How to Predict SARS-COV2 Infection in Patient Admitted in Emergency Department: A Prospective Cohort Study.

Abstract Background. In order to rapidly identifying patients with a low probability of being infected by COVID19 to quickly refer them to specialized departments, the objective of our study was to develop a clinical predictive model of infection by COVID19 in patients attending the ED for respiratory symptoms or unexplained fever.Methods. We included all patients over 15 years old, admitted in one of the 2 emergency departments of Toulouse University Hospital between March 13 and March 31 for respiratory symptoms (dyspnea, cough), or fever (or sensation of fever) of unknown origin, and potentially requiring hospitalization. COVID19 infection was assessed by CT-SCAN and RT-PCR. All the candidate predictors were variables collected during the first clinical examination. Internal validation of the final model was performed using the bootstrap procedure. We performed a temporal validation in the same way on patients included between April 1 and April 13.Results. 772 patients were included. The prevalence of COVID19 was 25.5%. There were 19 predictors in the final model. The corrected-by-optimism area under the curve was 0.86 (95%CI = [0.83;0.89]). For a threshold at 10%, the sensitivity was 92%., the specificity was 56%, and the false negative rate was 5%. In secondary data, including 387 patients, the prevalence of COVID19 was 15%. The area under the curve was 0.73 (95%CI = [0.63;0.83]). For the same threshold, the sensitivity was 78%, the specificity was 48%, and the false negative rate was 7%Conclusion. We have developed a predictive tool of COVID19 infection for patients attending the ED. It could safely reduce admission in COVID19 dedicated unit in ED and prevent its overcrowding.Trial registration number: NCT: RC31/20/0149

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Validation and Optimization of Criteria for Manual Smear Review Following Automated Blood Cell Analysis in a Large University Hospital

Archives of Pathology & Laboratory Medicine ◽

10.5858/arpa.2011-0535-oa ◽

2013 ◽

Vol 137 (3) ◽

pp. 408-414 ◽

Cited By ~ 15

Author(s):

Busadee Pratumvinit ◽

Preechaya Wongkrajang ◽

Kanit Reesukumal ◽

Cherdsak Klinbua ◽

Patama Niamjoy

Keyword(s):

Blood Cell ◽

False Negative ◽

False Negative Rate ◽

University Hospital ◽

Cell Analysis ◽

International Consensus ◽

Negative Rate ◽

Consensus Group ◽

Positive Smear ◽

First Time

Context.—Each laboratory should have criteria for manual smear review that limit workload without affecting patient care. The International Consensus Group for Hematology Review established guidelines for action after automated blood cell analysis in 2005. Objective.—To compare the consensus group criteria with our laboratory criteria and optimize them for better efficiency. Design.—A total of 2114 first-time samples were collected consecutively from daily workload and were used to compare 2 criteria as well as establish the optimized criteria. Another set of 891 samples was used to validate the optimized criteria. All samples were run on either Sysmex XE-5000 or Coulter LH750 hematology analyzers and were investigated by manual smear review. The efficiency of each set of criteria was compared and optimized to obtain better efficiency, an acceptable review rate, and a low false-negative rate. Results.—From 2114 samples, 368 (17.40%) had positive smear results. Compared with that of our laboratory criteria, the efficiency of the consensus group criteria was higher (83.63% versus 78.86%, P < .001), the review rate was higher (29.33% versus 22.37%, P < .001), and the false-negative rate was lower (2.22% versus 8.09%, P < .001). After optimizing the rules, we obtained an efficiency of 87.13%, a review rate of 24.22%, and a false-negative rate of 2.98%. We validated the optimized criteria with another set of samples, and the efficiency, review rate, and false-negative rate were 87.32%, 25.25%, and 1.12%, respectively. Conclusions.—Each laboratory should verify the criteria for smear review, based on the International Consensus Group for Hematology Review, and optimize them to maximize efficiency.

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Does the false‐negative rate for 1 or 2 negative sentinel nodes after neo‐adjuvant chemotherapy translate into a high local recurrence rate?

The Breast Journal ◽

10.1111/tbj.14206 ◽

2021 ◽

Author(s):

Nicole E. Sharp ◽

Darren B. Sachs ◽

Nicole M. Melchior ◽

Philip Albaneze ◽

Salvatore Nardello ◽

...

