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Frediani JK, Jones DP, Tukvadze N, Uppal K, Sanikidze E, Kipiani M, Tran VT, Hebbar G, Walker DI, Kempker RR, Kurani SS, Colas RA, Dalli J, Tangpricha V, Serhan CN, Blumberg HM, Ziegler TR. Plasma metabolomics in human pulmonary tuberculosis disease: a pilot study. PLoS One 2014; 9:e108854. [PMID: 25329995 PMCID: PMC4198093 DOI: 10.1371/journal.pone.0108854] [Citation(s) in RCA: 112] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2014] [Accepted: 08/26/2014] [Indexed: 12/31/2022] Open
Abstract
We aimed to characterize metabolites during tuberculosis (TB) disease and identify new pathophysiologic pathways involved in infection as well as biomarkers of TB onset, progression and resolution. Such data may inform development of new anti-tuberculosis drugs. Plasma samples from adults with newly diagnosed pulmonary TB disease and their matched, asymptomatic, sputum culture-negative household contacts were analyzed using liquid chromatography high-resolution mass spectrometry (LC-MS) to identify metabolites. Statistical and bioinformatics methods were used to select accurate mass/charge (m/z) ions that were significantly different between the two groups at a false discovery rate (FDR) of q<0.05. Two-way hierarchical cluster analysis (HCA) was used to identify clusters of ions contributing to separation of cases and controls, and metabolomics databases were used to match these ions to known metabolites. Identity of specific D-series resolvins, glutamate and Mycobacterium tuberculosis (Mtb)-derived trehalose-6-mycolate was confirmed using LC-MS/MS analysis. Over 23,000 metabolites were detected in untargeted metabolomic analysis and 61 metabolites were significantly different between the two groups. HCA revealed 8 metabolite clusters containing metabolites largely upregulated in patients with TB disease, including anti-TB drugs, glutamate, choline derivatives, Mycobacterium tuberculosis-derived cell wall glycolipids (trehalose-6-mycolate and phosphatidylinositol) and pro-resolving lipid mediators of inflammation, known to stimulate resolution, efferocytosis and microbial killing. The resolvins were confirmed to be RvD1, aspirin-triggered RvD1, and RvD2. This study shows that high-resolution metabolomic analysis can differentiate patients with active TB disease from their asymptomatic household contacts. Specific metabolites upregulated in the plasma of patients with active TB disease, including Mtb-derived glycolipids and resolvins, have potential as biomarkers and may reveal pathways involved in TB disease pathogenesis and resolution.
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Tukvadze N, Bablishvili N, Apsindzelashvili R, Blumberg HM, Kempker RR. Performance of the MTBDRsl assay in Georgia. Int J Tuberc Lung Dis 2014; 18:233-9. [PMID: 24429319 DOI: 10.5588/ijtld.13.0468] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
SETTING The country of Georgia has a high burden of multi- (MDR-TB) and extensively drug-resistant tuberculosis (XDR-TB). OBJECTIVE To assess the performance of the GenoType® MTBDRsl assay in the detection of resistance to kanamycin (KM), capreomycin (CPM) and ofloxacin (OFX), and of XDR-TB. DESIGN Consecutive acid-fast bacilli smear-positive sputum specimens identified as MDR-TB using the MTBDRplus test were evaluated with the MTBDRsl assay and conventional second-line drug susceptibility testing (DST). RESULTS Among 159 specimens, amplification was adequate in 154 (97%), including 9 of 9 culture-negative and 2 of 3 contaminated specimens. Second-line DST revealed that 17 (12%) Mycobacterium tuberculosis isolates were XDR-TB. Compared to DST, the MTBDRsl had 41% sensitivity and 98% specificity in detecting XDR-TB and 81% sensitivity and 99% specificity in detecting OFX resistance. Sensitivity was low in detecting resistance to KM (29%) and CPM (57%), while specificity was respectively 99% and 94%. Median times from sputum collection to second-line DST and MTBDRsl results were 70-104 vs. 10 days. CONCLUSION Although the MTBDRsl assay had a rapid turnaround time, detection of second-line drug resistance was poor compared to DST. Further genetic mutations associated with resistance to second-line drugs should be included in the assay to improve test performance and clinical utility.
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Kipiani M, Mirtskhulava V, Tukvadze N, Magee M, Blumberg HM, Kempker RR. Significant clinical impact of a rapid molecular diagnostic test (Genotype MTBDRplus assay) to detect multidrug-resistant tuberculosis. Clin Infect Dis 2014; 59:1559-66. [PMID: 25091301 DOI: 10.1093/cid/ciu631] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND There are limited data on the clinical impact of rapid diagnostic tests to detect multidrug-resistant tuberculosis (MDR-TB). We sought to determine whether the use of a molecular diagnostic test to detect MDR-TB improves clinical outcomes. METHODS A quasi-experimental study was conducted to analyze the impact of the Genotype MTBDRplus assay on clinical outcomes among patients with culture-confirmed pulmonary MDR-TB. Patients received treatment at the National Center for Tuberculosis and Lung Diseases in Tbilisi, Georgia. Time to MDR-TB treatment initiation, culture conversion, and infection control measures were compared to a time period prior to the implementation of the molecular test. RESULTS Of 152 MDR-TB patients, 72 (47%) were from prior to and 80 (53%) following implementation of the MTBDRplus assay ("post-implementation group"). Patients in the post-implementation group initiated a second-line treatment regimen more rapidly than those in the pre-implementation group (18.2 vs 83.9 days, P < .01). Among patients admitted to a "drug-susceptible" tuberculosis ward, those from the post-implementation group spent significantly fewer days on the drug-susceptible ward compared to patients in the pre-implementation group (10.0 vs 58.3 days, P < .01). Among patients with 24 weeks follow-up (n = 119), those in the post-implementation group had a higher rate of culture conversion at 24 weeks (86% vs 63%, P < .01) and a more rapid rate of time to culture conversion (adjusted hazard ratio [aHR] 4.15, 95% confidence interval [CI], 2.5-6.9). CONCLUSIONS The implementation of a rapid molecular diagnostic test led to significant clinical improvements including reduced time to initiation of MDR-TB treatment, culture conversion, and improved infection control practices.
