Rapid antigen-based and rapid molecular tests for the detection of SARS-CoV-2: a rapid review with network meta-analysis of diagnostic test accuracy studies

BACKGROUND

The global spread of COVID-19 created an explosion in rapid tests with results in < 1 hour, but their relative performance characteristics are not fully understood yet. Our aim was to determine the most sensitive and specific rapid test for the diagnosis of SARS-CoV-2.

METHODS

Design: Rapid review and diagnostic test accuracy network meta-analysis (DTA-NMA).

ELIGIBILITY CRITERIA

Randomized controlled trials (RCTs) and observational studies assessing rapid antigen and/or rapid molecular test(s) to detect SARS-CoV-2 in participants of any age, suspected or not with SARS-CoV-2 infection.

INFORMATION SOURCES

Embase, MEDLINE, and Cochrane Central Register of Controlled Trials, up to September 12, 2021.

OUTCOME MEASURES

Sensitivity and specificity of rapid antigen and molecular tests suitable for detecting SARS-CoV-2. Data extraction and risk of bias assessment: Screening of literature search results was conducted by one reviewer; data abstraction was completed by one reviewer and independently verified by a second reviewer. Risk of bias was not assessed in the included studies.

DATA SYNTHESIS

Random-effects meta-analysis and DTA-NMA.

RESULTS

We included 93 studies (reported in 88 articles) relating to 36 rapid antigen tests in 104,961 participants and 23 rapid molecular tests in 10,449 participants. Overall, rapid antigen tests had a sensitivity of 0.75 (95% confidence interval 0.70-0.79) and specificity of 0.99 (0.98-0.99). Rapid antigen test sensitivity was higher when nasal or combined samples (e.g., combinations of nose, throat, mouth, or saliva samples) were used, but lower when nasopharyngeal samples were used, and in those classified as asymptomatic at the time of testing. Rapid molecular tests may result in fewer false negatives than rapid antigen tests (sensitivity: 0.93, 0.88-0.96; specificity: 0.98, 0.97-0.99). The tests with the highest sensitivity and specificity estimates were the Xpert Xpress rapid molecular test by Cepheid (sensitivity: 0.99, 0.83-1.00; specificity: 0.97, 0.69-1.00) among the 23 commercial rapid molecular tests and the COVID-VIRO test by AAZ-LMB (sensitivity: 0.93, 0.48-0.99; specificity: 0.98, 0.44-1.00) among the 36 rapid antigen tests we examined.

CONCLUSIONS

Rapid molecular tests were associated with both high sensitivity and specificity, while rapid antigen tests were mainly associated with high specificity, according to the minimum performance requirements by WHO and Health Canada. Our rapid review was limited to English, peer-reviewed published results of commercial tests, and study risk of bias was not assessed. A full systematic review is required.

REVIEW REGISTRATION

PROSPERO CRD42021289712.

Balancing quality improvement and unintended effects: The impact of implementing admission order sets for chronic obstructive pulmonary disease and heart failure at two teaching hospitals

RATIONALE, AIMS, AND OBJECTIVES

Local health administrators implemented chronic obstructive pulmonary disease and heart failure admission order sets to increase guideline adherence. We explored the impact of these order sets on workflows and guideline adherence in the internal medicine specialty in two Canadian teaching hospitals.

METHODS

A mixed methods study combined shadowing care providers (250 h), meeting observation and interviews (11 h), and patient medical chart audits for heart failure (n = 120) and chronic obstructive pulmonary disease (n = 120) patients. The chart audits analysed details of the admission process and 14 guideline elements associated with heart failure (nine) and chronic obstructive pulmonary disease (five).

RESULTS

A subset (10/14) of the evaluated guideline elements were included in the heart failure or chronic obstructive pulmonary disease order sets. Order set use significantly increased adherence to some (4/10) of these elements. However, our qualitative work uncovered a perception that use of these two order sets increased order duplication. Our chart audits supported this perception. Order set use increased order duplication for heart failure (92% vs 43%) and chronic obstructive pulmonary disease (75% vs 43%).

CONCLUSION

It is unclear whether, for these two hospitals, the gains brought by implementation of chronic obstructive pulmonary disease and heart failure admission order sets were worth their associated organisational shortcomings. Problems with order set implementation appeared to stem from poor integration with pre-existing complex organisational systems. Health administrators and clinicians interested in implementing order sets within their own hospitals need to remain cognizant of how these tools will fit into existing systems and practices.

