key: cord-0893508-de48cjln
authors: Harmon, Katherine J.; Fliss, Mike Dolan; Marshall, Stephen W.; Peticolas, Kathy; Proescholdbell, Scott K.; Waller, Anna E.
title: The impact of the COVID-19 pandemic on the utilization of emergency department services for the treatment of injuries
date: 2021-04-20
journal: Am J Emerg Med
DOI: 10.1016/j.ajem.2021.04.019
sha: 76ba7e5658e7e063d0d7f736f513ba6ed693392d
doc_id: 893508
cord_uid: de48cjln

CONTEXT: The global COVID-19 pandemic has had a major impact on the utilization of healthcare services; however, the impact on population-level emergency department (ED) utilization patterns for the treatment of acute injuries has not been fully characterized. OBJECTIVE: This study examined the frequency of North Carolina (NC) EDs visits for selected injury mechanisms during the first eleven months of the COVID-19 pandemic. METHODS: Data were obtained from the NC Disease Event Tracking and Epidemiologic Collection Tool (NC DETECT), NC's legislatively mandated statewide syndromic surveillance system for the years 2019 and 2020. Frequencies of January – November 2020 NC ED visits were compared to frequencies of 2019 visits for selected injury mechanisms, classified according to International Classification of Diseases, 10th Revision, Clinical Modification (ICD-10-CM) injury diagnosis and mechanism codes. RESULTS: In 2020, the total number of injury-related visits declined by 19.5% (N = 651,158) as compared to 2019 (N = 809,095). Visits related to motor vehicle traffic crashes declined by a greater percentage (29%) and falls (19%) declined by a comparable percentage to total injury-related visits. Visits related to assault (15%) and self-harm (10%) declined by smaller percentages. Medication/drug overdose visits increased (10%), the only injury mechanism studied to increase during this period. CONCLUSION: Both ED avoidance and decreased exposures may have contributed to these declines, creating implications for injury morbidity and mortality. Injury outcomes exacerbated by the pandemic should be addressed by timely public health responses.

On January 8, 2020, the Chinese Center for Disease Control and Prevention officially announced that a novel coronavirus, later named Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2), was the causative agent of a pneumonia of unknown etiology (COVID- 19) that had been spreading in China since December 2019 [1, 2] . As of November 23, 2020, COVID-19 had spread from China to 221 countries, resulting in over 58 million confirmed cases and 1.4 million deaths [3] .

The United States (US) had its first confirmed case of COVID-19 on January 29, 2020 [4] . As of November 23, 2020, the US had confirmed over 12 million cases and 255,000 fatalities, with all 50 States and the District of Columbia reporting cases and fatalities [5] .

To reduce disease transmission and the burden on the US healthcare system, federal, state, and local social/physical distancing measures (i.e., "stay-at-home" orders) were implemented across the nation. These measures limited gathering sizes, closed schools and nonessential businesses, and encouraged residents to stay-at-home [6] . Evidence suggests that these measures, even heterogeneously implemented, reduced COVID-19 transmission [7] .

The COVID-19 pandemic has had widespread direct effects on health and well-being of communities and indirect effects on policy, economics, and society. The impact on injury incidence and healthcare utilization has not been well-described at the population-level for a variety of unintentional and intentional injury mechanisms. We have used near-real time North Carolina (NC) emergency department (ED) visit data to enumerate injury-related ED visits during the 2020 pandemic and to compare the frequency of these ED visits to the corresponding period in 2019.

We collected aggregate ED visit data from the NC Disease Event Tracking and Epidemiologic Collection Tool (NC DETECT), NC's statewide syndromic surveillance system. NC DETECT is legislatively mandated to collect data from all 24/7, acute care, hospital-affiliated, civilian EDs in the State. NC DETECT collects, harmonizes, cleans, monitors data quality, and implements standardized case definitions for surveillance use [8, 9] .

We obtained weekly counts of all ED visits from January to mid-November in 2019 and 2020 (12/30/2018-11/16/2019 and 12/29/ 2019-11/14/2020). In NC DETECT, all "weeks" start on a Sunday and end on a Saturday. We defined quarters by week numbers (1-13, 14-26, 27-39, and 40-52) . Q4 data was only available through mid-November 2020 at time of publication, so the table comparisons constrain to that point for both years (see Table 1 footnote).

