Molecular approaches to the identification of Bulinus species in south-west Nigeria and observations on natural snail infections with schistosomes.

The current study considers the distribution of a small sample of 138 Bulinus snails, across 28 localities within eight Nigerian states. Snails were identified using a combination of molecular methods involving both DNA sequencing of a partial cytochrome oxidase subunit 1 (cox1) fragment and restriction profiles obtained from ribosomal internal transcribed spacer (its) amplicons. The results showed that the majority of Bulinus samples tested belonged to the species Bulinus truncatus while only two were Bulinus globosus. The use of RsaI restriction endonuclease to cleave the ribosomal its of Bulinus, as a method of species identification, was adopted for the majority of samples, this being a quicker and cheaper method better suited to small laboratory environments. Polymerase chain reaction (PCR) amplification of the schistosome Dra1 repeat within each of the collected Bulinus samples was employed to determine the extent and distribution of infected snails within the sample areas. Successful amplification of the Dra1 repeat demonstrated that 29.7% of snails were infected with schistosomes. Sequencing of the partial schistosome its from a small subset of snail samples suggested that some snails were either penetrated by both Schistosoma haematobium and Schistosoma bovis miracidia or hybrid miracidia formed from the two species.

Care of the aged: old problems in need of new solutions.

Long-term care for the aged in the United States is overly dependent upon the nursing home. This hospital-like model for long-term care is particularly inappropriate since it imposes a medical solution on a variety of social problems. An adequate long-term care program requires a range of resources in the community as well as in institutions; sheltered housing options seem a desirable alternative to the nursing home. To ensure the quality of nursing home care, the present focus on setting standards for care activities should be abandoned in favor of a focus on care outcomes (physical, mental, and social). In an effort to change our present perverse incentives in the nursing home industry, the proposal is made that nursing homes be reimbursed according to the degree to which patient outcomes meet predicted outcomes.

Inter-specific parasite competition: mixed infections of Schistosoma mansoni and S. rodhaini in the definitive host.

Competition between parasite species has been predicted to be an important force shaping parasite and host ecology and evolution, although empirical data are often lacking. Using the Mus musculus-Schistosoma mansoni and Schistosoma rodhaini host-parasite systems we characterized mate choice and inter-specific competition between these two schistosome species. Simultaneous infections revealed species-specific mate preferences for both species as well as suggesting mating competition, with male S. rodhaini appearing dominant over male S. mansoni. S. rodhaini homologous pairs were also shown to have increased reproduction per paired female in the presence of a competitor in simultaneous infections. Overall total reproductive success was, however, similar between the two species under conditions of direct competition due to the greater initial infectivity of S. mansoni in comparison to S. rodhaini. Inter-specific competition was also implicated as increased parasite virulence to the host. The potential effects of such interactions on parasite and host ecology and evolution in nature are discussed.

Biliary tract obstruction secondary to cancer: management guidelines and selected literature review.

Malignant biliary tract obstruction (MBTO) due to either primary biliary tract cancer or metastasis to the porta hepatis is a common clinical problem. The most common metastatic tumors causing MBTO in order of frequency are gastric, colon, breast, and lung cancers. Radiographic diagnostic procedures should proceed in a cost-effective sequence from ultrasonography, computerized tomography (CT), percutaneous transhepatic cholangiography (PTHC), and endoscopic retrograde pancreatography with the goal of establishing the site of the biliary tract obstruction. The identification of the site of obstruction could be established by ultrasound 70% to 80%, CT scan 80% to 90%, PTHC 100%, and endoscopic retrograde cholangiography (ERCP) 85%. Therapeutic intervention by radiographic decompression (PTHC or endoscopic prosthesis), surgical bypass, or radiation therapy with or without chemotherapy may be selectively used based on (1) the site of obstruction; (2) the type of primary tumor; and (3) the presence of specific symptoms related to the obstruction. ("Prophylactic" biliary tract decompression to prevent ascending cholangitis is not supported by the literature in that the frequency of sepsis in the face of malignant obstruction is small (in contrast to sepsis associated with stone disease). Furthermore, PTHC with drainage as a long-term procedure is associated with a substantial frequency of sepsis and is unnecessary and possibly problematic as a preoperative procedure simply to reduce the bilirubin level. The use of radiation therapy in conjunction with chemotherapy for patients not deemed suitable for a surgical bypass because of the presence of proximal obstruction is an important alternative to PTHC.