Keyword(s):

Adjuvant Chemotherapy ◽

Local Recurrence ◽

Recurrence Rate ◽

Local Recurrence Rate ◽

False Negative ◽

False Negative Rate ◽

Sentinel Nodes ◽

Negative Rate ◽

High Local Recurrence Rate ◽

Neo Adjuvant Chemotherapy

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Effects of Previous Surgery on the Detection of Sentinel Nodes in Women With Vulvar Cancer

International Journal of Gynecological Cancer ◽

10.1097/igc.0b013e31822dbe3c ◽

2011 ◽

Vol 21 (9) ◽

pp. 1679-1683 ◽

Cited By ~ 10

Author(s):

Tessa A. Ennik ◽

David G. Allen ◽

Ruud L.M. Bekkers ◽

Simon E. Hyde ◽

Peter T. Grant

Keyword(s):

Vulvar Cancer ◽

False Negative ◽

False Negative Rate ◽

Blue Dye ◽

Previous Surgery ◽

Detection Rates ◽

Reliable Technique ◽

Appearance Time ◽

Negative Rate ◽

Significant Difference

BackgroundThere is a growing interest to apply the sentinel node (SN) procedure in the treatment of vulvar cancer. Previous vulvar surgery might disrupt lymphatic patterns and thereby decrease SN detection rates, lengthen scintigraphic appearance time (SAT), and increase SN false-negative rate. The aims of this study were to evaluate the SN detection rates at the Mercy Hospital for Women in Melbourne and to investigate whether previous vulvar surgery affects SN detection rates, SAT, and SN false-negative rate.MethodsData on all patients with vulvar cancer who underwent an SN procedure (blue dye, technetium, or combined technique) from November 2000 to July 2010 were retrospectively collected.ResultsSixty-five SN procedures were performed. Overall detection rate was 94% per person and 80% per groin. Detection rates in the group of patients who underwent previous excision of the primary tumor were not lower compared with the group without previous surgery or with just an incisional biopsy. There was no statistical significant difference in SAT between the previous excision group and the other patients. None of the patients with a false-negative SN had undergone previous excision.ConclusionsResults indicate that previous excision of a primary vulvar malignancy does not decrease SN detection rates or increase SN false-negative rate. Therefore, the SN procedure appears to be a reliable technique in patients who have previously undergone vulvar surgery. Previous excision did not significantly lengthen SAT, but the sample size in this subgroup analysis was small.

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Temporal dynamics of viral load and false negative rate influence the levels of testing necessary to combat COVID-19 spread

Scientific Reports ◽

10.1038/s41598-021-88498-9 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Katherine F. Jarvis ◽

Joshua B. Kelley

Keyword(s):

Viral Load ◽

Temporal Dynamics ◽

Reproduction Number ◽

False Negative ◽

False Negative Rate ◽

Agent Based Model ◽

Agent Based ◽

Viral Spread ◽

Negative Rate

AbstractColleges and other organizations are considering testing plans to return to operation as the COVID-19 pandemic continues. Pre-symptomatic spread and high false negative rates for testing may make it difficult to stop viral spread. Here, we develop a stochastic agent-based model of COVID-19 in a university sized population, considering the dynamics of both viral load and false negative rate of tests on the ability of testing to combat viral spread. Reported dynamics of SARS-CoV-2 can lead to an apparent false negative rate from ~ 17 to ~ 48%. Nonuniform distributions of viral load and false negative rate lead to higher requirements for frequency and fraction of population tested in order to bring the apparent Reproduction number (Rt) below 1. Thus, it is important to consider non-uniform dynamics of viral spread and false negative rate in order to model effective testing plans.

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High mortality with High false negative rate: COVID-19 infection in patients with hematologic malignancies

Leukemia Research ◽

10.1016/j.leukres.2021.106582 ◽

2021 ◽

Vol 106 ◽

pp. 106582

Author(s):

Alex Niu ◽

Bo Ning ◽

Francisco Socola ◽

Hana Safah ◽

Tim Reynolds ◽

...

Keyword(s):

High Mortality ◽

False Negative ◽

False Negative Rate ◽

Hematologic Malignancies ◽

Negative Rate ◽

High False Negative Rate

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489 The Role of Sentinel Lymph Node Biopsy in Cutaneous Head and Neck Melanoma: A Systematic Review and Meta-Analysis

British Journal of Surgery ◽

10.1093/bjs/znab134.289 ◽

2021 ◽

Vol 108 (Supplement_2) ◽

Author(s):

E Johnston ◽

S Taylor ◽

F Bannon ◽

S McAllister

Keyword(s):

