Measuring a Crisis: Questioning the Use of Naloxone Administrations as a Marker for Opioid Overdoses in a Large U.S. EMS System

Objective: The United States is currently experiencing a public health crisis of opioid overdoses. To determine where resources may be most needed, many public health officials utilize naloxone administration by EMS as an easily-measured surrogate marker for opioid overdoses in a community. Our objective was to evaluate whether naloxone administration by EMS accurately represents EMS calls for opioid overdose. We hypothesize that naloxone administration underestimates opioid overdose. Methods: We conducted a chart review of suspected overdose patients and any patients administered naloxone in Wake County, North Carolina, from January 2013 to December 2015. Patient care report narratives and other relevant data were extracted from electronic patient care records and the resultant database was analyzed by two EMS physicians. Cases were divided into categories including “known opioid use,” “presumed opioid use,” “no known opioid,” “altered mental status,” “cardiac arrest with known opioid use,” “cardiac arrest with no known opioid use,” or “suspected alcohol intoxication,” and then further separated based on whether naloxone was administered. Patient categories were compared by patient demographics and incident year. Using the chart review classification as the gold standard, we calculated the sensitivity and positive predictive value (PPV) of naloxone administration for opioid overdose. Results: A total of 4,758 overdose cases from years 2013–15 were identified. During the same period, 1,351 patients were administered naloxone. Of the 1,431 patients with known or presumed opioid use, 57% (810 patients) received naloxone and 43% (621 patients) did not. The sensitivity of naloxone administration for the identification of patients with known or presumed opioid use was 57% (95% CI: 54%–59%) and the PPV was 60% (95% CI: 57%–63%). Conclusion: Among patients receiving care in this large urban EMS system in the United States, the overall sensitivity and positive predictive value for naloxone administration for identifying opioid overdoses was low. Better methods of identifying opioid overdose trends are needed to accurately characterize the burden of opioid overdose within and among communities.     

Out-of-hospital Treatment of Opioid Overdoses in an Urban Setting

Objectives : To investigate clinical outcomes in a cohort of opioid overdose patients treated in an out-of-hospital urban setting noted for a high prevalence of IV opioid use. Methods : A retrospective review was performed of presumed opioid overdoses that were managed in 1993 by the emergency medical services (EMS) system in a single-tiered, urban advanced life support (ALS) EMS system. Specifically. all patients administered naloxone by the county paramedics were reviewed. Those patients with at least 3 of 5 objective criteria of an opioid overdose [respiratory rate <6/min, pinpoint pupils, evidence of IV drug use, Glasgow Coma Scale (GCS) score <12, or cyanosis] were included. A response to naloxone was defined as improvement to a GCS 14 and a respiratory rate 10/min within 5 minutes of naloxone administration. ED dispositions of opioid-overdose patients brought to the county hospital were reviewed. All medical examiner's cases deemed to be opioid-overdose-related deaths by postmortem toxicologic levels also were reviewed. Results : There were 726 patients identified with presumed opioid overdoses. Most patients (609/726, 85.4%) had an initial pulse and blood pressure (BP). Most (94%) of this group responded to naloxone and all were transported. Of the remainder, 101 (14%) had obvious signs of death and 16 (2.2%) were in cardiopulmonary arrest without obvious signs of death. Of the patients in full arrest, 2 had return of spontaneous circulation but neither survived. Of the 609 patients who had initial BPs, 487 (80%) received naloxone IM (plus bag-valve-mask ventilation) and 122 (20%) received the drug IV. Responses to naloxone were similar; 94% IM vs 90% IV. Of 443 patients transported to the county hospital, 12 (2.7%) were admitted. The admitted patients had noncardiogenic pulmonary edema (n = 4). pneumonia (n = 2), other infections (n = 2), persistent respiratory depression (n = 2). and persistent alteration in mental status (n = 2). The patients with pulmonary edema were clinically obvious upon ED arrival. Hypotension was never noted and bradycardia was seen in only 2% of our presumed-opioid:overdose population. Conclusions : The majority of the opioid-overdose patients who had initial BPs responded readily to naloxone, with few patients requiring admission. Noncardiogenic pulmonary edema was uncommon and when present, hypoxia was evident upon arrival to the ED. Naloxone administered IM in conjunction with bag-valve-mask ventilation was effective in this patient population. The opioid-overdose patients in cardiopulmonary arrest did not survive.     

