A d.c. magnetic metamaterial.

Electromagnetic metamaterials are a class of materials that have been artificially structured on a subwavelength scale. They are currently the focus of a great deal of interest because they allow access to previously unrealizable properties such as a negative refractive index. Most metamaterial designs have so far been based on resonant elements, such as split rings, and research has concentrated on microwave frequencies and above. Here, we present the first experimental realization of a non-resonant metamaterial designed to operate at zero frequency. Our samples are based on a recently proposed template for an anisotropic magnetic metamaterial consisting of an array of superconducting plates. Magnetometry experiments show a strong, adjustable diamagnetic response when a field is applied perpendicular to the plates. We have calculated the corresponding effective permeability, which agrees well with theoretical predictions. Applications for this metamaterial may include non-intrusive screening of weak d.c. magnetic fields.

The health of caregivers for children with disabilities: caregiver perspectives.

BACKGROUND: There are an estimated 5.9 million children with severe disabilities in the USA, and most of them are cared for at home by their parents and families. Indirect evidence suggests that poor caregiver health may contribute to recurrent hospitalizations and out-of-home placements for children with chronic conditions and disabilities. Greater knowledge of caregiver health-related needs would allow for the improvement of existing services and the development of new strategies to sustain caregivers in their vital roles. This study explores caregiver perspectives of the health implications of long-term informal caregiving for children with disabilities. METHODS: Forty parents/caregivers of children with disabilities residing in urban, suburban and rural regions of Utah completed questionnaires and participated in focus groups that explored their feelings regarding their current physical and emotional health and the factors that they viewed as either impairing or promoting their health. The sessions were audiotaped and transcribed. Summary statistics were generated for the questionnaire responses. Focus group content was analysed according to emerging themes and patterns in clusters of information. RESULTS: The caregiving experience was captured by five themes: (i) stress of caregiving; (ii) negative impact on caregiver health; (iii) sharing the burden; (iv) worry about the future; and (v) caregiver coping strategies. Forty-one per cent of the caregivers reported that their health had worsened over the past year, and attributed these changes to a lack of time, a lack of control and decreased psychosocial energy. CONCLUSIONS: Caregivers of children with disabilities describe negative physical, emotional and functional health consequences of long-term, informal caregiving. They have important insights regarding those aspects of caregiving that have positive and negative influences on their health. Interventions that address these issues may have the potential to positively impact caregiver health.

A self-management program for adult asthma. III. Maintenance and relapse of skills.

Patient self-management programs have become an integral part of asthma treatment. The goal of such programs is to strengthen the partnership between patients and health care providers in controlling the condition. The present study analyzed how well patients maintained or relapsed in performing asthma self-management skills over time and across settings. It was conducted by contacting patients who had been involved in a successful self-management program an average of 6 years after their participation or an average of 7 years after they completed training. Seventy percent of the patients agreed to participate and complete, either by themselves or over the telephone, a structured interview regarding their experiences in performing asthma self-management. On the basis of their responses, 53 participants were categorized into two groups: continuers or relapsers, according to previously developed and published criteria for relapse. Characteristics that distinguished the two groups were described. As anticipated, those classified as continuers reportedly exhibited broader repertoires of self-management skills across an array of settings. They credited their performance with maintaining control over their asthma. However, two unexpected findings emerged in the study: First, all patients continued to use self-management skills to one degree or another 7 years after they had acquired these skills. Even patients who were categorized as relapsers regularly performed some self-management skills, often involving self-monitoring of their breathing. Second, half of the patients in the relapse group reported that their asthma was in remission and that they were asymptomatic. The self-management skills they reportedly used were performed to monitor and prevent a return of asthma.

Diagnosis of acute cholecystitis: sensitivity of sonography, cholescintigraphy, and combined sonography-cholescintigraphy.

BACKGROUND: Radiographic diagnosis of acute cholecystitis can be established using ultrasonography (US), cholecystoscintigraphy (HIDA), or both. Although both modalities have been effective in diagnosing acute cholecystitis (AC), physicians from the emergency department and admitting surgeons continue to request both tests in an attempt to increase the diagnostic accuracy of AC. This article reports the institutional experience of a large tertiary care health care facility, with respect to the sensitivity of US, HIDA, and combined US and HIDA. STUDY DESIGN: We conducted a retrospective review of 132 patients diagnosed with AC who underwent laparoscopic cholecystectomy during the same hospitalization. Patients were stratified into three groups: Group 1 (Gp1, n = 50) included patients who underwent US alone, group 2 (Gp2, n = 28) included patients who underwent HIDA scan alone, and group 3 (Gp3, n = 54) included patients who underwent both US and HIDA. RESULTS: The three groups did not differ with respect to age, liver chemistry, time to operation, and hospital length of stay. The sensitivity of US, HIDA, and combined US/HIDA as diagnostic modalities for acute cholecystitis was referenced to histopathologic confirmation. Sensitivity was 24 of 50 (48%), 24 of 28 (86%), and 49 of 54 (90%) for US, HIDA, and the combination of US/HIDA, respectively. CONCLUSIONS: HIDA scan is a more sensitive test than US in diagnosing patients with AC. Based on the results of this study, we recommend that HIDA scan should be used as the first diagnostic modality in patients with suspected acute cholecystitis; US should be used to confirm the presence of gallbladder stones rather than to diagnose AC.

Salvage of TRAM flaps with compromised venous outflow.

A simple and effective technique is described for salvaging TRAM flaps with venous compromise. This has proven to be a valuable supplement to our technical armamentarium.

Repair of anal stricture and mucosal ectropion by simple flap procedures.

A technique is described that has proven most effective in correction of postoperative anal stenosis. A modification of this technique also has proven effective in the treatment of symptomatic anal mucosal ectropion--a condition marked by pruritus and perianal soilage from mucosal weeping, usually associated with the Whitehead hemorrhoidectomy. The design of the flap allows primary closure of the donor site and tension-free flap inset with a robust flap blood supply.