The Toxicology Investigators Consortium 2023 Annual Report.

Since 2010, the American College of Medical Toxicology (ACMT) Toxicology Investigators Consortium (ToxIC) has maintained the ToxIC Core Registry, a national case registry of in-hospital and clinic patient consultations submitted by medical toxicology physicians. Deidentified patient data entered into the registry includes patient demographics, reason for medical toxicology evaluation, exposure agents, clinical signs and symptoms, treatments and antidotes administered, and mortality. This fourteenth annual report provides data from 7392 patients entered into the Core Registry in 2023 by 36 participating sites comprising 61 distinct healthcare facilities, bringing the total case count to 102331 between 2010 and 2023. Ethanol was the most commonly reported exposure agent class (24.4%), followed by opioids (22.7%), non-opioid analgesics (16.7%), and antidepressants (11.7%). For the first time since the registry's initiation, in 2023, ethanol was the leading agent of exposure. There were 98 fatalities (case fatality rate of 1.3%). Additional descriptive analyses in this annual report were conducted to describe the reasons for medical toxicology consultation by age in 2023, and yearly trends for opioid and psychoactive exposures, physostigmine and rivastigmine treatments, and acetaminophen exposures treated with fomepizole.

Differences in Drug Poisonings Among Those Who Identify as Transgender Compared to Cisgender: An Analysis of the Toxicology Investigators Consortium (ToxIC) Core Registry, United States 2017-2021.

PURPOSE: In this manuscript, the abbreviation TG is defined as persons who identify as transgender, GNC is defined as persons who identify as gender nonconforming, and CG is defined as persons who identify as cisgender. TG and GNC (e.g., nonbinary), are those whose gender identity and sex assigned at birth do not align, as opposed to CG. This study describes drug poisonings among TG, GNC, and CG captured in the Toxicology Investigators Consortium (ToxIC) Core Registry during 2017-2021. METHODS: Authors conducted a secondary data analysis of medical toxicology physician consultations involving intentional exposures (i.e., use with the knowledge of the exposed person) within the ToxIC Core Registry from 2017 through 2021. Demographic characteristics, exposure intent, and reported drug classes are reported by gender identity and sex assigned at birth. FINDINGS: From a total of 15,800 medical toxicology consultations, 213 (1.3%) involved both TG (n = 187, 1.2%) and GNC (n = 26, 0.2%), and 15,587 (98.7%) involved CG. Among TG, 128 (68.8%) were transgender men, 58 (31.2%) transgender women. Sixty-two percent of TG/GNC (n = 132) and 34.8% of CG (n = 5,428) were aged ≤18 years. Reported intent for exposure (i.e., self-harm and misuse/harmful use) differed proportionally across both sexes assigned at birth and gender identity among transgender men and cisgender men. IMPLICATIONS: In the ToxIC Core Registry, the consultations varied proportionally by age group across TG/GNC and CG, with more than half of TG/GNC aged ≤18 years. The proportion of consultations also varied by intent across TG/GNC and CG. Further research to delineate differences between TG/GNC and CG could increase knowledge in prevention, assessment, and treatment of drug poisonings in this population.

Mass Carbon Monoxide Poisoning at a Daycare: A Public Health Lesson.

INTRODUCTION: Carbon monoxide (CO) poisoning is a leading cause of preventable toxicity-related deaths in the United States. We describe a case series of 16 individuals who were exposed to CO due to a malfunctioning furnace at a Pennsylvania daycare, a state which did not mandate CO detectors in daycares. METHODS: An institutional review board-approved retrospective analysis was performed, and de-identified patient records were examined. Collected data included age, sex, race, ethnicity, CO concentrations, arrival time, time to hyperbaric oxygen center contact, and time to transfer and discharge. RESULTS: Emergency medical services transported 16 patients to a tertiary care emergency department (ED) with both adult and pediatric departments. Fourteen patients were 10 years of age or younger. Fifteen patients arrived within one hour. Sixty-two percent (N=10) were male, and 94% (N=15) identified as Hispanic. Emergency physicians, medical toxicologists, clinicians, interpreters, and volunteers from across the hospital system were mobilized to the ED to assist with management. CONCLUSION: This large-scale daycare CO poisoning represents a potentially avoidable mass casualty incident among children and daycare staff and necessitated significant coordination of care. CO detectors in Pennsylvania daycares would provide early warning for staff, prevent or minimize toxicity, inform first responders, and better prepare EDs to handle similar situations.

