Search PubMed⌕ Search

Biomedical subjects

N Salomon

Publications and source records attributed to N Salomon.

At least 19 recordsLinked to original sources
PubMed2004

Diverse effects of stress and additional adrenocorticotropic hormone on digitalis-like compounds in normal and nude mice.

Digitalis-like compounds (DLC) are steroidal hormones that are synthesized in, and released from, the adrenal gland, whose regulation may be directed by the hypothalamic-pituitary-adrenal (HPA) axis. Increasing evidence points to antitumour properties of these compounds and we hypothesized that the establishment of tumours in athymic nude mice may be facilitated by an abnormal synthesis or secretion of DLC. To explore this hypothesis, DLC concentrations were determined in the plasma, and in adrenal and hypothalamic tissues of nude compared to normal mice under basal conditions, and 30 min after a stress stimulus (i.p. injection of 100 micro l saline) with or without additional adrenocorticotropic hormone (ACTH) 1 micro g/per animal. Simultaneously, plasma corticosterone and serum adrenocorticotropic hormone (ACTH) concentrations were analysed. The basal DLC concentrations were similar in the plasma and the hypothalamus of both strains, whereas the basal adrenal DLC concentration was significantly lower in the nude mice compared to normal mice. The stress stimulus induced in normal mice a significant increase in DLC concentrations in the adrenal gland, the plasma and the hypothalamus. However, in nude mice, it caused an increase only in the adrenal gland and the hypothalamus, whereas the plasma DLC concentration was not affected. In both strains, the administration of ACTH in addition to injection stress did not provoke a further increase in DLC concentrations while inducing a significant increase in plasma corticosterone concentration. Regardless of the applied stimulus, the nude mice expressed significant lower DLC concentrations in the adrenal gland and the plasma compared to normal mice. The low basal adrenal DLC concentration in nude mice and their impaired DLC response towards stress- and ACTH stimulation both support an involvement of DLC in tumorigenesis.

Adrenal Glands↗
PubMed2001

Cost-effectiveness of tuberculosis screening and observed preventive therapy for active drug injectors at a syringe-exchange program.

This study examined whether costs associated with tuberculosis (TB) screening and directly observed preventive therapy (DOPT) among drug injectors attending a syringe exchange are justified by cases and costs of active TB cases prevented and examined the impact of monetary incentives to promote adherence on cost-effectiveness. We examined program costs and projected savings using observed adherence and prevalence rates and literature estimates of isoniazid (INH) preventive therapy efficacy, expected INH hepatoxicity rates, and TB treatment costs; we conducted sensitivity analyses for a range of INH effectiveness, chest X-ray (CXR) referral adherence, and different strategies regarding anergy among persons affected with human immunodeficiency virus (HIV). For 1,000 patients offered screening, incorporating real observed program adherence rates, the program would avert $179,934 in TB treatment costs, for a net savings of $123,081. Assuming a modest risk of TB among HIV-infected anergic persons, all strategies with regard to anergy were cost saving, and the strategy of not screening for anergy and not providing DOPT to HIV-infected anergic persons resulted in the greatest cost savings. If an incentive of $25 per person increased CXR adherence from the observed 31% to 50% or 100%, over a 5-year follow-up the net cost savings would increase to $170,054 and $414,856, respectively. In this model, TB screening and DOPT at a syringe exchange is a cost-effective intervention and is cost-saving compared to costs of treating active TB cases that would have occurred in the absence of the intervention. This model is useful in evaluating the cost impact of planned program refinements, which can then be tested. Monetary incentives for those referred for screening CXRs would be justified on a cost basis if they had even a modest beneficial impact on adherence.

AIDS-Related Opportunistic Infections↗
PubMed2000

Provision of influenza and pneumococcal vaccines to injection drug users at a syringe exchange.

