Reverse-transcriptase polymerase chain reaction versus chest computed tomography for detecting early symptoms of COVID-19. A diagnostic accuracy systematic review and meta-analysis
São Paulo med. j
;
138(5): 422-432, Sept.-Oct. 2020. tab, graf
Article
in English
| LILACS, SES-SP
| ID: biblio-1139724
ABSTRACT
ABSTRACT BACKGROUND:
A positive real-time reverse-transcriptase polymerase chain reaction (RT-PCR) for SARS CoV-2, from nasopharyngeal swabs, is the current gold standard diagnostic test for this virus and has sensitivity of 60-70%. Some studies have demonstrated a significant number of false-negative RT-PCR tests while displaying significant tomographic findings, in the early days of symptoms of COVID-19.OBJECTIVE:
To compare accuracy between RT-PCR and computed tomography (CT) for detecting COVID-19 in the first week of its symptoms during the pandemic. DESIGN ANDSETTING:
Systematic review of comparative studies of diagnostic accuracy within the Evidence-based Health Program of a federal university in São Paulo (SP), Brazil.METHODS:
A systematic search of the relevant literature was conducted in the PubMed, EMBASE, Cochrane Library, CINAHL and LILACS databases, for articles published up to June 6, 2020, relating to studies evaluating the diagnostic accuracy of RT-PCR and chest CT for COVID-19 diagnoses. The QUADAS 2 tool was used for methodological quality evaluation.RESULTS:
In total, 1204 patients with COVID-19 were evaluated; 1045 had tomographic findings while 755 showed positive RT-PCR for COVID-19. RT-PCR demonstrated 81.4% sensitivity, 100% specificity and 92.3% accuracy. Chest CT demonstrated 95.3% sensitivity, 43.8% specificity and 63.3% accuracy.CONCLUSION:
The high sensitivity and detection rates shown by CT demonstrate that this technique has a high degree of importance in the early stages of the disease. During an outbreak, the higher prevalence of the condition increases the positive predictive value of CT. REGISTRATION NUMBER DOI 10.17605/OSF.IO/UNGHA in the Open Science Framework.
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Pneumonia, Viral
/
Tomography, X-Ray Computed
/
Coronavirus Infections
/
Reverse Transcriptase Polymerase Chain Reaction
Type of study:
Diagnostic study
/
Prognostic study
/
Risk factors
/
Systematic reviews
Limits:
Humans
Country/Region as subject:
South America
/
Brazil
Language:
English
Journal:
São Paulo med. j
Year:
2020
Type:
Article
Institution/Affiliation country:
Universidade Federal de São Paulo/BR
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