Are heroin overdose deaths related to patient release after prehospital treatment with naloxone?

Objective. Naloxone is frequently used by prehospital care providers to treat suspected heroin and opioid overdoses. The authors' EMS system has operated a policy of allowing these patients, once successfully treated, to sign out against medical advice (AMA) in the field. This study was performed to evaluate the safety of this practice. Methods. The authors retrospectively reviewed all 1996 San Diego County Medical Examiner's (ME'S) cases in which opioid overdoses contributed to the cause of death. The records of all patients who were found dead in public or private residences or died in emergency departments of reasons other than natural causes or progression of disease, are forwarded to the ME office. ME cases associated with opiate use as a cause of death were cross-compared with all patients who received naloxone by field paramedics and then refused transport. The charts were reviewed by dates, times, age, sex, location, and, when available, ethnicity. Results. There were 117 ME cases of opiate overdose deaths and 317 prehospital patients who received naloxone and refused further treatment. When compared by age, time, date, sex, location, and ethnicity, there was no case in which a patient was treated by paramedics with naloxone within 12 hours of being found dead of an opiate overdose. Conclusions. Giving naloxone to heroin overdoses in the field and then allowing the patients to sign out AMA resulted in no death in the one-year period studied. This study did not evaluate for return visits by paramedics nor whether patients were later taken to hospitals by private vehicles.     

Contemporary Prehospital Emergency Medical Services Response Times for Suspected Stroke in the United States

Background and Purpose: There are no contemporary national-level data on Emergency Medical Services (EMS) response times for suspected stroke in the United States (US). Because effective stroke treatment is time-dependent, we characterized response times for suspected stroke, and examined whether they met guideline recommendations. Methods: Using the National EMS Information System dataset, we included 911 calls for patients ≥ 18 years with an EMS provider impression of stroke. We examined variation in the total EMS response time by dispatch notification of stroke, age, sex, race, region, time of day, day of the week, as well as the proportion of EMS responses that met guideline recommended response times. Total EMS response time included call center dispatch time (receipt of call by dispatch to EMS being notified), EMS dispatch time (dispatch informing EMS to EMS starts moving), time to scene (EMS starts moving to EMS arrival on scene), time on scene (EMS arrival on scene to EMS leaving scene), and transport time (EMS leaving scene to reaching treatment facility). Results: We identified 184,179 events with primary impressions of stroke (mean age 70.4 ± 16.4 years, 55% male). Median total EMS response time was 36 (IQR 28.7–48.0) minutes. Longer response times were observed for patients aged 65–74 years, of white race, females, and from non-urban areas. Dispatch identification of stroke versus “other” was associated with marginally faster response times (36.0 versus 36.7 minutes, p < 0.01). When compared to recommended guidelines, 78% of EMS responses met dispatch delay of <1 minute, 72% met time to scene of <8 minutes, and 46% met on-scene time of <15 minutes. Conclusions: In the United States, time from receipt of 9-1-1 calls to treatment center arrival takes a median of 36 minutes for stroke patients, an improvement upon previously published times. The fact that 22%–46% of EMS responses did not meet stroke guidelines highlights an opportunity for improvement. Future studies should examine EMS diagnostic accuracy nationally or regionally using outcomes based approaches, as accurate recognition of prehospital strokes is vital in order to improve response times, adhere to guidelines, and ultimately provide timely and effective stroke treatment.     

Efficacy of intranasal naloxone as a needleless alternative for treatment of opioid overdose in the prehospital setting

