mercaptoacetyltriglycine, or Tc-99m MAG3, clearance

PURPOSE

To evaluate an improved camera-based method for calculating the clearance of technetium-99m mercaptoacetyltriglycine (MAG3) in a multicenter trial.

MATERIALS AND METHODS

Tc-99m MAG3 scintigraphy was performed in 49 patients at three sites in the United States and Canada. The percentage of the injected dose of Tc-99m MAG3 in the kidney at 1-2, 1.0-2.5, and 2-3 minutes after injection was correlated with the plasma-based Tc-99m MAG3 clearances. The data were combined with the results obtained in 20 additional patients in a previously published pilot study.

RESULTS

Regression models correlating the plasma-based Tc-99m MAG3 clearance with the percentage uptake in the kidney for each time interval were developed; there was no statistically significant difference among sites in the regression equations. Correction for body surface area statistically significantly (P < .005) improved the correlation coefficient for each time interval. For the 1.0-2.5-minute interval, the body surface area-corrected correlation coefficient for the four combined sites was .87, and it improved to .93 when one outlier was omitted from the analysis. Similar results were obtained with the other time intervals. Independent processing by two observers showed no clinically important differences in the percentage dose in the kidney or in relative function.

CONCLUSION

An improved camera-based method to calculate the clearance of Tc-99m MAG3 was validated in a multicenter trial.

Newly delivered transferrin iron and oxidative cell injury

Cell iron status was assessed in terms of its capacity to mediate cell injury by pro-oxidants. Cultured K562 cells, which maintain a stable cytosolic labile iron pool (LIP) of < 0.5 microM, underwent distinct changes after short exposures to transferrin (Tf) followed by t-butyl hydroperoxide (TBHP): (a) rise in LIP, detectable fluorimetrically; (b) increased lipid peroxidation and (c) eventual cell death. All of these effects were inhibited by weak bases or iron chelators. Similarly, hydrogen peroxide caused rises in both LIP and oxidant species detectable with 2',7'-dichlorofluorescin diacetate, which were enhanced by preincubation with Tf. The Tf-delivered iron disappeared from LIP and the TBHP-reactive pool with a t1/2 < 30 min. The results indicate that the catalytic potential of iron is highest while in transit between endosomes and cytosolic ligands.

Cyclosporine-induced worsening of hepatic dysfunction in a patient with Crohn's disease and enterocutaneous fistula

Cyclosporine recently has become part of the treatment regimen for patients with refractory inflammatory bowel disease, though it is still considered investigational for that purpose. However, little attention has been given to the potential hepatotoxicity associated with cyclosporine administration. This can be especially significant in patients with preexisting abnormalities of liver function, including those induced by total parenteral nutrition.