RESUMO
We prospectively evaluated a multiplex real-time PCR assay (SeptiFast, SF) in a cohort of patients undergoing allo-BMT in comparison to an in-house PCR method (IH-PCR). Overall 847 blood samples (mean 8 samples/patient) from 104 patients with haematological malignancies were analysed. The majority of patients had acute leukaemia (62%) with a mean age of 52 years (54% female). Pathogens could be detected in 91 of 847 (11%) samples by SF compared to 38 of 205 (18.5%) samples by BC, and 57 of 847 (6.7%) samples by IH-PCR. Coagulase-negative staphylococci (n=41 in SF, n=29 in BC) were the most frequently detected bacteria followed by Escherichia coli (n=9 in SF, n=6 in BC). Candida albicans (n=17 in SF, n=0 in BC, n=24 in IH-PCR) was the most frequently detected fungal pathogen. SF gave positive results in 5% of samples during surveillance vs in 26% of samples during fever episodes. Overall, the majority of blood samples gave negative results in both PCR methods resulting in 93% overall agreement resulting in a negative predictive value of 0.96 (95% CI: 0.95-0.97), and a positive predictive value of 0.10 (95% CI: -0.01 to 0.21). SeptiFast appeared to be superior over BC and the IH-PCR method.
Assuntos
Bactérias/isolamento & purificação , Fungos/isolamento & purificação , Doenças Hematológicas/terapia , Reação em Cadeia da Polimerase Multiplex/métodos , Reação em Cadeia da Polimerase em Tempo Real/métodos , Sepse/diagnóstico , Transplante de Células-Tronco/efeitos adversos , Adulto , Idoso , Bacteriemia/diagnóstico , Bacteriemia/etiologia , Bacteriemia/microbiologia , Bactérias/classificação , Bactérias/genética , Feminino , Fungemia/diagnóstico , Fungemia/etiologia , Fungemia/microbiologia , Fungos/classificação , Fungos/genética , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Prospectivos , Sepse/etiologia , Sepse/microbiologia , Adulto JovemRESUMO
Diagnosis of invasive pulmonary aspergillosis (IPA) is challenging. The objective of the study was to assess the value of microbiological tests to the diagnosis of IPA in the absence of non-specific radiological data. A retrospective study of 23 patients with suspicion of IPA and positivity of some microbiological diagnostic tests was performed. These tests included conventional microbiological culture, detection of Aspergillus galactomannan (GM) antigen and in some patients (1 â 3)-ß-D-glucan (BDG) and Aspergillus fumigatus DNA using the LightCycler® SeptiFast test. In 10 patients with hematological malignancy, 6 cases were considered 'probable' and 4 'non-classifiable.' In 8 patients with chronic lung disease, 7 cases were classified as 'probable' and 1 as 'proven,' and in 5 patients with prolonged ICU stay (>7 days), there were 2 'proven' cases, 2 'non-classifiable' and 1 putative case. Microbiological culture was positive in 17 cases and 18 Aspergillus spp. were isolated (one mixed culture). A. fumigatus was the most frequent (44.4%) followed by A. tubingensis. The Aspergillus galactomannan (GM) antigen assay was positive in 21 cases (91.3%). The GM antigen and the (1 â 3)-ß-D-glucan (BDG) assays were both performed in 12 cases (52.2%), being positive in 9. The SeptiFast test was performed in 7 patients, being positive in 4. In patients with non-classifiable pulmonary aspergillosis and one or more positive microbiological tests, radiological criteria may not be considered a limiting factor for the diagnosis of IPA.
