Excited Delirium Syndrome (ExDS): Defining Based on a Review of the Literature

Police arrest-related death: about four cases and review of the literature

Unexpected deaths may occur in individuals during a police arrest. These individuals usually have had both physical and emotional exertion, associated or not with agitation and restraint by police. Further investigations in these cases often show an impregnation with drugs. Autopsy findings may raise medico-legal problems in these cases.We report four cases of deaths during police arrest in which multiple factors contributed to the death. In the first two cases, there was a combination of emotional and physical stress due to police pursuit and, the presence of mechanical asphyxia. We noticed the presence of cannabis and amphetamine; however, we couldn't relate the death to a drug intoxication. In the third case, the deceased lost consciousness when he was arrested by the police with no link to the intervention of law enforcement authorities. Death in this case was due to sepsis complicating endocarditis. The fourth case reports a rare cause of asphyxia that can occur in a police arrest related to a drug package. Death was due to upper airway obstruction in this case.The forensic pathologist should take into consideration every factor when explaining these deaths. Thorough autopsy and investigations are critical to understand the cause and circumstances of death.

Use of Term Excited Delirium in State EMS Protocols Over Time

This cross-sectional study investigates changes in use of the term excited delirium in state emergency medical services (EMS) protocols after professional society statements condemning the term.

Bodies of evidence: The 'Excited Delirium Syndrome' and the epistemology of cause-of-death inquiry

"Excited Delirium Syndrome" (ExDS) is a controversial diagnosis. The supposed syndrome is sometimes considered to be a potential cause of death. However, it has been argued that its sole purpose is to cover up excessive police violence because it is mainly used to explain deaths of individuals in custody. In this paper, we examine the epistemic conditions giving rise to the controversial diagnosis by discussing the relation between causal hypotheses, evidence, and data in forensic medicine. We argue that the practitioners' social context affects causal inquiry through background assumptions that enter inquiry at multiple stages. This analysis serves to better understand the wide usage of the controversial diagnosis of ExDS.

Hyperactive Delirium with Severe Agitation

Hyperactive delirium with severe agitation is a clinical syndrome of altered mental status, psychomotor agitation, and a hyperadrenergic state. The underlying pathophysiology is variable and often results from sympathomimetic abuse, psychiatric disease, sedative-hypnotic withdrawal, and metabolic derangement. Patients can go from a combative state to periarrest with little warning. Safety of the patient and of the medical providers is paramount and the emergency department should be prepared to manage these patients with adequate staffing, restraints, and pharmacologic sedatives. Treatment with benzodiazepines, antipsychotics, or ketamine is recommended, followed by airway protection, supportive measures, and cooling of hyperthermia.

In pursuit of inter-specialty consensus on excited delirium syndrome: a scoping literature review

Excited delirium syndrome (ExDS) is a controversial and disputed diagnosis involving altered mentation, agitation, and, frequently, substance abuse. Recently, it has become a common pre-hospital diagnosis, serving as justification for use of force, restraint, and/or medication administration. To conduct a scoping review across three databases to describe the most frequently reported diagnostic criteria for ExDS, as well as to explore its use as a diagnosis for deaths of individuals in the custody of law enforcement. In 2021, three literature databases were searched: Ovid Medline, PsycInfo, and Scopus. Studies were included if they were peer-reviewed, English articles describing (1) ExDS symptoms, (2) substance intoxication with at least 2 ExDS symptoms present, or (3) centering on deaths occurring in the custody of law enforcement and attributed to ExDS. Key study data were extracted and the current literature was described qualitatively. Analysis took place between March and December 2021. A total of 97 studies were identified through initial abstract and secondary full-text review, with noted discrepancies in the definition of ExDS itself. After review, differences in ExDS diagnosis among organizations were explored, along with subsequent clinical impact, particularly in the pre-hospital setting. Resulting impact on patients, particularly those of minoritized ethnic and racial groups, was also noted. Prone aggressive restraint, in particular, is noted as an established risk factor for fatalities in ExDS cases. At this time, ExDS should not be utilized as a diagnosis; major medical organizations have an urgent responsibility to convene to formalize consensus-based diagnostic criteria or to propose alternate management guidelines for agitated and altered persons.