Prehospital providers are at increased risk for blood-borne exposure and disease due to the nature of their environment. The use if intranasal (i.n.) medications in high-risk populations may limit this risk of exposure. To determine the efficacy of i.n. naloxone in the treatment of suspected opiate overdose patients in the prehospital setting, a prospective, nonrandomized trial of administering i.n. naloxone by paramedics to patients with suspected opiate overdoses over a 6-month period was performed. All adult patients encountered in the prehospital setting as suspected opiate overdose (OD), found down (FD), or with altered mental status (AMS) who met the criteria for naloxone administration were included in the study. i.n. naloxone (2 mg) was administered immediately upon patient contact and before i.v. insertion and administration of i.v. naloxone (2 mg). Patients were then treated by EMS protocol. The main outcome measures were: time of i.n. naloxone administration, time of i.v. naloxone administration, time of appropriate patient response as reported by paramedics. Ninety-five patients received i.n. naloxone and were included in the study. A total of 52 patients responded to naloxone by either i.n. or i.v., with 43 (83%) responding to i.n. naloxone alone. Seven patients (16%) in this group required further doses of i.v. naloxone. In conclusion, i.n. naloxone is a novel alternative method for drug administration in high-risk patients in the prehospital setting with good overall effectiveness. The use of this route is further discussed in relation to efficacy of treatment and minimizing the risk of blood-borne exposures to EMS personnel.     

Intranasal administration of naloxone by paramedics

Introduction. Naloxone is a medication that is frequently administered in the field by paramedics for suspected opioid overdoses. Most prehospital protocols, however, require this medication to be given to patients intravenously (IV) or intramuscularly (IM). Unfortunately, intravenous line placement may be problematic and time-consuming in chronic IV drug users. There may also be a delay in patient response to opioid reversal with IM absorption of naloxone. Additionally, routine use of needles in high-risk populations poses an increased risk of occupational blood exposures to paramedics. Objective. To prospectively test the effectiveness of intranasal (IN) naloxone administration by paramedics. This preliminary report summarizes the first month's experience in the city of Denver. Methods. Naloxone was first administered to patients found unconscious in the field using a nasal mucosal atomizer device (MAD). Patients were then treated using standard prehospital protocols, which included IV line placement and medications, if they did not immediately respond to IN naloxone. Time to patient response was recorded. Results. A total of 30 patients received IN naloxone in the field over a one-month period. Of these, 11 patients responded to either IN or IV naloxone. Ten (91%) patients responded to IN naloxone alone, with an average response time of 3.4 minutes. Seven patients (64%) did not require an IV in the field after response to IN naloxone. Conclusions. Intranasal naloxone may provide a safe, rapid, effective way to manage suspected opioid overdoses in the field. Use of this route may decrease paramedic exposures to blood-borne diseases. The addition of IN naloxone administration to prehospital protocols should be considered as an initial therapy for suspected opioid abusers. PREHOSPITAL EMERGENCY CARE 2002;6:54-58     

Assessment for Deaths in Out-of-hospital Heroin Overdose Patients Treated with Naloxone Who Refuse Transport

Naloxone frequently is used to treat suspected heroin and opioid overdoses in the out-of-hospital setting. The authors' emergency medical services system has operated a policy of allowing these patients, when successfully treated, to sign out against medical advice (AMA) in the field. OBJECTIVES: To evaluate the safety of this AMA policy. METHODS: This is a retrospective review of out-of-hospital and medical examiner (ME) databases over a five-year period. The authors reviewed all ME cases in which opioid overdoses were listed as contributing to the cause of death. These cases were cross-compared with all patients who received naloxone by field paramedics and then refused transport. The charts were reviewed by dates, times, age, sex, location, and ethnicity when available. RESULTS: There were 998 out-of-hospital patients who received naloxone and refused further treatment and 601 ME cases of opioid overdose deaths. When compared by age, time, date, sex, location, and ethnicity, there were no cases in which a patient was treated by paramedics with naloxone within 12 hours of being found dead of an opioid overdose. CONCLUSIONS: Giving naloxone to patients with heroin overdoses in the field and then allowing them to sign out AMA resulted in no identifiable deaths within this study population.     

Comparison of lower-dose versus higher-dose intravenous naloxone on time to recurrence of opioid toxicity in the emergency department

Introduction: The initial dose of naloxone administered to patients who present to the emergency department (ED) with opioid overdose is highly variable. The objective of this study was to determine if the initial dose of intravenous (IV) naloxone given to these patients was associated with the time to recurrence of opioid toxicity.

Methods: This was a multicenter retrospective cohort study, conducted at two academic EDs in the United States. Consecutive adults who had a positive response to naloxone for opioid overdose in the ED were included. Patients were categorized into two groups based on initial IV naloxone dose administered: 0.4?mg (lower-dose) or 1–2?mg (higher-dose). The main outcome measure was the time to recurrence of opioid toxicity requiring a second dose of naloxone. Secondary outcomes included the need for naloxone continuous infusion and adverse events.