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Adelman MW, Kurbatova E, Wang YF, Leonard MK, White N, McFarland DA, Blumberg HM. Cost analysis of a nucleic acid amplification test in the diagnosis of pulmonary tuberculosis at an urban hospital with a high prevalence of TB/HIV. PLoS One 2014; 9:e100649. [PMID: 25014783 PMCID: PMC4094433 DOI: 10.1371/journal.pone.0100649] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2012] [Accepted: 05/30/2014] [Indexed: 11/18/2022] Open
Abstract
INTRODUCTION The Centers for Disease Control and Prevention has recommended using a nucleic acid amplification test (NAAT) for diagnosing pulmonary tuberculosis (TB) but there is a lack of data on NAAT cost-effectiveness. METHODS We conducted a prospective cohort study that included all patients with an AFB smear-positive respiratory specimen at Grady Memorial Hospital in Atlanta, GA, USA between January 2002 and June 2008. We determined the sensitivity, specificity, and positive and negative predictive value of a commercially available and FDA-approved NAAT (amplified MTD, Gen-Probe) compared to the gold standard of culture. A cost analysis was performed and included costs related to laboratory tests, hospital charges, anti-TB medications, and contact investigations. Average cost per patient was calculated under two conditions: (1) using a NAAT on all AFB smear-postive respiratory specimens and (2) not using a NAAT. One-way sensitivity analyses were conducted to determine sensitivity of cost difference to reasonable ranges of model inputs. RESULTS During a 6 1/2 year study period, there were 1,009 patients with an AFB smear-positive respiratory specimen at our public urban hospital. We found the NAAT to be highly sensitive (99.6%) and specific (99.1%) on AFB smear-positive specimens compared to culture. Overall, the positive predictive value (PPV) of an AFB smear-positive respiratory specimen for culture-confirmed TB was 27%. The PPV of an AFB smear-positive respiratory specimen for culture-confirmed TB was significantly higher for HIV-uninfected persons compared to those who were HIV-seropositive (152/271 [56%] vs. 85/445 [19%]; RR = 2.94, 95% CI 2.36-3.65, p<0.001). The cost savings of using the NAAT was $2,003 per AFB smear-positive case. CONCLUSIONS Routine use of the NAAT on AFB smear-positive respiratory specimens was highly cost-saving in our setting at a U.S. urban public hospital with a high prevalence of TB and HIV because of the low PPV of an AFB smear for culture-confirmed TB.
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Alemayehu M, Gelaw B, Abate E, Wassie L, Belyhun Y, Bekele S, Kempker RR, Blumberg HM, Aseffa A. Active tuberculosis case finding and detection of drug resistance among HIV-infected patients: A cross-sectional study in a TB endemic area, Gondar, Northwest Ethiopia. Int J Mycobacteriol 2014; 3:132-8. [PMID: 26786335 PMCID: PMC5030108 DOI: 10.1016/j.ijmyco.2014.02.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2014] [Revised: 02/07/2014] [Accepted: 02/09/2014] [Indexed: 11/27/2022] Open
Abstract
BACKGROUND Tuberculosis (TB) patients co-infected with human immunodeficiency virus (HIV) often lack the classic symptoms of pulmonary tuberculosis, making the diagnosis difficult. Current practices in resource-limited settings often indicate that these co-infected patients are diagnosed when they clinically manifest disease symptoms, resulting in a delayed diagnosis and despite continued transmission. The aim of this study is to determine the prevalence of undiagnosed pulmonary tuberculosis cases through active case finding and including multidrug-resistant TB (MDR-TB) among HIV-infected patients. MATERIALS AND METHODS A total of 250 HIV-infected patients, aged 18years and above were evaluated in a cross-sectional design between February 2012 and November 2012. Socio-demographic and clinical data were collected using a structured questionnaire. Sputum samples were collected from all participants for acid fast bacilli (AFB) direct smear microscopy and Mycobacteria culture. A PCR-based RD9 deletion and genus typing, as well as first-line anti-TB drug susceptibility testing, was performed for all culture-positive isolates. RESULTS Following active TB case finding, a total of 15/250 (6%) cases were diagnosed as TB cases, of whom 9/250 (3.6%) were detected by both smear microscopy and culture and the remaining 6/250 (2.4%) only by culture. All the 15 isolates were typed through RD9 typing of which 10 were Mycobacterium tuberculosis species; 1 belonged to Mycobacterium genus and 4 isolates were non-tuberculous mycobacteria. The prevalence of undiagnosed pulmonary TB disease among the study participants was 4.4%, which implies the possibility of identifying even more undiagnosed cases through active case finding. A multivariate logistic regression showed a statistically significant association between the presence of pneumonia infection and the occurrence of TB (OR=4.81, 95% CI (1.08-21.43), p=0.04). In addition, all the isolates were sensitive to all first-line anti-TB drugs, except for streptomycin, seen in only one newly diagnosed TB patient, and MDR-TB was not detected. CONCLUSION The prevalence of undiagnosed pulmonary TB infection among HIV-infected patients in Gondar was 4.4%. Additionally, the possibility of these undiagnosed TB cases in the community could also pose a risk for the transmission of the disease, particularly among family members. Active screening of known HIV-infected individuals, with at least one TB symptom is recommended, even in persons with opportunistic infections.
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Zaeh S, Kempker R, Stenehjem E, Blumberg HM, Temesgen O, Ofotokun I, Tenna A. Improving tuberculosis screening and isoniazid preventive therapy in an HIV clinic in Addis Ababa, Ethiopia. Int J Tuberc Lung Dis 2014; 17:1396-401. [PMID: 24125440 DOI: 10.5588/ijtld.13.0315] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The World Health Organization (WHO) recommends active tuberculosis (TB) case finding among people living with human immunodeficiency virus (HIV) in resource-limited settings using a symptom-based algorithm; those without active TB disease should be offered isoniazid preventive therapy (IPT). OBJECTIVE To evaluate rates of adherence to WHO recommendations and the impact of a quality improvement intervention in an HIV clinic in Addis Ababa, Ethiopia. DESIGN A prospective study design was utilized to compare TB symptom screening and IPT administration rates before and after a quality improvement intervention consisting of 1) educational sessions, 2) visual reminders, and 3) use of a screening checklist. RESULTS A total of 751 HIV-infected patient visits were evaluated. The proportion of patients screened for TB symptoms increased from 22% at baseline to 94% following the intervention (P < 0.001). Screening rates improved from 51% to 81% (P < 0.001) for physicians and from 3% to 100% (P < 0.001) for nurses. Of the 281 patients with negative TB symptom screens and eligible for IPT, 4% were prescribed IPT before the intervention compared to 81% after (P < 0.001). CONCLUSIONS We found that a quality improvement intervention significantly increased WHO-recommended TB screening rates and IPT administration. Utilizing nurses can help increase TB screening and IPT provision in resource-limited settings.
