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Take -home naloxone rescue kits following heroin overdose in the emergency department to prevent opioid overdose related repeat emergency department visits, hospitalization and death- a pilot study

Abstract

Background

Opioid overdoses are at an epidemic in the United States causing the deaths of thousands each year. Project DAWN (Deaths Avoided with Naloxone) is an opioid overdose education and naloxone distribution program in Ohio that distributes naloxone rescue kits at clinics and in the emergency departments of a single hospital system.

Methods

We performed a retrospective analytic cohort study comparing heroin overdose survivors who presented to the emergency department and were subsequently discharged. We compared those who received a naloxone rescue kit at discharge with those who did not. Our composite outcome was repeat opioid overdose related emergency department visit(s), hospitalization and death at 0–3 months and at 3–6 months following emergency department overdose. Heroin overdose encounters were identified by ICD- 9 or 10 codes and data was abstracted from the electronic medical record for emergency department patients who presented for heroin overdose and were discharged over a 31- month period between 2013 and 2016. Patients were excluded for previous naloxone access, incarceration, suicidal ideation, admission to the hospital or death from acute overdose on initial emergency department presentation. Data was analyzed with the Chi- square statistical test.

Results

We identified 291emergency department heroin overdose encounters by ICD-9 or 10 codes and were analyzed. A total of 71% of heroin overdose survivors received a naloxone rescue kit at emergency department discharge. Between the patients who did not receive a naloxone rescue kit at discharge, no overdose deaths occurred and 10.8% reached the composite outcome. Of the patients who received a naloxone rescue kit, 14.4% reached the composite endpoint and 7 opioid overdose deaths occurred in this cohort. No difference in mortality at 3 or 6 months was detected, p = 0.15 and 0.36 respectively. No difference in the composite outcome was detected at 3 or 6 months either, p = 0.9 and 0.99 respectively.

Conclusions

Of our emergency department patients receiving a naloxone rescue kit we did not find a benefit in the reduction of repeat emergency department visits hospitalizations, or deaths following a non-fatal heroin overdose.

Peer Review reports

Background

The United States is facing an epidemic of opioid overdose deaths of unprecedented scale [1,2,3]. Since 2000, our nation has seen a 137% increase in the rate of overdose related death, including a 200% increase in opioid related overdose death rate [2]. The momentum of this epidemic has not slowed with 70, 237 overdose deaths in 2017 and of these deaths, two thirds were attributed to an opioid [4, 5]. The New England and Midwestern states are among the most devastated regions of the country, with Ohio reporting a 98% increase in unintentional deaths between 2010 and 2015 [6].

The opioid crisis has spanned nearly three decades and has progressively become more deadly as synthetic opioids have become widely available [4]. The epidemic started in the mid-1990s with the increased availability of prescription opioid pain relievers [1, 3, 7]. Many opioid dependent users transitioned to heroin as a more cost-effective alternative to prescription opioids, which were becoming more difficult to obtain beginning in 2010 [4, 7, 8]. This transition was first described in a study of heroin users entering drug treatment in the last decade in which 75% reported that they were first introduced to heroin from prescription drugs [7]. This substitution of prescription opioids for heroin led to a tripling of overdose deaths over a four-year period [2]. In 2013, illicitly manufactured fentanyl (IMF), a purely synthetic opioid 50–100 times more potent than morphine emerged and continues to be the greatest current threat to opioid users [9]. IMF has been identified in combination with heroin, cocaine or as pure IMF [3, 10,11,12]. The rate of fatal overdose from fentanyl and its analogs have doubled each year between 2013 and 2016 in all age, gender and ethnic subgroups in the U.S. [12, 13] In Cuyahoga County, the unintentional overdose death rate per 100,000-population increased between 2013 and 2016 from 20.2 to 43.6 respectively, fueled by emergence of IMF. Statewide, overdose fatalities in Ohio attributed to fentanyl increased steadily as well: 4% in 2013, 19.9% in 2014, 37.9% in 2015 and 58.2% in 2016.

Risk factors contributing to fatal opioid overdose have been identified by other investigators and include: male gender, history of injection heroin use, a period of recent abstinence (commonly due to inpatient drug treatment or jail), mixing drugs, history of previous opioid overdose(s) and older age [14, 15].

