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COVID-19: Potential Workflows and Telemedicine

Marco Torres |

The Novel Coronavirus 2019, was first reported on in Wuhan, China in late December 2019.  The outbreak was declared a public health emergency of international concern in January 2020 and on March 11th, 2020, the outbreak was declared a global pandemic.  The spread of this virus is now global with lots of media attention.  The virus has been named SARS-CoV-2 and the disease it causes has become known as coronavirus disease 2019 (COVID-19).  This new outbreak has been producing lots of hysteria and false truths being spread, however the data surrounding the biology, epidemiology, and clinical characteristics are growing daily, making this a moving target.  This post will serve as a summary of potential workflows and telemedicine screening for COVID-19. 

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Potential Workflow for COVID-19 Patients (March 20th, 2020):

  • Thank you to Anand Swaminathan, MD (Twitter: @EMSwami) and Josh Farkas, MD (Twitter: @PulmCrit) for their input on this
  • None of our current diagnostic tools are great, and until we have a RT-PCR assay that has a rapid turnaround time (currently 1 – 7d) and availability (we simply don’t have enough tests to test everyone) this seems to be what makes the most sense
  • CT chest and Lung US are faster than RT-PCR in terms of turnaround time, therefore in the sickest patients (i.e. requiring hospitalization, ICU admit, PNA, ARDS) this seems to be the best 1st step (i.e. This is not for all patients)
  • One obvious drawback of using the CT scanner is this will be the potential to contaminate the CT scanner
  • Patients with negative flu swab, viral panel swabs, CXR and mild disease (i.e. none of the sickest patients from above) can most likely be diagnosed with presumed COVID-19 as they won’t really require any specific in-hospital treatment and be discharged home with specific self isolation instructions (i.e. we already do this for influenza)
  • Patients with positive flu swab, viral panel swabs, and mild disease can most likely be diagnosed with a viral infection, but due to the rate of co-infection, COVID-19 is possible

  • One effective strategy that has been used during the COVID-19 epidemic in China is the use of fever clinics.  An extrapolation of this might be tents outside the hospital.  Attached is the workflow that is being used. [24] Interestingly, absolute lymphocyte count and CT scan is part of their algorithm.

Flow Diagram for Evaluation of a Potential COVID-19 Patient Under Investigation (PUI) at my Home Institution (Last Updated Mar 20th, 2020)

Telemedicine COVID19 Screening Algorithm Used at my Home Institution (Last Updated March 17th, 2020)

Roth Index to Assess O2 saturation (on room air)[1]

  • What They Did:
    • Prospective, controlled-cohort study
    • Patients admitted to internal medicine service or cardiac ICU in Israel
    • Included: Pulse oximetry on room air requiring 2L to 6L NC O2 to maintain O2 saturation >92%
    • Excluded: Hypoxia requiring advanced noninvasive or invasive oxygenation
    • Control group: 103 Healthy volunteers
  • Roth Score:
    • Have patient take a deep breath in and count out loud from 1 to 30 in their native language, in a single breath, as rapidly as possible
    • Primary result:
      • Duration of time elapsed between counting from 1 to 30 in 1 breath OR until patient took another breath
      • Highest number reached in 1 breath (measured with stopwatch in seconds from 1 to highest number reached)
    • Languages evaluated: Hebrew, Arabic, Russian, French, and English
  • Results:
    • Most common admission diagnoses: CHF (25%), PNA (17%), and ACS (15%)
    • Strong positive correlation between pulse oximetry and both:
      • Maximal count achieved in 1 breath: r = 0.67; P < 0.001
      • Counting time: r = 0.59; p <0.001
    • All healthy volunteers counted to at least 15 in 1 breath and 97 (94%) counted to at least 20
    • Constructed ROC curve with room air saturation as primary variable:
      • Identifying O2 sat <95% (on room air)
        • ROC curve for max count number: 0.828
        • ROC curve for counting time: 0.764
      • Identifying O2 sat <90% (on room air)
        • ROC curve for max count number: 0.843
        • ROC curve for counting time: 0.812

  • Limitations:
    • Test is patient effort-dependent
    • Hypoxia is only one element of dyspnea
    • Tool has not been validated
    • This tool is not intended to replace more advanced testing in diagnosing respiratory distress or etiology of dyspnea
  • Bottom Line: In a setting of increased demand with resource scarcity telemedicine is an option, as it is cost effective and resource-sparing and although the Roth Score still needs to be validated, it may be one option to determine patients oxygen saturation

References:

  1. Chorin E et al. Assessment of Respiratory Distress by the Roth Score. Clin Cardiol 2016. PMID: 27701750

For More Thoughts on This Topic Checkout:

Post Peer Reviewed By: Anand Swaminathan, MD (Twitter: @EMSwami) and Mizuho Morrison, DO (Twitter: mizuhomorrison)

The post COVID-19: Potential Workflows and Telemedicine appeared first on REBEL EM - Emergency Medicine Blog.

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