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Schmitz K, Kempker RR, Tenna A, Stenehjem E, Abebe E, Tadesse L, Jirru EK, Blumberg HM. Effectiveness of a multimodal hand hygiene campaign and obstacles to success in Addis Ababa, Ethiopia. Antimicrob Resist Infect Control 2014; 3:8. [PMID: 24636693 PMCID: PMC4004416 DOI: 10.1186/2047-2994-3-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2013] [Accepted: 03/06/2014] [Indexed: 12/18/2022] Open
Abstract
Background Hand hygiene is the cornerstone of infection control and reduces rates of healthcare associated infection. There are limited data evaluating hand hygiene adherence and hand hygiene campaign effect in resource-limited settings, especially in Sub-Saharan Africa. This study assessed the impact of implementing a World Health Organization (WHO)-recommended multimodal hand hygiene campaign at a hospital in Ethiopia. Methods This study included a before-and-after assessment of health care worker (HCW) adherence with WHO hand hygiene guidelines. It was implemented in three phases: 1) baseline evaluation of hand hygiene adherence and hospital infrastructure; 2) intervention (distribution of commercial hand sanitizer and implementation of an abbreviated WHO-recommended multimodal hand hygiene campaign); and 3) post-intervention evaluation of HCW hand hygiene adherence. HCWs’ perceptions of the campaign and hand sanitizer tolerability were assessed through a survey performed in the post-intervention period. Results At baseline, hand washing materials were infrequently available, with only 20% of sinks having hand-washing materials. There was a significant increase in hand hygiene adherence among HCWs following implementation of a WHO multimodal hand hygiene program. Adherence increased from 2.1% at baseline (21 hand hygiene actions/1000 opportunities for hand hygiene) to 12.7% (127 hand hygiene actions /1000 opportunities for hand hygiene) after the implementation of the hand hygiene campaign (OR = 6.8, 95% CI 4.2-10.9). Hand hygiene rates significantly increased among all HCW types except attending physicians. Independent predictors of HCW hand hygiene compliance included performing hand hygiene in the post-intervention period (aOR = 5.7, 95% CI 3.5-9.3), in the emergency department (aOR = 4.9, 95% CI 2.8-8.6), during patient care that did not involve Attending Physician Rounds (aOR = 2.4, 95% CI 1.2-4.5), and after patient contact (aOR = 2.1, 95% CI 1.4-3.3). In the perceptions survey, 64.0% of HCWs indicated preference for commercially manufactured hand sanitizer and 71.4% indicated their hand hygiene adherence would improve with commercial hand sanitizer. Conclusions There was a significant increase in hand hygiene adherence among Ethiopian HCWs following the implementation of a WHO-recommended multimodal hand hygiene campaign. Dissatisfaction with the current WHO-formulation for hand sanitizer was identified as a barrier to hand hygiene adherence in our setting.
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Magee MJ, Foote M, Maggio DM, Howards PP, Narayan KMV, Blumberg HM, Ray SM, Kempker RR. Diabetes mellitus and risk of all-cause mortality among patients with tuberculosis in the state of Georgia, 2009-2012. Ann Epidemiol 2014; 24:369-75. [PMID: 24613196 DOI: 10.1016/j.annepidem.2014.01.012] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2013] [Revised: 01/14/2014] [Accepted: 01/28/2014] [Indexed: 10/25/2022]
Abstract
PURPOSE To estimate the association between diabetes mellitus (DM) and all-cause mortality during tuberculosis (TB) treatment. METHODS From 2009 to 2012, a retrospective cohort study among reported TB cases in Georgia was conducted. Patients aged 16 years or older were classified by DM and human immunodeficiency virus (HIV) status at the time of TB diagnosis and followed during TB treatment to assess mortality. Hazard ratios were used to estimate the association between DM and death. RESULTS Among 1325 patients with TB disease, 151 (11.4%) had DM, 147 (11.1%) were HIV-infected, and seven (0.5%) had both DM and HIV. Patients with TB-DM were more likely to have cavitary lung disease compared with those with TB alone (51.0% vs. 34.7%) and those with TB-HIV were more likely to have military/disseminated disease (12.9% vs. 3.4%) and resistance to rifampin or isoniazid (21.8% vs. 9.0%) compared with those without HIV infection (P < .05). In multivariable analysis, DM was not associated with death during TB treatment (hazard ratio, 1.22; 95% confidence interval, 0.70-2.12) or any death (adjusted odds ratio, 1.05; 95% confidence interval, 0.60-1.84). CONCLUSIONS Among TB patients in Georgia, the prevalence of comorbid DM and coinfection with HIV was nearly identical. In adjusted models, TB patients with DM did not have increased risk of all-cause mortality.