The objective of this study was to evaluate the feasibility, acceptance, and utility of administering influenza and pneumococcal vaccines to active injection drug users at a syringe exchange program (SEP) in New York City. Influenza and pneumococcal vaccines were offered for 1 month. Data on demographics, health status, vaccine awareness, and prior vaccination status were collected using a staff-administered questionnaire. Of 199 participants interviewed 167 (86%) agreed to one or both vaccinations; 24% of study participants had a chronic condition for which vaccination was indicated and 53% had no regular source of medical care; 95% were aware of influenza vaccine while 25% were aware of pneumococcal vaccine (p <.0001). Of those offered the influenza vaccine, 86% accepted it and 70% of those offered pneumococcal vaccine accepted it (p <.001). Influenza and pneumococcal vaccinations were well-accepted by active drug users at a syringe exchange although there was both greater awareness of and acceptance of influenza. Many SEP participants with chronic medical conditions for which these vaccines are indicated did not have a regular source of health care. Syringe exchange programs may be valuable sites to administer respiratory vaccines and other public health interventions to drug injectors not engaged in medical care in other settings.

Adult↗
PubMed2000

Prevalence and risk factors for positive tuberculin skin tests among active drug users at a syringe exchange program.

OBJECTIVES: To evaluate the prevalence and predictors of tuberculin skin test (TST) reactions > or =10 mm among active injection drug users (IDUs) at a syringe exchange program in New York City. METHODS: From August 1995 to January 1996, participants were offered TB screening, an interview, and received $15.00 upon returning for skin test interpretation. RESULTS: 610/650 (94%) consented to screening. Of the 566 (93%) who returned for skin test readings, skin test data were available for 564 (99.8%); 14% (95% CI 11.6-17.4) had TSTs > or =10 mm. When the > or =5 mm threshold for interpretation of TST among HIV-infected persons was used, the prevalence of TST positivity increased by only 1%. In univariate analysis, the prevalence of TST > or =10 mm increased with age and with increasing years of IDU (both P = 0.001). Because of a strong correlation between age and duration of IDU, two logistic regression models were examined. In the model with age alone, a history of self-reported TST positivity (OR 8.88; 95% CI 4.9-16.09; P = 0.0001) and increasing age (OR per 10 years increase in age, 1.69; 95% CI 1.24-2.29; P = 0.0008) were independent predictors of TSTs > or =10 mm. In the model with duration of IDU, a history of TST positivity (OR 8.82; 95% CI 4.74-16.41; P = 0.0001) and duration of IDU (OR per 10 years of IDU, 1.46; 95% CI 1.10-1.94; P = 0.0081) were independent predictors of TST > or =10 mm. CONCLUSIONS: Use of the reduced cutoff point for TST positivity from 10 mm to 5 mm did not significantly affect the prevalence of positive TSTs in this cohort of active drug users. Increased prevalence of TB infection with age suggests a high annual incidence of TB infection in this population, and the increased risk of TB infection with increasing duration of IDU suggests that the duration spent in IDU environments may increase infection risk.

Adult↗
PubMed1999

[Bath-PUVA therapy of granuloma annulare].

Sixteen patients with generalized granuloma anulare and two patients with localized granuloma anulare received bath-PUVA therapy. Their lesions previously had not responded to conventional therapy. After an average of 55 (11 to 61) treatments and a mean cumulative dose of 69.5 (7.1 to 261.5) J/cm2, complete remission was observed in 5 patients and a clear improvement in 10 patients. Three patients stopped therapy after few treatments. Recurrent lesions appeared in 4 patients; in three of them reinitiation of the bath-PUVA-therapy again led to complete remission. Maintenance therapy for several months may be useful for patients suffering from relapsing granuloma anulare. Potential risks of long-lasting bath-PUVA therapy should be taken into consideration.

Baths↗
PubMed1999

Doing a shotgun: a drug use practice and its relationship to sexual behaviors and infection risk.

There has been a rise in the frequency with which inhalational routes such as smoking are used for illicit drug use. A growing population of new inhalational drug users augments the pool of individuals at risk for transition to injection drug use. Further, illicit drug smoking has been implicated in the transmission of a variety of pathogens by the respiratory route, and crack smoking has been associated with an increased risk of HIV infection, particularly through the exchange of high-risk sex for drugs. Shotguns are an illicit drug smoking practice in which smoked drugs are exhaled or blown by one user into the mouth of another user. We conducted a series of ethnographic observations to attempt to characterize more fully the practice of shotgunning, the range of associated behaviors, and the settings and contexts in which this practice occurs. Shotguns may be seen as a form of drug use which has close ties to sexual behaviors, and which has both pragmatic and interpersonal motivations, combining in a single phenomenon the potential direct and indirect risk of disease transmission by sexual, blood borne and respiratory routes. These data support the need to develop and evaluate comprehensive risk reduction interventions, which take into consideration the relationships between interpersonal and sexual behaviors and specific forms of drug use.

