Emergency Medical Minute7 Mai 2020

Podcast 560: Imaging in a COVID world

Contributor: Don Stader, MD

Educational Pearls:

COVID-19 commonly appears as a bilateral patchy infiltrate on chest radiograph, but this is a non-specific finding
- Sensitivities range from 17-70% for COVID-19
- Many other viral pneumonias such as RSV and influenza can have similar findings
Point-of-care ultrasound (POCUS) demonstrates B-lines, water-fall sign, or hepatization of the lung, but these are also non-specific
Computerized tomography (CT) appears to be one of the more sensitive tests for detecting COVID-19, demonstrating ground-glass opacities - often before or without the patient having symptoms
- However, routine use of CT for diagnosis COVID-19 is strongly discouraged by many medical societies and the CDC
Imaging may not be necessary in most patients presenting with suspected COVID-19 for multiple reasons:
- Diagnosis is often clinical suspicion, with or without confirmatory PCR testing (if available)
- Imaging does little to change the management in the majority of patients with COVID-19
- Obtaining imaging exposes additional healthcare workers
- Cleaning protocols for units (especially CT) can be extensive and require significant downtime of the machine, thereby leading to delays in care

References

Farkas, Josh. "COVID-19." EMCrit Project, 21 Apr. 2020, emcrit.org/ibcc/covid19/#labs.
Guan W. et al. Clinical Characteristics of Coronavirus Disease 2019 in China. February 28, 2020, updated on March 6, 2020, at NEJM.org. DOI: 10.1056/NEJMoa2002032

Summarized by Jackson Roos, MS4 | Edited by Erik Verzemnieks, MD

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