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Smitson CC, Tenna A, Tsegaye M, Alemu AS, Fekade D, Aseffa A, Blumberg HM, Kempker RR. No association of cryptococcal antigenemia with poor outcomes among antiretroviral therapy-experienced HIV-infected patients in Addis Ababa, Ethiopia. PLoS One 2014; 9:e85698. [PMID: 24465651 PMCID: PMC3897463 DOI: 10.1371/journal.pone.0085698] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2013] [Accepted: 12/03/2013] [Indexed: 12/03/2022] Open
Abstract
Introduction There are limited data on clinical outcomes of ART-experienced patients with cryptococcal antigenemia. We assessed clinical outcomes of a predominantly asymptomatic, ART-experienced cohort of HIV+ patients previously found to have a high (8.4%) prevalence of cryptococcal antigenemia. Methods The study took place at All Africa Leprosy, Tuberculosis and Rehabilitative Training Centre and Black Lion Hospital HIV Clinics in Addis Ababa, Ethiopia. A retrospective study design was used to perform 12-month follow-up of 367 mostly asymptomatic HIV-infected patients (CD4<200 cells/µl) with high levels of antiretroviral therapy use (74%) who were previously screened for cryptococcal antigenemia. Medical chart abstraction was performed approximately one year after initial screening to obtain data on clinic visit history, ART use, CD4 count, opportunistic infections, and patient outcome. We evaluated the association of cryptococcal antigenemia and a composite poor outcome of death and loss to follow-up using logistic regression. Results Overall, 323 (88%) patients were alive, 8 (2%) dead, and 36 (10%) lost to follow-up. Among the 31 patients with a positive cryptococcal antigen test (titers ≥1∶8) at baseline, 28 were alive (all titers ≤1∶512), 1 dead and 2 lost to follow-up (titers ≥1∶1024). In multivariate analysis, cryptococcal antigenemia was not predictive of a poor outcome (aOR = 1.3, 95% CI 0.3–4.8). A baseline CD4 count <100 cells/µl was associated with an increased risk of a poor outcome (aOR 3.0, 95% CI 1.4–6.7) while an increasing CD4 count (aOR 0.1, 95% CI 0.1–0.3) and receiving antiretroviral therapy at last follow-up visit (aOR 0.1, 95% CI 0.02–0.2) were associated with a reduced risk of a poor outcome. Conclusions Unlike prior ART-naïve cohorts, we found that among persons receiving ART and with CD4 counts <200 cells/µl, asymptomatic cryptococcal antigenemia was not predictive of a poor outcome.
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Lomtadze N, Kupreishvili L, Salakaia A, Vashakidze S, Sharvadze L, Kempker RR, Magee MJ, del Rio C, Blumberg HM. Hepatitis C virus co-infection increases the risk of anti-tuberculosis drug-induced hepatotoxicity among patients with pulmonary tuberculosis. PLoS One 2013; 8:e83892. [PMID: 24367617 PMCID: PMC3868578 DOI: 10.1371/journal.pone.0083892] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2012] [Accepted: 11/15/2013] [Indexed: 12/09/2022] Open
Abstract
BACKGROUND The country of Georgia has a high prevalence of tuberculosis (TB) and hepatitis C virus (HCV) infection. PURPOSE To determine whether HCV co-infection increases the risk of incident drug-induced hepatitis among patients on first-line anti-TB drug therapy. METHODS Prospective cohort study; HCV serology was obtained on all study subjects at the time of TB diagnosis; hepatic enzyme tests (serum alanine aminotransferase [ALT] activity) were obtained at baseline and monthly during treatment. RESULTS Among 326 study patients with culture-confirmed TB, 68 (21%) were HCV co-infected, 14 (4.3%) had chronic hepatitis B virus (HBV) infection (hepatitis B virus surface antigen positive [HBsAg+]), and 6 (1.8%) were HIV co-infected. Overall, 19% of TB patients developed mild to moderate incident hepatotoxicity. In multi-variable analysis, HCV co-infection (adjusted Hazards Ratio [aHR]=3.2, 95% CI=1.6-6.5) was found to be an independent risk factor for incident anti-TB drug-induced hepatotoxicity. Survival analysis showed that HCV co-infected patients developed hepatitis more quickly compared to HCV seronegative patients with TB. CONCLUSION A high prevalence of HCV co-infection was found among patients with TB in Georgia. Drug-induced hepatotoxicity was significantly associated with HCV co-infection but severe drug-induced hepatotoxicity (WHO grade III or IV) was rare.
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Frediani JK, Tukvadze N, Sanikidze E, Kipiani M, Hebbar G, Easley KA, Shenvi N, Ramakrishnan U, Tangpricha V, Blumberg HM, Ziegler TR. A culture-specific nutrient intake assessment instrument in patients with pulmonary tuberculosis. Clin Nutr 2013; 32:1023-8. [PMID: 23541173 PMCID: PMC3706571 DOI: 10.1016/j.clnu.2013.02.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2013] [Accepted: 02/25/2013] [Indexed: 11/26/2022]
Abstract
BACKGROUND & AIM To develop and evaluate a culture-specific nutrient intake assessment tool for use in adults with pulmonary tuberculosis (TB) in Tbilisi, Georgia. METHODS We developed an instrument to measure food intake over 3 consecutive days using a questionnaire format. The tool was then compared to 24 h food recalls. Food intake data from 31 subjects with TB were analyzed using the Nutrient Database System for Research (NDS-R) dietary analysis program. Paired t-tests, Pearson correlations and intraclass correlation coefficients (ICC) were used to assess the agreement between the two methods of dietary intake for calculated nutrient intakes. RESULTS The Pearson correlation coefficient for mean daily caloric intake between the 2 methods was 0.37 (P = 0.04) with a mean difference of 171 kcals/day (p = 0.34). The ICC was 0.38 (95% CI: 0.03-0.64) suggesting the within-patient variability may be larger than between-patient variability. Results for mean daily intake of total fat, total carbohydrate, total protein, retinol, vitamins D and E, thiamine, calcium, sodium, iron, selenium, copper, and zinc between the two assessment methods were also similar. CONCLUSIONS This novel nutrient intake assessment tool provided quantitative nutrient intake data from TB patients. These pilot data can inform larger studies in similar populations.