Lymph Node ◽

Sentinel Lymph Node ◽

Sentinel Lymph Node Biopsy ◽

Head And Neck ◽

False Negative ◽

False Negative Rate ◽

Lymph Node Biopsy ◽

Node Biopsy ◽

Negative Rate ◽

Sentinel Node Identification

Abstract Introduction and Aims The aim of this systematic review is to provide an up-to-date evaluation of the role and test performance of sentinel lymph node biopsy (SLNB) in the head and neck. Method This review follows the PRISMA guidelines. Database searches for MEDLINE and EMBASE were constructed to retrieve human studies published between 1st January 2010 and 1st July 2020 assessing the role and accuracy of sentinel lymph node biopsy in cutaneous malignant melanoma of the head and neck. Articles were independently screened by two reviewers and critically appraised using the MINORS criteria. The primary outcomes consisted of the sentinel node identification rate and test-performance measures, including the false-negative rate and the posttest probability negative. Results A total of 27 studies, including 4688 patients, met the eligibility criteria. Statistical analysis produced weighted summary estimates for the sentinel node identification rate of 97.3% (95% CI, 95.9% to 98.6%), the false-negative rate of 21.3% (95% CI, 17.0% to 25.4%) and the posttest probability negative of 4.8% (95% CI, 3.9% to 5.8%). Discussion Sentinel lymph node biopsy is accurate and feasible in the head and neck. Despite technical improvements in localisation techniques, the false negative rate remains disproportionately higher than for melanoma in other anatomical sites.

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Assessment of Lymph Node Involvement with PET-CT in Advanced Epithelial Ovarian Cancer. A FRANCOGYN Group Study

Journal of Clinical Medicine ◽

10.3390/jcm10040602 ◽

2021 ◽

Vol 10 (4) ◽

pp. 602

Author(s):

Antoine Tardieu ◽

Lobna Ouldamer ◽

François Margueritte ◽

Lauranne Rossard ◽

Aymeline Lacorre ◽

...

Keyword(s):

Lymph Node ◽

False Negative ◽

False Negative Rate ◽

Lymph Node Involvement ◽

Accuracy Rate ◽

Peritoneal Cancer ◽

Negative Rate ◽

Number Of Patients ◽

Pet Ct ◽

Node Involvement

The objective of our study is to evaluate the diagnostic performance of positron emission tomography/computed tomography (PET-CT) for the assessment of lymph node involvement in advanced epithelial ovarian, fallopian tubal or peritoneal cancer (EOC). This was a retrospective, bicentric study. We included all patients over 18 years of age with a histological diagnosis of advanced EOC who had undergone PET-CT at the time of diagnosis or prior to cytoreduction surgery with pelvic or para-aortic lymphadenectomy. We included 145 patients with primary advanced EOC. The performance of PET-CT was calculated from the data of 63 patients. The sensitivity of PET-CT for preoperative lymph node evaluation was 26.7%, specificity was 90.9%, PPV was 72.7%, and NPV was 57.7%. The accuracy rate was 60.3%, and the false-negative rate was 34.9%. In the case of primary cytoreduction (n = 16), the sensitivity of PET-CT was 50%, specificity was 87.5%, PPV was 80%, and NPV was 63.6%. The accuracy rate was 68.8%, and the false negative rate was 25%. After neoadjuvant chemotherapy (n = 47), the sensitivity of PET-CT was 18.2%, specificity was 92%, PPV was 66.7%, and NPV was 56.1%. The accuracy rate was 57.5%, and the false negative rate was 38.3%. Due to its high specificity, the performance of a preoperative PET-CT scan could contribute to the de-escalation and reduction of lymphadenectomy in the surgical management of advanced EOC in a significant number of patients free of lymph node metastases.

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Diagnostic Accuracy of Magnetic Resonance Imaging and Computed Tomography Scan in Young Athletes With Spondylolysis

Clinical Pediatrics ◽

10.1177/0009922819832643 ◽

2019 ◽

Vol 58 (6) ◽

pp. 671-676

Author(s):

Amy M. West ◽

Pierre A. d’Hemecourt ◽

Olivia J. Bono ◽

Lyle J. Micheli ◽

Dai Sugimoto

Keyword(s):

Magnetic Resonance Imaging ◽

Computed Tomography ◽

Magnetic Resonance ◽

Ct Scan ◽

False Negative ◽

False Negative Rate ◽

Ct Scans ◽

Resonance Imaging ◽

Young Athletes ◽

Negative Rate

The objective of this study was to determine diagnostic accuracy of magnetic resonance imaging (MRI) and computed tomography (CT) scans in young athletes diagnosed with spondylolysis. A cross-sectional study was used. Twenty-two young athletes (14.7 ± 1.5 years) were diagnosed as spondylolysis based on a single-photon emission CT. Following the diagnosis, participants underwent MRI and CT scan imaging tests on the same day. The sensitivity and false-negative rate of the MRI and CT scans were analyzed. MRI test confirmed 13 (+) and 9 (−) results while CT test showed 17 (+) and 5 (−) results. The sensitivity and false-negative rate of MRI were, respectively, 59.1% (95% confidence interval [CI] = 36.7% to 78.5%) and 40.9% (95% CI = 21.5% to 63.3%). Furthermore, the sensitivity and false-negative rate of CT scan were 77.3% (95% CI = 54.2% to 91.3%) and 22.7% (95% CI = 0.09% to 45.8%). Our results indicated that CT scan is a more accurate imaging modality to diagnose spondylolysis compared with MRI in young athletes.

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