Unintentional prescription drug overdose deaths in New Mexico, 1994-2003

Opioid and Benzodiazepine Substitutes: Impact on Drug Overdose Mortality in Medicare Population

INTRODUCTION

Gabapentinoids (GABAs) and serotonergic drugs (selective serotonin reuptake inhibitors [SSRIs]/serotonin and norepinephrine reuptake inhibitors [SNRIs]) are increasingly being prescribed as potential substitutes to opioids and benzodiazepines (benzos), respectively, to treat co-occurring pain and anxiety disorders. The toxicities of these drug classes and their combinations are not well understood.

METHODS

We conducted a matched case-control study using 2013-2016 Medicare files linked to the National Death Index. Cases were enrollees who died from drug overdose. Controls were enrollees who died from other causes. Cases and controls were matched on patient characteristics and prior chronic conditions. Possession of any opioids, GABAs, benzos, and SSRIs/SNRIs in the month prior to death was defined as drug use. Combination drug use was defined as possessing at least 2 types of these prescriptions for an overlapping period of at least 7 days in the month prior to death.

RESULTS

Among 4323 matches, benzo possession was associated with twice the risk for drug overdose death in cases vs controls. Compared with opioid-benzo co-prescribing, combinations involving SSRIs/SNRIs and opioids (or GABAs) were associated with decreased risk (adjusted odds ratio 0.55; 95% confidence interval, 0.44-0.69 for opioids and SSRIs/SNRIs; adjusted odds ratio 0.59; 95% confidence interval, 0.44-0.79 for GABAs and SSRIs/SNRIs). Fatal drug overdose risk was similar in users of GABA-opioid, GABA-benzo, and opioid-benzo combinations.

CONCLUSIONS

Benzodiazepines, prescribed alone or in combination, were associated with an increased risk of drug overdose death. SSRIs/SNRIs were associated with lower risk of overdose death vs benzodiazepines. GABAs were not associated with decreased risk compared with opioids, raising concerns for GABAs' perceived relative safety.

State Injury Programs' Response to the Opioid Epidemic: The Role of CDC's Core Violence and Injury Prevention Program

The Centers for Disease Control and Prevention's (CDC's) Core Violence and Injury Prevention Program (Core) supports capacity of state violence and injury prevention programs to implement evidence-based interventions. Several Core-funded states prioritized prescription drug overdose (PDO) and leveraged their systems to identify and respond to the epidemic before specific PDO prevention funding was available through CDC. This article describes activities employed by Core-funded states early in the epidemic. Four case examples illustrate states' approaches within the context of their systems and partners. While Core funding is not sufficient to support a comprehensive PDO prevention program, having Core in place at the beginning of the emerging epidemic had critical implications for identifying the problem and developing systems that were later expanded as additional resources became available. Important components included staffing support to bolster programmatic and epidemiological capacity; diverse and collaborative partnerships; and use of surveillance and evidence-informed best practices to prioritize decision-making.

Risk markers for fatal and non-fatal prescription drug overdose: a meta-analysis

BACKGROUND

Drug overdose is a public health crisis in the United States, due in part to the unintended consequences of increases in prescribing of opioid analgesics. Many clinicians evaluate risk markers for opioid-related harms when prescribing opioids for chronic pain; however, more data on predictive risk markers are needed. Risk markers are attributes (modifiable and non-modifiable) that are associated with increased probability of an outcome. This review aims to identify risk markers associated with fatal and non-fatal prescription drug overdose by synthesizing findings in the existing peer-reviewed and grey literature. Eligible cohort, case-control, cross-sectional, and case-cohort studies were reviewed and data were extracted for qualitative and quantitative synthesis.

FINDINGS

Summary odds ratios (SOR) were estimated from 29 studies for six risk markers: sex, age, race, psychiatric disorders, substance use disorder (SUD), and urban/rural residence. Heterogeneity was assessed and effect estimates were stratified by study characteristics. Of the six risk markers identified, SUD had the strongest association with drug overdose death (SOR = 5.24, 95% confidence interval (CI) = 3.53 - 7.76), followed by psychiatric disorders (SOR = 3.94, 95% CI = 3.09 - 5.01), white race (SOR = 2.28, 95% CI = 1.93 - 2.70), the 35-44 year age group relative to the 25-34 year reference group (SOR = 1.52, 95% CI = 1.31 - 1.76), and male sex (SOR = 1.33, 95% CI = 1.17 - 1.51).

CONCLUSIONS

This review highlights fatal and non-fatal prescription drug risk markers most frequently assessed in peer-reviewed and grey literature. There is a need to better understand modifiable risk markers and underlying reasons for drug misuse in order to inform interventions that may prevent future drug overdoses.

