Three leading suicide methods in the United States, 2017-2019: Associations with decedents' demographic and clinical characteristics

Exploring spatial dynamics of trauma and substance use among suicide deaths in the United States (2017-2021)

BACKGROUND

Suicide remains a significant cause of death in the United States. Traumatic events, such as experiences of violence, financial loss, and mental illness, significantly increase an individual's risk of suicide. Substance use, often used as a coping mechanism for trauma, frequently occurs alongside these events. Geographic patterns of trauma and substance use may reveal underlying factors that contribute to suicide rates across the nation.

METHODS

Data from the National Violent Death Reporting System (NVDRS), collected between 2017 and 2021, was used to examine spatial relationships between traumatic events and substance use among suicides. Spatial autocorrelation was used to assess global spatial dependence of traumatic events among suicide deaths. Additionally, hot spot analyses were conducted to pinpoint regions with significantly elevated or reduced experiences of trauma. Colocation analyses were conducted to identify areas where traumatic events and substance use co-occur spatially.

RESULTS

Traumatic events among suicides exhibited geographic clustering. Spatial clusters of traumatic events were identified in specific regions across the U.S. and its territories. Hot spots were predominantly observed in Western and Midwestern areas, while more cold spots were found in Southern regions. Additionally, colocation analysis revealed that Midwestern counties had a higher likelihood of experiencing traumatic events in conjunction with substance use history among suicide decedents.

CONCLUSION

Clustering patterns may provide insight on underlying mechanisms that have significant impacts on suicide outcomes. The colocation analysis helps reveal patterns of spatial clustering, shedding light on potential risk factors or shared characteristics in those areas. By examining both global and local spatial patterns, researchers gain insights into the distribution of trauma and substance use-related incidents and their association with suicide.

Suicide by ligature strangulation and/or hanging inside a motor vehicle: a comprehensive review

Suicide by ligature strangulation/hanging inside vehicles is uncommon, and only few cases have been reported in the literature. This study aimed to conduct a comprehensive review of reported cases of suicide by ligature strangulation/hanging inside vehicles, analyzing the features of the death scene, of the ligature and furrow, autopsy findings, and causes of death. The comprehensive review was performed following the PRISMA guidelines by using the most common scientific databases. According to inclusion criteria, a total of 20 cases of vehicle-assisted strangulation/hanging were reviewed: 13 cases were assessed as ligature strangulation resulting in 7 complete decapitations and 7 other cases as hanging. All victims were young or adult males, except for one 48-year-old female. Death was assessed as suicide in all cases, except for a possible accidental autoerotic death. In 8 cases, a history of depression or other psychiatric disorders was reported. Toxicological analysis were positive in 7 cases. Hard ligature materials (nylon, steel, plastic, hemp ropes) were used in most cases, but only 13 cases had a well-demarcated furrow. In 2 cases, no internal findings of asphyxia were found. An additional case of ligature strangulation inside a motor vehicle off is also presented, where no autopsy findings of asphyxia were observed, except for a broad pale furrow and monolateral conjunctival petechiae. This study highlights the challenges in classifying suicidal hanging and ligature strangulation in motor vehicles.

Comparing substance-involved suicide and unintentional deaths from 2011 to 2021 in Missouri, United States