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Tenna A, Stenehjem EA, Margoles L, Kacha E, Blumberg HM, Kempker RR. Infection control knowledge, attitudes, and practices among healthcare workers in Addis Ababa, Ethiopia. Infect Control Hosp Epidemiol 2013; 34:1289-96. [PMID: 24225614 PMCID: PMC3995333 DOI: 10.1086/673979] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
OBJECTIVE To better understand hospital infection control practices in Ethiopia. DESIGN A cross-sectional evaluation of healthcare worker (HCW) knowledge, attitudes, and practices about hand hygiene and tuberculosis (TB) infection control measures. METHODS An anonymous 76-item questionnaire was administered to HCWs at 2 university hospitals in Addis Ababa, Ethiopia. Knowledge items were scored as correct/incorrect. Attitude and practice items were assessed using a Likert scale. RESULTS In total, 261 surveys were completed by physicians (51%) and nurses (49%). Fifty-one percent of respondents were male; mean age was 30 years. While hand hygiene knowledge was fair, self-reported practice was suboptimal. Physicians reported performing hand hygiene 7% and 48% before and after patient contact, respectively. Barriers for performing hand hygiene included lack of hand hygiene agents (77%), sinks (30%), and proper training (50%) as well as irritation and dryness (67%) caused by hand sanitizer made in accordance with the World Health Organization formulation. TB infection control knowledge was excellent (more than 90% correct). Most HCWs felt that they were at high risk for occupational acquisition of TB (71%) and that proper TB infection control can prevent nosocomial transmission (92%). Only 12% of HCWs regularly wore a mask when caring for TB patients. Only 8% of HCWs reported that masks were regularly available, and 76% cited a lack of infrastructure to isolate suspected/known TB patients. CONCLUSIONS Training HCWs about the importance and proper practice of hand hygiene along with improving hand sanitizer options may improve patient safety. Additionally, enhanced infrastructure is needed to improve TB infection control practices and allay HCW concerns about acquiring TB in the hospital.
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Chkhartishvili N, Kempker RR, Dvali N, Abashidze L, Sharavdze L, Gabunia P, Blumberg HM, del Rio C, Tsertsvadze T. Poor agreement between interferon-gamma release assays and the tuberculin skin test among HIV-infected individuals in the country of Georgia. BMC Infect Dis 2013; 13:513. [PMID: 24176032 PMCID: PMC3817813 DOI: 10.1186/1471-2334-13-513] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2013] [Accepted: 10/30/2013] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND Improved tests to diagnose latent TB infection (LTBI) are needed. We sought to evaluate the performance of two commercially available interferon-gamma release assays (IGRAs) compared to the tuberculin skin test (TST) for the diagnosis of LTBI and to identify risk factors for LTBI among HIV-infected individuals in Georgia, a country with high rates of TB. METHODS HIV-patients were enrolled from the National AIDS Center in Tbilisi, Georgia. After providing informed consent, each participant completed a questionnaire, had blood drawn for QuantiFERON-TB Gold in-Tube (QFT-GIT) and T-SPOT.TB testing and had a TST placed. The TST was read at 48-72 hrs with ≥ 5 mm induration considered positive. RESULTS Between 2009-2011, 240 HIV-infected persons (66% male) with a median age of 38 years and a median CD4 count of 255 cells/μl (IQR: 124-412) had diagnostic testing for LTBI performed. 94% had visible evidence of a BCG scar. The TST was positive in 41 (17%) patients; QFT-GIT in 70 (29%); and T-SPOT.TB in 56 (24%). At least one diagnostic test was positive in 109 (45%) patients and only among 13 (5%) patients were all three tests positive. Three (1%) QFT-GIT and 19 (8%) T-SPOT.TB test results were indeterminate. The agreement among all pairs of tests was poor: QFT-GIT vs. T-SPOT.TB (κ = 0.18, 95% CI .07-.30), QFT-GIT vs. TST (κ = 0.29, 95% CI .16-.42), and TST vs. T-SPOT.TB (κ = 0.22, 95% CI .07-.29). Risk factors for LTBI varied by diagnostic test and none showed associations between positive test results and well-known risk factors for TB, such as imprisonment, drug abuse and immunological status. CONCLUSIONS A high proportion of HIV patients had at least one positive diagnostic test for LTBI; however, there was very poor agreement among all tests. This lack of agreement makes it difficult to know which test is superior and most appropriate for LTBI testing among HIV-infected patients. While further follow-up studies will help determine the predictive ability of different LTBI tests, improved modalities are needed for accurate detection of LTBI and assessment of risk of developing active TB among HIV-infected patients.
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Vashakidze S, Gogishvili S, Nikolaishvili K, Dzidzikashvili N, Tukvadze N, Blumberg HM, Kempker RR. Favorable outcomes for multidrug and extensively drug resistant tuberculosis patients undergoing surgery. Ann Thorac Surg 2013; 95:1892-8. [PMID: 23642435 PMCID: PMC3728898 DOI: 10.1016/j.athoracsur.2013.03.067] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/11/2013] [Revised: 02/25/2013] [Accepted: 03/27/2013] [Indexed: 11/21/2022]
Abstract
BACKGROUND New approaches are needed in the treatment of multidrug-resistant and extensively drug-resistant pulmonary tuberculosis (M/XDR-PTB). We evaluated the role of adjunctive surgical therapy in the treatment of M/XDR-PTB in the setting of directly observed treatment strategy (DOTS)-Plus implementation. METHODS We conducted an observational cohort study consisting of M/XDR-PTB patients who underwent thoracic surgery at the National Tuberculosis Center in Tbilisi, Georgia between October 2008 and February 2011. Indications for surgery included presence of M/XDR-PTB, localized pulmonary disease, fit to undergo surgery, and either medical treatment failure or such extensive drug resistance that failure was likely. Second-line anti-tuberculosis medical therapy was administered per World Health Organization (WHO) recommendations. RESULTS Seventy-five patients (51 MDR, 24 XDR) with PTB underwent adjunctive thoracic surgery. Median age was 30 years and average duration of preoperative M/XDR-PTB medical therapy was 342 days. The following surgical procedures were performed: pneumonectomy (11%), lobectomy (54%), and segmentectomy (35%). Mean postoperative follow-up time was 372 days. Of 72 patients with evaluable outcomes, 59 (82%) had favorable outcomes including 90% of MDR and 67% of XDR-TB patients. There was no postoperative mortality; postoperative complications occurred in 7 patients (9%). Risk factors for poor treatment outcomes in univariate analysis included bilateral disease, XDR, increasing effective drugs received, positive preoperative sputum culture, and major postoperative surgical complication. CONCLUSIONS Patients with M/XDR-PTB undergoing adjunctive thoracic surgery had high rates of favorable outcomes, no surgical-related mortality, and low rates of complications. Adjunctive surgery appears to play an important role in the treatment of select patients with M/XDR-PTB.