Examining Fatal Opioid Overdoses in Marion County, Indiana

Drug-related overdoses are now the leading injury-related death in the USA, and many of these deaths are associated with illicit opioids and prescription opiate pain medication. This study uses multiple sources of data to examine accidental opioid overdoses across 6 years, 2010 through 2015, in Marion County, IN, an urban jurisdiction in the USA. The primary sources of data are toxicology reports from the county coroner, which reveal that during this period, the most commonly detected opioid substance was heroin. During the study period, 918 deaths involved an opiod, and there were significant increases in accidental overdose deaths involving both heroin and fentanyl. In order to disentangle the nature and source of opioid overdose deaths, we also examine data from Indiana's prescription drug monitoring program and the law enforcement forensic services agency. Results suggest that there have been decreases in the number of opiate prescriptions dispensed and increases in law enforcement detection of both heroin and fentanyl. Consistent with recent literature, we suggest that increased regulation of prescription opiates reduced the likelihood of overdoses from these substances, but might have also had an iatrogenic effect of increasing deaths from heroin and fentanyl. We discuss several policy implications and recommendations for Indiana.

Worldwide Prevalence and Trends in Unintentional Drug Overdose: A Systematic Review of the Literature

BACKGROUND

Drug overdose is an important, yet an inadequately understood, public health problem. Global attention to unintentional drug overdose has been limited by comparison with the scope of the problem. There has been a substantial increase in drug overdose incidence and prevalence in several countries worldwide over the past decade, contributing to both increased costs and mortality.

OBJECTIVES

The aim of this study was to systematically synthesize the peer-reviewed literature to document the global epidemiological profile of unintentional drug overdoses and the prevalence, time trends, mortality rates, and correlates of drug overdoses. We searched different combinations of Medical Subject Headings (MeSH) terms in PubMed for articles published from 1980 until July 2013, and we organized these results in tabular spreadsheets and compared them. We restricted the search to English-language articles that deal with unintentional overdose, focusing on 1 or more of the following key constructs: prevalence, time trends, mortality rates, and correlates. The term "overdose" as a MeSH major topic yielded 1076 publications. In addition, we searched the following combinations of nonmajor MeSH terms: "street drugs" and "overdose" yielded 180, "death" and "overdose" yielded 114, and "poisoning" and "drug users" yielded 17. There was some overlap among the searches. Based on the search and inclusion and exclusion criteria, we selected a total of 169 relevant articles for this article based on a close review of abstracts.

RESULTS

We found wide variability in lifetime prevalence of experiencing a nonfatal overdose or witnessing an overdose, and in mortality rates attributable to overdose. Lifetime prevalence of witnessed overdose among drug users (n = 17 samples) ranged from 50% to 96%, with a mean of 73.3%, a median of 70%, and a standard deviation of 14.1%. Lifetime prevalence of drug users personally experiencing a nonfatal overdose (n = 27 samples), ranged from 16.6% to 68.0% with a mean of 45.4%, a median of 47%, and a standard deviation of 14.4%. Population-based crude overdose mortality rates (n = 28 samples) ranged from 0.04 to 46.6 per 100 000 person-years. This range is likely attributable to the diversity in regions, time periods, and samples. Most studies on longitudinal trends of overdose death rates or overdose-related hospitalization rates showed increases in overdose death rates and in overdose-related hospitalization rates across time, which have led to peaks in these rates at the present time. An overall trend of increasing deaths from prescription opioid use and decreasing deaths from illicit drug use in the past several years has been noted across most of the literature. With the increase in prescription opioid overdose deaths, drug overdose is not just an urban problem: rural areas have seen an important increase in overdose deaths. Lastly, cocaine, prescription opioids, and heroin are the drugs most commonly associated with unintentional drug overdoses worldwide and the demographic and psychiatric correlates associated with unintentional drug overdoses are similar globally.

CONCLUSIONS

There is a need to invest in research to understand the distinct determinants of prescription drug overdose worldwide. Several other countries need to collect in a systematic and continuous fashion such data on sales of prescription opioids and other prescription drugs, nonmedical use of prescription drugs, and hospitalization secondary to overdoses on prescription drugs. The sparse evidence on the environmental determinants of overdose suggests a need for research that will inform the types of environmental interventions we can use to prevent drug overdose. Methodological issues for future studies include enhancing data collection methods on unintentional fatal and nonfatal overdoses, and collecting more detailed information on drug use history, source of drug use (for prescription drugs), and demographic and psychiatric history characteristics of the individual who overdosed.

Sex Disparities in Post-Acute Myocardial Infarction Pharmacologic Treatment Initiation and Adherence: Problem for Young Women

BACKGROUND

The prevalence of the use of secondary prevention cardiovascular medications is lower among women than men, but it is unclear if this is a result of lower treatment initiation among women or lower treatment adherence. We aimed to map the treatment pathway for survivors of acute myocardial infarction (AMI) by sex and age.

METHODS AND RESULTS

This retrospective population-based cohort study used linked administrative data sets in British Columbia (2004-2011), which include health care, prescription drugs, sociodemographic, and mortality information. The study cohort included all individuals admitted to hospital for AMI in 2007-2009 and survived for 1 year after hospital discharge. Patients were evaluated for whether they initiated and then subsequently filled prescriptions angiotensin-converting enzyme inhibitors, β-blockers, and statins. More than two thirds of AMI survivors initiated treatment on all appropriate medications, given their contraindications, within 2 months of discharge. Younger men were significantly more likely than younger women to initiate appropriate treatment (adjusted odds ratio, 1.38; 95% confidence interval, 1.10-1.75). By the end of 1 year after discharge, only one third of all AMI survivors filled all appropriate prescriptions for at least 80% of the year. There was no significant difference in adherence to medication therapy between women and men.