Background: Substance-involved suicide and unintentional overdose deaths share risk factors, yet our understanding of how these deaths overlap and differ remains limited. Direct comparisons of substance-involved suicide and unintentional deaths are lacking.Objective: To guide effective prevention and intervention efforts regarding substance-involved suicide, we examined risk factors, demographic and substance-related, of substance-involved suicide and unintentional deaths.Methods: Using logistic and multinomial regression, we used medical examiner records obtained annually (N = 6,467, 72% male) to examine characteristics associated with suicide and unintentional substance-involved deaths in St. Louis, Missouri between 2011 and 2021.Results: Between 2011 and 2021, age-standardized suicide rates slightly decreased (3.55 to 3.33), while unintentional deaths nearly tripled (23.2 to 68.2). Many deaths involved both alcohol and traumatic injury, and almost a fifth of suicides involved prescription opioids. In the logistic model (combining data across 11 years), the following factors were associated with increased odds of suicide, relative to unintentional deaths: White race (OR = 5.42, 95%CI[3.95,7.56]), greater age (OR = 1.01, 95%CI[1.00,1.02]), traumatic injury (OR = 4.40, 95%CI[3.17,6.13]), and presence of not otherwise classified substances (including prescription medications; OR = 4.36, 95%CI[3.11,6.10]). The following were associated with decreased odds of suicide: presence of medical condition (OR = 0.32, 95%CI[0.23,0.45]), fentanyl (OR = 0.04, 95%CI[0.02,0.06]), ethanol (OR = 0.64, 95%CI[0.46,0.88]), cocaine (OR = 0.40, 95%CI[0.24,0.63]), heroin (OR = 0.05, 95%CI[0.03,0.09]), and other stimulants (OR = 0.32, 95%CI[0.20,0.50]).Conclusions: Results suggest a divergence over time in the rates of classified substance-involved suicide and unintentional deaths. A distinctive set of demographic and substance use characteristics differentiated the two manners of death, highlighting potential risk factors to inform further research and targeted interventions.

Pharmacist gatekeeper interventions for suicide prevention: how evidence from developed countries support their role in low- and middle-income countries

Background

Approximately 70% of self-poisoning suicides occur in low- and middle-income countries (LMICs).The implementation of pesticide bans has significantly reduced the rate of pesticide self-poisoning in these regions; however, this has been accompanied by a shift toward an increased incidence of pharmaceutical poisoning, highlighting the importance of intervention strategies to prevent pharmaceutical self-poisoning in the future. This report summarizes the existing evidence on community pharmacist gatekeeper interventions aimed at reducing pharmaceutical suicide to discuss their complementary role with pesticide bans in LMICs.

Methods

The literature review identified studies published between April 2014 and April 2024 using multiple keywords related to "suicide," "intervention," "pharmacist" and "gatekeeper" in various library databases. Data were extracted into a table for analysis.

Results

Only eight relevant studies were found during the search period, and none quantified the impact of pharmacy gate keeper interventions. Community pharmacists became more confident and willing to intervene after pharmacist gatekeeper training. They demonstrated positive attitudes and improved knowledge and skills in responding to suicidal intent. However, the evidence supporting community pharmacy gatekeeper interventions primarily comes from developed countries. Furthermore, the role of pharmacists in preventing suicide relies on frequent contact between suicidal individuals and pharmacies in developed countries.

Conclusion

Pharmacy gatekeeper interventions can be implemented in LMICs as a complement to pesticide bans, provided they are modified and adapted to suit the specific context of these regions. Further research is essential to tailor and implement successful strategies from developed countries to address the unique challenges faced by LMICs.

Early Markers in Severe Organophosphorus Poisoning and Their Association with Mortality

BACKGROUND

Organophosphorus (OP) poisoning, in addition to its cholinergic manifestations, shows metabolic derangements leading to acidosis, hypokalemia, hyperlactemia, and hyperglycemia. In addition to low acetylcholinesterase, these markers could serve as early predictors of severity of poisoning and mortality.

OBJECTIVE

The objective of this study was to assess the metabolic parameters at presentation in OP poisoning and their association with mortality.

METHODS

This was a prospective study that recruited 152 patients older than 14 years with a history of OP ingestion within 6 h of presentation.

RESULTS

In this study, 11 (6 male and 5 female) of 152 patients died (mortality rate 7.2%).. Mean age of the patients who died was 47 years and mean age of those who survived was 29 years. Ten of 11 patients (90%) who died had fasciculations at presentation. Metabolic parameters that were abnormal at presentation with significant correlation with mortality were acidosis (pH < 7.35) in 8 of 11 patients who died (72.7%) compared with 27.7% in those who survived. Hyperlactemia with serum lactate > 2 mmol/L was seen in 10 of 11 patients (90.1%) who died during hospital stay compared with 39% of patients who survived. Hypokalemia with potassium < 3.5 mmol/L was seen in 8 of 11 patients who died (72.7%) compared with 34.7% of those who survived.