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Marks SM, Cronin W, Venkatappa T, Maltas G, Chon S, Sharnprapai S, Gaeddert M, Tapia J, Dorman SE, Etkind S, Crosby C, Blumberg HM, Bernardo J. The health-system benefits and cost-effectiveness of using Mycobacterium tuberculosis direct nucleic acid amplification testing to diagnose tuberculosis disease in the United States. Clin Infect Dis 2013; 57:532-42. [PMID: 23697743 DOI: 10.1093/cid/cit336] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND The utility of Mycobacterium tuberculosis direct nucleic acid amplification testing (MTD) for pulmonary tuberculosis disease diagnosis in the United States has not been well described. METHODS We analyzed a retrospective cohort of reported patients with suspected active pulmonary tuberculosis in 2008-2010 from Georgia, Hawaii, Maryland, and Massachusetts to assess MTD use, effectiveness, health-system benefits, and cost-effectiveness. RESULTS Among 2140 patients in whom pulmonary tuberculosis was suspected, 799 (37%) were M. tuberculosis-culture-positive. Eighty percent (680/848) of patients having acid-fast-bacilli-smear-positive specimens had MTD performed; MTD positive-predictive value (PPV) was 98% and negative-predictive value (NPV) was 94%. Nineteen percent (240/1292) of patients having smear-negative specimens had MTD; MTD PPV was 90% and NPV was 88%. Among patients suspected of tuberculosis but not having MTD, smear PPV for lab-confirmed tuberculosis was 77% and NPV 78%. Compared with no MTD, MTD significantly decreased time to diagnosis in patients with smear-positive/MTD-positive specimens, decreased respiratory isolation for patients having smear-positive/MTD-negative/culture-negative specimens, decreased outpatient days of unnecessary tuberculosis medications, and reduced resources expended on contact investigation. While MTD generally cost more than no MTD, incremental cost savings occurred in patients with human immunodeficiency virus (HIV) or homelessness to diagnose or to exclude tuberculosis, and in patients with substance abuse having smear-negative specimens to exclude tuberculosis. CONCLUSIONS MTD improved diagnostic accuracy and timeliness and reduced unnecessary respiratory isolation, treatment, and contact investigations. It was cost saving in patients with HIV, homelessness, or substance abuse, but not in others.
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Frediani JK, Tukvadze N, Sanikidze E, Gegechkori M, Kempker RR, Millson EC, Hebbar G, Blumberg HM, Ziegler TR. Dietary Micronutrient Intake of Pulmonary TB patients in Tbilisi, Georgia. FASEB J 2013. [DOI: 10.1096/fasebj.27.1_supplement.619.3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Alemu AS, Kempker RR, Tenna A, Smitson C, Berhe N, Fekade D, Blumberg HM, Aseffa A. High prevalence of Cryptococcal antigenemia among HIV-infected patients receiving antiretroviral therapy in Ethiopia. PLoS One 2013; 8:e58377. [PMID: 23469276 PMCID: PMC3587601 DOI: 10.1371/journal.pone.0058377] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2012] [Accepted: 02/04/2013] [Indexed: 11/19/2022] Open
Abstract
Background Cryptococcal disease is estimated to be responsible for significant mortality in Sub-Saharan Africa; however, only scarce epidemiology data exists. We sought to evaluate the prevalence of and risk factors for cryptococcal antigenemia in Ethiopia. Methods Consecutive adult HIV-infected patients from two public HIV clinics in Addis Ababa, Ethiopia were enrolled into the study. A CD4 count ≤200 cells/μl was required for study participation. Patients receiving anti-retroviral therapy (ART) were not excluded. A cryptococcal antigen test was performed for all patients along with an interview, physical exam, and medical chart abstraction. Logistic regression analysis was used to assess risk factors for cryptococcal antigenemia. Results 369 HIV-infected patients were enrolled; mean CD4 123 cells/μl and 74% receiving ART. The overall prevalence of cryptococcal antigenemia was 8.4%; 11% in patients with a CD4 count <100 cells/μl, 8.9% with CD4 100 to 150 cells/μl and 5.7% with CD4150-200 cell/μl. 84% of patients with cryptococcal antigenemia were receiving ART. In multivariable analysis, increasing age, self reported fever, CD4 count <100 cells/μl, and site of screening were associated with an increased risk of cryptococcal antigenemia. No individual or combination of clinical symptoms had optimal sensitivity or specificity for cryptococcal antigenemia. Conclusion Cryptococcal antigenemia is high in Ethiopia and rapid scale up of screening programs is needed. Screening should be implemented for HIV-infected patients with low CD4 counts regardless of symptoms or receipt of ART. Further study into the effect of location and environment on cryptococcal disease is warranted.
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Rabin AS, Kuchukhidze G, Sanikidze E, Kempker RR, Blumberg HM. Prescribed and self-medication use increase delays in diagnosis of tuberculosis in the country of Georgia. Int J Tuberc Lung Dis 2012; 17:214-20. [PMID: 23228464 DOI: 10.5588/ijtld.12.0395] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
SETTING Georgia has a high burden of tuberculosis (TB), including multidrug-resistant TB. Enhancing early diagnosis of TB is a priority to reduce transmission. OBJECTIVE To quantify delays in TB diagnosis and identify risk factors for delay in the country of Georgia. DESIGN In a cross-sectional study, persons with newly diagnosed, culture-confirmed pulmonary TB were interviewed within 2 months of diagnosis and medical and laboratory records were abstracted. RESULTS Among 247 persons enrolled, the mean and median total TB diagnostic delay was respectively 89.9 and 59.5 days. The mean and median patient delay was 56.2 and 23.5 days, while health care system delay was 33.7 and 14.0 days. In multivariable analysis, receipt of a medication prior to TB diagnosis was associated with increased overall diagnostic delay (adjusted odds ratio [aOR] 2.28, 95%CI 1.09-4.79); antibiotic use prior to diagnosis increased the risk of prolonged health care delay (aOR 4.16, 95%CI 1.97-8.79). TB cases who had increased patient-related diagnostic delay were less likely to have prolonged health care diagnostic delay (aOR 0.38, 95%CI 0.19-0.74). CONCLUSION Prolonged delays in detecting TB are common in Georgia. Interventions addressing the misuse of antibiotics and targeting groups at risk for prolonged delay are warranted to reduce diagnostic delays and enhance TB control.