Prevalence and predictors of HIV among patients presenting to US emergency departments with opioid overdose.

INTRODUCTION: Opioid overdose deaths in the U.S. have risen dramatically in the past decade, largely due to the surge in illicitly manufactured fentanyl. Injection drug use is a known risk factor for HIV, further complicating the long-term consequences of opioid use. The baseline prevalence of HIV among adults in the US is 0.46 %. The primary purpose of this study was to determine the prevalence and risk factors of HIV among patients presenting to the emergency departments (ED) with an acute opioid overdose. METHODS: This study is a prospective observational cohort study from the ToxIC Fentalog Study group. Patients age 18 years of age or older are included if they present to one of 10 participating U.S. hospitals in 9 states between September 2020 and May 2023 with a suspected opioid overdose and had waste serum available after routine laboratory testing. Clinical data is collected from the medical record and patient serum is sent for comprehensive toxicologic analysis via liquid chromatography quadrupole time-of-flight mass spectroscopy to detect the presence of over 1200 substances including illicit opioids, novel synthetic opioids, medications, and adulterants. Logistic multivariable regression was performed to examine the association between demographic, behavioral, and serum toxicology data with risk factors and HIV status. RESULTS: Among the total cohort (n=1690), 1062 cases had known HIV status (62.8 % of total sample). Among patients with a known HIV status, 60 (5.6 % [95 % CI: 4.2 %, 7.0 %]) were HIV positive. Patients with HIV reported stimulant use more frequently (13.3 %) than those without HIV (6.8 %; p=0.003). After controlling for confounding, bipolar psychiatric history was a significant independent predictor of HIV positivity (aOR: 1.08; 95 % CI: 1.02, 1.13) in this population. CONCLUSIONS: In this large multicenter cohort, the prevalence of HIV for ED patients with illicit opioid overdose was 9 times higher than that expected by the general population. Bipolar disorder appears to be a novel risk factor for HIV positivity in this patient population.

Heroin or fentanyl: Prevalence of confirmed fentanyl in ED patients with suspected heroin overdose.

Background: United States drug overdose deaths are being driven by the increasing prevalence of fentanyl, but whether patients are knowingly using fentanyl is unclear. We examined the analytical confirmation of fentanyl in emergency department (ED) patients with documented heroin overdose. Hypothesis: We hypothesized that the proportion of fentanyl and fentanyl analogs would be higher than that of confirmed heroin. Methods: This is a subgroup analysis from a prospective multicenter consecutive cohort of ED patients age 18+ with opioid overdose presenting to 10 US sites within the Toxicology Investigators Consortium from 2020 to 2021. Toxicology analysis was performed using liquid chromatography quadrupole time-of-flight mass spectrometry. De-identified toxicology results were paired with the clinical database. The primary outcome was the proportion of patients with fentanyl analytes detected in their serum. Results: Of 1006 patients screened, 406 were eligible, and of 168 patients who reported that they had taken heroin or had a documented heroin overdose, 88% (n = 147) were in fact found to have fentanyl and/or a fentanyl analog present on serum analysis (p < 0.0001). In contrast, only 46 of the 168 patients with reported or documented heroin overdose (27%) were found to have heroin biomarkers present. Conclusion: The prevalence of confirmed fentanyl in ED patients with suspected heroin overdose was extremely high, while the prevalence of heroin was very low. There was a high degree of mismatch between the opioids believed to be the overdose agent versus the actual opioids identified on serum toxicology. Clinicians in the United States should presume that fentanyl is involved in all illicit opioid overdoses and should counsel patients on harm reduction measures.

Load and go: Assessing safety outcomes of patients discharged from the emergency department after receiving phenobarbital for alcohol withdrawal.