CONCLUSIONS

Hypokalemia, hyperlactemia, hyperglycemia, fasciculations, and advanced age are early markers predicting poor outcomes in OP poisoning.

Substitution of Methods in Suicide Deaths - Firearm Injury and Hanging

Background: Prevention strategies for suicide emphasize restrictions on firearm access. These restrictions may lose efficacy if individuals substitute other lethal suicide methods. Aims: The objective of this study is to determine the extent to which individuals who die by suicide in the United States substitute hanging for firearm injury. Methods: This study is a repeated cross-sectional analysis of suicide deaths in the United States from 2003 to 2021. Multiple regression was used to estimate the effect of firearm access proxies on individual suicide methods (hanging vs. firearm injury). Results: The probability of death by hanging was significantly and negatively associated with proxies of firearm access. Limitations: This study does not compare crude rates of suicide by state, which rise on average with rates of firearm ownership. The National Violent Death Reporting System expanded over the sample period, so early years have incomplete ascertainment. Rates of gun ownership and gun safety law scales are measured as proxies. Conclusions: Although means restriction around firearm access is a critical tool for suicide prevention, complementary strategies for prevention around hanging merit further study.

Suicide by Gunshot Wound to the Posterior Head and Neck: A Retrospective Case Series and Review of the Literature

ABSTRACT

Suicide by firearm is a significant public health concern in specific regions of the world. Depending on firearm availability, any type of firearm may be used, including handguns, shotguns, and long rifles. Common entrance wound sites in suicidal gunshot wounds include the head, with classic gunshot wound locations including the temple, the forehead, the submental aspect of the chin, and inside the mouth. Occasionally, suicidal gunshot wounds occur in atypical body locations such as the back of the head and neck. Given their relative rarity, suicidal gunshot wounds in these regions may be mistaken for homicides. In this report, we present 5 cases of suicidal gunshot wounds to the back of the head and/or neck. In our series, we focus on differentiating each case from homicides involving gunshot wounds in similar areas of the head and neck.

Depression in older women who died by suicide: associations with other suicide contributors and suicide methods

Suicides among older women have received little research attention. In this study based on the 2017-2019 National Violent Death Reporting System data, we examined the prevalence of depression in older female suicide decedents (N = 3,061), associations between depression and other suicide precipitants, and the associations between suicide methods and depression. Descriptive statistics and generalized linear models (GLM) for a Poisson distribution with a log link were used to examine the research questions. Of the decedents, 15.0% had depressed mood without a reported diagnosis and 41.8% had a depression diagnosis. Nearly one-half of the decedents with reported depression were receiving mental health/substance use treatment at the time of injury. The likelihood of depression was lower among those who were age 85 and older compared to those were age 65-74, but higher among those who had anxiety disorder (IRR = 1.50, 95% CI = 1.33-1.69), history of suicidal ideation (IRR = 1.22, 95% CI = 1.10-1.35), history of suicide attempt (IRR = 1.27, 95% CI = 1.14-1.41), and bereavement problems (IRR = 1.45, 95% CI = 1.27-1.65). Those who had depression were less likely to have used firearms (IRR = 0.85, 95% CI = 0.75-0.97) but more likely to have used hanging/suffocation (IRR = 1.37, 95% CI = 1.13-1.67). The findings show that gun ownership was likely an important factor for firearm use. The high prevalence of depressed mood and/or depression diagnosis among older female suicide decedents at the time of their fatal injury underscores the importance of assessing depression and providing evidence-based depression treatment as an essential suicide prevention approach.