We examined the total number of ED visits and number of injuryrelated ED visits (presence of an International Classification of Diseases, 10th Revision, Clinical Modification [ICD-10-CM] injury diagnosis or mechanism code) using standard reporting functions available to authorized NC DETECT users. These case definitions are based on nationally standardized ICD-10-CM and keyword case definitions from the Center for Disease Control (CDC), Council of State and Territorial Epidemiologists (CSTE), and deep studies of the NC local context. The full list of the case definitions are available at https://ncdetect.org/casedefinitions/ [8].

We report total and cause-specific injuries (based on ICD-10-CM injury mechanism codes), including falls, motor vehicle traffic crashes (MVTs), medication/drug overdoses, assaults, and self-harm/suicide events.

We calculated count and percent changes in ED visit counts from 2019 to 2020. We assessed statistical significance of select trend and baseline changes after March 3, 2020, the date of the first reported NC case, by a Poisson distributed generalized linear model. All analyses were completed in RStudio® [9]. Table 1 enumerates these changes to total and mechanism-specific ED visits by quarter. Fig. 2 displays weekly mechanism-specific ED visit counts against a LOESS smooth line to aid visual interpretation.

The number of total NC ED visits in 2020 showed only a small reduction (−3%) compared to quarter 1 (January through March), moving from approximately 91,000 weekly visits in 2019 to 88,000 in 2020. That reduction began sharply in mid-March after the first NC case of COVID-19 was confirmed on March 3, 2020 [10] . A US National Emergency was declared soon after on March 13, 2020, followed by a NC Stay at Home order on March 30, 2020 [11, 12] . Total ED visits dramatically declined in quarter 2, from approximately 96,000 weekly visits in 2019 to just 61,000 in 2020 (−36%). This decline in total ED visits rebounded some in Q3, from 92,000 weekly visits in 2020 to 78,000 in 2020 (−15%). At the time of publication in Q4 this reduction seems to be holding steady (−15%).

The total number of injury-related ED visit counts displayed a similar pattern to total ED visits counts, with declines of 5%, 35%, and 17% in quarters 1, 2, and 3, respectively. There was, however, considerable variation across injury intents and mechanisms.

Among unintentional injury mechanisms, falling-related NC ED visits displayed similar trends to total ED and injury-related ED visit counts. The percent decrease for the number of MVT-related NC ED visits far exceeded other injury intents and mechanisms, declining 16%, 48%, and 22% in quarters 1, 2, and 3. The decline in transportation injury-related ED visits was not universal across modes, e.g., NC bicycle crash-related ED visits increased by nearly 10% during the months of March-April 2020 vs 2019 (data not displayed). Contrasting other injury mechanisms, the number of monthly unintentional medication/ drug overdose-related NC ED visits was unchanged in quarter 1 (+0.6%) and increased in quarter 2 (+6%) and quarter 3 (+19%). In quarter 3 this represented an additional 57 medication/drug overdose-related ED visits each week compared to 2019. A test for increased baseline found this post-COVID-19 increase statistically significant for medication/drug overdose (p < 0.0001) and increased trend during 2020 for all injury, falls, MVT, and self-harm / suicide (p < 0.0001).

For intentional injury mechanisms, assaults followed similar trends to total NC ED and injury-related ED visits. Conversely, ED visits related to self-harm/suicide did not experience as substantial a decline as most other injury mechanisms in quarter 2 (−26% for self-harm vs. −35% for all injury-related ED visits) and has nearly recovered to 2019 levels in quarter 3 and quarter 4 to date (−3%). These are all novel changes. As an example, no prior year (2016 through 2018) compared to 2019 was more than 1.7% different for all injury and 1.4% different for total ED visits (compared to −19% and −18% for 2020 vs. 2019, respectively).

