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Excess Out-of-Hospital Mortality and Declining Oxygen Saturation: The Sentinel Role of Emergency Medical Services Data in the COVID-19 Crisis in Tijuana, Mexico.
Ann Emerg Med. 2020 10; 76(4):413-426.AE

Abstract

STUDY OBJECTIVE

Emergency medical services (EMS) may serve as a key source of real-time data about the evolving health of coronavirus disease 2019 (COVID-19)-affected populations, especially in low- and middle-income countries with less rapid and reliable vital statistics registration systems. Although official COVID-19 statistics in Mexico report almost exclusively inhospital mortality events, excess out-of-hospital mortality has been identified in other countries, including 1 EMS study in Italy that showed a 58% increase. Additionally, EMS and hospital reports from several countries have suggested that silent hypoxemia-low Spo2 in the absence of dyspnea-is associated with COVID-19. It is unclear, however, how these phenomena can be generalized to low- and middle-income countries. We assess how EMS data can be used in a sentinel capacity in Tijuana, a city on the Mexico-United States border with earlier exposure to COVID-19 than many low- and middle-income country settings.

METHODS

In this observational study, we calculated numbers of weekly out-of-hospital deaths and respiratory cases handled by EMS in Tijuana, and estimated the difference between peak epidemic rates and expected trends based on data from 2014 to 2019. Results were compared with official COVID-19 statistics, stratified by neighborhood socioeconomic status, and examined for changing demographic or clinical features, including mean Spo2.

RESULTS

An estimated 194.7 excess out-of-hospital deaths (95% confidence interval 135.5 to 253.9 deaths) occurred during the peak window (April 14 to May 11), representing an increase of 145% (95% CI 70% to 338%) compared with expected levels. During the same window, only 5 COVID-19-related out-of-hospital deaths were reported in official statistics. This corresponded with an increase in respiratory cases of 236.5% (95% CI 100.7% to 940.0%) and a decrease in mean Spo2 to 77.7% from 90.2% at baseline. The highest out-of-hospital death rates were observed in low-socioeconomic-status areas, although respiratory cases were more concentrated in high-socioeconomic-status areas.

CONCLUSION

EMS systems may play an important sentinel role in monitoring excess out-of-hospital mortality and other trends during the COVID-19 crisis in low- and middle-income countries. Using EMS data, we observed increases in out-of-hospital deaths in Tijuana that were nearly 3-fold greater than increases reported in EMS data in Italy. Increased testing in out-of-hospital settings may be required to determine whether excess mortality is being driven by COVID-19 infection, health system saturation, or patient avoidance of health care. We also found evidence of worsening rates of hypoxemia among respiratory patients treated by EMS, suggesting a possible increase in silent hypoxemia, which should be met with increased detection and clinical management efforts. Finally, we observed social disparities in out-of-hospital death that warrant monitoring and amelioration.

Authors+Show Affiliations

Center for Social Medicine, University of California, Los Angeles, Los Angeles, CA.Academia Mexicana de la Salud, Tijuana, Mexico.El Colegio de la Frontera Norte, Tijuana, Mexico.Mexican Red Cross, Tijuana, Mexico; Facultad de Medicina y Psicología, Universidad Autónoma de Baja California.Department of Emergency Medicine, University of California, Los Angeles, Los Angeles, CA.Mexican Red Cross, Tijuana, Mexico; Department of Emergency Medicine, University of California, Riverside, Riverside, CA. Electronic address: evatovarhi@gmail.com.

Pub Type(s)

Journal Article
Observational Study
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