Objectives: Phenobarbital (PB) is a long-acting GABA A-agonist with favorable pharmacokinetics (long half-life and duration of effect) that allows effective treatment of alcohol withdrawal (AW) after administration of a single loading dose. Current evidence suggests that in the setting of AW, PB administration may be associated with decreased hospital admissions and hospital length of stay. The aim of this study was to evaluate the safety outcomes of AW patients who were treated and discharged from the emergency department (ED) after receiving PB for AW. Methods: This retrospective chart review included a convenience sample of 33 AW patients who presented to four EDs within an 18-month span. Descriptive statistics (frequencies and percentages) were used to describe demographics, distribution of resources and referrals, and the safety outcomes of PB administration for low-risk AW patients. Patients were selected for inclusion in consultation with a medical toxicologist, treated with PB, and discharged from the ED. Electronic medical records were utilized to gather information on the patient cohort. Results: All patients were treated with at least a single loading dose of 5‒10 mg/kg (ideal body weight) of intravenous or per os PB during their ED stay. Only one patient had an unanticipated event after discharge, which was related to driving against advice. Two additional patients had ED revisits for recurrent alcohol use within 72 h, and 16 patients had recurrent alcohol use within 30 days. All 33 patients were provided with resources for linkage to treatment. None required hospital admission. Conclusion: ED PB "load and go" may be a safe, effective AW treatment that could help treat AW, facilitate linkage to specific rehabilitation treatments, and decrease hospital admissions.

Lithium Toxicity: A Case Report of Toxicity Resulting in a Third-degree Heart Block.

Introduction: Lithium is a medication used to treat bipolar disorder. It has a narrow therapeutic index, which frequently causes toxicity in patients. Case Report: We present an unusual case of a 66-year-old female with a history of bipolar disorder on chronic lithium, who developed a third-degree heart block, encephalopathy, and acute renal failure because of lithium toxicity. Conclusion: This case highlights a rare but life-threatening case of complete heart block in the setting of lithium toxicity. The patient was treated with hemodialysis and pacemaker placement.

A Case of a Serum Sickness-Like Reaction After Postexposure Rabies Prophylaxis.

BACKGROUND: Serum sickness secondary to rabies postexposure prophylaxis is not well documented in the medical literature. Our case describes serum sickness after exposure to human-derived rabies immunoglobulin (HRIG) and three human diploid rabies vaccines (HDCV) in a young adult male. CASE REPORT: A 30-year-old previously healthy male patient presented to the Emergency Department with complaints of fever, rash, and jaundice, and had a hospital course complicated by biliary stenosis likely secondary to reactive periportal lymphadenopathy. His initial laboratory values demonstrated obstructive jaundice and slightly elevated complement component 4 levels. These symptoms likely are due to the course of HRIG and HDCV vaccines the patient completed after being exposed to a rabies-positive bat in his home. The patient was hospitalized for 8 days, during which he underwent an endoscopic retrograde cholangiopancreatography with sphincterotomy and biliary stenting. He had one repeat hospitalization for acute blood loss anemia attributed to sphincterotomy, which did not require transfusion or further intervention. Liver biopsy showed cholestatic hepatitis. WHY SHOULD AN EMERGENCY PHYSICIAN BE AWARE OF THIS?: Medical literature describing serum sickness or a serum sickness-like reaction occurring from exposure to HRIG or HDCV is sparse despite the commonality of postexposure rabies prophylaxis in health care. It is important to educate practitioners on this potential complication and highlight next potential consultations and treatments.

Combined Ethylene Glycol Poisoning with Methemoglobinemia Due to Antifreeze Ingestion.

BACKGROUND: Antifreeze poisoning is potentially life-threatening and often requires multiple antidotal therapies and hemodialysis. Ethylene or propylene glycol toxicity is commonly caused by antifreeze ingestion. However, ingestion of antifreeze is typically not associated with methemoglobinemia. Currently, only one other case of antifreeze ingestion causing combined ethylene glycol poisoning and methemoglobinemia has been reported. CASE REPORT: A 56-year-old man presented after a witnessed, intentional, large-volume antifreeze ingestion. Evaluation revealed dark brown blood and significantly elevated methemoglobin and ethylene glycol levels. He was successfully treated with methylene blue, fomepizole, and hemodialysis. No other potential cause for methemoglobinemia was elucidated, and further research indicated that minor components of the specific antifreeze product served as an oxidizing agent. WHY SHOULD AN EMERGENCY PHYSICIAN BE AWARE OF THIS?: This case highlights the impact of minor, unreported product components that may significantly contribute to clinical toxicity, as well as the need to remain vigilant when reviewing product information and potential limitations therein.

Diagnosing Emergent Heterotopic Pregnancy via Point-of-Care Ultrasound: A Case Report.