Intentional benzodiazepine poisoning in older adults reported to United States Poison Centers

INTRODUCTION

Despite known contraindications, benzodiazepines are frequently prescribed for older adults. This study utilizes poison control center data on benzodiazepine-involved cases aged 50 and above to compare the characteristics of suspected suicide attempt with other intentional misuse cases. We also examined associations of major medical outcomes (major effect/death) with demographic characteristics and other co-used substances in each group.

METHODS

The study employed data from the America's Poison Center National Poison Data System from 2015-2022. Descriptive statistics and binary logistic regression models were used.

RESULTS

Of the benzodiazepine-poisoning cases of intentional misuse (n = 93,245), 85 percent were suicide attempts and 15 percent were other intentional misuses. Reports to poisons centers showed a decline from 2019-2022 when compared to 2015-2016. However, the likelihood of a reported suicide attempt, compared to other intentional misuse, was greater in 2019-2022 compared to 2015-2016 and among those who co-used antidepressants, anxiolytics, atypical antipsychotics, other benzodiazepines, other analgesics, anticonvulsants, and alcohol. The odds of major effect/death in both groups were also greater in 2019-2022, with suicide attempt cases in advanced ages showing higher odds. The co-use of antidepressants, prescription opioids, atypical antipsychotics, anticonvulsants, and other analgesics were associated with a higher likelihood of major effect/death in both exposure groups. For instance, adjusted odds ratios for co-used prescription opioids were 2.20 (95 percent confidence intervals: 2.09-2.31) among suicide attempt cases and 3.51 (95 percent confidence intervals: 3.10-3.97) among other intentional misuse cases.

DISCUSSION

Healthcare providers need to screen for suicidal ideation among benzodiazepine users, with special attention to an increased risk of suicide attempt among those who co-use antidepressants and opioids and to decreasing adverse outcomes in all misuse cases. Assessments of underlying mental health and substance use problems and medication regimens to minimize polypharmacy and drug interactions are needed to reduce adverse outcomes.

CONCLUSIONS

Though the numbers of benzodiazepine-involved suicide attempt and other intentional misuse cases reported to United States poison centers decreased in recent years, the likelihood of major medical effect/death among these cases have increased.

Firearm use risk factors and access restriction among suicide decedents age 75 and older who disclosed their suicidal intent

Background and aims

A majority of older adult suicide decedents used firearms. In this study, we focused on suicide decedents age 75+ who disclosed their suicidal intent within a month of their injury/death to examine demographic and clinical characteristics associated with firearm use and firearm access restriction attempts by their family members.

Methods

The 2017-2019 U.S. National Violent Death Reporting System provided data (N = 1,734 suicidal intent disclosers; 1,476 males and 258 females; 21.4% of decedents age 75+). Generalized linear model (GLM) for a Poisson distribution with a log link was used to examine firearm use risk factors. Firearm access restriction attempts by decedents' family members were examined based on coroner/medical examiner and law enforcement (CME/LE) reports.

Results

Nearly three quarters of disclosers disclosed their intent to family members, and 82.9% of males and 27.5% of females used firearms. GLM results showed males, non-Hispanic white people, and residents in the South and West regions had higher likelihood of firearm use. CME/LE reports of 140 out of 1,294 firearm decedents included narratives related to firearm restriction attempts or lack thereof. Firearm access restrictions were not attempted in 65 cases because family members did not take suicidal intent disclosure seriously or because decedents promised no self-harm. Partial or complete removal of firearms in 75 cases were not effective as decedents had hidden a firearm or purchased a new one. Others used different lethal methods.

Implications

The findings indicate a need for: (a) training family members of older adults who are at risk of suicide in effective means safety/access restriction and strategies to prevent means substitution; (b) more comprehensive legislative reforms reducing access to firearms by those at risk of suicide; and (c) more comfort and palliative care and counseling for psychosocial risk factors.