CONCLUSIONS

The majority of AMI survivors either discontinue treatment or do not refill their prescriptions consistently. Women <55 years are significantly less likely to be on optimal therapy by the end of 1 year after discharge, which is driven by a sex disparity in treatment initiation and not treatment adherence.

The effect of preoperative counseling on duration of postoperative opiate use in orthopaedic trauma surgery: a surgeon-based comparative cohort study

OBJECTIVE

The prudent use of prescription opiates is a central aspect of current postsurgical pain management, but surgeons have no guidelines on appropriate duration of opiate treatment. Furthermore, there are no established data on the effect of physician counseling on the duration of opiate use postoperatively.

DESIGN

Retrospective surgeon-controlled cohort study.

SETTING

Level I regional academic trauma center.

PATIENTS

All Utah residents admitted to the orthopaedic trauma service with isolated operative musculoskeletal injury.

INTERVENTION

One group of patients was instructed at the time of index procedure that they would receive prescription opiates for a maximum of 6 weeks. The remaining patients were not counseled preoperatively on duration of opiate use postoperatively.

MAIN OUTCOME MEASURES

The presence and frequency of prescription opiate use before injury, cessation of opiate use by 6 weeks postoperatively, cessation of opiates by 12 weeks postoperatively, and continuation of prescription opiates greater than 12 weeks postoperatively.

RESULTS

Six hundred thirteen patients met inclusion criteria. Those counseled preoperatively to cease opiate use by 6 weeks were significantly more likely to do so than those who did not receive counseling (73% and 64%, respectively; P = 0.012). By 12 weeks, this effect was no longer seen, and patients were just as likely to have stopped (80% and 80%, respectively; P = 0.90).

CONCLUSIONS

The orthopaedic trauma population is significantly more likely than the general population to be using prescription opiates before injury. Physician discussion of 6-week opiate prescription limitation at the time of injury seems to lead to a lower rate of use at the 6-week postoperative mark but has no effect on rates of longer-term use. Twenty percent of patients in either group will continue to use opiates after 12 weeks, compared with 15% before injury. Given the scope of prescription opiate use in the United States, surgeons may want to consider preoperative discussion of this issue, but it may not have any effect on usage rates at longer intervals.

LEVEL OF EVIDENCE

Therapeutic Level III. See Instructions for Authors for a complete description of levels of evidence.

Determinants of increased opioid-related mortality in the United States and Canada, 1990-2013: a systematic review

We review evidence of determinants contributing to increased opioid-related mortality in the United States and Canada between 1990 and 2013. We identified 17 determinants of opioid-related mortality and mortality increases that we classified into 3 categories: prescriber behavior, user behavior and characteristics, and environmental and systemic determinants. These determinants operate independently but interact in complex ways that vary according to geography and population, making generalization from single studies inadvisable. Researchers in this area face significant methodological difficulties; most of the studies in our review were ecological or observational and lacked control groups or adjustment for confounding factors; thus, causal inferences are difficult. Preventing additional opioid-related mortality will likely require interventions that address multiple determinants and are tailored to specific locations and populations.

Association between opioid use and health care utilization as measured by emergency room visits and hospitalizations among persons living with HIV

BACKGROUND

Epidemiologic studies in the non-human immunodeficiency virus (HIV) positive population have shown greater health care utilization among persons with chronic non-cancer pain on opioid therapy. However, we are not aware of any similar data in the HIV positive population.

METHODS

We evaluated health care utilization, as measured by emergency room (ER) visits and hospitalizations, among persons with HIV and chronic pain seen at an academic medical center, during the calendar year 2005. We compared these outcomes between patients on chronic opioid therapy with those not on opioids.

RESULTS

In univariate models chronic opioid therapy was associated with both ER visits and hospitalization: ER visits odds ratio (OR)=2.18 (95% confidence interval [CI], 1.30-3.66), hospitalization OR=1.90 (95% CI, 1.03-3.51). After multivariate analyses only nonsignificant trends remain: ER visits OR=1.71 (95% CI, 0.95-3.08); hospitalization OR=1.28 (95% CI, 0.66-2.49).

CONCLUSIONS

In our study HIV positive individuals with chronic pain were more likely to be seen in the ER and be hospitalized if they were on opioids. However, after controlling for other variables, the association with opioids no longer remained significant.

