Stresses in Polyethylene Liners in a Semiconstrained Ankle Prosthesis

A finite element model of a semiconstrained ankle implant with the tibia and fibula was constructed so that the stresses in the polyethylene liner could be computed. Two different widths of talar components were studied and proximal boundary conditions were computed from an inverse process providing a load of five times body weight appropriately distributed across the osseous structures. von Mises stresses indicated small regions of localized yielding and contact stresses that were similar to those in acetabular cup liners. A wider talar component with 36% more surface area reduced contact stress and von Mises stresses at the center of the polyethylene component by 17%.

The VEPSY UPDATED Project: clinical rationale and technical approach

More than 10 years ago, Tart (1990) described virtual reality (VR) as a technological model of consciousness offering intriguing possibilities for developing diagnostic, inductive, psychotherapeutic, and training techniques that can extend and supplement current ones. To exploit and understand this potential is the overall goal of the "Telemedicine and Portable Virtual Environment in Clinical Psychology"--VEPSY UPDATED--a European Community-funded research project (IST-2000-25323, www.cybertherapy.info). Particularly, its specific goal is the development of different PC-based virtual reality modules to be used in clinical assessment and treatment of social phobia, panic disorders, male sexual disorders, obesity, and eating disorders. The paper describes the clinical and technical rationale behind the clinical applications developed by the project. Moreover, the paper focuses its analysis on the possible role of VR in clinical psychology and how it can be used for therapeutic change.

Repeated treatment with the synthetic cannabinoid WIN 55,212-2 reduces both hyperalgesia and production of pronociceptive mediators in a rat model of neuropathic pain

The antinociceptive properties of cannabinoids in persistent pain are not fully elucidated. We investigated the effect of repeated treatment with the synthetic cannabinoid receptor agonist WIN 55,212-2 on the neuropathic pain induced in rats by chronic constriction of the sciatic nerve. WIN 55,212-2 administered daily throughout the development of neuropathy reversed the hyperalgesia, at a dose (0.1 mg x kg(-1), s.c.) that had no effect on the nociceptive responses of either paw contralateral to the sciatic ligation or of animals subjected to sham surgery. At 14 days after injury, the levels of mediators known to be involved in neuropathic pain, such as prostaglandin E2, NO and the neuronal NOS, were increased. Repeated treatment with WIN 55,212-2 abolished these increases. In the light of the current clinical need for neuropathic pain treatments, these findings indicate that cannabinoid agonists, at doses devoid of psychoactive effects, could constitute important compounds for the development of new analgesics.

First Italian report of onychomycosis caused by Onychocola canadensis

Onychocola canadensis is a non-dermatophytic mould that has been associated with onychomycosis particularly in temperate climates. Until now, O. canadensis has been isolated from patients in Canada (14 cases), New Zealand (three), France (nine), UK (four) and Spain (two). We describe the first Italian case of onychomycosis caused by this fungus.

Gender differentials in life expectancy in Italy

OBJECTIVE

To analyze the gender differential in life expectancy in Italy from 1970 to 1997, to determine which ages and causes of death mostly influenced its trend.

METHODS

Pollard method was used to explain which ages and which pathologies give the highest contribution to the gender differential.

RESULTS

A slight reduction of the gender differential has been observed since 1980. The olds and very olds became the most relevant contributors to the differential. Cardiovascular diseases were the principal contributing causes of death until 1980 and Cancer replaced them afterwards.

CONCLUSION

Relatively recent adoption of unhealthy life styles by women together with an opposite process run by young men towards healthier behaviour, seem to be at the basis of the slight reduction of the gender differential in life expectancy observed since 1980.

Six-month follow-up of in-patient experiential cognitive therapy for binge eating disorders

Treating binge eating disorders is not easy: the disordered eating is usually combined with a patient who is overweight and often obese. As underlined by the current literature, treatment outcome must focus, at a minimum, on the binge eating characterizing this disorder, on weight changes, and preferably also changes in co-morbid psychopathology. To address these issues, cognitive behavioral therapy (CBT) is still considered the best approach. However, if we check the results of follow-up studies, different authors reported some relapse in the frequency of binge eating and small weight gains over the follow-up period. This paper describes the 6-month follow-up outcome of the Experiential Cognitive Therapy (ECT), a multi factorial treatment for binge eating disorders, including virtual reality therapy. These results are compared in a randomized controlled trial (n = 36) with the ones obtained by CBT and nutritional groups only. The results showed that 77% of the ECT group quit binging after 6 months versus 56% for the CBT sample and 22% for the nutritional group sample. Moreover, the ECT sample reported better scores in most psychometric tests including EDI-2 and body image scores.