Patients who use opioids frequently seek care in the emergency department (ED) allowing for a unique opportunity to offer novel interventions to reduce mortality and improve outcomes in this high- risk population [16, 17]. In a study of ED patients who survived opioid overdose, the one-year mortality rate was 5.5% with the highest risk of subsequent fatality occurring in the first month after overdose [18]. Interventions directed at reducing this early mortality that have shown promise include ED-initiated buprenorphine/naloxone treatment, access to a peer coaches, and take-home naloxone [19, 20]. Of these interventions, only ED initiated buprenorphine/naloxone has been rigorously evaluated [21, 22]. It is likely that additional interventions may also contribute to improved outcomes either alone or in combination. Without intervention in the ED, patients are likely to continue drug use and maintain a high risk for future fatal overdose.

Naloxone Hydrochloride is an opioid antagonist, which reverses the respiratory, and CNS depression of opioid overdose and can prevent death. Naloxone has been FDA approved for intravenous, intramuscular (IM) injection or intranasal (IN) administration [23,24,25]. The opioid antidote is available in the United States with a prescription, is not a controlled substance and has no potential for abuse.

While EDs and EMS providers frequently administer naloxone to reverse opioid overdose, until recently, laypersons did not readily have access to the antidote to revive overdose victims [26]. It has been shown that providing take-home naloxone rescue kits (NRKs) to at-risk patients reduces opioid overdose death rates in communities that implement opioid education and naloxone distribution programs and is cost effective under highly conservative estimates [27, 28]. The optimal amount of training required to competently respond to an overdose with naloxone is unknown, however both trained and untrained rescuers respond similarly when responding to an overdose suggesting that minimal education is required [29]. It has also been shown that providing naloxone rescue kits to patients in the ED is a feasible practice but still this potentially lifesaving intervention is not standard care in most E.Ds [19, 20, 30]. No studies to date have evaluated patient level outcomes in persons who receive NRKs in the ED.

Methods

Setting

This retrospective analytic cohort study took place at an urban academic medical center in Northeast Ohio with a main campus ED with 100, 000 annual visits. This same institution operates Cuyahoga County Project DAWN, Deaths Avoided with Naloxone, a hospital- based opioid education and naloxone distribution (OEND) program. DAWN was created to educate opioid users and other rescuers on risk factors, recognition and response to opioid overdose. The program distributes NRKs and was the sole point of access for take- home naloxone during this study period. Cuyahoga County Project DAWN is unaffiliated with the Drug Awareness Warning Network (DAWN) the public health surveillance system, managed by SAMHSA. In addition to the EDs of this medical center, project DAWN provides naloxone rescue kits (NRKs) at community walk- in sites, the Cuyahoga County Corrections Center (CCCC), and the inpatient units throughout this institution. Through our electronic medical record (EPIC, Verona WI), we were able to record all patient encounters for distribution of NRKs in the electronic health record of this single institution.

Prior to implementation of the naloxone distribution program in the ED, all providers, nurses and paramedics were educated with a mandatory educational module on the benefits of take home naloxone as well as the procedure for dispensing NRKs in the ED. A hospital wide policy for naloxone distribution was created for ordering take-home naloxone and was available to all providers and nurses. One year after ED program implementation, providers were surveyed on their knowledge and attitudes toward take-home naloxone in the ED and 66.7% of providers responded positively to the statement “This is a lifesaving intervention that I support.”

Participants

Adult patients between 18 and 89 years of age with an ICD-9 or 10 diagnosis of heroin overdose treated in the ED who were subsequently discharged were reviewed. Patients were excluded from further review if there was documentation of the following: previous NRK access, prescription for naloxone, incarceration while in the ED, reported suicidal ideation, admission to the hospital or death from acute overdose on initial ED presentation.

We evaluated the effect of take-home NRKs in adult ED patients presenting for heroin overdose who were subsequently discharged over a 31- month period between September 1, 2013 and April 1, 2016. For each eligible patient encounter following an ED non-fatal presentation, the composite outcome of repeat opioid overdose related ED visit(s), hospitalization, and death were recorded at 0–3 months and 3–6 months. Demographics and medical history for each patient were also recorded. At the first ED visit for heroin overdose, we recorded whether the patient received an NRK or not. Deaths were tracked by a subjects’ presentation to the Cuyahoga County Medical Examiner. Patients who received an NRK at ED discharge were compared to those who did not to determine if a statistically significant difference occurred. This study was reviewed, and a waiver of informed consent was approved by our hospital’s Institutional Review Board.

