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Chest CT may help identify COVID-19 patients with initial negative lab tests
Leesburg, VA - Researchers have found in a new study that Chest CT is important in the screening of patients in whom disease is clinically suspected, especially those who have negative initial RT-PCR results.They further found that the less pulmonary consolidation on chest CT, the greater the possibility of negative initial RT-PCR results.
The findings of the study have been published in an open-access American Journal of Roentgenology (AJR).
One of the major concerns of the COVID-19 spread is asymptomatic silent spreaders. Another concern is the false negative antigen tests which can be troublesome for patients as well as medical professionals.
The researchers conducted a study to evaluate the diagnostic value of chest CT for coronavirus disease (COVID-19) pneumonia--especially for patients with negative initial results of reverse transcription-polymerase chain reaction (RT-PCR)testing.
From January 19 to February 20, 2020, lead investigator Dandan Chen of Guangzhou First People's Hospital in China obtained the admission data of 21 patients (nine men, 12 women; age range, 26-90 years) with confirmed COVID-19 pneumonia from five nonspecialized infectious disease hospitals across Guangzhou.
After undergoing chest CT and swab RT-PCR tests within 3 days, patients were divided into two groups: seven patients with negative initial results (who were found to have positive results after a second RT-PCR test 2 days later) and 14 patients with initial positive results.
"Most of the COVID-19 lesions were located in multiple lobes (67%) in both lungs (72%) in our study," Chen et al. wrote, adding that the CT findings observed most frequently were ground-glass opacities (95%) and consolidation (72%) with subpleural distribution (100%). "Otherwise," they continued, "33% of patients had other lesions around the bronchovascular bundle."
Additional chest CT findings identified by Chen and colleagues included air bronchogram (57%), vascular enlargement (67%), interlobular septal thickening (62%), and pleural effusions (19%).
Ultimately, compared with the positive initial RT-PCR results group, CT of the group with negative initial RT-PCR results was less likely to indicate pulmonary consolidation (p < 0.05).
Acknowledging that RT-PCR detection can be affected by laboratory reagents, test method, and subjective operability, Chen noted that, theoretically, the multicenter nature of this study--five hospitals in four districts of Guangzhou (13 cases in Huadu, four in Baiyun, three in Yuexiu, one in Nansha)--should have reduced interference by such factors.
"When patients with suspected COVID-19 pneumonia who have an epidemiologic history and typical CT features have negative initial RT-PCR results," the authors of this AJR article concluded, "repeated RT-PCR tests and patient isolation should be considered."
For more details click on the link: http://dx.doi.org/10.2214/AJR.20.23012
Hina Zahid Joined Medical Dialogue in 2017 with a passion to work as a Reporter. She coordinates with various national and international journals and association and covers all the stories related to Medical guidelines, Medical Journals, rare medical surgeries as well as all the updates in the medical field. Email:Â editorial@medicaldialogues.in. Contact no. 011-43720751
Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751