A retrospective cohort study of pre-hospital agitation management by advanced paramedic practitioners in critical care

Introduction: Pre-hospital clinicians can expect to encounter patients with agitation, including acute behavioural disturbance (ABD). These situations carry significant risk for patients and emergency medical services. Advanced paramedics within the London Ambulance Service (LAS) are frequently tasked to these incidents. At present, little evidence exists regarding clinical decision-making and management of this patient group. We sought to explore the demographics of patients presenting with potential ABD and quantify the degree of agitation, physical restraint, effectiveness of chemical sedation and any associated complications.Methods: A retrospective analysis of pre-hospital clinical records for patients coded with ABD and attended by LAS advanced paramedics between 1 October 2019 and 30 September 2020. Sedation assessment tool (SAT) scores were used as the primary outcome measure.Results: A total of 237 patient records were identified. Of the patients, 147 (62%) were physically restrained and 104 (44%) were chemically sedated. Sedation was more commonly administered where patients were exposed to physical restraint. High SAT scores were associated with the administration of sedative agents and at higher doses. Of patients undergoing sedation, 89 (85%) had a SAT score reduction of 2 points or a final score ≤ 0. The mean SAT score reduction was 2.72. Three cases of minor injury were reported following physical restraint.Conclusion: Advanced paramedics undertook sedation in less than half the cohort, suggesting that other strategies such as communication and positioning were utilised. Most patients were managed into a state between being restless and rousable, largely negating the need for ongoing physical restraint during hospital transfer. Appropriately trained advanced paramedics can utilise sedation safely and effectively in selected cases.

Restraint asphyxia. An analysis of the circumstances and mechanism of death in agitated, physically restrained individuals

W ostatnich latach media coraz częściej poruszane są przypadkami śmierci młodych zazwyczaj osób, w trakcie zatrzymywania przez policję. Śmierć w tych przypadkach dotyka zazwyczaj osoby pobudzone psychoruchowo, obezwładniane z użyciem siły, a badania pośmiertne nie wykazują jednoznacznej urazowej przyczyny zgonu. Celem pracy jest próba ustalenia mechanizmu i okoliczności zgonów w trakcie obezwładniania osób pobudzonych psychoruchowo. Analizie poddano przypadki opiniowane od 2010 roku, zarówno jako sekcje zwłok, jak i oceniane na podstawie materiału aktowego. W analizowanym okresie ZMS w Krakowie wydał opinie w 10 tego typu przypadkach, w dziewięciu na podstawie własnych sekcji zwłok, w jednym na podstawie materiału aktowego. We wszystkich nastąpiło nagłe zatrzymanie krążenia lub utrata przytomności, a resuscytacja okazywała się nieskuteczna. W sześciu przyczyną pobudzenia była ostra psychoza, w czterech działanie narkotyków, zazwyczaj w wysokim stężeniu. Tylko w pięciu przypadkach stwierdzono obecność wybroczyn w spojówkach. Najbardziej prawdopodobną przyczyną śmierci było współistnienie nasilonego wysiłku fizycznego spowodowanego patologicznym pobudzeniem psychoruchowym, z przymusowym unieruchomieniem pogarszającym funkcjonowanie układu oddechowego. Mechanizm ten jest określany jako asfiksja restrykcyjna. Restraint asphyxia. An analysis of the circumstances and mechanism of death in agitated, physically restrained individuals Recent years saw frequent media reports of young people who die while they are being arrested by the police. Death in these circumstances affects people who are agitated and restrained with the use of force, with their autopsies indicating no unequivocally traumatic cause of death. The goal of this study was to identify the mechanism and circumstances of sudden deaths in agitated individuals who are being restrained. Ten cases evaluated at our center since 2010 were included in this study: nine involved forensic postmortem examination and one involved casefile analysis. In each case there was sudden cardiac arrest or at least a loss of consciousness, and the cardiopulmonary resuscitation proved ineffective. In six cases the cause of agitation was acute psychosis, in four it was an effect of narcotics, usually in high concentration. Conjunctival petechiae were detected in only five cases. The most probable cause of death in the evaluated cases was the combination of physical exertion caused by pathological psychomotor agitation and forcible restraint, hindering the function of the respiratory system. This mechanism is known as restraint asphyxia.

'Excited Delirium', acute behavioural disturbance, death and diagnosis

In the 1980s the traditional Hippocratic term excited delirium was transplanted from the bedsides of febrile, agitated and disoriented patients to the streets of Miami. Deaths in custody of young men who were intoxicated with cocaine and who were restrained by the police because of their erratic or violent behaviour were attributed to excited delirium. The blood concentrations of cocaine in these subjects were approximately ten times lower than the lethal level and other factors which might have contributed to the fatal outcome, such as the police use of neck-holds, choke-holds or 'hog-tying', were relegated to a minor role compared with the reframed 'diagnosis' of excited delirium. Over the course of the next few decades 'excited delirium' might be applied to virtually any highly agitated person behaving violently in a public place and who subsequently died in custody while being restrained or shortly afterwards. Expert witnesses, mainly forensic pathologists, testified that the deceased's death was probably inevitable given the perilous nature of excited delirium, even though this diagnostic entity lacked any consistent neuropathological basis and depended entirely on observed behaviour. This history of the rise and fall of this disputed diagnosis is a partial response to the sociologist Phil Brown's 1995 paper asking who benefits, or at least avoids trouble, by the identification and use of a diagnosis.