Measurement and data collection

ED heroin overdose encounters were initially identified by obtaining a report of all overdose related ICD-9 or 10 codes during the study period. Two research assistants with a bachelor’s degree education manually reviewed all encounters. Research assistants were trained to abstract data from the medical record prior to the start of the study using a set of “practice” medical records. The research assistants were trained on the abstraction protocol, case selection and inclusion/exclusion criteria. Each variable was explicitly defined as follows: independent variable was defined as receiving an NRK or not receiving an NRK at ED discharge. Dependent variables are opioid overdose related repeat ED visit(s), hospitalization(s) or death. Extraneous variables that were examined include: age, gender, zip code, refusal of naloxone rescue kit, history of past documented opioid overdose, recent period of abstinence, medical conditions, prescription medications, use of other illicit drugs and route of heroin administration as documented in the electronic health record. The data from the electronic chart was collected using a standardized abstraction form and entered into the Redcap secure database. Inter-rater agreement was calculated periodically throughout data collection from a sample of charts. Each research assistant was blinded to the results of the original abstractor. Performance of abstractors was monitored periodically throughout the study and inter-rater agreement was monitored and feedback on performance was given. Routine meetings were held to adjudicate conflicts and any data that was conflicting, missing, ambiguous or unknown. It was not practical to blind the abstractors to the purpose of the study.

Sample size calculation

We utilized a composite outcome of opioid overdose related repeat ED visits, hospitalization and mortality after ED discharge from opioid overdose. Limited data from the literature were available to accurately calculate a sample size in this population. Assuming a baseline incidence of the composite outcome of 5% and a treatment group incidence of 1%, a sample size of 284 patients in each group would be required to detect an effect size of 0.04 and provide a power of 80% with a type I error rate (alpha) of 5%.

Data analysis

Data are presented as frequencies and was analyzed with the Chi- square statistical test using Stata (State College, TX) statistical software.

Results

During the study period we identified 397 heroin overdoses, 69 patients met one or more exclusion criteria, 37 patients had missing or incomplete data and 291 were analyzed. Patients were excluded from further review if one or more of the following exclusion criteria were present: documentation of previous access to or prescription for naloxone (36), incarceration at time of initial ED overdose [4], suicidal ideation [9], admitted to the hospital at time of initial heroin overdose [31] or death [1].

The median age of analyzed patients was 34 years (IQR) and 70% were male. No ethnicity data was available for review. The following medical conditions were reported among all patients included for review: hypertension 17.1%, asthma/COPD 26.4%, diabetes 7.4%, hepatitis C 40.3%, HIV 2.8%, cardiac disease 13.6%, psychiatric disease 60.2%, other medical condition (19.4%). We found 74% reported a marital status of single, 13.5% married and 12.1% divorced. A total of 13.1% of patients had a current opioid prescription for analgesia, 2.9% had a current prescription for a benzodiazepine and 1.2% had a current prescription for an opioid for medication assisted treatment (MAT) of opioid use disorder (OUD). Prior opioid overdoses were recorded in 31.4% of all ED overdose survivors with 31% reporting a period of abstinence greater than 1 week prior to date of initial ED overdose during the study period.

Main results

Over the study period 71% of heroin overdose survivors received an NRK at ED discharge. A total of 39 unique patients reached one or more of the composite outcome measures recorded. Among the patients who did not receive an NRK at discharge, 38% were offered an NRK but refused it and 15% of these patients stated that they already had access to an NRK. No overdose deaths occurred among patients who did not receive an NRK and 10.8% reached the composite outcome. 14.4% of patients who received an NRK reached the composite endpoint and 7 opioid overdose deaths occurred in this cohort. Cause of death for each decedent is listed by month and year in Table 1. No deaths occurred in 2013 or 2014, and fentanyl or a fentanyl analog contributed to all deaths occurring in 2016. No difference in mortality at 3 or 6 months was detected, p = 0.15 and 0.36 respectively. No difference in reaching the composite outcome was detected at 3 or 6 months either, p = 0.9 and 0.99 respectively. Composite outcomes and mortality at 0–3 and 3–6 months are listed in Table 2.

Table 1 Cause of Death by Month and Year
Table 2 Composite outcomes at 0–3 and 3–6 months, n (%)

Discussion

EDs provide critical access for at–risk patients who use opioids and are an ideal setting to introduce novel interventions to reduce morbidity and mortality in this population. Although numerous interventions are currently being utilized, few have been rigorously studied to determine effectiveness. In this study, we were unable to detect a significant difference in patient level outcomes for overdose survivors who received an NRK at ED discharge. In a previous study by Walley, et al. opioid death rates were reduced in the communities that implemented OEND programs. This is likely explained by the observation that patients in their study reported that they used their naloxone for someone else (friend, stranger or partner/family) in 93% of the rescues, i.e. most people used their NRK to save someone other than themselves [28]. Hence, although a reduction in mortality rate in the community was reported, individual patient -level outcomes were not measured or reported.