Benzodiazepines

The misuse and abuse of prescription medications in the United States continues to increase despite interventions by health care professionals, regulatory, and law enforcement agencies. Opioid analgesics are the leading class of prescription drugs that have caused unintentional overdose deaths. Benzodiazepines when taken alone are relatively safe agents in overdose. However, a 5-fold increase in deaths attributed to benzodiazepines occurred from 1999 to 2009. Emergency department visits related to opioid analgesics increased by 111% followed by benzodiazepines 89%. During 2003 to 2009, the 2 prescriptions drugs with the highest increase in death rates were oxycodone 264.6% and alprazolam 233.8%. Therefore, benzodiazepines have a significant impact on prescription drug unintentional overdoses second only to the opioid analgesics. The combination prescribing of benzodiazepines and opioid analgesics commonly takes place. The pharmacokinetic drug interactions between benzodiazepines and opioid analgesics are complex. The pharmacodynamic actions of these agents differ as their combined effects produce significant respiratory depression. Physician and pharmacy shopping by patients occurs, and prescription drug-monitoring programs can provide important information on benzodiazepine and opioid analgesic prescribing patterns and patient usage. Health care professionals need to inform patients and work closely with regulatory agencies and legislatures to stem the increasing fatalities from prescription drug unintentional overdoses.

Using multiple cause-of-death data to improve surveillance of drug-related mortality

CONTEXT

Many states and local areas are affected by the national epidemic of drug-related mortality, which recently has shown signs of a rising "licit-to-illicit drug" death ratio. Appropriate local public health surveillance can help monitor and control this epidemic.

OBJECTIVE

Using our state as an example, we sought to illustrate how to describe the changes in drug death rates, causes, and circumstances. In contrast to most other surveillance reports, our approach includes both drug-induced and drug-related deaths as well as both demographic and socioeconomic characteristics of decedents.

DESIGN

Cross-sectional study.

SETTING

All residents of the state of Wisconsin.

PARTICIPANTS

Decedents from 1999 to 2008.

MAIN OUTCOME MEASURE

Annual numbers and population-based rates of deaths due to drugs, including both identified and unidentified drugs. Information was obtained from death certificates with any of approximately 270 underlying, immediate, or contributing cause-of-death codes from the International Classification of Diseases, 10th Revision.

RESULTS

Drug-related death rates increased during much of the 10-year study period, and the male-to-female death ratio rose. The median age at death from drug-related causes was 43 years. Opioid analgesic poisoning surpassed cocaine and heroin poisoning as the most frequent type of fatal drug poisoning. Of all 4828 deaths from drug-related causes--virtually all of which were certified by a county medical examiner or coroner--3410 (71%) were unintentional and 1053 (22%) were suicides. The unintentional-to-suicide death rate ratio grew from 1.6 to 3.5 during the study period. Methadone-related deaths increased from 10 in 1999 to 118 in 2008 (1080%), while benzodiazepine-related deaths rose from 23 to 106 (361%).

CONCLUSIONS

Although premature deaths from drug use and abuse continue to rise, even surpassing deaths due to motor vehicle crash in some states, "multiple causes of death" information from death certificates is available to monitor their occurrence and nature and to inform selection of prevention strategies.

Rates of prescription opiate use before and after injury in patients with orthopaedic trauma and the risk factors for prolonged opiate use

BACKGROUND

The prudent use of prescription opiate medications is a central aspect of postoperative pain management. The mortality associated with prescription opiate overdose is reaching epidemic proportions nationally, and is the leading cause of accidental death in greater than half the states in the United States. This study sought to determine the rates of preinjury opiate use in patients with orthopaedic trauma and the risk factors for prolonged use postinjury.

METHODS

The Utah Controlled Substance Database was queried to determine the use of prescription opiates by all patients admitted to the orthopaedic trauma service for a two-year period with isolated musculoskeletal injuries. Usage three months prior to injury and six months postinjury was examined.

RESULTS

Six hundred and thirteen patients met inclusion criteria. Among patients with orthopaedic trauma, 15.5% had filled a prescription for opiates in the three months prior to injury, compared with 9.2% of the general population (p < 0.001). More than one prescription was filled by 12.2% of the patients with trauma preinjury compared with 6.4% of the general population (p < 0.001). Postoperatively, 68.4% of all patients filled opiate prescriptions for less than six weeks, 11.9% filled opiate prescriptions between six and twelve weeks, and 19.7% filled opiate prescriptions past twelve weeks. Patients with preinjury use of more than one opiate prescription in the three months preinjury were six times as likely to continue use past twelve weeks, and 3.5 times as likely to obtain opiates from a provider other than their surgeon (p < 0.001). Opiate use was briefest with upper-extremity injuries, followed by lower-extremity injuries and pelvic or acetabular injuries. Regression models demonstrate that risk factors for prolonged use of opiates include advancing age and extent of preinjury use.

CONCLUSIONS

Patients with orthopaedic trauma are significantly more likely than the general population to use prescription opiates prior to injury. Preinjury opiate use is predictive of prolonged use postinjury and predictive of patients who will seek opiates from other providers.

Individual and network factors associated with prevalent hepatitis C infection among rural Appalachian injection drug users

OBJECTIVES

We determined the factors associated with hepatitis C (HCV) infection among rural Appalachian drug users.

METHODS

This study included 394 injection drug users (IDUs) participating in a study of social networks and infectious disease risk in Appalachian Kentucky. Trained staff conducted HCV, HIV, and herpes simplex-2 virus (HSV-2) testing, and an interviewer-administered questionnaire measured self-reported risk behaviors and sociometric network characteristics.

