Functional loss in early age-related maculopathy: the ischaemia postreceptoral hypothesis

We review proposed models and psychophysical and electrophysiological tests performed in many studies for early age-related maculopathy (ARM). We suggest that ischaemia is the trigger for impaired retinal pigment epithelium function causing imbalance of secretion of vascular growth factors, reduced disc degradation capability and reduced metabolic activity and possible inflammatory response. This results in increased deposition of cell debris, such as drusen and thickens Bruch's membrane causing even more ischaemia of the overlying neurosensory retina. The photoreceptors are more resistant to ischaemia given their proximity to the choroid. Furthermore, being 'upstream' from the inner retinal layers, they act as an oxygen sink depriving retinal layers further from the choroid. Postreceptoral cell layers and especially parts of the inner nuclear layer that are located in the watershed zone between two sources of blood supply are preferentially vulnerable to ischaemia. Based on psychophysical and electrophysiological findings we propose that most of the function impairment in early ARM starts postreceptorally.

Disruption of the tear film by the application of small drops of saline and surfactant

The effects of disrupting the tear film by placing 5 or 10 microl drops of saline and mild surfactant solution (SS) directly onto the tear films of 10 subjects were observed and are described here. Disruption of the tear film was only transient, with restoration of the film occurring within about two to three blinks for saline drops, and four to six blinks for SS drops. When a drop of SS was placed on a cornea, two types of black spots/areas may be observed: black areas apparently similar to those observed in the TBUT test, and black areas forming outside the border of the pattern of the spreading SS drop. In general, staining of the black areas formed in the fluorescein-stained tears did not occur even when blinking was inhibited for up to 13 s. Stained areas on the corneal surface did not have a tendency to form black spots first; the tear film over these areas did not appear to be less stable than on other areas of the corneal surface.

Romantic relationships for women with anorexia nervosa: an integrative literature review

OBJECTIVE

To critically appraise literature concerning romantic relationships for women with anorexia nervosa (AN), and to gain perspective on future research directives.

METHOD

Key electronic databases, reference lists, and journals were searched. The search was limited to features of romantic relationships and their quality. Nineteen studies were critiqued and abstracted.

RESULTS

All 19 studies used a quantitative design; no qualitative studies were retrieved. Methodological strengths of these studies included confounder control and appropriate statistical analyses for design. Weaknesses included a failure to declare study designs, address sources of bias, and justify study samples, as well as a lack of con-founder control.

DISCUSSION

The review drew attention to the varied relational experiences and marked relationship dissatisfaction expressed by women with AN. However, an understanding of relationship quality and its dynamic nature remains limited. Future research should focus on how meanings are negotiated in relationships, providing detailed descriptions of the women's experiences, which is best done with qualitative study. Well-conducted longitudinal research should address questions that cannot be answered by current research designs, such as temporality.

Oesophageal foreign bodies at the University Hospital of the West Indies

A retrospective study was conducted of 97 patients with oesophageal foreign bodies (EFB). The patients were admitted to assess characteristics of EFB, modes of presentation and radiological and endoscopic findings. The patients were from the University Hospital of the West Indies and most (42%) were over the fourth decade of life. The commonest EFB were bones. A negative radiological finding was not a reliable means to select patients for endoscopy. Oesophagoscopy is a reliable method in the treatment of EFB impaction. There were no major complications or deaths.

Evaluation of the VIDAS Listeria (LIS) immunoassay for the detection of Listeria in foods using demi-Fraser and Fraser enrichment broths, as modification of AOAC Official Method 999.06 (AOAC Official Method 2004.06)

A multilaboratory study was conducted to compare the VIDAS LIS immunoassay with the standard cultural methods for the detection of Listeria in foods using an enrichment modification of AOAC Official Method 999.06. The modified enrichment protocol was implemented to harmonize the VIDAS LIS assay with the VIDAS LMO2 assay. Five food types--brie cheese, vanilla ice cream, frozen green beans, frozen raw tilapia fish, and cooked roast beef--at 3 inoculation levels, were analyzed by each method. A total of 15 laboratories representing government and industry participated. In this study, 1206 test portions were tested, of which 1170 were used in the statistical analysis. There were 433 positive by the VIDAS LIS assay and 396 positive by the standard culture methods. A Chi-square analysis of each of the 5 food types, at the 3 inoculation levels tested, was performed. The resulting average Chi square analysis, 0.42, indicated that, overall, there are no statistical differences between the VIDAS LIS assay and the standard methods at the 5% level of significance.