Beyond labels: nursing home care for Alzheimer's disease in and out of special care units.

OBJECTIVE: To compare dementia special care units (SCUs) with their non-SCU counterparts in terms of unit and facility characteristics. DESIGN: Cross-sectional telephone survey and secondary database. SETTING: 1247 units in 436 Minnesota nursing homes. MEASUREMENTS: Specialized dementia care practices (e.g., staffing, environmental design and programming features) and organizational characteristics (e.g., size, geographic location, type of ownership, proportion dementia, case-mix and percentage Medicaid). RESULTS: Comparing unit level data for all units in 436 facilities, we found that 75 SCUs offered more dementia-specific features than did the 1122 units not designated as SCUs, but most units offered some dementia-specific features similar to those of SCUs. The designation of SCU did not automatically translate into richer or more tailored services for dementia compared with units without the designation. Facilities with designated SCUs are more likely to be rural, larger and divided into more units, have a higher proportion of residents with dementia, and have fewer residents at higher levels of acuity. CONCLUSION: Presence of a SCU in a facility may be related to care of dementia in the rest of the nursing home in complex ways; some dementia-specific features were less likely to be found in regular units of nursing homes with designated SCUs.

Perceptions of urban versus rural hospital patients about return to their communities.

During a two-month period in 1976, male patients scheduled to be discharged from two Veterans Administration Hospitals, who were aged 55 or older, chronically ill, able to communicate rationally, and had been hospitalized at least a week for the current illness, were interviewed prior to discharge. Information was sought regarding their feelings about admission and discharge, the availability of and their need for 13 related health-related services at home, and the informal support systems available to them in their local communities. Comparisons were made between patients from distinctly rural settings (communities with less than 5,000 population) and those from larger towns or cities. Both urban and rural patients were modest in assessment of their own health-related needs, especially their need for social and ancillary health services. In almost all instances, the perceived availability exceeded perceived needs. Rural dwellers reported somewhat less apprehension about entering the hospital; they also reported more social contact in their home communities despite the fact that in this sample the rural dwellers were more likely to be older, widowed, and living alone. Rural dwellers were slightly more likely to have their own family doctor.

Everyday matters in the lives of nursing home residents: wish for and perception of choice and control.

OBJECTIVES: This study examined the importance that nursing home residents and nursing assistants ascribed to control and choice over everyday issues, the satisfaction of residents with their control and choice over these issues, and the nursing assistants' impressions of the extent to which control and choice exist for nursing home residents on everyday matters. DESIGN: Cross-sectional in-person interviews with a stratified representative sample of nursing home residents and nursing assistants using semi-structured interview protocols with both fixed-choice and open-ended questions. SETTING: A random sample of 25 nursing homes in the Twin Cities, MN area; a random sample of five nursing homes in North Little Rock, AR; all five nursing homes in Sante Fe, NM; and five purposively selected nursing homes in each of New York City and Los Angeles, CA. PARTICIPANTS: One hundred thirty-five cognitively intact residents, three from each facility, were selected and included the resident council chair, one randomly selected short-stay resident, and one randomly selected long-stay resident from each facility. Also participating were 134 nursing assistants (1 selected randomly from each shift from those employed at least two-thirds time and who had worked in the facility for at least 3 months). MEASUREMENTS: The most important measurements were ordinal-level ratings of the importance of choice and control for nursing home residents over 10 selected areas of everyday life; ordinal measures of residents' satisfaction with their choice and control over these areas; and nursing assistants' ratings of the extent to which they thought it possible for residents to achieve choice and control. Open-ended comments were also elicited. Also measured were demographic data, ADL status, frequency of trips away from the nursing home, frequency of receiving visitors, and (for nursing assistants) length of employment, wages, job satisfaction, and extent to which they knew the residents under their care. MAJOR RESULTS: Cognitively intact nursing home residents attach importance to choice and control over matters such as bedtime, rising time, food, roommates, care routines, use of money, use of the telephone, trips out of the nursing home, and initiating contact with a physician. Nursing assistants view such control as important to residents. Residents and staff differ significantly in the importance attached to particular items, with staff placing lower importance than residents on use of the telephone and personal expenditures and higher importance on control and choice over visitors and formal nursing home activities. Residents were not very satisfied with their control and choice, and nursing assistants viewed them as unlikely to experience control and choice. Nursing home, resident, and staff characteristics were not associated with the patterns of results. CONCLUSIONS: A self-defeating cycle has been identified where neither resident nor staff are optimistic about achieving more resident control and choice, which both groups perceive as desirable. To end this cycle, suggestions are offered for structuring the role of the nursing assistant, physician and nurse leadership, changes in nursing home routines and practices, and public policy changes.