Administration, Inhalation↗
PubMed1999

Knowledge of tuberculosis among drug users. Relationship to return rates for tuberculosis screening at a syringe exchange.

Tuberculosis is an important health issue among drug users. We sought to evaluate active drug users' (DUs) knowledge of tuberculosis (TB) and to assess the relationship between TB knowledge and attitudes and tuberculin skin test (TST) return rates at a syringe exchange program. DUs were recruited at a syringe exchange program in New York City, were interviewed and offered TSTs, and received $15.00 upon returning for TST reading. The questionnaire evaluated knowledge of TB transmission, prevention, and treatment. From March 13, 1995 to January 31, 1996, 610 of 650 (94%) of DUs approached agreed to participate. Of these, 80% had previous TSTs within the past 2 years and 20% were known to be HIV infected. Almost all knew that TB is contagious and more than two thirds knew that TB is treatable and that TB preventive therapy existed. However, fewer than half knew that HIV-related TB could be treated, 30% thought TB could be treated without a medical doctor, and the majority (70%) thought a reactive TST implied infectivity. The rate of return for TST reading was 93%. In multivariate analysis, those who knew that HIV-related TB was curable were more likely to return for TST reading (odds ratio 2.0; 95% confidence interval 1.04 to 3.95; p = .03). The high acceptance and return rates suggest that TB services can be incorporated into syringe exchange programs. However, several important gaps in TB knowledge existed in this population at high risk of TB, which may impact on adherence and which support the need for TB education for drug users.

Adult↗
PubMed1999

Tuberculosis in patients with human immunodeficiency virus infection.

Tuberculosis (TB) is the major opportunistic infection of human immunodeficiency virus (HIV)-infected persons worldwide. Human immunodeficiency virus infection is the most potent known risk factor for reactivation of latent Mycobacterium tuberculosis infection, and TB disease appears to increase the rate of HIV progression. Pulmonary disease is seen in most patients, including a large proportion of those with extrapulmonary disease. Failure to suspect TB and to order the appropriate diagnostic tests is the most common reason for diagnostic delays. With advancing HIV infection, tuberculin skin test reactivity decreases along with reactivity to nonspecific antigens such as mumps, tetanus toxoid, and Candida; anergy testing need not be a routine component of tuberculosis screening of HIV-infected persons. The diagnosis depends on identifying the organism on smears or cultures; direct amplification tests may facilitate rapid identification of M. tuberculosis, but the relatively low sensitivity in smear-negative specimens limits their use. Also, these tests must be used in conjunction with the clinical assessment, and they must always be performed in conjunction with microscopy and standard culture. Shorter courses of combination preventive therapy of patients with latent tuberculous infection are effective, but the potential advantages of improved adherence and reduced costs of shorter courses should be balanced with an increased risk secondary to ongoing TB exposure in areas with a high TB prevalence. Six months of treatment for active tuberculosis is recommended, unless the response of a particular patient is slow or otherwise suboptimal. The use of highly active antiretroviral therapy (HAART) made a remarkable impact on the course or HIV disease, but raises several issues with respect to HIV-related TB. Drug interactions necessitate either a non-rifamycin-based regimen or a rifabutin-based regimen in patients on HAART treated for TB.

AIDS-Related Opportunistic Infections↗
PubMed1999

Cytomegalovirus pneumonia.