Individual-level risk factors for suicide mortality in the general population: an umbrella review

BACKGROUND

Deaths by suicide remain a major public health challenge worldwide. Identifying and targeting risk factors for suicide mortality is a potential approach to prevention. We aimed to summarise current knowledge on the range and magnitude of individual-level risk factors for suicide mortality in the general population and evaluate the quality of the evidence.

METHODS

In this umbrella review, five bibliographic databases were systematically searched for articles published from database inception to Aug 31, 2022. We included meta-analyses of observational studies on individual-level risk factors for suicide mortality in the general population. Biological, genetic, perinatal, and ecological risk factors were beyond the scope of this study. Effect sizes were synthesised and compared across domains. To test robustness and consistency of the findings, evidence for small-study effects and excess significance bias (ie, the ratio between the overall meta-analysis effect size and that of its largest included study) was examined, and prediction intervals were calculated. Risk of bias was assessed by the Risk of Bias in Systematic Reviews instrument. The protocol was pre-registered with PROSPERO (CRD42021230119).

FINDINGS

We identified 33 meta-analyses on 38 risk factors for suicide mortality in the general population. 422 (93%) of the 454 primary studies included in the meta-analyses were from high-income countries. A previous suicide attempt and suicidal ideation emerged as strong risk factors (with effect sizes ranging from 6 to 16). Psychiatric disorders were associated with a greatly elevated risk of suicide mortality, with risk ratios in the range of 4-13. Suicide risk for physical illnesses (such as cancer and epilepsy) and sociodemographic factors (including unemployment and low education) were typically increased two-fold. Contact with the criminal justice system, state care in childhood, access to firearms, and parental death by suicide also increased the risk of suicide mortality. Among risk factors for which sex-stratified analyses were available, associations were generally similar for males and females. However, the quality of the evidence was limited by excess significance and high heterogeneity, and prediction intervals suggested poor replicability for almost two-thirds of identified risk factors.

INTERPRETATION

A wide range of risk factors were identified across various domains, which underscores suicide mortality as a multifactorial phenomenon. Prevention strategies that span individual and population approaches should account for the identified factors and their relative strengths. Despite the large number of risk factors investigated, few associations were supported by robust evidence. Evidence of causal inference will need to be tested in high-quality study designs.

FUNDING

Wellcome Trust.

Cocaine-involved suspected suicide attempts in individuals age 50 and older reported to United States Poison Centers

CONTEXT

Despite a rapidly growing number of older cocaine users, the link between cocaine use and suicide attempt in older adults has not been examined. We examined associations between co-used other substances and (1) suspected suicide attempts versus other intentional misuse, and (2) major medical outcomes (major effect or death) of suspected suicide attempts and other intentional misuse.

METHODS

We used the 2015-2021 United States National Poison Data System (N = 5,191 cases age 50 and older). Descriptive statistics and generalized linear models for a Poisson distribution with a log link function were used to examine the study questions.

RESULTS

Cocaine exposures steadily increased from 2015 through 2021. Over the seven years, 52.3% and 47.7% were suicide attempts and other intentional misuse cases, respectively. Co-use of alcohol (incidence rate ratios = 1.24, 95% confidence interval = 1.14-1.35) and psychotropic (e.g., antidepressants: incidence rate ratios = 1.37, 95% confidence interval = 1.24-1.53) and cardiovascular medications were associated with a higher likelihood of suicide attempt, but co-use of prescription opioids, heroin, or other illicit drugs was associated with a lower likelihood of suicide attempt compared to other intentional misuse. Prescription opioids and amfetamine were associated with a higher likelihood of major effect or death in both suicide attempts and intentional misuse and heroin use and injection use were associated with a higher likelihood of major effect/death among intentional misuse cases.

CONCLUSIONS

These findings show that significant proportions of older cocaine users who attempted suicide also used psychotropic and cardiovascular medications. We suggest that healthcare providers screen for suicidal ideation among cocaine users, with special attention to an increased risk of suicide attempts among those who co-use cocaine with alcohol and psychotropic and other prescription medications.