Biotechnological approaches to the production of idiotypic vaccines and antiidiotypic antibiotics

The potential therapeutic activity of a killer toxin produced by the yeast Pichia anomala (PaKT) characterized by its wide spectrum of antimicrobial activity has been exploited through the simulation of its interaction with the specific cell wall receptor (KTR) of PaKT-sensitive microorganisms by the idiotypic network. Killer antiidiotypes (PaKTantiId) produced by idiotypic vaccination with a PaKT-neutralizing monoclonal antibody have proven to confer active and passive immunoprotection in experimental models of systemic and vaginal candidiasis. PaKTantiId-like human anti-KTR antibodies are naturally produced in infections caused by PaKT-sensitive microorganisms. PaKTantiId in its monoclonal and recombinant formats as well as expressed on human commensal bacteria have shown microbicidal activity in vitro and a therapeutic effect in experimental models of infection caused by PaKT-sensitive microorganisms. New perspectives of idiotypic vaccination and antiidiotypic antibiotic therapy and biotechnological approaches to the production of trandisease idiotypic vaccines and wide-spectrum antiidiotypic antibiotics (killer mimotopes) will be discussed as effective tools to fight epidemiologically important mucosal and systemic microbial infections.

Multicenter comparative evaluation of six commercial systems and the national committee for clinical laboratory standards m27-a broth microdilution method for fluconazole susceptibility testing of Candida species

Fluconazole susceptibility among 800 clinical Candida isolates (60% C. albicans) and two control strains (C. krusei ATCC 6258 and C. parapsilosis ATCC 22019) was tested with the NCCLS M27-A method (gold standard) and six commercial products (Candifast, disk, Etest, Fungitest, Integral System Yeasts, and Sensititre YeastOne). Results were classified as susceptible, susceptible-dose dependent, or resistant using M27-A breakpoints or, for Fungitest, Integral System Yeasts, and Candifast, as susceptible, intermediate, or resistant, according to the manufacturers' instructions. Concordance with NCCLS M27-A results was analyzed with the chi(2) test. Intra- and interlaboratory reproducibility was also evaluated. NCCLS M27-A (90.1%), Etest (93.1%), Sensititre YeastOne (93.1%), disk (96.7%), Fungitest (92.6%), Integral System Yeasts (40.6%), and Candifast (6.0%) classified the indicated percentages of C. albicans isolates as susceptible. Among non-C. albicans strains, the percentages of susceptible isolates were as follows: NCCLS M27-A, 74.0%; Etest, 83.8%; Sensititre YeastOne, 64.1%; disk, 60.6%; Fungitest, 76.6%; Integral System Yeasts, 28.3%; and Candifast, 27.4%. All methods except Candifast and Integral System Yeasts showed good agreement with NCCLS M27-A results for both C albicans and non-C. albicans isolates. Intralaboratory reproducibility was excellent for NCCLS M27-A, Etest, Sensititre YeastOne, disk, and Fungitest (88 to 91%). Similar results emerged from the interlaboratory reproducibility evaluation. Our findings indicate that some commercial methods can be useful for fluconazole susceptibility testing of clinical Candida isolates. Those characterized by a lack of medium standardization and/or objective interpretative criteria should be avoided. Particular caution is necessary when testing is being done for clinical and epidemiological purposes.

Recombinant Streptococcus gordonii for mucosal delivery of a scFv microbicidal antibody

The gram-positive bacterium Streptococcus gordonii was engineered to express the microbicidal molecule H6, which is an antiidiotypic single chain antibody mimicking a yeast killer toxin. S. gordonii is a human commensal which we developed as a model system for mucosal delivery of heterologous proteins. The in vivo candidacidal activity of both H6-secreting and H6-surface-displaying streptococcal strains were assayed in a well-established rat model of vaginal candidiasis. At day 21 full clearance of Candida albicans infection was observed in 75% of animals treated with the H6-secreting strain, and in 37.5% of animals treated with the strain expressing H6 on the surface, while all animals treated with the control strain were still infected. The observed candidacidal effect was comparable with that observed with the antimycotic drug fluconazole. These data confirm the potential of H6 as a candidacidal agent and show how promising is the approach of using recombinant bacteria for mucosal delivery of biologically active molecules.