Consistent with national estimates, from January to mid-November 2020 the total number of NC ED and injury-related ED visits decreased by 18% and 20%, respectively, following enactment of federal, state, and local policies aimed at reducing COVID-19 transmission [13] . The largest decline in NC injury-related ED visit counts was observed in quarter 2, with the number of visits in April 2020 nearly half that of 2019. Considerable variation by injury mechanism was observed, including greater reductions in MVT visits, lower reductions in selfharm visits, and significant increases in medication/drug overdoserelated visits.

Several explanations for the observed decline in NC injury-related ED visits are possible. For certain injury mechanisms, the reduction in ED visits may be related to decreases in exposure, with more people staying home and avoiding activities that may result in injury. For example, reductions in MVT ED visits trend with US traffic volumes declining 30%-50% during this period [14] .

Another likely contributor to the drop in ED visits is patient anxiety about contracting the SARS-CoV-2 virus while receiving healthcare. Patient ED avoidance for the treatment of minor injuries reduces hospital transmission of COVID-19 and frees up limited healthcare resources for treating more severely ill and injured patients (including patients with COVID-19). However, patients delaying or avoiding medical treatment risk exacerbating injury morbidity and mortality (e.g., wound infections). In New York City, there were 5293 excess deaths during the COVID-19 pandemic that were not confirmed or suspected COVID-19 cases, many assumed to be consequences of delaying medical care for serious medical conditions [15] . Recent evidence supports this conclusion, as national ED visit counts have decreased by more than 20% for life-threatening conditions, including myocardial infarction and stroke [16] .

Not all injury mechanisms experienced large declines in ED visit counts during the COVID-19 pandemic. NC ED visits related to drug overdoses increased and self-harm visits decreased less sharply than for other injury mechanisms. Similar trends have been observed using national syndromic surveillance data [17] . These trends may be related to the exacerbation of substance use, anxiety and stress-related disorders during the pandemic [18] [19] [20] [21] . It is vital that resources are allocated to tackle the pandemic's effect on mental health, substance use, and violence.

Finally, the absence of injury-related ED visits does not guarantee the absence of injury. While ED visits are often used as proxies for injury incidence, these data may be uniquely insufficient during pandemics that reduce healthcare-seeking behavior. Individuals avoiding healthcare for safety concerns has serious injury surveillance implications.

NC DETECT ED visit data are collected primarily for patient care and hospital administrative/billing purposes. Public health surveillance is a secondary function. While NC population-based ED visit data have many benefits and results may mirror other geographies, results may not be generalizeable to all US jurisdictions. Other data sources (EMS, poison center, deaths) may also yield invaluable insights.

The COVID-19 pandemic has had a substantial impact on ED utilization patterns for the treatment of injuries, with NC injury-related ED visits declining an average of 20% since January 2020. Possible explanations include a decrease in exposure to certain factors, such as road traffic volume, and reductions in ED utilization and healthcare seeking behavior related to anxiety about contracting the SARS-CoV-2 virus. Reductions in care-seeking behavior imply that current ED visit counts may underestimate total injuries more than usual. Social, economic, and other pandemic-related stressors may lead to increases in certain injury outcomes, causing increases in overdoses and proportionally smaller reductions in self-harm visits. Federal, state, and local governments should implement timely programs and policies to address injury outcomes exacerbated by the pandemic.

NC DETECT is a statewide public health syndromic surveillance system, funded by the NC Division of Public Health (NC DPH) Federal Public Health Emergency Preparedness Grant and managed through collaboration between NC DPH and UNC-CH Department of Emergency Medicine's Carolina Center for Health Informatics. The NC DETECT Data Oversight Committee does not take responsibility for the scientific validity or accuracy of methodology, results, statistical analyses, or conclusions presented. 

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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The authors acknowledge Dr. Lana Deyneka and Zachary Faigen with the Epidemiology Section, Communicable Disease Branch of the North Carolina Division of Public Health and Clifton Barnett, Dennis Falls, Amy Ising, and Shaun Mason at the Carolina Center for Health Informatics for their assistance in data acquisition and management.

None declared.

This study was reviewed and approved by the Institutional Review Board at the University of North Carolina at Chapel Hill. This study was also reviewed and approved by the North Carolina Division of Public Health.

The data used in this study contain protected health information and are not available for posting.