Results: The study included 84 patients with 42 patients receiving lower-dose and 42 patients receiving higher-dose naloxone. Median time to re-dose of naloxone was similar between the lower-dose (72 [IQR 46–139] minutes) and higher-dose (70 [IQR 44–126] minutes) groups (p=.810). There were 12 patients (29%) in the lower-dose group and 17 patients (41%) in the higher-dose group who subsequently required continuous infusions (p=.359). The proportion of patients with adverse events was similar between lower-dose and higher-dose groups (31% versus 41%, p=.495). There was no difference in the incidence of specific withdrawal related adverse effects.

Conclusions: The initial dose of naloxone given to patients in the ED does not influence the time to recurrence of opioid toxicity.     

The changing epidemiology of opioid overdose in Baltimore,Maryland, 2012–2017: insights from emergency medical services

IntroductionAn estimated 100,306 people died from an overdose from May 2020 to April 2021. Emergency Medical Services (EMS) are often the first responder to opioid overdose, and EMS encounter records can provide granular epidemiologic data on opioid overdose. This study describes the demographic, temporal, and geographic epidemiology of suspected opioid overdose in Baltimore City using data from Baltimore City Fire Department EMS encounters with the administration of the opioid antagonist naloxone.MethodThe present analyses used patient encounter data from 2012 to 2017 from the Baltimore City Fire Department, the city’s primary provider of EMS services. The analytic sample included patient encounters within the city that involved naloxone administration to patients 15 years of age or older (n = 20,592). Negative binomial regression was used to calculate the incidence rates based on demographic characteristics, year, and census tract. Choropleth maps were used to show the geographic distribution of overdose incidence across census tracts in 2013, 2015, and 2017.ResultsFrom 2012 to 2017, the annual number of EMS encounters with naloxone administrations approximately doubled every 2 years, and the temporal pattern of naloxone administration was similar to the pattern of fatal opioid-related overdoses. For most census tracts, incidence rates significantly increased over time. Population-based incidence of naloxone administration varied significantly by socio-demographic characteristics. Males, non-whites, and those 25–69 years of age had the highest incidence rates.ConclusionThe incidence of naloxone administration increased dramatically over the study period. Despite significant cross-sectional variation in incidence across demographically and geographically defined groups, there were significant proportional increases in incidence rates, consistent with fatal overdose rates over the period. This study demonstrated the value of EMS data for understanding the local epidemiology of opioid-related overdose.

Key Messages

• Patterns of EMS encounters with naloxone administration appear to be an excellent proxy for patterns of opioid-related overdoses based on the consistency of fatal overdose rates over time.
• EMS plays a central role in preventing fatal opioid-related overdoses through the administration of naloxone, provision of other emergency services, and transportation to medical facilities.
• EMS encounters with naloxone administration could also be used to evaluate the impact of overdose prevention interventions and public health services.

     

Intranasal Naloxone Is a Viable Alternative to Intravenous Naloxone for Prehospital Narcotic Overdose

Objective. To compare the prehospital time intervals from patient contact and medication administration to clinical response for intranasal (IN) versus intravenous (IV) naloxone in patients with suspected narcotic overdose. Methods. This was a retrospective review of emergency medical services (EMS) and hospital records, before and after implementation of a protocol for administration of intranasal naloxone by the Central California EMS Agency. We included patients with suspected narcotic overdose treated in the prehospital setting over 17 months, between March 2003 and July 2004. Paramedics documented dose, route of administration, and positive response times using an electronic record. Clinical response was defined as an increase in respiratory rate (breaths/min) or Glasgow Coma Scale score of at least 6. Main outcome variables included time from medication to clinical response and time from patient contact to clinical response. Secondary variables included numbers of doses administered and rescue doses given by an alternate route. Between-group comparisons were accomplished using t-tests and chi-square tests as appropriate. Results. One hundred fifty-four patients met the inclusion criteria, including 104 treated with IV and 50 treated with IN naloxone. Clinical response was noted in 33 (66%) and 58 (56%) of the IN and IV groups, respectively (p = 0.3). The mean time between naloxone administration and clinical response was longer for the IN group (12.9 vs. 8.1 min, p = 0.02). However, the mean times from patient contact to clinical response were not significantly different between the IN and IV groups (20.3 vs. 20.7 min, p = 0.9). More patients in the IN group received two doses of naloxone (34% vs. 18%, p = 0.05), and three patients in the IN group received a subsequent dose of IV or IM naloxone. Conclusions. The time from dose administration to clinical response for naloxone was longer for the IN route, but the overall time from patient contact to response was the same for the IV and IN routes. Given the difficulty and potential hazards in obtaining IV access in many patients with narcotic overdose, IN naloxone appears to be a useful and potentially safer alternative.     