Drinking pattern and mortality: the Italian Risk Factor and Life Expectancy pooling project

PURPOSE

To analyze the relationship between an aspect of drinking pattern (i.e., drinking with or without meals) and risk of all-cause and specific-cause mortality.

METHODS

The Risk Factors and Life Expectancy Study, is a pooling of a series of epidemiological studies conducted in Italy. Eight-thousand six-hundred and forty-seven men and 6521 women, age 30-59 at baseline, and free of cardiovascular disease, were followed for mortality from all causes, cardiovascular and noncardiovascular, during an average follow-up of 7 years.

RESULTS

Drinkers of wine outside meals exhibited higher death rates from all causes, noncardiovascular diseases, and cancer, as compared to drinkers of wine with meals. This association was independent from the cardiovascular disease (CVD) risk factors measured at baseline and the amount of alcohol consumed and seemed to be stronger in women as compared to men.

CONCLUSIONS

The present results indicate that drinking patterns may have important health implications, and attention should be given to this aspect of alcohol use and its relationship to health outcomes. The relationship between alcohol consumption and disease has been the focus of intensive scientific investigation (1-9). Most studies to date, however, have limitations. A major drawback is that limited information has been collected regarding the complex issue of alcohol consumption. In many studies, ascertainment of alcohol consumption frequently focused only on quantity of alcohol consumed without considering the many different components of alcohol consumption, particularly drinking pattern (10-12). It has been hypothesized, and preliminary data support the notion, that drinking pattern could have important influences on determining the health effects of alcohol (13,14). The present study examines the relationship between one aspect of drinking pattern (drinking wine outside meals) and mortality in a large cohort of men and women.

Long-term outcome of social phobia treated by exposure

BACKGROUND

There is very little information on long-term follow-up of social phobia.

METHODS

A consecutive series of 70 patients satisfying the DSM-IV criteria for social phobia was treated in an out-patient clinic with behavioural methods based on exposure homework. Forty-five patients were judged to be remitted after eight individual sessions of psychotherapy. A 2 to 12 year (median = 6 years) follow-up was performed. Survival analysis was selected to characterize the clinical course of patients. Assessments were performed before treatment, at the end of therapy, after 1 year, and subsequently on a yearly basis, and utilized selected items of Paykel's Clinical Interview for Depression.

RESULTS

Six of the 45 patients (13%) had a relapse of social phobia at some time during follow-up. The estimated cumulative percentage of patients remaining in remission was 98 after 2 years, 85 after 5 years and 85 after 10 years. Such probabilities increased in the absence of a personality disorder, of residual social phobic avoidance after exposure, and of concurrent use of benzodiazepines.

CONCLUSIONS

The findings suggest that, even though one patient out of three is unable to complete treatment or does not benefit sufficiently from it, exposure treatment can provide lasting effects to the majority of patients with social phobia. Disappearance of residual, subclinical social phobic avoidance appears to be the target of treatment.

Long-term outcome of panic disorder with agoraphobia treated by exposure

BACKGROUND

There is a paucity of long-term outcome studies of panic disorder that exceed a 2-year follow-up. The aim of the study was to evaluate the long-term follow-up of patients with panic disorder with agoraphobia treated according to a standardized protocol.

METHODS

A consecutive series of 200 patients satisfying the DSM-IV criteria for panic disorder with agoraphobia was treated in an out-patient clinic with behavioural methods based on exposure homework. One hundred and thirty-six patients became panic free after 12 sessions of psychotherapy and 132 were available for follow-up. A 2- to 14-year (median = 8 years) follow-up was performed. Survival analysis was employed to characterize the clinical course of patients.

RESULTS

Thirty-one of the 132 patients (23%) had a relapse of panic disorder at some time during follow-up. The estimated cumulative percentage of patients remaining in remission was 93.1 after 2 years, 82.4 after 5 years, 78.8 after 7 years and 62.1 after 10 years. Such probabilities increased with younger age, and in the absence of a personality disorder, of high pre-treatment levels of depressed mood, of residual agoraphobic avoidance after exposure, and of concurrent use of benzodiazepines and antidepressant drugs.