Cytomegalovirus (CMV) pneumonia is a major cause of morbidity and mortality in allogeneic bone marrow transplant and lung transplant recipients. However, its role as a cause of lung disease in patients with the human immunodeficiency virus (HIV) is controversial. Although CMV can be isolated from lung specimens in patients with HIV-associated respiratory illness, it is rarely the causative pathogen. Most adults with HIV infection have latent CMV infection of many tissues including the lung, and most cases of CMV pneumonia are believed to be caused by reactivation secondary to severe immunocompromise. The clinical presentation of pneumonia caused by CMV pneumonia is similar to that of Pneumocystis carinii, with fever, cough, hypoxemia, and diffuse radiographic opacities. Although the two infections can not be differentiated on clinical grounds alone, the presence of extrapulmonary CMV disease and the use of recent cytotoxic chemotherapy or corticosteroids suggests the diagnosis of CMV pneumonia. Although approximately 60% of cases respond initially to anti-CMV therapy, the disease is associated with progression and high early mortality, probably related to severe underlying immunosuppression.

AIDS-Related Opportunistic Infections↗
PubMed1998

Evaluation of an intensive intermittent-induction regimen and duration of short-course treatment for human immunodeficiency virus-related pulmonary tuberculosis. Terry Beirn Community Programs for Clinical Research on AIDS (CPCRA) and the AIDS Clinical Trials Group (ACTG).

This study examined whether adding levofloxacin to a standard four-drug regimen improved the 8-week culture response and compared effectiveness of 9 versus 6 months of intermittent therapy for human immunodeficiency virus-related pansusceptible pulmonary tuberculosis. Patients were randomized to receive either four or five drugs, the fifth being levofloxacin. Patients who completed induction therapy were randomized to complete 9 versus 6 months of intermittent therapy with isoniazid and rifampin. In the randomized induction phase, 97.3% of patients in the four-drug group and 95.8% in the five-drug group had sputum culture conversion at 8 weeks (P = 1.00). In the continuation phase, one patient (2%) assigned to 9 months and two patients (3.9%) assigned to 6 months of therapy had treatment failure/relapse (P = 1.00). In conclusion, this study showed that levofloxacin added no benefit to a highly effective, largely intermittent, four-drug induction regimen. Both 9 and 6 months of intermittent therapy were associated with low treatment failure/relapse rates.

AIDS-Related Opportunistic Infections↗
PubMed1997

Widespread dissemination of a drug-susceptible strain of Mycobacterium tuberculosis.

In New York City, a large proportion of new tuberculosis cases has been caused by 1 drug-susceptible strain (called C strain) of Mycobacterium tuberculosis. Between 1991 and 1994, among >600 tuberculosis patients consecutively identified in four large hospitals in the city, 54 with C strain, 69 with non-C cluster pattern strains, and 42 with noncluster pattern strains were studied. Susceptibility to reactive nitrogen intermediates (RNI) of selected isolates was compared. In a case-control analysis, 51% of patients with C strain, 28% with non-C cluster strains (P < .05), and 14% with noncluster strains (P < .01) were found to be injection drug users. C strain but not 13 other unrelated isolates were resistant to RNI. Injection drug use may provide a selective pressure for an RNI-resistant tubercle bacillus to emerge, which may give the organism a biologic advantage and explain the widespread dissemination of C strain M. tuberculosis within the city.

Adolescent↗
PubMed1997

Variation of chest radiographic patterns in pulmonary tuberculosis by degree of human immunodeficiency virus-related immunosuppression. The Terry Beirn Community Programs for Clinical Research on AIDS (CPCRA). The AIDS Clinical Trials Group (ACTG).

Our aim was to evaluate the effect of human immunodeficiency virus (HIV) disease stage on chest radiographic (CXR) findings among patients with HIV-related pulmonary tuberculosis (TB). Data are from a prospective multicenter treatment trial for HIV-related TB. Baseline CXR findings and CD4+ lymphocyte counts were compared among patients with HIV-related TB. Data from published studies describing CXR findings in HIV-infected patients were reviewed and a pooled-data analysis was conducted. Of 135 patients with culture-confirmed HIV-related TB, 128 had both CXR and CD4+ lymphocyte data. CD4+ lymphocyte counts of < 200/mm3 (n = 98) were significantly associated with hilar/mediastinal adenopathy on CXR (30%, vs. 7% with counts > or = 200/mm3; P = .01); counts of > or = 200/mm3 (n = 30) more frequently were associated with cavitation (20% vs. 7%; P = .08). Analyses of these results, pooled with other published data, confirmed these findings. This study demonstrates associations of certain CXR findings with HIV disease stage. Knowledge of the degree of immunosuppression is important when evaluating CXR findings in HIV-infected patients.