RESULTS

The prevalence of HCV infection was 54.6% among rural IDUs. Lifetime factors independently associated with HCV infection included HSV-2, injecting for 5 or more years, posttraumatic stress disorder, injection of cocaine, and injection of prescription opioids. Recent (past-6-month) correlates of HCV infection included sharing of syringes (adjusted odds ratio = 2.24; 95% confidence interval = 1.32, 3.82) and greater levels of eigenvector centrality in the drug network.

CONCLUSIONS

One factor emerged that was potentially unique to rural IDUs: the association between injection of prescription opioids and HCV infection. Therefore, preventing transition to injection, especially among prescription opioid users, may curb transmission, as will increased access to opioid maintenance treatment, novel treatments for cocaine dependence, and syringe exchange.

Characterizing Unintentional Nonillicit and Illicit Drug-Related Deaths

This study characterized individuals dying from illicit and nonillicit drug overdoses in Utah. Data were gathered from medical examiner records, death certificates, and next-of-kin interviews, 2008-2009. Among 374 decedents, 92 (25%) involved illicit drugs, 244 (65%) involved nonillicit drugs, and 38 (10%) involved a combination of both as the cause of death. Nonillicit compared with illicit drug-related decedents were more likely older, married, and of normal or overweight, and had a history of chronic pain. Nonillicit drug-related decedents were less likely to have had a history of alcohol and/or illicit drug use. Nevertheless, most decedents in both drug categories had a history of alcohol drinking and illicit substance use. Several psychological maladies characterized both illicit and nonillicit decedent cases, with a majority experiencing past anxiety, sadness, pain, insomnia, mood swings, irritability, hopelessness, and excessive daytime sleepiness. Impulsive tendencies and mood swings were more common in illicit drug-related deaths.

The influence of living along the U.S.-Mexico border on unintentional drug overdose death, New Mexico (USA), 2005-2009

BACKGROUND

The objective of this study was to characterize unintentional drug overdose death patterns among Hispanic ethnicity/sex strata by residence in New Mexico counties that border Mexico and non-border counties.

METHODS

We analyzed medical examiner data for all unintentional drug overdose death in New Mexico during 2005-2009. Logistic and Poisson regression was used to examine the relationship of unintentional drug overdose death with border residence and demographics. Risk of overdose death was examined by the interactions of ethnicity, sex and border residence.

RESULTS

During 2005-2009, the statewide drug overdose death rate was 17.6 per 100,000 (n=1812). Border decedents were more likely to have died from overdose of prescription opioids other than methadone (Schedule II, Adjusted Odds Ratio (aOR)=1.98; Schedule III/IV, aOR=1.56) but less likely to have died from heroin overdose (aOR=0.35), compared to non-border decedents. In population-based analyses, people living in border counties had lowest rates of overall overdose death and from illicit drugs, particularly heroin and cocaine. Hispanic males (adjusted incidence rate ratio [aRR]=2.41), Hispanic females (aRR=1.77) and non-Hispanic males (aRR=1.37) from non-border counties had higher risk of drug overdose death than their counterparts from border counties. Border residence had no effect on risk of drug overdose death among non-Hispanic females.

CONCLUSIONS

Residents in border counties incurred a protective effect for drug overdose death, most pronounced among Hispanics. There is a component of overdose death risk for which border residence is a proxy, likely an array of cultural and healthcare-related factors.

Forensic Pathology and Epidemiology, Public Health and Population-Based Research

Forensic pathology can play a pivotal role in safeguarding public health. While medicolegal death investigation focuses on certifying cause and manner of individual deaths, taken in aggregate this information provides a powerful tool for epidemiologic research. The published literature provides numerous examples of the utility of forensic pathology in public health research, from describing trends in substance abuse deaths to reducing occupational fatalities and identifying unusual infectious disease deaths. Medical examiner and coroner (ME/C) offices contribute to public health research by participating in surveillance systems, including those for sudden unexplained infant deaths and violent deaths, and by alerting public health agencies to emerging threats. Accessing and utilizing ME/C data for epidemiologic research can be challenging, given the wide variation in types of jurisdictions and the availability of electronic data, but the rewards for researchers justify the endeavor. Mutually beneficial relationships can develop between epidemiologists and ME/Cs, improving both public health and medicolegal death investigation.

Epidemiologic trends and geographic patterns of fatal opioid intoxications in Connecticut, USA: 1997-2007

BACKGROUND

The leading cause of injury death among adults in Connecticut (CT), USA is drug poisonings. We analyzed the epidemiology and geographic distribution of opioid-involved accidental drug-involved intoxication deaths ("overdoses") in CT over an 11-year period.

METHODS

We reviewed data from 1997 to 2007 on all adult accidental/undetermined drug intoxication deaths in CT that were referred to the Office of the Chief Medical Examiner (OCME). Regression analyses were conducted to uncover risk factors for fatal opioid-involved intoxications and to compare heroin- to prescription opioid- and methadone-involved deaths. Death locations were mapped to visualize differences in the geographic patterns of overdose by opioid type.