Assuntos
Aspergillus fumigatus/isolamento & purificação , Testes Diagnósticos de Rotina/métodos , Aspergilose Pulmonar Invasiva/diagnóstico , Aspergilose Pulmonar Invasiva/patologia , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Animais , Feminino , Humanos , Aspergilose Pulmonar Invasiva/microbiologia , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos , Adulto JovemRESUMO
BACKGROUND: Antimicrobially pre-treated children with systemic inflammation often pose a diagnostic challenge to the physician. We aimed to evaluate the additional use of SeptiFast multiplex polymerase chain reaction (PCR) to identify causative pathogens in children with suspected systemic bacterial or fungal infection. METHODS: Prospective observational study in 39 children with systemic inflammatory response syndrome (SIRS) under empiric antibiotic treatment. Primary outcome was the rate of positive blood cultures (BC), compared to the rate of positive SeptiFast (SF) results. RESULTS: In total, 14 SF-samples yielded positive results, compared to 4 positive BC (p < 0.05). All blood cultures and 13 of 14 positive SF-tests were considered infection. Median time for positive BC was 2 days, and time to definite result was 6 days, compared to 12 h for SF. Antimicrobial therapy was adapted in 7 of the 14 patients with positive SeptiFast, and in 3 of the 4 patients with positive BC. Best predictive power for positive SF shown by receiver-operating characteristic was demonstrated for procalcitonin PCT (Area under the curve AUC: 0.79), compared to C-reactive protein CRP (AUC: 0.51) and leukocyte count (AUC: 0.46). A procalcitonin threshold of 0.89 ng/ml yielded a sensitivity of 0.82 and a specifity of 0.7. Children with a positive SeptiFast result on day 0 had a significantly higher risk to require treatment on the Pediatric Intensive Care Unit or to be deceased on day 30 (Odds-Ratio 8.62 (CI 1.44-51.72). CONCLUSIONS: The additional testing with SeptiFast in antimicrobially pre-treated children with systemic inflammation enhances the rate of pathogen detection. The influence of multiplex PCR on clinically relevant outcome parameters has to be further evaluated. ( TRIAL REGISTRATION: DRKS00004694).
Assuntos
Bacteriemia/diagnóstico , Fungemia/diagnóstico , Síndrome de Resposta Inflamatória Sistêmica/diagnóstico , Adolescente , Antibacterianos/uso terapêutico , Área Sob a Curva , Aspergillus fumigatus/genética , Bacteriemia/tratamento farmacológico , Bacteriemia/metabolismo , Bacteriemia/microbiologia , Proteína C-Reativa/metabolismo , Calcitonina/metabolismo , Candida/genética , Criança , Pré-Escolar , Enterococcus/genética , Escherichia coli/genética , Feminino , Fungemia/tratamento farmacológico , Fungemia/metabolismo , Fungemia/microbiologia , Humanos , Lactente , Recém-Nascido , Klebsiella/genética , Masculino , Reação em Cadeia da Polimerase Multiplex , Estudos Prospectivos , Pseudomonas/genética , Reação em Cadeia da Polimerase em Tempo Real , Sensibilidade e Especificidade , Sepse/diagnóstico , Sepse/metabolismo , Sepse/microbiologia , Staphylococcus aureus/genética , Streptococcus/genética , Síndrome de Resposta Inflamatória Sistêmica/metabolismo , Síndrome de Resposta Inflamatória Sistêmica/microbiologiaRESUMO
OBJECTIVES: The diagnosis of invasive Candida infection remains challenging because of tests with slow turnaround times or mediocre performance. T2magnetic resonance imaging is a new diagnostic tool. We investigated the diagnostic accuracy of the T2Candida panel (T2) in comparison with blood culture (BC) and the SeptiFast (SF) for the detection of five different Candida species among high-risk intensive care unit patients with suspected candidemia. METHODS: We analysed blood samples collected from patients with suspected candidemia (177 samples from 138 patients) from August 2018 to April 2020. Blood samples were collected and analysed concurrently by BC, SF, and T2Candida. Subsequently, based on clinical and microbiological findings, patient samples were assigned to specific risk categories (proven, probable, and no candidemia). RESULTS: Twenty-two samples from 17 patients were classified as proven candidemia, and 15 samples from 14 patients were classified as probable candidemia. A sensitivity of 68.2% (95% CI, 45-86%) was observed for the BC and the SF, and a sensitivity of 63.6% (95% CI, 41-83%) was observed for the T2 when only cases with proven candidemia were evaluated. For proven and probable candidemia, the sensitivity was 40.5% (95% CI, 23-58%) for BC, 81.1% (95% CI, 65-92%) for SF, and 73.0% (95% CI, 56-86%) for T2. DISCUSSION: The diagnostic performance of SF and T2 was similar. For samples with proven/probable candidemia, SF and T2 had a higher sensitivity compared to BC. Used in conjunction with other diagnostic methods, T2 can replace the no longer available SF for the diagnosis of candidemia, enabling the timely initiation of targeted antifungal therapy.