33012377

Citation

Friedman, Joseph, et al. "Excess Out-of-Hospital Mortality and Declining Oxygen Saturation: the Sentinel Role of Emergency Medical Services Data in the COVID-19 Crisis in Tijuana, Mexico." Annals of Emergency Medicine, vol. 76, no. 4, 2020, pp. 413-426.
Friedman J, Calderón-Villarreal A, Bojorquez I, et al. Excess Out-of-Hospital Mortality and Declining Oxygen Saturation: The Sentinel Role of Emergency Medical Services Data in the COVID-19 Crisis in Tijuana, Mexico. Ann Emerg Med. 2020;76(4):413-426.
Friedman, J., Calderón-Villarreal, A., Bojorquez, I., Vera Hernández, C., Schriger, D. L., & Tovar Hirashima, E. (2020). Excess Out-of-Hospital Mortality and Declining Oxygen Saturation: The Sentinel Role of Emergency Medical Services Data in the COVID-19 Crisis in Tijuana, Mexico. Annals of Emergency Medicine, 76(4), 413-426. https://doi.org/10.1016/j.annemergmed.2020.07.035
Friedman J, et al. Excess Out-of-Hospital Mortality and Declining Oxygen Saturation: the Sentinel Role of Emergency Medical Services Data in the COVID-19 Crisis in Tijuana, Mexico. Ann Emerg Med. 2020;76(4):413-426. PubMed PMID: 33012377.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Excess Out-of-Hospital Mortality and Declining Oxygen Saturation: The Sentinel Role of Emergency Medical Services Data in the COVID-19 Crisis in Tijuana, Mexico. AU - Friedman,Joseph, AU - Calderón-Villarreal,Alhelí, AU - Bojorquez,Ietza, AU - Vera Hernández,Carlos, AU - Schriger,David L, AU - Tovar Hirashima,Eva, Y1 - 2020/07/23/ PY - 2020/05/18/received PY - 2020/07/17/revised PY - 2020/07/21/accepted PY - 2020/10/5/entrez PY - 2020/10/6/pubmed PY - 2020/10/21/medline SP - 413 EP - 426 JF - Annals of emergency medicine JO - Ann Emerg Med VL - 76 IS - 4 N2 - STUDY OBJECTIVE: Emergency medical services (EMS) may serve as a key source of real-time data about the evolving health of coronavirus disease 2019 (COVID-19)-affected populations, especially in low- and middle-income countries with less rapid and reliable vital statistics registration systems. Although official COVID-19 statistics in Mexico report almost exclusively inhospital mortality events, excess out-of-hospital mortality has been identified in other countries, including 1 EMS study in Italy that showed a 58% increase. Additionally, EMS and hospital reports from several countries have suggested that silent hypoxemia-low Spo2 in the absence of dyspnea-is associated with COVID-19. It is unclear, however, how these phenomena can be generalized to low- and middle-income countries. We assess how EMS data can be used in a sentinel capacity in Tijuana, a city on the Mexico-United States border with earlier exposure to COVID-19 than many low- and middle-income country settings. METHODS: In this observational study, we calculated numbers of weekly out-of-hospital deaths and respiratory cases handled by EMS in Tijuana, and estimated the difference between peak epidemic rates and expected trends based on data from 2014 to 2019. Results were compared with official COVID-19 statistics, stratified by neighborhood socioeconomic status, and examined for changing demographic or clinical features, including mean Spo2. RESULTS: An estimated 194.7 excess out-of-hospital deaths (95% confidence interval 135.5 to 253.9 deaths) occurred during the peak window (April 14 to May 11), representing an increase of 145% (95% CI 70% to 338%) compared with expected levels. During the same window, only 5 COVID-19-related out-of-hospital deaths were reported in official statistics. This corresponded with an increase in respiratory cases of 236.5% (95% CI 100.7% to 940.0%) and a decrease in mean Spo2 to 77.7% from 90.2% at baseline. The highest out-of-hospital death rates were observed in low-socioeconomic-status areas, although respiratory cases were more concentrated in high-socioeconomic-status areas. CONCLUSION: EMS systems may play an important sentinel role in monitoring excess out-of-hospital mortality and other trends during the COVID-19 crisis in low- and middle-income countries. Using EMS data, we observed increases in out-of-hospital deaths in Tijuana that were nearly 3-fold greater than increases reported in EMS data in Italy. Increased testing in out-of-hospital settings may be required to determine whether excess mortality is being driven by COVID-19 infection, health system saturation, or patient avoidance of health care. We also found evidence of worsening rates of hypoxemia among respiratory patients treated by EMS, suggesting a possible increase in silent hypoxemia, which should be met with increased detection and clinical management efforts. Finally, we observed social disparities in out-of-hospital death that warrant monitoring and amelioration. SN - 1097-6760 UR - https://www.unboundmedicine.com/medline/citation/33012377/Excess_Out_of_Hospital_Mortality_and_Declining_Oxygen_Saturation:_The_Sentinel_Role_of_Emergency_Medical_Services_Data_in_the_COVID_19_Crisis_in_Tijuana_Mexico_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0196-0644(20)30601-6 DB - PRIME DP - Unbound Medicine ER -