RESULTS

Of the 2900 qualifying deaths, 2231 (77%) involved opioids. Trends over time revealed increases in total opioid-related deaths although heroin-related deaths remained constant. Methadone, oxycodone and fentanyl, the most frequently cited prescription opioids, exhibited significant increases in opioid deaths. Prescription opioid-only deaths were more likely to involve other medications (e.g., benzodiazepines) and to have occurred among residents of a suburban or small town location, compared to heroin-involved or methadone-involved deaths. Heroin-only deaths tended to occur among non-Whites, were more likely to involve alcohol or cocaine and to occur in public locations and large cities.

CONCLUSIONS

The epidemiology of fatal opioid overdose in CT exhibits distinct longitudinal, risk factor, and geographic differences by opioid type. Each of these trends has implications for public health and prevention efforts.

Increase in unintentional medication overdose deaths: Oklahoma, 1994-2006

BACKGROUND

During 1999-2006, rates of unintentional drug-related deaths increased 120% in the U.S.

PURPOSE

This report describes demographics and trends of unintentional medication overdose deaths among Oklahoma residents to target prevention strategies.

METHODS

Oklahoma medical examiner data regarding fatal unintentional poisonings involving at least one prescription or over-the-counter medication during 1994-2006 and opioid retail sales data during 1997-2006 were analyzed during 2008-2009 to determine demographic-specific rates of overdose deaths and changes in 3-year mean death rates.

RESULTS

A total of 2112 fatal unintentional medication overdoses were identified (4.7 deaths/100,000 population) involving a median of two substances/decedent. The highest fatality rates occurred among men (5.9/100,000) and people aged 35-54 years (11/100,000). Crude overdose death rates increased sevenfold during the investigation period, peaking at 11/100,000 in 2006. Death rates increased more for women (ninefold) than men (sixfold); rates among residents of rural counties increased more (eightfold) than urban county rates (sixfold). Leading drug types involved in fatalities were opioids and anxiolytics. The individual drugs contributing most frequently included methadone (31%); hydrocodone (19%); alprazolam (15%); and oxycodone (15%). During 1997-2006, Oklahoma prescription opioid sales increased fourfold. Methadone was associated with the highest number of deaths per equianalgesic dose sold (23.3), whereas hydrocodone and oxycodone had the highest increases in deaths per equianalgesic dose sold (threefold increase each).

CONCLUSIONS

Unintentional medication-related deaths are increasing in Oklahoma and often involve multiple substances. Substances most frequently contributing to deaths were prescription opioid analgesics. Prevention strategies should target people aged 35-54 years and emphasize the dangers of coingesting substances and misusing prescription pain medications.

Geographic information systems and pharmacoepidemiology: using spatial cluster detection to monitor local patterns of prescription opioid abuse

PURPOSE

Understanding the spatial distribution of opioid abuse at the local level may facilitate public health interventions.

METHODS

Using patient-level data from addiction treatment facilities in New Mexico from ASI-MV Connect, we applied geographic information system (GIS) in combination with a spatial scan statistic to generate risk maps of prescription opioid abuse and identify clusters of product- and compound-specific abuse. Prescribed opioid volume data was used to determine whether identified clusters are beyond geographic differences in availability.

RESULTS

Data on 24 452 patients residing in New Mexico were collected. Among those patients, 1779 (7.3%) reported abusing any prescription opioid (past 30 days). According to opioid type, 979 patients (4.0%) reported abuse of any hydrocodone, 1007 (4.1%) for any oxycodone, 108 (0.4%) for morphine, 507 (2.1%) for Vicodin or generic equivalent, 390 (1.6%) for OxyContin, and 63 (0.2%) for MS Contin or generic equivalent. Highest rates of abuse were found in the area surrounding Albuquerque with 8.6 patients indicating abuse per 100 interviewed patients. We found clustering of abuse around Albuquerque (P = 0.001; Relative Risk = 1.35, and a radius of 146 km). At the compound level, we found that drug availability was partly responsible for clustering of prescription opioid abuse. After accounting for drug availability, we identified a second foci of Vicodin abuse in the southern rural portion of the state near Las Cruces, NM and El Paso, Texas and bordering Mexico (RR = 2.1; P = 0.001).

CONCLUSIONS

A better understanding of local risk distribution may have implications for response strategies to future introductions of prescription opioids.

Unintentional overdose and suicide among substance users: a review of overlap and risk factors

Substance use is a risk factor for suicide, suicide attempts, and fatal and non-fatal overdose, but to date, little has been done to integrate the research on suicidal behavior and overdose among substance users. This study reviews the literature on suicide and overdose among substance users with the goal of illuminating the similarities and differences between these two events. A structured review resulted in 15 articles (describing 14 unique studies) published between 1990 and 2010 that examined both overdose and suicide in samples of substance users. There is some evidence that substance users who attempt suicide are more likely to report an overdose and vice versa. This relationship may be partially explained by the fact that overdose is a common method of suicide. The results of the literature review also indicate that substance users with a history of both events may represent a group with particularly poor psychological and social functioning and severe drug-related problems. Further research is needed to understand the overlap of, and differences between, suicide and accidental overdose among individuals who misuse substances, particularly individuals who primarily use substances other than heroin. An improved understanding of the interrelationships between suicide and unintentional overdose among individuals who use alcohol or drugs is necessary to guide the development of effective prevention and intervention approaches.