Patients undergoing assisted reproductive treatments are at a much higher risk for developing heterotopic pregnancy, a rare complication marked by concurrent intrauterine and ectopic pregnancies. Ruptured ectopic pregnancies are one of the leading causes of pregnancy-related mortality. We report the case of a 31-year-old woman undergoing ovulation induction that presented to the emergency department (ED) with worsening abdominal pain. Point-of-care ultrasound (POCUS) performed in the ED identified a heterotopic pregnancy in which the ectopic gestational sac had ruptured. The patient was immediately taken to the operating room for surgical management without obtaining a formal radiology-performed ultrasound. Nonspecific abdominal pain is one of the most common complaints for patients presenting to the ED. The usage of POCUS allows for rapid visualization of the abdominal cavity to diagnose the underlying cause of a patient's abdominal pain. This case demonstrates that complex etiologies can be reliably visualized and diagnosed without needing to wait for a formal radiology study.

The Toxicology Investigators Consortium 2022 Annual Report.

Since 2010, medical toxicology physicians from the American College of Medical Toxicology (ACMT) Toxicology Investigators Consortium (ToxIC) have provided reports on their in-hospital and clinic patient consultations to a national case registry, known as the ToxIC Core Registry. De-identified patient data entered into the registry includes patient demographics, reason for medical toxicology evaluation, exposure agents, clinical signs and symptoms, treatments and antidotes administered, and mortality. This thirteenth annual report provides data from 7206 patients entered into the Core Registry in 2022 by 35 participating sites comprising 52 distinct healthcare facilities, bringing the total case count to 94,939. Opioid analgesics were the most commonly reported exposure agent class (15.9%), followed by ethanol (14.9%), non-opioid analgesic (12.8%), and antidepressants (8.0%). Opioids were the leading agent of exposure for the first time in 2022 since the Core Registry started. There were 118 fatalities (case fatality rate of 1.6%). Additional descriptive analyses in this annual report were conducted to describe the location of the patient during hospitalization, telemedicine consultations, and addiction medicine treatments.

Naloxone Use in Novel Potent Opioid and Fentanyl Overdoses in Emergency Department Patients.

Importance: Synthetic opioids, such as the fentanyl analogue and nitazene drug class, are among the fastest growing types of opioids being detected in patients in the emergency department (ED) with illicit opioid overdose (OD). However, clinical outcomes from OD of novel potent opioids (NPOs), specifically nitazenes, are unknown aside from small case series. Objective: To determine naloxone administration and clinical sequelae of patients who were in the ED with NPO overdose compared with fentanyl OD. Design, Setting, and Participants: This is a cohort study subgroup analysis of adults admitted to the ED and tested positive for NPOs among in the ongoing nationwide ToxIC Fentalog cohort study from 2020 to 2022. Patients who were in the ED with a presumed acute opioid OD and residual blood samples were included, and those testing positive for NPOs were analyzed. Patients were included in this analysis if their confirmatory testing was positive for an NPO analyte, such as brorphine, isotonitazene, metonitazene, and/or N-piperidinyl etonitazene. A comparison group included patients that were positive for fentanyl and devoid of any other analytes on toxicologic analysis. Exposures: Patients were exposed to NPOs, including brorphine, isotonitazene, metonitazene and/or N-piperidinyl etonitazene. Main Outcomes and Measures: The primary outcome was the total number of naloxone doses and total cumulative naloxone dose administered as part of routine clinical care following the OD. Naloxone requirements and clinical sequelae of NPO-positive patients were compared with those testing positive for fentanyl only. Results: During the study period, 2298 patients were screened, of whom 717 met inclusion criteria, 537 had complete laboratory testing data, with 11 (2.0%) positive for only fentanyl and 9 (1.7%) positive for NPOs (brorphine, isotonitazene, metonitazene, or N-piperidinyl etonitazene). The age range of patients was aged 20 to 57 years (4 males [44.4%] and 5 females [55.6%]). The NPO group received a statistically significantly higher mean (SD) number of naloxone boluses in-hospital (1.33 [1.50]) compared with the fentanyl group (0.36 [0.92]) (P = .02), which corresponded to a moderately large effect size (Cohen d = 0.78). Metonitazene overdose was associated with cardiac arrest and more naloxone doses overall. Metonitazene cases had a mean (SD) number of 3.0 (0) naloxone doses, and 2 of 2 patients (100%) with metonitazene overdoses were administered cardiopulmonary resuscitation. Conclusions and Relevance: In this cohort study of patients admitted to the ED with confirmed opioid overdose testing positive for NPOs, in-hospital naloxone dosing was high compared with patients who tested positive for fentanyl alone. Further study is warranted to confirm these preliminary associations.