CONCLUSIONS

The findings suggest that exposure treatment can provide lasting relief to the majority of patients with panic disorder and agoraphobia. Disappearance of residual and subclinical agoraphobic avoidance, and not simply of panic attacks, should be the aim of exposure therapy.

The efficacy of acquired humoral and cellular immunity in the prevention and therapy of experimental fungal infections

In the past two decades, numerous studies have documented the importance of acquired immunity for host defense against invasive fungal infections. There is widespread consensus in the field of medical mycology that cellular immunity is critical for successful host defense against fungi. However, in recent years several studies have established the potential efficacy of humoral immunity in host protection against two major fungal pathogens: Candida albicans and Cryptococcus neoformans. For C. albicans, antibodies to mannan, proteases and a heat shock proteins have been associated with protection against infection. Furthermore, anti-idiotypic antibodies to antibodies recognizing killer toxin from Pichia anomala and mimicking natural anti-killer toxin receptor antibodies can protect against C. albicans and other microorganisms. For C. neoformans, antibodies to the capsular glucuronoxylomannan have been shown to mediate protection in animal models of infection. Vaccines that induce protective antibodies have been shown to protect against experimental C. albicans and C. neoformans infection. In contrast, humoral immunity has not yet been demonstrated to mediate protection against Coccidioides immitis. For C. immitis, protection against infection is thought to rely on T cell mediated immunity, and the emphasis is on identifying the antigens that stimulate protective cellular immune responses and several candidate vaccines have been identified. These results provide encouragement for the view that acquired immune responses can be mobilized for the prevention and treatment of fungal infections.

Killer anti-idiotypes in the control of fungal infections

Killer anti-idiotypes (KTantild) bear the internal image of a Pichia anomala toxin (KT), characterized by microbicidal activity against prokaryotic and eukaryotic pathogenic microorganisms presenting specific cell wall receptors (KTR). KTantiId produced by idiotypic vaccination with a KT-neutralizing monoclonal antibody confer active and passive immunoprotection in experimental models of systemic and vaginal candidiasis. KTantild-like human natural anti-KTR antibodies are produced in natural infections caused by KT-sensitive microorganisms. KTantiId in the monoclonal and recombinant forms show therapeutic activity in experimental vaginal candidiasis and Pneumocystis carinii pneumonia. Human commensal bacteria expressing KTantild or killer mimotopes synthesized from the sequence of KtantiId, may represent effective tools to combat fungal infections.

Differential impact of combined antiretroviral therapy on the survival of italian patients with specific AIDS-defining illnesses

BACKGROUND

A decrease in HIV-related mortality and morbidity has been observed since 1996 in most developed countries as a consequence of the extensive use of combined antiretroviral therapies. The purpose of this study was to investigate whether combined antiretroviral therapies had a differential impact on the survival of patients with different AIDS-defining illnesses (ADIs).

METHODS

In total, 35,318 persons representing all the adults with AIDS (PWAs) diagnosed in Italy from January 1, 1990 to August 31, 1998 were studied. Actuarial life tables and the Kaplan-Meier method were used to estimate the cumulative probability of survival; the multivariate Cox proportional hazards model was used to estimate adjusted relative hazard of death (RH).

RESULTS

Among PWAs diagnosed after 1995, the proportion of survivors 24 months after diagnosis was more than doubled (66%) compared with that of PWAs diagnosed before the end of 1995 (31%). Significantly decreased RHs for some ADIs were observed as early as 1996 (i.e., esophageal candidiasis, Pneumocystis carinii pneumonia, brain toxoplasmosis, HIV-wasting syndrome, and pulmonary tuberculosis). In the last period (1997-1998), the decrease was marked and significant for almost all the ADIs, ranging from 55% to 80% compared with the RHs of the reference year (1995). Conversely, primary lymphoma of the brain and Burkitt's lymphoma showed a low and not statistically significant decrease; these were the ADIs with the worst outcome.

CONCLUSIONS

After 1995, there was a rather uniform increase in the survival of PWAs diagnosed with most specific ADIs but not for patients affected by primary brain lymphoma and Burkitt's lymphoma. The determinants of this differential effect need to be investigated.