Development of a coroner-based surveillance system for drug-related deaths in Los Angeles county

Existing data sources do not provide comprehensive and timely information to adequately monitor drug-related mortality in Los Angeles County. To fill this gap, a surveillance system using coroner data was developed to examine patterns in drug-related deaths. The coroner provided data on all injury deaths in Los Angeles County. A list of keywords that indicate a death was caused by drug use was developed. The cause of death variables in the coroner data were searched for mentions of one of the keywords; if a keyword was detected, that death was classified as drug related. The effectiveness of the keyword list in classifying drug-related deaths was evaluated by matching records in the coroner death data to records in the state death files. Then, the drug-related deaths identified using the keywords were compared to drug-related deaths in the state mortality files identified using International Classification of Death codes. Toxicological test results were used to categorize drug-related deaths based on the type and legality of the drug(s) ingested. Mortality rates were calculated for each category of drug and legal status and for different demographic groups. Compared to the gold standard state mortality files, the coroner data had a sensitivity of 95.6% for identifying drug-related deaths. Over three quarters of all drug-related deaths tested positive for opiates and/or stimulants. Males, Whites, and 35-54-year-olds each accounted for more than half of all drug-related deaths. The surveillance of drug-related deaths using coroner data has several advantages: data are available in a timely fashion, the data include information about the specific substances each victim ingested, and the data can be broken down to compare mortality among specific subpopulations.

Fatal drug poisonings in a Swedish general population

BACKGROUND

Pharmaceutical drug poisonings have previously been reported using single sources of information, either hospital data or forensic data, which might not reveal the true incidence. We therefore aimed to estimate the incidence of suspected fatal drug poisonings, defined as poisonings by pharmaceutical agents, by using all relevant case records from various sources in a Swedish population.

METHODS

Every seventh randomly selected deceased in three counties in southeastern Sweden during a one-year period was identified in the Cause of Death Register. Relevant case records (death certificates, files from hospitals and/or primary care centres and medico-legal files) were reviewed for all study subjects.

RESULTS

Of 1574 deceased study subjects, 12 cases were classified as pharmaceutical drug poisonings according to the death certificates and 10 according to the medico-legal files. When reviewing all available data sources, 9 subjects (0.57%; 95% confidence interval: 0.20-0.94%) were classified as drug poisonings, corresponding to an incidence of 6.5 (95% confidence interval: 2.3-10.7) per 100,000 person-years in the general population. The drug groups most often implicated were benzodiazepines (33%), antihistamines (33%) and analgesics (22%).

CONCLUSION

Fatal drug poisonings is a relatively common cause of death in Sweden. By using multiple sources of information when investigating the proportion of fatal poisonings in a population, more accurate estimates may be obtained.

Opioid deaths in rural Virginia: a description of the high prevalence of accidental fatalities involving prescribed medications

In rural Virginia, drug overdose deaths increased 300% from 1997 to 2003. Polydrug deaths predominate (57.9%) in this review of 893 medical examiner cases. Prescription opioids (74.0%), antidepressants (49.0%), and benzodiazepines (39.3%) were more prevalent than illicit drugs. Two-thirds of decedents were 35-54 years old; 37% were female. When compared to western Virginia metropolitan cases, polydrug abuse was more common, specific medication combinations were found, the death rate per population was higher, and fewer illicit drugs were detected. These rural prescription overdose deaths differ from urban illicit drug deaths, suggesting the need for different strategies in prevention, treatment, and intervention by clinicians and policymakers.

Mortality after lumbar fusion surgery

STUDY DESIGN

Retrospective population-based cohort study.

OBJECTIVE

To describe mortality after lumbar fusion surgery in Washington State workers' compensation claimants in the perioperative period and beyond.

SUMMARY OF BACKGROUND DATA

Although lumbar fusion surgery can be associated with serious complications, perioperative mortality is generally considered rare. Population-based mortality estimates have been limited to surgery in older adults.

METHODS

We identified all Washington State workers' compensation claimants who underwent fusion between January 1994 and December 2001 (n = 2378) and assessed the frequency, timing, and causes of death. Mortality follow-up was concluded in 2004. Death was ascertained from Washington State vital statistics records and from the workers' compensation claims database. Poisson regression was used to obtain age- and gender-adjusted mortality rates. Years of potential life lost, percent of potential life lost, and mean potential life lost were calculated for the leading 5 causes of death and we calculated the risk of death associated with selected predictors.