Assuntos
Hemocultura , Candida , Candidemia , Sensibilidade e Especificidade , Humanos , Candidemia/diagnóstico , Candida/isolamento & purificação , Candida/classificação , Masculino , Feminino , Pessoa de Meia-Idade , Idoso , Hemocultura/métodos , Adulto , Idoso de 80 Anos ou mais , Unidades de Terapia Intensiva , Imageamento por Ressonância MagnéticaRESUMO
Detection of etiological agents is pivotal for adequate therapy of osteoarticular bacterial infections. Culture often lacks sensitivity, especially in patients under antibiotic therapy. The present study investigates the potential clinical utility of the commercial multiplex real-time polymerase chain reaction SeptiFast® (SF) in the etiological diagnosis of osteoarticular infections. Results obtained from conventional culture and SF were compared in 86 osteoarticular specimens collected from patients with suspected infection. The number of specimens positive by SF (38/86, 44.18%) was significantly greater (Pâ¯=â¯0.001) than that of specimens positive by culture (20/86, 23.25%). The sensitivity of SF was 48.71%, significantly higher than culture sensitivity (25.64%). Specificity was 100% for both tests. The overall diagnostic accuracy for SF was 53.48%, and that of culture was 32.55%. Even with the limitation of the low number of specimens, this study supports the usefulness of SF in the diagnosis of osteoarticular infections.
Assuntos
Artrite Infecciosa/diagnóstico , Artrite Infecciosa/microbiologia , Bactérias/isolamento & purificação , Infecções Bacterianas/diagnóstico , Reação em Cadeia da Polimerase Multiplex , Antibacterianos/uso terapêutico , Artrite Infecciosa/tratamento farmacológico , Bactérias/efeitos dos fármacos , Infecções Bacterianas/tratamento farmacológico , Biópsia , Humanos , Valor Preditivo dos Testes , Próteses e Implantes/microbiologia , Kit de Reagentes para Diagnóstico , Sensibilidade e Especificidade , Coluna Vertebral/patologia , Líquido Sinovial/microbiologiaRESUMO
INTRODUCTION: This study was performed to investigate the value of acute phase reactants and LightCycler® SeptiFast test to differentiate bacterial and viral infections. POPULATION AND METHODS: Children with fever were enrolled to this prospective study. Peripheral white blood cell (WBC), C-reactive protein (CRP) and procalcitonin (PCT) were studied from all patients on day 1, 3 and 7. Blood culture and chest X-ray were also obtained on day 1. Blood samples for LightCycler® SeptiFast test were obtained in all patients to use them if there was uncertain diagnosis between bacterial or viral infection. The patients were divided into two groups as bacterial and viral infection. RESULTS: A total of 94 children with fever were enrolled. The mean value of fever was significantly higher in bacterial group than viral group (p <0.001). In bacterial infection group, 34 (72.3%) patients had negative blood culture. Of those, 12 (35.2%) had positive SeptiFast test. There were no positive blood culture in patients with viral infection group and all of them had negative SeptiFast test. The mean levels of CRP on the first day of admission were significantly higher in bacterial group than viral group (p <0.001). CRP and PCT levels of day 3 and 7 were significantly higher in bacterial group (p <0.001). The sensitivity and specificity levels of WBC, CRP and PCT were 63.8%, 44.7%, 74.5% and 78.7% ,68.1% and 100%, respectively. CONCLUSIONS: We found that acute phase reactants, especially PCT, and LightCycler® SeptiFast test may help to differentiate bacterial and viral infections.
INTRODUCCIÓN: Evaluamos el nivel de reactantes de fase aguda y la prueba LightCycler® SeptiFast para diferenciar infecciones bacterianas vs. irales. MÉTODOS: Estudio prospectivo en niños febriles. Se analizaron recuento de leucocitos, proteína C-reactiva y procalcitonina en días 1, 3 y 7 de hospitalización. El día 1 se realizaron hemocultivo y radiografía de tórax. Se evaluaron dos grupos de niños que presentaron infecciones bacterianas o virales. RESULTADOS: Se incluyeron 94 niños febriles. La temperatura media de la fiebre fue significativamente más alta en niños con infecciones bacterianas que con infecciones virales (p < 0,001). En 34 (72,3%) niños con infecciones bacterianas, el hemocultivo fue negativo. De ellos, 12 (35,2%) presentaron prueba SeptiFast positiva. No hubo resultados positivos en hemocultivos de niños con infecciones virales y todos tuvieron resultado negativo para la prueba SeptiFast. La media de proteína C-reactiva el primer día de hospitalización fue significativamente más alta en el grupo con infecciones bacterianas (p < 0,001) y en los días 3 y 7 junto con la procalcitonina fueron significativamente más altas en niños con infecciones bacterianas (p <0,001). La sensibilidad y especificidad de los leucocitos, la proteína C-reactiva y la procalcitonina fueron 63,8%, 44,7%, 74,5% y 78,7%, 68,1% y 100%, respectivamente. Las áreas bajo la curva de los leucocitos, la proteína C-reactiva y la procalcitonina fueron 0,519, 0,764 y 0,835, respectivamente. CONCLUSIONES: Los reactantes de fase aguda, en especial procalcitonina, y la prueba LightCycler® SeptiFast podrían ayudar a diferenciar infecciones bacterianas de virales.