Intravenous vs Subcutaneous Naloxone for Out-of-hospital Management of Presumed Opioid Overdose

Objective : To determine whether naloxone administered IV to out-of-hospital patients with suspected opioid overdose would have a more rapid therapeutic onset than naloxone given subcutaneously (SQ).
Methods : A prospective, sequential, observational cohort study of 196 consecutive patients with suspected opioid overdose was conducted in an urban out-of-hospital setting, comparing time intervals from arrival at the patient's side to development of a respiratory rate ≥10 breaths/min, and durations of bag-valve-mask ventilation. Subjects received either naloxone 0.4 mg IV ( n = 74) or naloxone 0.8 mg SQ ( n = 122), for respiratory depression of <10 breaths/min.
Results : Mean interval from crew arrival to respiratory rate ≥ 10 breaths/min was 9.3 ± 4.2 min for the IV group vs 9.6 ± 4.58 min for the SQ group (95% CI of the difference -1.55, 1.00). Mean duration of bag-valve-mask ventilation was 8.1 ± 6.0 min for the IV group vs 9.1 ± 4.8 min for the SQ group. Cost of materials for administering naloxone 0.4 mg IV was $12.30/patient, compared with $10.70/patient for naloxone 0.8 mg SQ.
Conclusion : There was no clinical difference in the time interval to respiratory rate ≥10 breaths/min between naloxone 0.8 mg SQ and naloxone 0.4 mg IV for the out-of-hospital management of patients with suspected opioid overdose. The slower rate of absorption via the SQ route was offset by the delay in establishing an IV.     

Adverse events after naloxone treatment of episodes of suspected acute opioid overdose.

OBJECTIVE: An increasing and serious heroin overdose problem in Oslo has mandated the increasing out-of-hospital use of naloxone administered by paramedics. The aim of this study was to determine the frequencies and characteristics of adverse events related to this out-of-hospital administration by paramedics. METHODS: A one-year prospective observational study from February 1998 to January 1999 was performed in patients suspected to be acutely overdosed by an opioid. A total of 1192 episodes treated with naloxone administered by the Emergency Medical Service system in Oslo, were included. The main outcome variable was adverse events observed immediately after the administration of naloxone. RESULTS: The mean age of patients included was 32.6 years, and 77% were men. Adverse events suspected to be related to naloxone treatment were reported in 45% of episodes. The most common adverse events were related to opioid withdrawal (33%) such as gastrointestinal disorders, aggressiveness, tachycardia, shivering, sweating and tremor. Cases of confusion/restlessness (32%) might be related either to opioid withdrawal or to the effect of the heroin in combination with other drugs. Headache and seizures (25%) were probably related to hypoxia. Most events were non-serious. In three episodes (0.3%) the patients were hospitalized because of adverse events. CONCLUSION: Although adverse events were common among patients treated for opioid overdose in an out-of-hospital setting, serious complications were rare. Out-of-hospital naloxone treatment by paramedics seems to save several lives a year without a high risk of serious complications.     

Multiple Naloxone Administrations Among Emergency Medical Service Providers is Increasing