RESULTS

Among the 2378 lumbar fusion subjects in the study cohort, 103 were deceased by 2004. The 3-year cumulative mortality rate was 1.93% (95% confidence interval, 1.41%-2.57%). The 90-day perioperative mortality rate was 0.29% (95% confidence interval, 0.11%-0.60%). The risk of perioperative mortality was positively associated with repeat fusions. The age- and gender-adjusted all-cause mortality rate was 3.1 deaths per 1000 worker-years (95% confidence interval, 0.9-9.8). Analgesic-related deaths were responsible for 21% of all deaths and 31.4% of all potential life lost. The risk of analgesic-related death was higher among workers who received instrumentation or intervertebral cage devices compared with recipients of bone-only fusions (1.1% vs. 0.0%; P = 0.03) and among workers with degenerative disc disease (age- and gender-adjusted mortality rate ratio, 2.71) (95% confidence interval, 1.17-6.28). The burden was especially high among subjects between 45 and 54 years old with degenerative disc disease (rate ratio, 7.45).

CONCLUSION

Analgesic-related deaths are responsible for more deaths and more potential life lost among workers who underwent lumbar fusion than any other cause. Risk of analgesic-related death was especially high among young and middle-aged workers with degenerative disc disease.

Unintentional drug overdose death trends in New Mexico, USA, 1990-2005: combinations of heroin, cocaine, prescription opioids and alcohol

AIMS

To determine the contribution of heroin, prescription opioids, cocaine and alcohol/drug combinations to the total overdose death rate and identify changes in drug overdose patterns among New Mexico subpopulations.

DESIGN

We analyzed medical examiner data for all unintentional drug overdose deaths in New Mexico during 1990-2005. Age-adjusted drug overdose death rates were calculated by sex and race/ethnicity; we modeled overall drug overdose death adjusting for age and region.

FINDINGS

The total unintentional drug overdose death rate in New Mexico increased from 5.6 per 100 000 in 1990 to 15.5 per 100 000 in 2005. Deaths caused by heroin, prescription opioids, cocaine and alcohol/drug combinations together ranged from 89% to 98% of the total. Heroin caused the most deaths during 1990-2005, with a notable rate increase in prescription opioid overdose death during 1998-2005 (58%). During 1990-2005, the 196% increase in single drug category overdose death was driven by prescription opioids alone and heroin alone; the 148% increase in multi-drug category overdose death was driven by heroin/alcohol and heroin/cocaine. Hispanic males had the highest overdose death rate, followed by white males, white females, Hispanic females and American Indians. The most common categories causing death were heroin alone and heroin/alcohol among Hispanic males, heroin/alcohol among American Indian males and prescription opioids alone among white males and all female subpopulations.

CONCLUSIONS

Interventions to prevent drug overdose death should be targeted according to use patterns among at-risk subpopulations. A comprehensive approach addressing both illicit and prescription drug users, and people who use these drugs concurrently, is needed to reduce overdose death.

Surveillance of prescription drug-related mortality using death certificate data

BACKGROUND

The prescription drugs or drug classes that are most frequently associated with death in the US might be identifiable from death certificate data.

OBJECTIVE

To identify the drugs/drug classes associated with the greatest numbers of deaths in the US that might be considered as possible targets for prevention.

STUDY DESIGN

US vital statistics data were accessed in order to identify International Classification of Diseases (10th Revision) [ICD-10] codes indicating that prescription drugs had caused or contributed to death and diseases with significant drug-related mortality.

MAIN OUTCOME MEASURE

ICD-10 codes for primarily prescription drugs that were listed as the underlying cause or as 'total mentions' on death certificates and were implicated in >or=1000 deaths in any one year were selected. The annual number of deaths by ICD-10 code was obtained from the Division of Vital Statistics, National Center for Health Statistics. Codes for diseases with significant drug-related aetiologies and involvement in >or=1000 deaths in any one year were also identified and analysed separately.

RESULTS

For the selected ICD-10 codes, a total of 25 031 deaths were listed as having a prescription drug as the underlying cause in 2003, compared with 16 135 in 1999, a 55% increase. Total mentions of these codes increased from 46 523 in 1999 to 72 080 in 2003, also a 55% increase. Most codes involved 'poisonings' (overdose or the wrong substance given or taken in error that is accidental, intentional or with undetermined intent). Drugs associated with poisoning deaths had central nervous system effects. Among the codes associated with specified drug classes, poisonings and accidental poisonings involving narcotics, hallucinogens, psychoactive substances and opioids (other than opium and heroin) were associated with the largest numbers of deaths. Drug-related codes associated with the largest percentage increases in deaths between 1999 and 2003 included poisoning due to methadone (275%); poisoning by other and unspecified antidepressants (primarily selective serotonin reuptake inhibitors) [130%]; and poisoning by psychostimulants with potential for abuse (amfetamines and drugs for attention deficit hyperactivity disorder) [117%]. Anticoagulants were associated with the largest numbers of deaths with codes involving "adverse effects in therapeutic use". Among diseases with significant drug-related aetiologies, Clostridium difficile enterocolitis (associated primarily with antibacterials) had the largest percentage increase in total mentions, with a 203% rise between 1999 and 2003.

CONCLUSIONS

Deaths due to overdoses are the most prominent cause of drug-related mortality in death certificate data. Certain drugs and drug classes, especially the opioids (e.g. narcotics, methadone), psychoactive drugs (e.g. antidepressants, amfetamines), anticoagulants and antibacterials (which cause or contribute to C. difficile enterocolitis) are associated with large and increasing numbers of deaths and preventive strategies should be considered.