Assuntos
Proteínas de Fase Aguda/análise , Infecções Bacterianas/sangue , Infecções Bacterianas/diagnóstico , Reação em Cadeia da Polimerase Multiplex , Reação em Cadeia da Polimerase em Tempo Real , Viroses/sangue , Viroses/diagnóstico , Criança , Pré-Escolar , Diagnóstico Diferencial , Feminino , Humanos , Lactente , Masculino , Estudos ProspectivosRESUMO
PURPOSE: There is a need for identification of marker that could lead physicians to take the right step towards laboratory techniques for documentation of infection. The aim of this study was to investigate whether presepsin and procalcitonin (PCT) levels in patients with suspected sepsis could predict blood culture (BC) and SeptiFast (SF) results. MATERIAL AND METHODS: 100 patients were included in our study. PCT, C-reactive protein (CRP), and presepsin levels were determined. Differences between groups of patients were assessed by Mann-Whitney U test. Categorical variables were compared using chi-square test. Receiver operating characteristic (ROC) curves were plotted to determine predictive values of biomarkers for prediction of positive SF results. RESULTS: PCT (70.9±106.36 vs. 16.35±26.79) and presepsin (4899.73±5207.81 vs. 1751.59±2830.62) were significantly higher in patients with positive SF in contrast to patients with negative SF. There was no significant difference between patients who had positive and negative BC for PCT and presepsin values. PCT and presepsin showed a similar performance in predicting positive SF results with AUC of 0.75 for PCT and 0.73 for presepsin. CONCLUSION: Presepsin can serve as good predictor of bacteremia detected by SF and it should be included with PCT in protocols for sepsis diagnosing.
Assuntos
Bacteriemia/diagnóstico , Biomarcadores/sangue , Calcitonina/sangue , Receptores de Lipopolissacarídeos/sangue , Fragmentos de Peptídeos/sangue , Adulto , Idoso , Idoso de 80 Anos ou mais , Bacteriemia/sangue , Proteína C-Reativa/análise , Estado Terminal , Diagnóstico Precoce , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Valor Preditivo dos Testes , Curva ROC , Adulto JovemRESUMO
BACKGROUND: In recent years a multiplex real-time PCR (SeptiFast) has been introduced, allowing detection of 25 common blood pathogens considerably faster than conventional blood culture. METHODS: SeptiFast was applied routinely in addition to blood culture in cases of critically ill patients with fever and other signs of severe systemic infections. In this study data of 470 episodes were retrospectively analysed to assess the impact of various parameters, such as clinical indications, assigning ward and antimicrobial treatment on test outcome using a multivariate logistic model. RESULTS: After exclusion of microorganisms classified as contaminants, the concordance between SeptiFast and blood culture was 85.5%. SeptiFast detected 98 out of 120, while blood culture merely found 63 out of 120 potential pathogens. In comparison to blood culture, SeptiFast showed considerably higher positivity rates in sepsis, pneumonia and febrile immunosuppression and a lower rate in endocarditis. The highest positivity and concordance between tests was shown in patients from the emergency room (P = 0.007). CONCLUSIONS: The results obtained in this study are similar to those from prospective settings confirming the robustness of the SeptiFast assay in routine use. Our data suggest that SeptiFast is a valuable add-on to blood culture and may increase the diagnostic efficiency of a microbiological laboratory.
