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[Sorting and detection of COVID-19 by low-dose thoracic CT scan in patients consulting the radiology department of Fann hospital (Dakar-Senegal)]. / Tri et détection du COVID-19 par TDM thoracique low-dose chez des patients tout-venant au service de radiologie de l´hôpital de Fann (Dakar-Sénégal).
Niang, Ibrahima; Diallo, Ibrahima; Diouf, Joseph Coumba Ndoffene; Ly, Mamadou; Toure, Mouhamadou Hamine; Diouf, Khadidiatou Ndiaye; Niang, Fallou Galass; Faye, Ibrahima; Ndao, Mama; Akpo, Geraud; Deme, Hamidou; Diop, Abdoulaye Dione; Ba, Sokhna; Niang, Elhadji.
  • Niang I; Service d´Imagerie Médicale, Centre Hospitalier National Universitaire de Fann, Dakar, Sénégal.
  • Diallo I; Service d´Imagerie Médicale, Centre Hospitalier National Universitaire de Fann, Dakar, Sénégal.
  • Diouf JCN; Service d´Imagerie Médicale, Centre Hospitalier National Universitaire de Fann, Dakar, Sénégal.
  • Ly M; Service d´Imagerie Médicale, Centre Hospitalier National Universitaire de Fann, Dakar, Sénégal.
  • Toure MH; Service d´Imagerie Médicale, Centre Hospitalier National Universitaire de Fann, Dakar, Sénégal.
  • Diouf KN; Service d´Imagerie Médicale, Centre Hospitalier National Universitaire de Fann, Dakar, Sénégal.
  • Niang FG; Service d´Imagerie Médicale, Université Gaston Berger, Saint-Louis, Sénégal.
  • Faye I; Service d´Imagerie Médicale, Centre Hospitalier National Universitaire de Fann, Dakar, Sénégal.
  • Ndao M; Service de Pneumologie, Centre Hospitalier National Universitaire de Fann, Dakar, Sénégal.
  • Akpo G; Service d´Imagerie Médicale, Centre Hospitalier Universitaire Aristide Le Dantec, Dakar, Sénégal.
  • Deme H; Service d´Imagerie Médicale, Centre Hospitalier Universitaire Aristide Le Dantec, Dakar, Sénégal.
  • Diop AD; Service d´Imagerie Médicale, Centre Hospitalier National Universitaire de Fann, Dakar, Sénégal.
  • Ba S; Service d´Imagerie Médicale, Centre Hospitalier National Universitaire de Fann, Dakar, Sénégal.
  • Niang E; Service d´Imagerie Médicale, Centre Hospitalier Universitaire Aristide Le Dantec, Dakar, Sénégal.
Pan Afr Med J ; 37(Suppl 1): 22, 2020.
Article in French | MEDLINE | ID: covidwho-1032976
ABSTRACT

INTRODUCTION:

COVID-19 has spread rapidly since its emergence in China and is currently a global health issue. Its definitive diagnosis is made by PCR on nasopharyngeal swabs. However, this diagnostic test has low sensitivity with delayed results. Hence, thoracic computed tomography represents an interesting alternative. The aims of this study were to assess the frequency of computed tomography (CT) lesions suggestive of COVID-19 and to compare the results of CT and PCR test.

METHODS:

a prospective study carried out over15 working days and involved 47 patients. These patients were recruited based on the presence of at least 2 clinical signs of COVID-19. Chest CT without contrast according to the "LOW-DOSE" protocol was performed. A PCR test on nasopharyngeal swabs was done in patients with signs suggestive of COVID on CT. A serological test was performed in case of a discrepancy between the CT and PCR results.

RESULTS:

thoracic CT was abnormal in 38 patients and normal in 9 patients. Lesions suggestive of COVID-19 have been identified in 32 patients. Two patients had lesions of non-specific pneumonia. Tuberculosis lesions were visualized in 3 patients. One patient had lesions of interstitial pneumonia. The mean DLP was 59 mGy.cm with extremes of 25 and 95 mGy.cm. Ground-glass opacity was present in 100% of COVID-19 suspects on CT. The results of the PCR test were the same than CT in 12 patients. The positive predictive value for CT was 37.5%. In 20 patients with COVID lesions on CT, the PCR test was negative with a false positive rate of 62.5%. In the patients with negative PCR test, 4 had a serological test for COVID-19 and this test was positive in 3.

CONCLUSION:

low-dose chest CT can reduce radiation exposure in COVID-19 patients who are at risk of cumulative dose due to repetitive exam. CT can identify lesions suggestive of COVID-19. It also enables the triage of patients by identifying other diagnoses.
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Full text: Available Collection: International databases Database: MEDLINE Main subject: Tomography, X-Ray Computed / COVID-19 Type of study: Cohort study / Diagnostic study / Observational study / Prognostic study Limits: Adult / Aged / Female / Humans / Male / Middle aged / Young adult Country/Region as subject: Africa Language: French Journal: Pan Afr Med J Year: 2020 Document Type: Article

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Full text: Available Collection: International databases Database: MEDLINE Main subject: Tomography, X-Ray Computed / COVID-19 Type of study: Cohort study / Diagnostic study / Observational study / Prognostic study Limits: Adult / Aged / Female / Humans / Male / Middle aged / Young adult Country/Region as subject: Africa Language: French Journal: Pan Afr Med J Year: 2020 Document Type: Article