Exploring How Evidence is Used in Care Through an Organizational Ethnography of Two Teaching Hospitals

Background

Numerous published articles show that clinicians do not follow clinical practice guidelines (CPGs). However, a few studies explore what clinicians consider evidence and how they use different forms of evidence in their care decisions. Many of these existing studies occurred before the advent of smartphones and advanced Web-based information retrieval technologies. It is important to understand how these new technologies influence the ways clinicians use evidence in their clinical practice. Mindlines are a concept that explores how clinicians draw on different sources of information (including context, experience, medical training, and evidence) to develop collectively reinforced, internalized tacit guidelines.

Objective

The aim of this paper was to explore how evidence is integrated into mindline development and the everyday use of mindlines and evidence in care.

Methods

We draw on ethnographic data collected by shadowing internal medicine teams at 2 teaching hospitals. Fieldnotes were tagged by evidence category, teaching and care, and role of the person referencing evidence. Counts of these tags were integrated with fieldnote vignettes and memos. The findings were verified with an advisory council and through member checks.

Results

CPGs represent just one of several sources of evidence used when making care decisions. Some forms of evidence were predominately invoked from mindlines, whereas other forms were read to supplement mindlines. The majority of scientific evidence was accessed on the Web, often through smartphones. How evidence was used varied by role. As team members gained experience, they increasingly incorporated evidence into their mindlines. Evidence was often blended together to arrive at shared understandings and approaches to patient care that included ways to filter evidence.

Conclusions

This paper outlines one way through which the ethos of evidence-based medicine has been incorporated into the daily work of care. Here, multiple Web-based forms of evidence were mixed with other information. This is different from the way that is often articulated by health administrators and policy makers whereby clinical practice guideline adherence is equated with practicing evidence-based medicine.

[Venezuelan consensus guidelines on the use of magnetic resonance in diagnosis and follow up of patients with multiple sclerosis]

INTRODUCTION

The clinical use of magnetic resonance (MR) in patients with multiple sclerosis (MS) has advanced markedly over the past few years. Several groups around the world have developed consensus guidelines about the role of MR in MS at diagnosis and during follow up. However, in some regions is difficult to extrapolate the recommendations.

AIM

To provide recommendations for the implementation of MR in MS patients at diagnosis and follow up in Venezuela.

DEVELOPMENT

A group of experts from Venezuela that included neurologists and radiologists, by using the online surveys methodology as well as face to face meetings developed the intended consensus for the use of MR during the diagnosis and follow up of MS patients in Venezuela. Seventeen recommendations were established based on published evidence and the expert opinion. Recommendations focused on the role of conventional MR techniques and brain atrophy measurement in MS patients both at diagnosis and during follow-up.

CONCLUSIONS

The recommendations of this consensus guidelines attempts to optimize the health care and management of patients with MS in Venezuela.

Noninvasive measurement of dissipation in colloidal systems

According to Harada and Sasa [Phys. Rev. Lett. 95, 130602 (2005)], heat production generated in a nonequilibrium steady state can be inferred from measuring response and correlation functions. In many colloidal systems, however, it is a nontrivial task to determine response functions, whereas details about spatial steady state trajectories are easily accessible. Using a simple conditional averaging procedure, we show how this fact can be exploited to reliably evaluate average heat production. We test this method using Brownian dynamics simulations, and apply it to experimental data of an interacting driven colloidal system.

Role of hidden slow degrees of freedom in the fluctuation theorem

The validity of the fluctuation theorem for entropy production as deduced from the observation of trajectories implicitly requires that all slow degrees of freedom are accessible. We experimentally investigate the role of hidden slow degrees of freedom in a system of two magnetically coupled driven colloidal particles. The apparent entropy production based on the observation of just one particle obeys a fluctuation theorem-like symmetry with a slope of 1 in the short time limit. For longer times, we find a constant slope, but different from 1. We present theoretical arguments for a generic linear behavior both for small and large apparent entropy production but not necessarily throughout. By fine-tuning experimental parameters, such an intermediate nonlinear behavior can indeed be recovered in our system as well.