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Zhao VM, Griffith DP, Blumberg HM, Dave NJ, Battey CH, McNally TA, Easley KA, Galloway JR, Ziegler TR. Characterization of post-hospital infections in adults requiring home parenteral nutrition. Nutrition 2012; 29:52-9. [PMID: 22858199 DOI: 10.1016/j.nut.2012.03.010] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2011] [Revised: 03/14/2012] [Accepted: 03/14/2012] [Indexed: 11/28/2022]
Abstract
OBJECTIVE Limited data are available on the incidence and risk factors for infection in patients requiring home parenteral nutrition (HPN). METHODS A retrospective study was conducted in 101 consecutive adults (63 female, 38 male) discharged on HPN from the Emory University Hospital, Atlanta, GA. New bloodstream infections (BSIs) requiring rehospitalization and other infections were evaluated. RESULTS Most infections (75%) developed during the initial 6 mo after hospital discharge; rates of BSI were particularly high during the first 4 mo. Fifty-six patients (55.4%) developed 102 BSIs (11.5 BSIs/1000 catheter-days). Most BSIs were attributed to gram-positive organisms (46%), including coagulase-negative Staphylococcus, Staphylococcus aureus, Enterococcus species, and others, followed by Candida species (20%) and gram-negative organisms (13%). Twenty-one percent of BSIs were polymicrobial. The BSI incidence rate ratio was significantly increased for patients with mean prehospital discharge blood glucose concentrations in the highest quartile versus the lowest quartile (incidence rate ratio 2.4, P = 0.017). Patients with a peripherally inserted central catheter versus non-peripherally inserted central catheter central venous catheters had significantly higher rates of BSI (P = 0.018). Thirty-nine patients (38.6%) developed 81 non-BSIs, including pneumonia, urinary tract infections, and surgical site infections. Postdischarge PN dextrose, lipid, and total calorie doses were unrelated to BSI but were variably related to the rate of non-BSIs. CONCLUSIONS Adult patients on HPN exhibit a very high incidence of post-hospital infections. Higher mean blood glucose levels during predischarge hospitalization and the use of peripherally inserted central catheters at discharge are associated with an increased risk of BSI in the postdischarge home setting.
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Desai NS, Tukvadze N, Frediani J, Kipiani M, Sanikidze E, Nichols MM, Hebbar G, Kempker RR, Mirtskhulava V, Kalandadze I, Seydafkan S, Sutaria N, Chen TC, Blumberg HM, Ziegler TR, Tangpricha V. Effects of sunlight and diet on vitamin D status of pulmonary tuberculosis patients in Tbilisi, Georgia. Nutrition 2012; 28:362-6. [PMID: 22304856 PMCID: PMC3303957 DOI: 10.1016/j.nut.2011.08.012] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2011] [Revised: 08/19/2011] [Accepted: 08/19/2011] [Indexed: 01/21/2023]
Abstract
OBJECTIVE Vitamin D deficiency is common in tuberculosis (TB) and this may modulate immune responses. This study investigated vitamin D status in patients with TB and examined the sources of vitamin D in Tbilisi, Georgia. METHODS We measured plasma 25-hydroxyvitamin D (25[OH]D) and dietary vitamin D intake in patients with pulmonary TB (n = 85) in Tbilisi, Georgia. To determine the impact of season on vitamin D status, we tested the in vitro conversion of 7-dehydrocholesterol (7-DHC) to previtamin D(3) after sunlight exposure. RESULTS In subjects with TB, mean plasma 25(OH)D concentrations were 14.4 ± 7.0 ng/mL, and vitamin D insufficiency (25[OH]D <30 ng/mL) occurred in 97% of subjects. The dietary sources of vitamin D were mainly fish, eggs, and butter. The daily intake was well below recommended daily intakes in subjects with TB (172 ± 196 IU). The conversion of 7-DHC to previtamin D(3) was undetectable from October to March and highest in June and July from 11:00 to 14:00 h. CONCLUSION An insufficient vitamin D dietary intake and a limited production of vitamin D from sunlight for most of the year may explain the high prevalence of vitamin D insufficiency in patients with TB in Tbilisi.
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Gegia M, Kalandadze I, Kempker RR, Magee MJ, Blumberg HM. Adjunctive surgery improves treatment outcomes among patients with multidrug-resistant and extensively drug-resistant tuberculosis. Int J Infect Dis 2012; 16:e391-6. [PMID: 22425494 DOI: 10.1016/j.ijid.2011.12.018] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2011] [Accepted: 12/13/2011] [Indexed: 11/16/2022] Open
Abstract
OBJECTIVES To determine risk factors for poor outcomes among patients with pulmonary multidrug- or extensively drug-resistant (M/XDR) tuberculosis (TB) in Georgia. METHODS This was a prospective, population-based observational cohort study. RESULTS Among 380M/XDR-TB patients (mean age 38 years), 179 (47%) had a poor outcome: 59 (16%) died, 37 (10%) failed, and 83 (22%) defaulted. Newly diagnosed M/XDR-TB cases were significantly more likely to have a favorable outcome than retreatment cases (odds ratio (OR) 4.26, 95% confidence interval (CI) 1.99-9.10, p<0.001). In the multivariable analysis, independent risk factors for a poor treatment outcome included previous treatment history (OR 2.92, 95% CI 1.29-6.58), bilateral disease (OR 1.90, 95% CI 1.20-3.01), body mass index (BMI, kg/m(2)) ≤18.5 (OR 1.91, 95% CI 1.11-3.29), and XDR-TB (OR 2.28, 95% CI 1.11-4.71). Patients who underwent surgical resection (OR 0.27, 95% CI 0.11-0.64) and had sputum culture conversion by 4 months (OR 0.33, 95% CI 0.21-0.52) were significantly less likely to have poor treatment outcomes. CONCLUSIONS Adjunctive surgery appeared to be beneficial in treating patients with M/XDR-TB. Retreatment cases, XDR-TB, bilateral disease, and low BMI were associated with a poor outcome. Additional studies are needed to further define the apparent beneficial role of surgery in the treatment of M/XDR-TB.