Assuntos
Bacteriemia/sangue , Bacteriemia/diagnóstico , Hemocultura/métodos , Testes Diagnósticos de Rotina/métodos , Reação em Cadeia da Polimerase/métodos , Sepse/sangue , Sepse/diagnóstico , Adulto , Idoso , Bacteriemia/microbiologia , Feminino , Humanos , Estudos Longitudinais , Masculino , Pessoa de Meia-Idade , Reprodutibilidade dos Testes , Sensibilidade e Especificidade , Sepse/microbiologia , Adulto JovemRESUMO
For evaluation of the Anagnostics Pathogens DNA xA (PxA) assay in the diagnosis of sepsis 58 blood specimens were tested in comparison with the LightCycler SeptiFast assay and blood culture as gold standard. The PxA assay had a lower sensitivity (0.63 vs. 0.8), but higher specificity (0.83 vs. 0.67) than SeptiFast.
Assuntos
Reação em Cadeia da Polimerase Multiplex/métodos , Reação em Cadeia da Polimerase em Tempo Real/métodos , Sepse/diagnóstico , Bacteriemia/sangue , Bacteriemia/diagnóstico , Bacteriemia/microbiologia , Patógenos Transmitidos pelo Sangue/isolamento & purificação , DNA Bacteriano/sangue , DNA Fúngico/sangue , Feminino , Fungemia/sangue , Fungemia/diagnóstico , Fungemia/microbiologia , Humanos , Masculino , Pessoa de Meia-Idade , Projetos Piloto , Sensibilidade e Especificidade , Sepse/sangue , Sepse/microbiologiaRESUMO
OBJECTIVE: To determine whether a multiplex polymerase chain reaction (PCR)-based test could reduce the time required for initial pathogen identification in patients in an intensive care unit (ICU) setting. METHODS: This double-blind, parallel-group randomized controlled trial** enrolled adults with suspected pulmonary or abdominal sepsis caused by an unknown pathogen. Both the intervention and control groups underwent the standard blood culture (BC) testing, but additional pathogen identification, based on the results of a LightCycler® SeptiFast PCR test, were provided in the intervention group. RESULTS: The study enrolled 37 patients in the control group and 41 in the intervention group. Baseline clinical and demographic characteristics were similar in both groups. The PCR-based test identified a pathogen in 10 out of 41 (24.4%) patients in the intervention group, with a mean duration from sampling to providing the information to the ICU of 15.9 h. In the control group, BC results were available after a significantly longer period (38.1 h). CONCLUSION: The LightCycler® SeptiFast PCR test demonstrated a significant reduction in the time required for initial pathogen identification, compared with standard BC.
Assuntos
Gastroenteropatias/diagnóstico , Reação em Cadeia da Polimerase Multiplex/métodos , Infecções Respiratórias/diagnóstico , Sepse/diagnóstico , Sepse/microbiologia , Adulto , Técnicas de Tipagem Bacteriana , Cuidados Críticos , Método Duplo-Cego , Gastroenteropatias/microbiologia , Humanos , Técnicas de Diagnóstico Molecular/métodos , Técnicas de Tipagem Micológica , Infecções Respiratórias/microbiologiaRESUMO
We evaluated performances of the molecular test SeptiFast (SF) for the detection of agents of bloodstream infection (BSI) in patients with suspected sepsis, the majority of them under antibiotic treatment and at high prevalence of HIV-1 infection (10.5%). Matched SF and blood culture (BC) samples (n=1186) from 1024 patients were studied. Two hundred fifty-one episodes of BSI out of 1144 were identified with the combined methods (22%). SF identified more episodes of BSI than BC: 206 versus 176 (χ(2)=7.008, P=0.0081) and a significantly higher number of Gram-negative bacteria than BC (77 versus 53, χ(2)=9.12; P=0.0025), as well as of polymicrobial infections (χ(2)=4.50, P=0.0339). In conclusion, SF combined with BC improved the diagnosis of sepsis, especially in immunocompromised patients.