In our study, it is notable that all fatalities and most patients who reached the composite outcome were in the group that received an NRK at ED discharge. This finding may be due to the greater proportion of overdose survivors (71%) that received an NRK. NRK distribution became standard care for overdose aftercare in our ED during the study period and increased over time (Table 3). In 2016, when ED overdose mortality peaked, 83% of overdose survivors were discharged with an NRK. Another factor that likely influenced this result is the overall increase in overdose mortality in Cuyahoga County during the study period (Table 4), which was driven by the introduction of more lethal IMF into the illicit drug market. This countywide change in cause of death was reflected in the overdose cause of death noted in our ED fatalities as well (Table 1).

Table 3 Year of ED NRK distribution between September 1, 2013 and April 1, 2016
Table 4 Cuyahoga County Overdoses 2013–2016

While our county was experiencing this dramatic spike in overdose fatalities (Table 4), we report a more modest increase in overall mortality year to year in our ED population (Table 1). Future investigations should be designed to further evaluate this trend and to determine which if any protective factors exist for patients evaluated in the ED for opioid overdose. Pre-existing protective factors in this population may include a safer drug use environment, availability of family/friends willing to activate EMS, bystander access to NRKs for overdose reversal and closer proximity to hospital. Additional protective factors provided by the ED may include stabilization of other underlying medical conditions, access to additional ED support services and referrals to addiction treatment and primary care.

The need for EDs to play a more active role in caring for patients who use illicit opioids has increased steadily over the past decade and is likely to continue for the foreseeable future. Future investigations are needed to determine which interventions are most effective.

This study adds to our overall knowledge of the characteristics of patients presenting to the ED for presumed heroin overdose in a community impacted predominately by heroin prior to 2015 and fentanyl thereafter. It is the first study to examine patient level outcomes in ED overdose victims who are discharged with an NRK and although the study was underpowered to detect an effect and the reported outcomes did not reach statistical significance, important data was gained that will be integral to the design and application of future investigations.

Limitations

The total number of patient encounters eligible for inclusion did not reach the calculated sample size; therefore, this retrospective study was underpowered to detect the desired effect size of 0.04. Additionally, our reported outcomes did not reach statistical significance.

Our institution operates all Project DAWN naloxone distribution sites in Cuyahoga County making it possible to determine if a patient has access to a naloxone kit through access to our electronic health record. Every attempt to exclude patients who had prior access to a naloxone kit was made, however it may have been possible that patients obtained a naloxone kit from an entity outside of Cuyahoga County confounding results. To limit the impact of this we reviewed all charts individually to determine if any documentation of prior kit access was noted in ED documentation as well as a review of all prescription medications.

Conclusions

Our study did not demonstrate a significant benefit in the patient level composite outcome of repeat ED visit, hospitalization and death between patients who received an NRK in the ED following a non-fatal heroin overdose and those who did not. Future investigations are needed to identify effective ED interventions to improve patient level outcomes in overdose survivors.

Availability of data and materials

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

Abbreviations

CCCC:

Cuyahoga County Corrections Center

CDC:

Centers for Disease Control

CNS:

Central nervous system

DAWN:

Deaths avoided with naloxone

ED:

Emergency department

EMS:

Emergency medical systems

FDA:

Federal Drug Administration

IM:

Intramuscular

IMF:

Illicitly manufactured fentanyl

IN:

Intranasal

NRK:

Naloxone rescue kit

OEND:

Opioid education and naloxone distribution

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Acknowledgements

Not applicable.

Funding

The Emergency Medicine Foundation generously supported the research presented in this publication and approved the study design. The Emergency Medicine Foundation did not participate in data collection, analysis, interpretation of data or writing the manuscript.

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Contributions

JP designed the study, analyzed and interpreted the data and authored the manuscript. JS analyzed and interpreted the data, reviewed and edited the manuscript. MV and AM abstracted data, read and approved the final manuscript. All authors have read and approve of the manuscript.

Corresponding author

Correspondence to Joan Papp.

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This study was reviewed and approved by the MetroHealth System’s Institutional Review Board (IRB) which provided a waiver of informed consent for this study.

Reference number IRB16–00077

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The authors declare that they have no competing interests.

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Papp, J., Vallabhaneni, M., Morales, A. et al. Take -home naloxone rescue kits following heroin overdose in the emergency department to prevent opioid overdose related repeat emergency department visits, hospitalization and death- a pilot study. BMC Health Serv Res 19, 957 (2019). https://doi.org/10.1186/s12913-019-4734-5

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Keywords

  • Heroin
  • Opioid
  • Overdose
  • Project DAWN
  • Naloxone
  • Mortality
  • Emergency department