Controlled delivery of biotechnological products

Peptides, proteins, and nucleotides or DNA fragments are the new generation of drugs. They are becoming attractive owing to the fast development of biotechnology. The admnistration of such molecules, however, may be a problem as sensitivity to temperature, instability at some physiological pH values, short plasma half-life, and high molecular dimension, which hinders the diffusive transport, make, at the moment, parenteral route the only possible way of administration of such molecules. Controlled drug delivery that comprises the development of new administration routes could be the answer to the problems for administration of biotechnological molecules. The rational of drug delivery is to change the pharmacokinetic and pharmacodynamic of drugs by controlling their absorption and distribution. Rate and time of drug release at absorption site could be programmed using a so called delivery system. Different technologies, such as chemical (pro-drugs), biological, polymers, lipids (liposomes, LDL), have been proposed to obtain controlled drug release. Also the use of new administration routes is part of controlled drug delivery. In fact, it could increase the drug absorption and reduce the effects of the active ingredient in those districts not interested in the therapy. Drug delivery systems allowing for an effective release in vivo of new biotechnological molecules, such as recombinant antiidiotypic antibodies with antibiotic activity, devoted to the treatment of pulmonary (tuberculosis and pneumocystosis) and mucosal (candidiasis) diseases are discussed under that perspective.

Postantibiotic leukocyte enhancement of meropenem against gram-positive and gram-negative strains

The postantibiotic leukocyte enhancement (PALE) of meropenem in vitro in comparison with that of imipenem was evaluated with 24 recently isolated gram-positive and gram-negative strains. In general, pre-exposure to carbapenems (at four times the MIC for 2 h) led to increased polymorphonuclear cell phagocytic killing. The PALE of imipenem was generally significantly less than that observed with meropenem.

Therapy of mucosal candidiasis by expression of an anti-idiotype in human commensal bacteria

Two recombinant strains of Streptococcus gordonii, secreting or displaying a microbicidal single-chain antibody (H6), and stably colonizing rat vagina, were used to treat an experimental vaginitis caused by Candida albicans. A post-challenge intravaginal delivery of the H6-secreting strain was as efficacious as fluconazole in rapidly abating the fungal burden. Three weeks after challenge, 75% and 37.5% of the rats treated with the H6-secreting or displaying bacteria, respectively, were cured of the infection, which persisted in 100% of the animals treated with a S. gordonii strain expressing an irrelevant single-chain antibody. Thus, a human commensal bacterium can be suitably engineered to locally release a therapeutic antibody fragment.

[Cardiovascular risk factors in women in menopause]

BACKGROUND

During menopause, women are more exposed to cardiovascular risk factors, some of them can be easily modified by primary and secondary prevention. This paper describes some demographic indicators and cardiovascular risk factors among Italian women.

METHODS

This study describes the Italian women's cardiovascular risk, using the data collected and updated at the end of the 1990s, within the Cardiovascular Epidemiological Observatory, an Italian Collaborative Project of the Istituto Superiore di Sanità and the Italian Association of Cardiologists.

RESULTS

Women aged 60 years and over represent 13% of the population; regional differences on mean values of cardiovascular risk factors are evident. Hypertension, hypercholesterolemia, diabetes and obesity are prevalent particularly in Southern Italy and among the social classes in the lowest education level.

CONCLUSIONS

The data confirm the importance of the main objectives stated by the National Health Plan 1998-2000: promotion of healthier dietary habits, of physical activity, and reduction of smoking habits. This requires specific action to improve women's health condition, to provide for their special needs and to create awareness among women about the importance of preventive action also during the aging process.

Creutzfeldt-Jakob disease mortality in Italy, 1982-1996

We report an estimate of Creutzfeldt-Jakob disease (CJD) deaths in Italy from 1982 to 1996 by using mortality data based on a retrospective review of deaths taken from the mortality data base of the Italian Census Bureau (ISTAT, years 1982-1993), and on the prospective surveillance performed by the Italian National Register of CJD (years 1993-1996). One hundred and ninety-five and 154 deaths attributed to CJD were recorded by ISTAT and the CJD register, respectively. The average annual age-adjusted mortality rate was 0. 45 and 0.84 deaths per million for the period 1982-1993 and 1993-1996, respectively. The yearly increase in the number of CJD deaths was mostly due to a rise in the reported deaths among people older than 60 years. The result of the linkage between ISTAT and the CJD register shows that the integrated age-adjusted mortality rate for 1993 was about 1 case per million, similar to the rates observed in other studies and obtained by the CJD register alone in 1996. This study indicates that the data of the CJD register is accurate and therefore important for assessing eventual changes in the characteristics of the disease resulting from bovine spongiform encephalopathy or other new risk factors.