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Leeds IL, Magee MJ, Kurbatova EV, del Rio C, Blumberg HM, Leonard MK, Kraft CS. Site of extrapulmonary tuberculosis is associated with HIV infection. Clin Infect Dis 2012; 55:75-81. [PMID: 22423123 DOI: 10.1093/cid/cis303] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND In the United States, the proportion of patients with extrapulmonary tuberculosis (EPTB) has increased relative to cases of pulmonary tuberculosis. Patients with central nervous system (CNS)/meningeal and disseminated EPTB and those with human immunodeficiency virus (HIV)/AIDS have increased mortality. The purpose of our study was to determine risk factors associated with particular types of EPTB. METHODS We retrospectively reviewed 320 cases of EPTB from 1995-2007 at a single urban US public hospital. Medical records were reviewed to determine site of EPTB and patient demographic and clinical characteristics. Multivariable logistic regression analyses were performed to determine independent associations between patient characteristics and site of disease. RESULTS Patients were predominantly male (67%), African American (82%), and US-born (76%). Mean age was 40 years (range 18-89). The most common sites of EPTB were lymphatic (28%), disseminated (23%), and CNS/meningeal (22%) disease. One hundred fifty-four (48.1%) were HIV-infected, 40% had concomitant pulmonary tuberculosis, and 14.7% died within 12 months of EPTB diagnosis. Multivariable analysis demonstrated that HIV-infected patients were less likely to have pleural (adjusted odds ratio [AOR] 0.3; 95% confidence interval [CI] .2, .6) as site of EPTB disease than HIV-uninfected patients. Among patients with EPTB and HIV-infection, patients with CD4 lymphocyte cell count <100 were more likely to have severe forms of EPTB (CNS/meningeal and/or disseminated) (AOR 1.6; 95% CI, 1.0, 2.4). CONCLUSIONS Among patients hospitalized with EPTB, patients coinfected with HIV and low CD4 counts were more likely to have CNS/meningeal and disseminated disease. Care for similar patients should include consideration of these forms of EPTB since they carry a high risk of death.
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Magee MJ, Blumberg HM, Broz D, Furner SE, Samson L, Singh S, Hershow RC. Prevalence of drug resistant tuberculosis among patients at high-risk for Hiv attending outpatient clinics in Delhi, India. THE SOUTHEAST ASIAN JOURNAL OF TROPICAL MEDICINE AND PUBLIC HEALTH 2012; 43:354-63. [PMID: 23082587 DOI: pmid/23082587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
We sought to determine tuberculosis (TB) prevalence including multidrug resistant (MDR)-TB among a cohort of high risk patients at two directly observed treatment short course (DOTS) clinics in Delhi, India. We also aimed to compare the sensitivity of acid-fast bacilli (AFB) smear tests for patients with HIV using sputum cultures as the gold standard. A cross-section study was conducted among adult patients (> or = 18 years old) with prolonged cough (greater than two weeks), night sweats, fever, and/or weight loss suspected of pulmonary TB between February and March 2006. Sputum samples were obtained and processed for 165 patients; 53 (32.1%) were culture positive for TB. Patients with TB were predominantly male (92.1%), young (median age of 32 years), and the HIV-seroprevalence was high (41.5%). In the multivariable analysis adjusted for age, HIV infection was significantly associated (POR = 2.0, p < 0.05) with the presence of TB disease. Among Mycobacterium tuberculosis isolates recovered from 53 cases, 25 (47.2%) were resistant to > or = 1 first line anti-TB drugs and 7 (13.2%) were MDR-TB. The sensitivity of AFB smears among HIV negative and positive participants was 35.5% and 18.0%, respectively. Our findings demonstrated that the sensitivity of AFB smears to detect TB among HIV positive patients was low. Additionally, we found that even in regions where population drug resistance estimates are low, sentinel surveillance of MDR-TB in high-risk populations is useful to prioritize target groups in need of additional prevention, monitoring and health outreach.
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Tukvadze N, Kempker RR, Kalandadze I, Kurbatova E, Leonard MK, Apsindzelashvili R, Bablishvili N, Kipiani M, Blumberg HM. Use of a molecular diagnostic test in AFB smear positive tuberculosis suspects greatly reduces time to detection of multidrug resistant tuberculosis. PLoS One 2012; 7:e31563. [PMID: 22347495 PMCID: PMC3276512 DOI: 10.1371/journal.pone.0031563] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2011] [Accepted: 01/13/2012] [Indexed: 11/18/2022] Open
Abstract
Background The WHO has recommended the implementation of rapid diagnostic tests to detect and help combat M/XDR tuberculosis (TB). There are limited data on the performance and impact of these tests in field settings. Methods The performance of the commercially available Genotype MTBDRplus molecular assay was compared to conventional methods including AFB smear, culture and drug susceptibility testing (DST) using both an absolute concentration method on Löwenstein-Jensen media and broth-based method using the MGIT 960 system. Sputum specimens were obtained from TB suspects in the country of Georgia who received care through the National TB Program. Results Among 500 AFB smear-positive sputum specimens, 458 (91.6%) had both a positive sputum culture for Mycobacterium tuberculosis and a valid MTBDRplus assay result. The MTBDRplus assay detected isoniazid (INH) resistance directly from the sputum specimen in 159 (89.8%) of 177 specimens and MDR-TB in 109 (95.6%) of 114 specimens compared to conventional methods. There was high agreement between the MTBDRplus assay and conventional DST results in detecting MDR-TB (kappa = 0.95, p<0.01). The most prevalent INH resistance mutation was S315T (78%) in the katG codon and the most common rifampicin resistance mutation was S531L (68%) in the rpoB codon. Among 13 specimens from TB suspects with negative sputum cultures, 7 had a positive MTBDRplus assay (3 with MDR-TB). The time to detection of MDR-TB was significantly less using the MTBDRplus assay (4.2 days) compared to the use of standard phenotypic tests (67.3 days with solid media and 21.6 days with broth-based media). Conclusions Compared to conventional methods, the MTBDRplus assay had high accuracy and significantly reduced time to detection of MDR-TB in an area with high MDR-TB prevalence. The use of rapid molecular diagnostic tests for TB and drug resistance should increase the proportion of patients promptly placed on appropriate therapy.
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