Background: Opioid overdoses are at epidemic levels in the United States. Emergency Medical Service (EMS) providers may administer naloxone to restore patient breathing and prevent respiratory arrest. There was a need for contemporary data to examine the number of naloxone administrations in an EMS encounter. Methods: Using data from the National Emergency Medical Services Information System, we examined data from 2012–5 to determine trends in patients receiving multiple naloxone administrations (MNAs). Logistic regression including demographic, clinical, and operational information was used to examine factors associated with MNA. Results: Among all events where naloxone was administered only 16.7% of the 911 calls specifically identified the medical emergency as a drug ingestion or poisoning event. The percentage of patients receiving MNA increased from 14.5% in 2012 to 18.2% in 2015, which represents a 26% increase in MNA in 4 years. Patients aged 20–29 had the highest percentage of MNA (21.1%). Patients in the Northeast and the Midwest had the highest relative MNA (Chi Squared = 539.5, p < 0.01 and Chi Squared = 351.2, p < 0.01, respectively). The logistic regression model showed that the adjusted odds ratios (aOR) for MNA were greatest among people who live in the Northeast (aOR = 1.18, 95% CI = 1.13–1.22) and for men (aOR = 1.13, 95% CI = 1.10–1.16), but lower for suburban and rural areas (aOR = 0.76, 95% CI = 0.72–0.80 and aOR = 0.85, 95% CI = 0.80–0.89) and lowest for wilderness areas (aOR = 0.76, 95% CI = 0.68–0.84). Higher adjusted odds of MNA occurred when an advanced life support (ALS 2) level of service was provided compared to basic life support (BLS) ambulances (aOR = 2.15, 95% CI = 1.45–3.16) and when the dispatch complaint indicated there was a drug poisoning event (aOR = 1.12, 95% CI = 1.09–1.16). Reported layperson naloxone administration prior to EMS arrival was rare (1%). Conclusion: This study shows that frequency of MNA is growing over time and is regionally dependent. MNA may be a barometer of the potency of the opioid involved in the overdose. The increase in MNA provides support for a dosage review. Better identification of opioid related events in the dispatch system could lead to a better match of services with patient needs.     

Suspected opioid-related emergency medical services encounters in a rural state, 1997-2002

Introduction

News organizations and governmental agencies have reported substantial increases in the number of opioid-related overdose cases in recent years.

Objective

To describe the utilization of emergency medical services (EMS) for suspected opioid-related overdose cases in a rural state during the period 1997 through 2002.

Methods

Statewide EMS records were reviewed for 1997 through 2002. Data reviewed included prehospital diagnosis and medications given to all patients by prehospital providers. For cases with a prehospital diagnosis of poisoning or overdose, data reviewed included medications given to patients by prehospital providers, pupil size, and respiratory rate. All records were reviewed in a defined sequence.

Results

The study period encompassed 1,175,781 patient encounters. Poisoning or overdose patients accounted for 19,808 (1.7%) encounters. Naloxone was administered by the EMS provider to 2,668 (0.2%) patients. For all poisoning or overdose patients, 1,308 (6.6%) had miotic pupils, 450 (2.2%) had a respiratory rate of <12 breaths/min, and 1,569 (7.9%) received naloxone. During the investigation period, total EMS patient encounters increased 25%, while patients with a complaint of poisoning or overdose increased 47%. The incidences of EMS overdose patients with miotic pupils, respiratory rate <10 breaths/min, and naloxone administration increased 167%, 295%, and 154%, respectively.

Conclusion

In this rural state, prehospital patients with findings suspicious for opioid overdose disproportionately outpaced the growth of all EMS encounters as well as general overdose encounters during the defined investigation period.     

Feasibility of Bystander Administration of Public-Access Naloxone for Opioid Overdose

Objective: Pre-stationing naloxone, a competitive antagonist that can reverse the effects of opioid overdose, in public spaces may expedite antidote delivery. Our study aimed to determine the feasibility of bystander-assisted overdose treatment using pre-stationed naloxone. Methods: Convenience sample of bystanders in Cambridge, Massachusetts in April 2017. Subjects assisted a simulated patient described as unconscious. Subjects interacted with simulated EMS dispatch to locate a nearby box, unlock it, and administer naloxone. Results: Fifty participants completed the simulation. Median time from simulated ambulance dispatch to naloxone administration was 189 seconds, and from arrival at patient side to administration 61 seconds. All but one participant (98.0%) correctly administered naloxone. Subjects' comfort with administration and willingness to provide medical care increased from before to after the trial. Comfort in administering naloxone varied significantly with level of previous training prior to, but not following, study participation. Conclusions: Bystanders are willing and able to access pre-stationed naloxone and administer it to a simulated patient in a public space. Public access naloxone stations may be a useful tool to reduce time to naloxone administration, particularly in areas where opioid overdoses are clustered.