AIDS-Related Opportunistic Infections↗
PubMed1997

Clinical features and outcomes of HIV-related cytomegalovirus pneumonia.

OBJECTIVE: To describe the characteristics and outcomes of HIV-infected patients with biopsy-proven cytomegalovirus (CMV) pneumonia. DESIGN: Retrospective study. SETTING: A 900-bed acute facility in New York City. PATIENTS: Eighteen HIV-infected patients with pathologically confirmed CMV inclusions in lung tissue without other pathogens and 36 control patients with biopsy-proven Pneumocystis carinii pneumonia (PCP) selected for comparisons by computer-generated random sequential numbers. MAIN OUTCOME MEASURES: Demographic, clinical, laboratory, radiological findings, and in-hospital mortality. RESULTS: Eighteen HIV-infected patients were found to have CMV lung infection alone. Pathologic findings were pneumonitis (n = 11); pneumonitis and pulmonary vasculitis (n = 1); and CMV inclusions alone (n = 6). All presented with respiratory symptoms (cough or dyspnea), 89% had fever, 83% had radiological abnormalities, and 56% had severe hypoxemia. The pulmonary presentation was similar except for higher lactate dehydrogenase (median, 449 versus 329 IU/l; P = 0.03) and presence of pleural effusions (33 versus 0%; P = 0.001) in CMV patients. Multivariate analysis showed that CD4 counts < or = 12 x 10(6)/l (odds ratio; 9.2; P = 0.029) and extrapulmonary CMV (odds ratio, 20.4; P = 0.039) were independently associated with CMV pneumonia. Seventeen patients received specific anti-CMV therapy for a mean of 22 +/- 13 days. In-hospital mortality was higher in patients with CMV pneumonia (odds ratio, 11.9; P = 0.002). The median time from admission to death was 31 days. CONCLUSIONS: CMV lung infection was seen in severely immunosuppressed HIV-positive patients and associated with clinical pneumonitis with high early mortality. Although the clinical features resemble PCP, the presence of extrapulmonary CMV disease should suggest the diagnosis of CMV pneumonia.

AIDS-Related Opportunistic Infections↗
PubMed1997

Susceptibility to levofloxacin of Myocobacterium tuberculosis isolates from patients with HIV-related tuberculosis and characterization of a strain with levofloxacin monoresistance. Community Programs for Clinical Research on AIDS 019 and the AIDS Clinical Trials Group 222 Protocol Team.

OBJECTIVE: To characterize the susceptibility to levofloxacin of clinical isolates of Mycobacterium tuberculosis (MTB) obtained from patients with HIV-related tuberculosis and to characterize the molecular genetics of levofloxacin resistance. DESIGN AND METHODS: Isolates from culture-positive patients in a United States multicenter trial of HIV-related TB were tested for susceptibility to levofloxacin by minimum inhibitory concentration (MIC) determinations in Bactec 7H12 broth. Automated sequencing of the resistance determining region of gyrA was performed. RESULTS: Of the 135 baseline MTB isolates tested, 134 (99%; 95% exact binomial confidence interval, 95.9-99.9%) were susceptible to levofloxacin with an MIC < or = 1.0 microg/ml. We identified a previously unrecognized mis-sense mutation occurring at codon 88 of gyrA in a levofloxacin mono-resistant MTB isolate obtained from a patient with AIDS who had received ofloxacin for 8 months prior to the diagnosis of tuberculosis. CONCLUSIONS: Clinical MTB isolates from HIV-infected patients were generally susceptible to levofloxacin. However, the identification of a clinical isolate with mono-resistance to levofloxacin highlights the need for circumspection in the use of fluoroquinolones in the setting of potential HIV-related tuberculosis and for monitoring of rates of resistance of MTB isolates to fluoroquinolones.

AIDS-Related Opportunistic Infections↗