Prospective comparison of preoperative imaging and intraoperative ultrasonography in the detection of liver tumors.

A prospective evaluation of the accuracy of preoperative computed tomography (CT), ultrasonography (US), and angiography was performed in 54 patients undergoing resection of hepatic neoplasms. The results were compared with surgical findings and intraoperative ultrasonography (IOUS). A total of 167 lesions was seen by means of IOUS, of which preoperative US enabled detection of 127 (76%). In 48 patients CT allowed detection of 91 of 150 lesions (61%), and in 35 patients angiography showed 56 of 107 lesions (52%). When the detection rate is analyzed according to hepatic segment, the greater overall accuracy of preoperative US may be attributed to a markedly better detection rate in lateral segment of the left lobe of the liver. Lesion size also represented a factor, with preoperative US allowing detection of a greater number of small (less than 2 cm) lesions compared with CT. In patients studied with both CT and US, the combined lesion-detection rate increased to 81% in the right lobe and 76% in the left lobe. Because of this we recommend that preoperative assessment include both CT and US evaluation of the liver. IOUS showed 25% to 35% additional lesions compared with preoperative US and CT. More importantly, 40% of the lesions demonstrated by IOUS were neither visible nor palpable at surgery. We recommend that IOUS be considered in all patients in whom resection of hepatic neoplasm is planned.

Multimodality treatment of hepatocellular carcinoma in a hepatobiliary specialty center.

OBJECTIVES: To review the experience of the treatment of hepatocellular carcinoma by a single multimodality team during a 6-year period, including all patients who were referred for possible surgical intervention, to evaluate prognostic factors at presentation, and to determine the results of the different modalities of treatment that were used. DESIGN: Retrospective study of 154 patients who were referred to our Hepatobiliary Surgical Unit with the diagnosis of hepatocellular carcinoma from January 1988 through August 1995. SETTING: Tertiary care center. RESULTS: Methods of treatment included surgical resection (n=49), transplantation (n=22), hepatic artery chemoembolization (n=30), systemic chemotherapy (n=25), and no treatment (n=22). Predictive prognostic factors included coexisting cirrhosis, symptoms at presentation, and abnormal liver function test results. Unfavorable tumor characteristics were size (diameter, >5 cm) and multicentricity. For patients who underwent surgical exploration, advanced staging according to the manual of the American Joint Committee on Cancer, vascular invasion, and a margin of less than 1 cm in the group for patients who underwent resection impacted negatively on the prognosis. The median survival (42.4 months) for the group of patients who underwent resection was significantly higher than that for the groups of patients who did not undergo resection. Chemoembolization was associated with significantly better survival results than was systemic chemotherapy. CONCLUSIONS: Hepatic resection offers the best chance at cure for patients with hepatocellular carcinoma. The high association between hepatocellular carcinoma and cirrhotic liver disease makes surgical resection, even in favorable tumor types, a difficult task based on low hepatic reserve whose tumors are considered unresectable can be considered for chemoembolization. Liver transplantation should be reserved for selected patients with cirrhotic liver disease who have tumors (diameter, <5 cm) in the contest of neoadjuvant protocols.

What older people want from long-term care, and how they can get it.