"Minimal intervention management" for gastroschisis: a preliminary report

The replacement of eviscerated bowel, without anaesthesia, has been performed safely in stable neonates with gastroschisis. This technique, termed "minimal intervention management", was used in three infants treated at the Newborn Special Care Nursery of the University Hospital of the West Indies. Two infants had excellent results but one had bowel perforation during the procedure, necessitating conversion to formal laparotomy under general anaesthesia. In selected patients, advantages of this technique include the ability to be guided by patient response during the procedure in order to avoid excessive intra-abdominal tension, the avoidance of anaesthesia and minimal cost. This technique is proposed for wider use in developing countries.

Long lived multi-isotype anti-HIV antibody responses following a prime-double boost immunization strategy

Despite decades of work, an effective HIV vaccine remains elusive. In an effort to elicit protective immunity, investigators have sought to define vaccines able to elicit durable HIV-specific B-cell and T-cell activities. Additionally, vaccines are sought which can induce antibodies of a variety of isotypes, as each isotype possesses unique attributes in terms of opsonization, Fc receptor binding capacity, complement fixation and location. One prominent new vaccine strategy, applied to numerous distinct antigenic systems is the prime boost-regimen, with DNA, vaccinia virus (VV), and/or purified recombinant protein. To examine the durability, location and isotype distribution of responses induced by prime-boost regimens, we tested successive immunizations with DNA, VV and protein (D-V-P), comparing three forms of protein inoculations: (i) purified protein administered intramuscularly with complete Freunds adjuvant, (ii) purified protein administered intranasally, and (iii) purified protein conjugated to oxidized mannan, administered intranasally. We found that all three protocols elicited serum antibodies of multiple isotypes, with serum IgA being most prominent among mice immunized with mannan-conjugated protein. All D-V-P protocols, regardless of protein form or route, also elicited antibody responses at mucosal surfaces. In bronchoalveolar lavage, a tendency toward IgA production was again most prominent in mice boosted with the protein-mannan conjugate. Both B-cell and T-cell responses were sustained for more than 1 year post-immunization following each form of vaccination. Contemporaneous with long-lasting serum and mucosal antibodies were antibody forming cells in the bone marrow of primed animals. Results highlight the D-V-P vaccination strategy as a promising approach for attaining durable, multi-isotype B-cell and T-cell activities toward HIV.

Measurements of preferred walking speed in subjects with central and peripheral vision loss

BACKGROUND

Previous mobility studies have used Preferred Walking Speed (PWS) in order to determine the walking efficiency in terms of the Percent Preferred Walking Speed (PPWS) of visually impaired adults. PWS has been measured in previous studies using the sighted guide (SG) and non-sighted guide (NSG) techniques. This study compared the NSG, SG and string (ST) (subjects walked by holding on lightly to a cardboard tube attached to a piece of string) techniques of measuring PWS in visually impaired subjects.

METHODS

Forty visually impaired subjects with central and peripheral vision loss were recruited. PWS was measured using the NSG, SG and ST techniques. For each technique, PWS was determined by recording the time taken for a subject to walk an unobstructed, straight 20-m corridor.

RESULTS

There were no significant differences in PWS using the SG, NSG and ST techniques.

CONCLUSION

For assessing walking efficiency, either the SG, NSG or ST technique could be employed when measuring PWS in visually impaired subjects.

Aging and mfERG topography

AIM

To study the effect of aging retina on the multifocal electroretinogram (mfERG).

METHODS

A total of 18 young subjects (age 18-24 years) and 36 elderly subjects (aged 60-85 years) with intraocular lenses (IOLs) were recruited for this study. No subjects had significant eye diseases or media opacities. mfERG was measured in standard conditions using the VERIS system (version 4.1). There were three groups of 18 subjects: (1) 18-25 years, (2) 60-70 years, and (3) 75-85 years. mfERG responses were grouped into central, paracentral, and peripheral regions for analysis. The N1 amplitude, P1 amplitude, N1 latency, and P1 latency of the first-order responses were analysed.

RESULTS

Age had no effect on P1 latency, N1 amplitude, and P1 amplitude; however, N1 latencies from central to peripheral regions were significantly longer for group 3 than for group 1.

CONCLUSIONS

This study suggests that measured age-related decreases in mfERG responses are due to optical factors (decrease in retinal light levels, scatter) before the age of 70 years, but neural factors significantly affect mfERG topography after the age of 70 years.

Monitoring retinal function in early age-related maculopathy: visual performance after 1 year

PURPOSE

To monitor visual performance in early age-related maculopathy (ARM).