Assuntos
Sangue/microbiologia , Técnicas Microbiológicas/métodos , Técnicas de Diagnóstico Molecular/métodos , Sepse/diagnóstico , Sepse/microbiologia , Adulto , Bactérias/classificação , Bactérias/isolamento & purificação , Fungos/classificação , Fungos/isolamento & purificação , Humanos , Sensibilidade e EspecificidadeRESUMO
Infective endocarditis (IE) is a life-threatening condition, burdened by high mortality. Current guidelines recommend that, in case of negative culture result, tissues from excised heart valves or vegetations from patients with suspected IE should be referred for broad-range bacterial PCR and sequencing. In this proof-of-concept study, the diagnostic utility of the commercially available multiplex real-time PCR system SeptiFast (SF), performed on cardiac valves, was evaluated in a selected population of 20 patients with definite IE of known origin, in comparison with culture. A significant difference was found between SF and culture in the rate of pathogen detection (19 versus 3 respectively; chi-square 14.06; P=0.0002). SF sensitivity was 95%; specificity, 100%; positive predictive value (PPV), 100%; and negative predictive value (NPV), 83.3%. Culture sensitivity was 15%; specificity, 100%; PPV, 100%; and NPV, 22.7%. SF assay, performed on culture-negative excised heart valves, can be useful for the etiological diagnosis of IE.
Assuntos
Endocardite Bacteriana/diagnóstico , Endocardite Bacteriana/microbiologia , Valvas Cardíacas/microbiologia , Reação em Cadeia da Polimerase Multiplex/métodos , Reação em Cadeia da Polimerase em Tempo Real/métodos , Idoso , Estudos de Casos e Controles , Humanos , Pessoa de Meia-Idade , Sensibilidade e EspecificidadeRESUMO
By shortening the time to pathogen identification and allowing for detection of organisms missed by blood culture, new molecular methods may provide clinical benefits for the management of patients with sepsis. While a number of reviews on the diagnosis of sepsis have recently been published we here present up-to-date new developments including multiplex PCR, mass spectrometry and array techniques. We focus on those techniques that are commercially available and for which clinical studies have been performed and published.
RESUMO
BACKGROUND: In critically ill patients with pneumonia, accurate microorganism identification allows appropriate antibiotic treatment. In patients undergoing bronchoalveolar lavage (BAL), direct examination of the fluid using Gram staining provides prompt information but pathogen identification accuracy is low. Culture of BAL fluid is actually the reference, but it is not available before 24 to 48 h. In addition, pathogen identification rate observed with direct examination and culture is decreased when antibiotic therapy has been given prior to sampling. We therefore assessed, in critically ill patients with suspected pneumonia, the performance of a multiplex PCR (MPCR) to identify pathogens in BAL fluid. This study is a prospective pilot observation. METHODS: We used a MPCR detecting 20 types of microorganisms. Direct examination, culture, and MPCR were performed on BAL fluid of critically ill patients with pneumonia suspicion. The final diagnosis of infective pneumonia was retained after the medical chart was reviewed by two experts. Pathogen identification rate of direct examination, culture, and MPCR in patients with confirmed pneumonia was compared. RESULTS: Among the 65 patients with pneumonia suspicion, the diagnosis of pneumonia was finally retained in 53 cases. Twenty nine (55%) were community-acquired pneumonia and 24 (45%) were hospital acquired. Pathogen identification rate with MPCR (66%) was greater than with culture (40%) and direct examination (23%) (p =0.01 and p <0.001, respectively). When considering only the microorganisms included in the MPCR panel, the pathogen identification rate provided by MPCR reached 82% and was still higher than with culture (35%, p <0.001) and direct examination (21%, p <0.001). Pathogen identification rate provided by MPCR was not modified in the case of previous antibiotic treatment (66% vs. 64%, NS) and was still better than with culture (23%, p <0.001). CONCLUSIONS: The results of this pilot study suggest that in critically ill patients, MPCR performed on BAL fluid could provide higher identification rate of pathogens involved in pneumonia than direct examination and culture, especially in patients having received antimicrobial treatment.