Clinician-scientists in Canada: barriers to career entry and progress

Background

Clinician-scientists play an important role in translating between research and clinical practice. Significant concerns about a decline in their numbers have been raised. Potential barriers for career entry and progress are explored in this study.

Methods

Case-study research methods were used to identify barriers perceived by clinician-scientists and their research teams in two Canadian laboratories. These perceptions were then compared against statistical analysis of data from Canadian Institutes of Health Research (CIHR) databases on grant and award performance of clinician-scientists and non-clinical PhDs for fiscal years 2000 to 2008.

Results

Three main barriers were identified through qualitative analysis: research training, research salaries, and research grants. We then looked for evidence of these barriers in the Canada-wide statistical dataset for our study period. Clinician-scientists had a small but statistically significant higher mean number of degrees (3.3) than non-clinical scientists (3.2), potentially confirming the perception of longer training times. But evidence of the other two barriers was equivocal. For example, while overall growth in salary awards was minimal, awards to clinician-scientists increased by 45% compared to 6.3% for non-clinical PhDs. Similarly, in terms of research funding, awards to clinician-scientists increased by more than 25% compared with 5% for non-clinical PhDs. However, clinician-scientist-led grants funded under CIHR's Clinical thematic area decreased significantly from 61% to 51% (p-value<0.001) suggesting that clinician-scientists may be shifting their attention to other research domains.

Conclusion

While clinician-scientists continue to perceive barriers to career entry and progress, quantitative results suggest improvements over the last decade. Clinician-scientists are awarded an increasing proportion of CIHR research grants and salary awards. Given the translational importance of this group, however, it may be prudent to adopt specific policy and funding incentives to ensure the ongoing viability of the career path.

Harnessing stem cells for health needs in India

While industrialized countries' stem cell research will be transferable to the developing world, research conducted by developing countries offers the potential to target innovation to local context, make treatments more affordable, and aid in economic development. India demonstrates that stem cell research and development (R&D) is not confined to industrialized countries and has begun to harness stem cells to address its own health needs.

[Complications of laparoscopic cholecystectomy]

The laparoscopy cholecistectomy is a surgical procedure described in 1987, and it has had an important apogee and it's had substitute to open procedure. Between its advantages is notable, the postoperatory evolution without pain, paralytic ileus and the short time of hospitalization besides the patient can go away the same day in some cases. In Venezuela, the procedure has been received with enthusiasm by the surgeons with prefer this procedure however, there are complications derived in part for the lack of experience in the first cases, but occur non related of the experience. The quantization of the complications is not simple to realize for different reasons. We present twelve complications, two belong to patients intervened in the Hospital Universitario de Caracas and ten belong to patient transferred from other center. The complications were: pseudoaneurism of hepatic artery, hematoma of the wall, cutting of common bile duct, section the right bile duct, abscess of vesicular bed in two cases, retropneumoperitoneum, ascites by biliary fistula and four biloma. The treatment varied in every case and the utilization of radiologic technique with percutaneous drainage were useful in five cases. We conclude: first, this technique is not free of complications. Second, the percutaneous drainage (abscess, biloma), endoscopic procedure (biliary prosthesis) in fistulaes and arteriographics (arterial embolization), are useful in some cases, and could prevent the surgical reintervention.

[Potassium-dependent modification of the lidocaine effect: an experimental investigation (author's transl)]

Lidocaine was supplied to 10 cats by 2 comparative infusions of 7.5 mg/kg respectively. Once the drug was dissolved in a physiological and the other time in a K-Mg-concentrated electrolyte solution. The sequence of both infusions alternated. Serum potassium remained constant during infusion of the physiological electrolyte solution, but increased by about 1 mEqu/1 under K-concentrated solution. Lidocaine caused an enhancement of ventricular fibrillation threshold to an absolutely identical degree in both groups. Increase in cardiac output and stroke volume and decrease of sinus rate was significant in both groups, but more pronounced under K-Mg concentrated solution. Mean arterial pressure, peripheral vascular resistance, PQ, QRS, and QT interval remained constant on the whole. We deduce from these results for antiarrhythmic therapy on normokalemic patients, that the addition of potassium and magnesium to lidocaine solution does not enhance its antifibrillatory effect. This statement is valid for doses up to 20 mEqu/h of magnesium and 40 mEqu/h of potassium.