METHODS

We measured monocular visual function-high-contrast visual acuity (HC-VA), central visual fields (mean sensitivity, MS), colour vision (desaturated Panel D-15), Pelli-Robson (P-R), and cone- and rod-mediated multifocal electroretinograms (mfERG) in 13 ARM subjects and 13 age-matched control subjects with normal fundi at baseline and after 1 year. All had visual acuity of 6/12 or better. The mfERG data were compared to templates derived from the control group at baseline. We analysed the mfERG results by averaging the central and peripheral fields and the superior and inferior fields (CP and SI methods) and by calculating the local responses.

RESULTS

The mean rod-mediated responses were significantly delayed in the ARM group for the CP (P=0.04) and the SI methods (P=0.03) at baseline compared to the control group. This did not change significantly after 1 year, whereas the mean cone-mediated responses were within the normal range at both times. Although the local analysis revealed lower amplitudes for the cone- and rod-mediated responses at baseline this was not found after 1 year and only the local rod-mediated latencies were delayed at both times (P<0.01). HC-VA, desaturated Panel D-15 and P-R were significantly worse in the ARM group (P< or =0.01) at baseline but did not show further significant deterioration. Progressive fundus changes were found in only two subjects (18%).

CONCLUSION

Although there was significant impairment of retinal function in early ARM at baseline no further deterioration was evident after 1 year.

Cone- and rod-mediated multifocal electroretinogram in early age-related maculopathy

PURPOSE

To investigate the cone- and rod-mediated multifocal electroretinograms (mfERG) in early age-related maculopathy (early ARM).

METHODS AND SUBJECTS

We investigated the cone- and rod-mediated mfERG in 17 eyes of 17 subjects with early ARM and 16 eyes of 16 age-matched control subjects with normal fundi. All subjects had a visual acuity of 6/12 or better. We divided the ARM subjects into two groups based on drusen size and retinal pigment epithelium abnormalities-a less advanced (ARM1) and a more advanced (ARM2) group. The mfERG data were compared to templates derived from the control group. We analysed the mfERG results for the central and peripheral fields (CP method) and the superior and inferior fields (SI method).

RESULTS

While the mean cone results showed no statistically significant difference between the groups, the rods showed significantly delayed responses in the ARM1 group for the CP and the SI methods, but not in the ARM2 group, although there was a trend of longer latencies compared to the control group.

CONCLUSION

Our results show a functional impairment of the rods in early ARM subjects. As there is histopathological evidence showing earlier rod than cone impairment in early ARM, following the rod function with the mfERG might be helpful in diagnosis or for monitoring the progression of early ARM.

Effects of different degrees of cataract on the multifocal electroretinogram

AIM

To study the effect of different degrees of nuclear cataract on the multifocal electroretinogram (mfERG).

METHODS

mfERGs were recorded from 30 elderly subjects with very mild, mild, or moderate nuclear cataracts using a VERIS System (version 4.1). The subjects were divided into three groups (10 in each group) according to their degree of nuclear cataracts as classified according to the Lens Opacities Classification System III (LOCS III). No subjects had any significant eye disease or degenerative changes except for cataracts. The mfERG responses were grouped into six concentric rings for analysis. Both the N1 and P1 amplitudes and the latencies of N1 and P1 of first-order responses were used for analysis.

RESULTS

Amplitudes of N1 and P1 from the central retina (14 degrees) were significantly reduced in patients with mild or moderate cataract when compared with subjects with very mild cataract. However, there was no significant reduction of N1 and P1 amplitudes in the para-central retina (14-40 degrees). There was no difference in the latencies of N1 and P1 in these three groups of subjects.

CONCLUSIONS

The mfERG responses from the central retina (central 14 degrees) were affected by the severity of cataract, but responses from the paracentral retina (14-40 degrees) were not affected. This suggests that in interpreting the mfERG in subjects with mild or moderate cataract subjects some care should be taken as reduced amplitudes (N1 and P1) will be expected from the central retina.

Newborn circumcision using the Plastibell device: an audit of practice

Circumcision of newborn male infants is widely practiced but controversial. Our experience gained circumcising 205 Jamaican neonates, using the Plastibell device is presented. Circumcisions, were requested by parents usually for hygienic reasons, and were brief outpatient procedures. Subcutaneous penile ring block with 1% lidocaine provided the most effective form of procedural analgesia. Bell separation usually occurred within 10 days of the procedure. Cosmetic results met with unanimous parental acceptance. Minor complications occurred in 2.4% of circumcisions. Physicians circumcising newborns must be readily accessible post procedure to address parental concerns and allay anxiety.