Seniors' long-term care preferences resemble those of younger persons with disabilities, but the two groups are treated differently. Younger persons with disabilities pursue the goal of social integration, whereas safety and efficiency receive undue emphasis and ageist differences prevail in the way older persons are served. Among the changes needed to help older consumers get what they want are empowering older persons and their agents to make better decisions, including providing them with more structure and better consumer information; revising attitudes toward safety and protection; and developing more vigorous advocacy by and for seniors.

Intraoperative ultrasound.

Intraoperative ultrasound is an exciting arena for real-time depiction and evaluation of relevant anatomy and pathology. The information provided by this technique often is pivotal to the surgeon, and not infrequently impacts the nature and extent of the surgical procedure. As more radiologists develop an interest and become facile with IOUS, and as more surgeons appreciate the benefits of this modality, the numbers and applications for this technique will continue to expand. This, coupled with continued commercial and technical improvements, and increasing demand for minimally invasive surgery, ensures that the future of IOUS will be a bright one.

Application of single strand conformational polymorphism (SSCP) analysis with fluorescent primers for differentiation of Schistosoma haematobium group species.

To assess the utility of single-stranded conformational polymorphism (SSCP) analysis for the differentiation of schistosomes, using methods adapted for a Perkin Elmer ABI Prism 377 automated sequencer, 3 isolates of Schistosoma haematobium, 2 of S. intercalatum and single isolates of S. curassoni and S. bovis were selected for study. Two fluorescently labelled, double-stranded polymerase chain reaction products, amplified from the mitochondrial cytochrome oxidase subunit 1 (CO1) gene and the nuclear ribosomal second internal transcribed spacer (ITS2), were generated from single male and female worms. Changes in electrophoretic mobility of fragments within an SSCP profile revealed variation at individual, isolate and species levels. The mutational basis between representative SSCP profiles was confirmed by direct sequencing, demonstrating that single point substitutions were detectable. SSCP analysis has considerable potential as an alternative molecular method of identification and characterization of schistosomes. More broadly, fluorescence-based SSCP analysis is applicable to almost any gene target from any species of parasite and is a powerful molecular tool for genetic profiling.

Development of cloned DNA probes for the identification of snail intermediate hosts within the genus Bulinus.

DNA fragments have been isolated from Bulinus cernicus and cloned in Escherichia coli strain JM109 using pUC18 as the vector. Four recombinant plasmids designated pBC123, pBC126, pBC127 and pBC134 were selected for further analysis and were shown by both dot and Southern blot hybridisations to have different specificities to species representing the four species groups of Bulinus. Non-specific hybridisation occurred with pBC126 whereas pBC123 and pBC134 hybridised only to B. cernicus. Partial restriction maps of the inserts revealed sequence differences between pBC123 and pBC134. Intermediate specificity was shown by pBC127 as this probe hybridised only to DNA from snails of the B. forskalii group and B. truncatus of the B. truncatus/tropicus complex. The results demonstrate the potential of DNA probes for the identification and characterisation of intermediate hosts of schistosomes.

Effects of post-hospital Medicare home health and informal care on patient functional status.

OBJECTIVE: To examine the effect of post-hospital Medicare home health and informal care on the functional status of 755 Medicare beneficiaries six weeks after hospital discharge for treatment of stroke, chronic obstructive pulmonary disease (COPD), congestive heart failure (CHF), hip procedures, and hip fractures. STUDY SETTING/DATA SOURCES: Consecutive patients enrolled in the study between March 1988 and February 1989 prior to discharge from one of 52 hospitals in three cities. Data sources included patient interviews, medical records, and the Medicare Automated Data Retrieval System (MADRS). ANALYSIS: The effect of the two types of care on patients' subsequent functional status was estimated using a selectivity corrected least squares regression of functional status six weeks post-discharge on hours of informal care, Medicare home health expenditures, and patient prior functional and cognitive status. DATA COLLECTION/EXTRACTION METHODS: Patients were interviewed before hospital discharge and six weeks later. The patient's primary caregiver was interviewed by telephone six weeks post-discharge. Patient data included demographic characteristics, illness severity, cognitive status, functional status at discharge and six weeks later, post-discharge expenditures for Medicare home health, and hours of informal care. PRINCIPAL FINDINGS: More informal care after discharge was associated with greater patient functional impairment six weeks later. The amount of Medicare home health that patients used had a nonsignificant effect on subsequent functional status. CONCLUSIONS: Post-acute home care may maintain the patient at home and compensate for functional limitations, rather than promote restoration of function. Future studies are needed to examine the effects of specific types of care, services, and providers as well as factors that mediate their effects on patient functional outcomes.