Opioid overdoses involving xylazine in emergency department patients: a multicenter study.

INTRODUCTION: Illicit opioids, consisting largely of fentanyl, novel synthetic opioids, and adulterants, are the primary cause of drug overdose fatality in the United States. Xylazine, an alpha-2 adrenergic agonist and veterinary tranquilizer, is being increasingly detected among decedents following illicit opioid overdose. Clinical outcomes in non-fatal overdose involving xylazine are unexplored. Therefore, among emergency department patients with illicit opioid overdose, we evaluated clinical outcome differences for patients with and without xylazine exposures. METHODS: This multicenter, prospective cohort study enrolled adult patients with opioid overdose who presented to one of nine United States emergency departments between 21 September 2020, and 17 August 2021. Patients with opioid overdose were screened and included if they tested positive for an illicit opioid (heroin, fentanyl, fentanyl analog, or novel synthetic opioid) or xylazine. Patient serum was analyzed via liquid chromatography quadrupole time-of-flight mass spectroscopy to detect current illicit opioids, novel synthetic opioids, xylazine and adulterants. Overdose severity surrogate outcomes were: (a) cardiac arrest requiring cardiopulmonary resuscitation (primary); and (b) coma within 4 h of arrival (secondary). RESULTS: Three hundred and twenty-one patients met inclusion criteria: 90 tested positive for xylazine and 231 were negative. The primary outcome occurred in 37 patients, and the secondary outcome occurred in 111 patients. Using multivariable regression analysis, patients positive for xylazine had significantly lower adjusted odds of cardiac arrest (adjusted OR 0.30, 95% CI 0.10-0.92) and coma (adjusted OR 0.52, 95% CI 0.29-0.94). CONCLUSIONS: In this large multicenter cohort, cardiac arrest and coma in emergency department patients with illicit opioid overdose were significantly less severe in those testing positive for xylazine.

African Bush Viper Envenomation: A Case Report.

Atheris squamigera envenomation is an infrequently documented occurrence in the United States (US). Cases of envenomation may induce severe coagulopathies, renal failure, and potentially life-threatening hemorrhage. Currently, there are no antivenoms specific to the Atheris genus, but there have been documented cases of the use of antivenoms for other species. A 26-year-old man presented to the emergency department (ED) complaining of swelling and discomfort in his left foot after being bitten by an Atheris squamigera that he kept as a pet.After performing a physical exam, it was noted that the patient's envenomation was likely mild. Throughout his hospital stay, he developed lab abnormalities, most notably an elevated D-dimer and low fibrinogen. His clinical symptoms improved after a short stay, and he did not require antivenom treatment. This case highlights a rare, but potentially life-threatening envenomation that may be encountered in the US due to the continued practice of exotic pet ownership and sales. Moreover, procurement of antivenom for non-native species poses a unique challenge to US physicians responsible for treating these patients.

Perioperative Management of Patients on Maintenance Medication for Addiction Treatment: The Development of an Institutional Guideline.

With a brief summary of selected literature identified by a multidisciplinary panel of subject matter experts, the authors share their experience with the development of an institutional perioperative pain management guideline for patients on maintenance medication for addiction treatment (MAT), stressing the importance of perioperative continuation of opioid agonists such as methadone and partial agonists such as buprenorphine; and the discontinuation of opioid antagonists, such as naltrexone. The authors' protocol is appended as an example of a standardized approach to perioperative management of patients on MAT.

Syndrome of Inappropriate Antidiuretic Hormone Secretion and Lead Toxicity in a Child With Sickle Cell Disease and Pica.

We describe the presentation and management of a three-year-old child with a history of pica, vitamin D deficiency, and sickle cell disease, who was admitted for pyelonephritis, and found to have elevated blood lead level (BLL) of 103.7 µg/dL, and who subsequently developed altered mental status and syndrome of inappropriate antidiuretic hormone secretion (SIADH). In consultation with Medical Toxicology, the patient was chelated with calcium disodium edetate (EDTA) and British Anti Lewisite (BAL). The patient's hyponatremia was managed with hypertonic saline infusion. The patient's encephalopathy improved throughout her hospital course, and she was discharged on hospital day 8. Following five days of EDTA and three days of BAL injections, her repeat BLL was 15.3 µg/dL. SIADH has been associated with severe lead poisoning and may be more likely to occur in high risk patients such as individuals with sickle cell anemia, particularly where medications are used that may cause iatrogenic hyponatremia.