Electrical impedance tomography spectroscopy (EITS) for human head imaging

Electrical impedance tomography (EIT) is a recently developed medical imaging method which has practical advantages for imaging brain function as it is inexpensive, rapid and portable. Its principal use in validated human studies to date has been to image changes in impedance at a single excitation frequency over time, but there are potential applications where it is desirable to obtain images from a single point in time, which could be achieved by imaging over multiple frequencies. We describe a novel multifrequency EIT design which provides up to 64 electrodes for imaging in the head. This was achieved by adding a multiplexer to a single channel of an existing system, the Sheffield Mark 3.5. This provides a flexible protocol for addressing up to 64 electrodes but CMRR decreases from 90 dB to 80 dB and analogue amplifier bandwidth from > 1.6 MHz to 0.8 MHz. This did not significantly affect performance, as cylinders of banana, 10% of the diameter of a saline filled spherical tank, could be visualized with frequency referenced imaging. The design appears to have been an acceptable compromise between practicality and performance and will now be employed in clinical trials of multifrequency EIT in stroke, epilepsy and neonatal brain injury.

The effect of light scattering on multifocal electroretinography

PURPOSE

Unclear ocular media is a very common condition of older eyes characterized by significant light scattering and image degradation. The multifocal electroretinography (MERG) is a useful objective technique to measure retinal activity but its validity in the presence of cloudy ocular media remains unclear. We tested the MERG under controlled light scattering conditions using a liquid crystal diffuser (LCD) that simulated different degrees of image degradation.

METHODS

The MERG were taken from 13 normal young subjects seated behind a LCD set under two conditions: scatter (visual acuity approximately 6/18) and non-scatter (visual acuity approximately6/6). The pupils had been dilated and the eyes were optically corrected for the working distance. The first-order kernel MERG response was analysed. Three subjects underwent MERG measurement with two additional intermediate light scattering levels (i.e. visual acuity approximately 6/9 and 6/12).

RESULTS

The macular MERG response density was reduced (p < 0.001), but the peripheral MERG response densities were increased (p < 0.001) under the scattering condition. A similar trend was also observed with intermediate degrees of light scattering. Comparing the MERG waveforms without light scattering, a new retinal response was identified with a characteristic latency of about 60 ms (P60), but it was diminished in size under the scattering conditions.

CONCLUSIONS

The veiling luminance might have caused the reduction in the macular MERG response and an elevation in the peripheral retina with light scatter. The functional suppression of P60 observed under the influence of light scatter may be related to retinal adaptation. Unclear optical media will affect the interpretation of MERG results.

Variables in the spread of tumor cells to trocars and port sites during operative laparoscopy

BACKGROUND

Port-site recurrences have delayed the uptake of laparoscopic colectomy, but the etiology of these is incompletely understood. These studies were designed to investigate variables such as the size of the tumor inoculum and the volume and pressure of the insufflated gas during operative laparoscopy that might affect the deposition of these cells in relation to trocars and port sites.

METHODS

Radiolabeled human colon cancer cells were injected into the peritoneal cavity of pigs. Three trocars were inserted, and the abdomen was insufflated with carbon dioxide. The movement of cells within the abdomen was traced on a gamma camera. After 2 h, the trocars were removed and the port sites excised. Two studies were performed. In the first study, tumor inocula were varied from 1.5 x 10(5) to 120 x 10(5). In the second study, insufflation pressure was varied, with pressures 0, 4, 8 and 12 mmHg were studied.

RESULTS

When larger tumor inocula were injected, the contamination of both trocars (p = 0.005, Kendall's rank correlation) and trocar sites (p = 0.04, Kendall's rank correlation) increased. The deposition of cells on a trocar site was linked to contamination of its trocar (p = 0.03, chi-square), but the contamination of trocars did not always result in trocar-site contamination (p = 0.5, chi-square). Increased volumes of gas insufflation caused increased intraabdominal movement of tumour cells (p = 0.01, Kendall's rank correlation), although this did not lead to greater contamination of trocars or port sites (p = 0.82, Kendall's rank correlation). Decreased insufflation pressures resulted in increased contamination of trocars and port sites (p = 0.01, Kendall's rank correlation).

CONCLUSIONS

If clinical situations parallel this study, strategies such as increasing insufflation pressure, reducing episodes of desufflation and gas leaks, and using frequent intraabdominal lavage may help to reduce the numbers of viable tumor cells displaced to port sites during laparoscopic surgery for intraabdominal malignancy. This may reduce the rate of port-site metastases.