Outcome trajectories for assisted living and nursing facility residents in Oregon.

OBJECTIVE: To compare assisted living residents and nursing home residents on outcome trajectories for three outcomes: ability to perform activities of daily living (ADLs), psychological well-being, and pain and discomfort. DATA SOURCES/STUDY SETTING: A representative sample of one-third of the census from 38 participating assisted living facilities (N = 605) and two-fifths of the census from 31 participating nursing facilities (N = 610). STUDY DESIGN: A longitudinal design using hierarchical linear models to examine how setting (being in an assisted living setting or in a nursing home) affected growth trajectories for each outcome studied when adjusting for other resident characteristics. DATA COLLECTION: Residents or their proxies were interviewed and chart reviews done at baseline, six months, and one year. All baseline data were collected between August 1995 and May 1996. PRINCIPAL FINDINGS: We found differences in case mix between assisted living and nursing facility residents but no differences in outcome trajectories for ADLs, psychological well-being, and pain and discomfort. For ADLs and pain and discomfort on average, residents in both settings experienced change over the study period. For psychological well-being, residents experienced no change on average. CONCLUSIONS: The lack of difference in growth trajectories for ADLs, pain and discomfort, and psychological well-being between the two settings was noteworthy.

Control of massively bleeding arterioportal fistula using a balloon catheter.

The commercial availability of double-lumen balloon catheters has added a new tool for the angiographer in controlling gastrointestinal bleeding. Our report describes a situation in which the unique properties of this catheter were quite effective in controlling life-threatening hemorrhage.

Modeling the costs of case management in long-term care.

A conceptual approach to developing models for analyzing cost is applied to case management in long-term care. This conceptual approach uses four dimensions to classify case management programs. The application results in identifying five case management cost models. Empirical measures of case management costs and a set of determinants of the within-model variation in these costs are suggested for each model. This article discusses several policy relevant hypotheses that could be addressed by the empirical implementation of these cost models.

Perspectives on home care quality.

Home care quality assurance (QA) must consider features inherent in home care, including: multiple goals, limited provider control, and unique family roles. Successive panels of stakeholders were asked to rate the importance of selected home care outcomes. Most highly rated outcomes were freedom from exploitation, satisfaction with care, physical safety, affordability, and physical functioning. Panelists preferred outcome indicators to process and structure, and all groups emphasized "enabling" criteria. Themes highlighted included: interpersonal components of care; normalizing life for clientele; balancing quality of life with safety; developing flexible, negotiated care plans; mechanisms for accountability and case management. These themes were formulated differently according to the stakeholders' role. Providers preferred intermediate outcomes, akin to process.

Imaging of primary and metastatic liver tumors.

Innovative liver surgical techniques are allowing improved survival for patients with liver tumors. To effectively plan this surgery, both the number and precise location of all lesions must be accurately documented. Numerous technical advances have occurred in cross-sectional imaging techniques for evaluating liver tumors. These improvements have increased the sensitivity of US, CT and MR for detecting primary and metastatic liver neoplasms. Depending on the specific clinical information required, such as extrahepatic spread of diseases or hepatic vascular invasion, each modality has its strengths and drawbacks. The specific choice of technique should be decided in consultation with the radiologist who interprets the studies. Both benign and malignant lesions may coexist in the same liver and, because this affects patient management and prognosis, care should be taken to evaluate each lesion that is identified. Tumors also may be simulated by pseudolesions such as focal fatty sparing or infiltration, regenerative nodules, or hepatic arterial perfusion defects. To best evaluate liver malignancies, a sensible combination of imaging modalities, depending on the patient population, radiologic strengths, and imaging equipment available, is recommended to provide the best overall assessment of the number and location of liver neoplasms.