RESUMO
Introducción. Evaluamos el nivel de reactantes de fase aguda y la prueba LightCycler® SeptiFast para diferenciar infecciones bacterianas vs.virales. Métodos. Estudio prospectivo en niños febriles. Se analizaron recuento de leucocitos, proteína C-reactiva y procalcitonina en días 1, 3 y 7 de hospitalización. El día 1 se realizaron hemocultivo y radiografía de tórax. Se evaluaron dos grupos de niños que presentaron infecciones bacterianas o virales. Resultados. Se incluyeron 94 niños febriles. La temperatura media de la fiebre fue significativamente más alta en niños con infecciones bacterianas que con infecciones virales (p < 0,001). En 34 (72,3%) niños con infecciones bacterianas, el hemocultivo fue negativo. De ellos, 12 (35,2%) presentaron prueba SeptiFast positiva. No hubo resultados positivos en hemocultivos de niños con infecciones virales y todos tuvieron resultado negativo para la prueba SeptiFast. La media de proteína C-reactiva el primer día de hospitalización fue significativamente más alta en el grupo con infecciones bacterianas (p < 0,001) y en los días 3 y 7 junto con la procalcitonina fueron significativamente más altas en niños con infecciones bacterianas (p <0,001). La sensibilidad y especificidad de los leucocitos, la proteína C-reactiva y la procalcitonina fueron 63,8%, 44,7%, 74,5% y 78,7%, 68,1% y 100%, respectivamente. Las áreas bajo la curva de los leucocitos, la proteína C-reactiva y la procalcitonina fueron 0,519, 0,764 y 0,835, respectivamente. Conclusiones. Los reactantes de fase aguda, en especial procalcitonina, y la prueba LightCycler® SeptiFast podrían ayudar a diferenciar infecciones bacterianas de virales.
Introduction: This study was performed to investigate the value of acute phase reactants and LightCycler® SeptiFast test to differentiate bacterial and viral infections. Population and methods: Children with fever were enrolled to this prospective study. Peripheral white blood cell (WBC), C-reactive protein (CRP) and procalcitonin (PCT) were studied from all patients on day 1, 3 and 7. Blood culture and chest X-ray were also obtained on day 1. Blood samples for LightCycler® SeptiFast test were obtained in all patients to use them if there was uncertain diagnosis between bacterial or viral infection. The patients were divided into two groups as bacterial and viral infection. Results: A total of 94 children with fever were enrolled. The mean value of fever was significantly higher in bacterial group than viral group (p <0.001). In bacterial infection group, 34 (72.3%) patients had negative blood culture. Of those, 12 (35.2%) had positive SeptiFast test. There were no positive blood culture in patients with viral infection group and all of them had negative SeptiFast test. The mean levels of CRP on the first day of admission were significantly higher in bacterial group than viral group (p <0.001). CRP and PCT levels of day 3 and 7 were significantly higher in bacterial group (p <0.001). The sensitivity and specificity levels of WBC, CRP and PCT were 63.8%, 44.7%, 74.5% and 78.7% ,68.1% and 100%, respectively. Conclusions: We found that acute phase reactants, especially PCT, and LightCycler® SeptiFast test may help to differentiate bacterial and viral infections.
Assuntos
Humanos , Masculino , Feminino , Lactente , Pré-Escolar , Criança , Infecções Bacterianas/diagnóstico , Infecções Bacterianas/sangue , Viroses/diagnóstico , Viroses/sangue , Proteínas de Fase Aguda/análise , Reação em Cadeia da Polimerase Multiplex , Estudos Prospectivos , Diagnóstico Diferencial , Reação em Cadeia da Polimerase em Tempo RealRESUMO
Rapid and reliable identification of pathogens is very important in the management of septic patients. We retrospectively evaluated the diagnostic accuracy and clinical utility of a multiplex real-time polymerase chain reaction (PCR) assay (SeptiFast (SF)) in patients with suspected sepsis in a tertiary care hospital in Tallinn, Estonia. A total of 160 blood samples from 144 patients were included in the study. SF results were compared with corresponding blood culture (BC) results. The concordance between SF and BC was 78.8%. The rate of positive results was significantly higher in SF than in BC (33.7% vs. 21.2%, respectively; p < 0.001). A total of 27 samples were found positive by both SF and BC, 27 by SF only, and seven by BC only. Of a total of 83 microorganisms detected SF identified 71, and BC 42 (p < 0.001). SF detected markedly more patients with candidemia: 11 patients were detected by SF compared to four patients by BC. Antimicrobial treatment was changed in 21 (38.9%) of 54 SF positive cases. In conclusion, our results demonstrated the high diagnostic accuracy of SF in detection of sepsis pathogens. In conjunction with its impact on therapeutic decisions, SF proved to be a useful adjunct to conventional blood culture in the diagnosis of sepsis etiology.
RESUMO
Bloodstream infections are a major cause of morbidity and mortality worldwide. Molecular methods for the detection of pathogens in blood have been developed. The clinical utility of these methods and their integration into the clinical workflow is discussed.