A profile of an HIV-and child-specific programme in New Orleans, Louisiana, USA

Since the beginning of the AIDS epidemic, 4.3 million children under 15 years of age have been infected with HIV worldwide; in the year 2000 alone, the World Health Organization estimates that 600,000 children became HIV-infected. Ancillary services offer the potential to improve access to and retention in primary care through removal of barriers to care. Globally, ancillary services may actually represent a significant proportion of all care delivered to HIV-infected children, particularly in the absence of expensive antiretroviral treatments. The purpose of this non-concurrent cohort study was to describe a population of HIV-infected children receiving ancillary services from an HIV- and family-specific ancillary service programme in New Orleans, Louisiana, USA. Forty-two HIV-infected children ages newborn to 13 years were included in the study. The majority were between one and five years of age (50.0%), male (54.8%), African-American (88.1%), and perinatally infected (97.6%). Services were well utilized; delivery decreased with age and increased with severity of clinical disease. Improved retention, prescription of antiretroviral treatment and HIV-related emergency room utilization were associated with ancillary service receipt. Ancillary services delivered by an HIV- and family-specific programme assist HIV-infected children to receive improved medical care. Ancillary services are a valuable adjunct to primary care, particularly in the complex care of the HIV-infected children from historically underserved populations.

Effect of using prismatic eye lenses on the posture of patients with adolescent idiopathic scoliosis measured by 3-d motion analysis

This is a preliminary investigation to detect the body sway and postural changes of patients with AIS under different spatial images. Two pairs of low-power prismatic eye lenses (Fresnel prisms) with 5 dioptre and 10 dioptre were used. In the experiment, the apices of the prisms were orientated randomly at every 22.5 degrees from 0 degrees to 360 degrees to test changes. Four patients with mean age of 11 and Cobb's angle of 30 degrees were recruited and the results showed that the low-power prisms at specific orientations (157.5 degrees and 180 degrees) could cause positive postural changes (2.1 degrees-2.7 degrees reduction of angle of trunk mis-alignment) measured by 3-D motion analysis. This might be used for controlling their scoliotic curves by induced visual bio-feedback. Apart from this laboratory test, a longitudinal study is necessary to investigate the long-term effect of the prisms at different powers and orientations (under both static and dynamic situations) on the patient's posture, spinal muscular activities, vision, eye-hand coordination, psychological state and other daily activities before it becomes an alternative management of AIS.

'Like a friend going round': reducing the stigma attached to mental healthcare in rural communities

Traditionally, stigma is seen as something that is the fault of the mental health system, and that involves an individual suffering social disapprobation and reduced life chances as a result of having been given a diagnostic label and an identity as a patient as a result of their contact with psychiatric institutions. The present study, based on focus group discussions conducted with users and mental healthcare workers in a rural setting, suggests that this classic conception of stigma does not readily apply to care in the community. First, workers described themselves as actively trying to challenge stigma at an institutional level, as well as being apt to change their own practice to reduce the stigmatizing effect of mental healthcare on their clients and make their presence less conspicuous. The ideal was to be 'like a friend going round'. However, this view included a somewhat passive notion of clients. By contrast, the present investigation showed that clients described themselves in much more active terms as being aware of possible sources of stigma and being inclined to challenge negative attitudes themselves. Future mental healthcare practice could draw upon professionals' stock of knowledge as to how their practice could lead to less stigma and could build upon clients' own strengths to achieve stigma reduction.

Does smoking increase relapse rates in Graves' disease?

We wondered whether the relapse rate of Graves' hyperthyroidism was increased amongst patients who smoked. To this end, a retrospective analysis of clinical and laboratory data of consecutive patients with Graves' disease was carried out. All patients were treated with thionamide anti-thyroid drugs (ATD) for at least one year and remission was defined as continued and biochemical euthyroidism, at least 6 months after discontinuing ATD. The study comprised 221 subjects with Graves' disease from a hospital-based population over 9 years. We took the following variables into account when assessing contribution to disease relapse: Goiter, Thyroid Associated Ophthalmopathy (TAO), and Time to euthyroidism after starting ATD and interaction between smoking and sex. Smoking had a marginally significant (p=0.081) deleterious effect on the likelihood of remission after ATD treatment for Graves' disease. The effect of smoking was, however, highly significant in males and indeed the deleterious effect on remissions may be restricted to males (odds ratio, 11.1; 95% confidence interval, 1.25 to 98.5). The presence of goiter (odds ratio, 3.8; 95% confidence interval, 2.05 to 7.1) and TAO (odds ratio, 1.8; 95% confidence interval, 0.993 to 3.18) forecasted lower chances of achieving remission. The shorter the time a patient became euthyroid after starting ATD the more likely his disease was to remit. We conclude that cigarette smoking increases the likelihood of Graves' disease recurrence in males treated with anti-thyroid drugs. Thus, smoking appears to be an important risk factor in the pathogenesis and outcome of Graves' disease patients at least in subsets of patients.