The Toxicology Investigators Consortium 2020 Annual Report.

The Toxicology Investigators Consortium (ToxIC) Registry was established by the American College of Medical Toxicology in 2010. The registry collects data from participating sites with the agreement that all bedside and telehealth medical toxicology consultation will be entered. This eleventh annual report summarizes the Registry's 2020 data and activity with its additional 6668 cases. Cases were identified for inclusion in this report by a query of the ToxIC database for any case entered from January 1 to December 31, 2020. Detailed data was collected from these cases and aggregated to provide information which included demographics, reason for medical toxicology evaluation, agent and agent class, clinical signs and symptoms, treatments and antidotes administered, mortality, and whether life support was withdrawn. Gender distribution included 50.6% cases in females, 48.4% in males, and 1.0% identifying as transgender. Non-opioid analgesics were the most commonly reported agent class, followed by opioid and antidepressant classes. Acetaminophen was once again the most common agent reported. There were 80 fatalities, comprising 1.2% of all registry cases. Major trends in demographics and exposure characteristics remained similar to past years' reports. Sub-analyses were conducted to describe race and ethnicity demographics and exposures in the registry, telemedicine encounters, and cases related to the COVID-19 pandemic.

Reversible Total Vision Loss Caused by Severe Metformin-associated Lactic Acidosis: A Case Report.

INTRODUCTION: Metformin is a biguanide used to treat diabetes mellitus (DM). Metformin-associated lactic acidosis (MALA) carries a high mortality and can occur in patients with renal failure from drug bioaccumulation. Reversible vision loss is a highly unusual, rarely reported complication of MALA. We present a case of a patient whose serum metformin concentration was unusually high and associated with vision loss. CASE REPORT: A 60-year-old woman presented to an outside hospital emergency department with acute vision loss after being found at home confused, somnolent, and hypoglycemic, having last being seen normal two days prior. She reported vomiting and diarrhea during that time and a recently treated urinary tract infection. The visual loss resolved with continuous renal replacement therapy. CONCLUSION: This novel case of a patient with Type II DM prescribed metformin and insulin who developed reversible vision loss while suffering from MALA highlights the potential for vision loss in association with MALA.

Influence of Pennsylvania liquor store closures during the COVID-19 pandemic on alcohol withdrawal consultations.

INTRODUCTION: Alcohol withdrawal syndrome (AWS) is a serious consequence of alcohol use disorder (AUD). Due to the current COVID-19 pandemic there was a closure of Pennsylvania (PA) liquor stores on March 17, 2020. METHODS: This is a retrospective, observational study of AWS patients presenting to a tertiary care hospital. We used descriptive statistics for continuous and categorical variables and compared AWS consults placed to the medical toxicology service for six months preceding liquor store closure to those placed between March 17, 2020 and August 31, 2020. We compared this to consults placed to the medical toxicology service placed from October 1, 2019 through March 16, 2020. Charts were identified based on consults placed to the medical toxicology service, and alcohol withdrawal was determined via chart review by a medical toxicologist. This study did not require IRB approval. We evaluated Emergency Department (ED) length of stay (LOS), weekly and monthly consultation rate, rate of admission and ED recidivism, both pre- and post-liquor store closure. RESULTS: A total of 324 AWS consults were placed during the ten month period. 142 (43.8%) and 182 (56.2%) consults were pre- and post-liquor store closure. The number of consults was not statistically significant comparing these two time frames. There was no significant difference by patient age, gender, or race or by weekly or monthly consultation rate when comparing pre- and post-liquor store periods. The median ED LOS was 7 h (95% Confidence Interval (CI) Larson et al. (2012), Pollard et al. (2020) [5, 11]) and did not significantly differ between pre- and post-liquor store periods (p = 0.78). 92.9% of AWS patients required admission without significant difference between the pre- and post-liquor store closure periods (94.4% vs. 91.8%, p = 0.36). There was a significant increase in the number of AWS patients requiring a return ED visit (Odds Ratio 2.49; 95% CI [1.38, 4.49]) post closure. CONCLUSION: There were nearly 2.5 times greater odds of ED recidivism among post-liquor store closure AWS patients compared with pre-closure AWS patients.