Heart rate variability and delirium in acute non-cardioembolic stroke: a prospective, cross-sectional, cohort study

OBJECTIVES

Delirium is an acute fluctuating disorder of attention and awareness. It is associated with autonomic dysfunction and increased mortality. The primary endpoint of our study was to measure autonomic activity in acute stroke patients, by means of heart rate variability analysis, in order to identify autonomic modifications that can predispose to delirium.

METHODS

Patients were consecutively enrolled from the stroke unit. Inclusion criteria were age ≥ 18 years and diagnosis of stroke with onset within the previous 72 h confirmed by neuroimaging. Exclusion criteria were atrial fibrillation, congestive heart failure, and conditions requiring intensive care unit. Patients were evaluated by means of Richmond Agitation Sedation Scale (RASS) and Confusion Assessment Method-Intensive Care Unit (CAM-ICU) at baseline, after 72 h, or when symptoms suggesting delirium occurred. For each patient, ECG was recorded at baseline assessment and HRV analysis was conducted on five consecutive minutes of artifact-free ECG traces.

RESULTS

Fifty-six ECGs were available for analysis. During the study period, 11 patients developed delirium. Patients with and without delirium did not differ for sex, age, severity of stroke, and comorbidities. The delirium group had greater standard deviation of the heart rate (DLR - :9.16 ± 8.28; DLR + : 14.36 ± 5.55; p = 0.026) and lower power spectral density of the HF component (DLR - : 38.23 ± 19.23 n.u.; DLR + : 25.75 ± 8.77 n.u.; p = 0.031).

CONCLUSIONS

Acute non-cardioembolic stroke patients with increased variability of heart rate and decreased vagal control are at risk for delirium.

Prehospital Ketamine Administration for Excited Delirium with Illicit Substance Co-Ingestion and Subsequent Intubation in the Emergency Department

Introduction:

Excited delirium, which has been defined as combativeness, agitation, and altered sensorium, requires immediate treatment in prehospital or emergency department (ED) settings for the safety of both patients and caregivers. Prehospital ketamine use is prevalent, although the evidence on safety and efficacy is limited. Many patients with excited delirium are intoxicated with illicit substances. This investigation explores whether patients treated with prehospital ketamine for excited delirium with concomitant substance intoxication have higher rates of subsequent intubation in the ED compared to those without confirmed substance usage.

Methods:

Over 28 months at two large community hospitals, all medical records were retrospectively searched for all patients age 18 years or greater with prehospital ketamine intramuscular (IM) administration for excited delirium and identified illicit and prescription substance co-ingestions. Trained abstractors collected demographic characteristics, history of present illness (HPI), urine drug screens (UDS), alcohol levels, and noted additional sedative administrations. Substance intoxication was determined by UDS and alcohol positivity or negativity, as well as physician HPI. Patients without toxicological testing or documentation of substance intoxication, or who may have tested positive due to ED sedation, were excluded from relevant analyses. Subsequent ED intubation was the primary pre-specified outcome. Odds ratios (OR) and 95% confidence intervals (CI) were calculated to compare variables.

Results:

Among 86 patients given prehospital ketamine IM for excited delirium, baseline characteristics including age, ketamine dose, and body mass index were similar between those who did or did not undergo intubation. Men had higher intubation rates. Patients testing positive for alcohol, amphetamines, barbiturates, benzodiazepines, ecstasy, marijuana, opiates, and synthetic cathinones, both bath salts and flakka, had similar rates of intubation compared to those negative for these substances. Of 27 patients with excited delirium and concomitant cocaine intoxication, nine (33%) were intubated compared with four of 50 (8%) without cocaine intoxication, yielding a 5.75 OR (95%, CI 1.57 to 21.05; P = .009).

Conclusion:

Patients treated with ketamine IM for excited delirium with concomitant cocaine intoxication had a statistically significant 5.75-fold increased rate of subsequent intubation in the ED. Amongst other substances, no other trends with intubation were noted, but further study is warranted.

Medical Care in a Police Intervention with Conducted Electrical Weapons: Zaragoza (Spain) Fire Department Protocol

In the last decade, conducted electrical weapons (CEWs) have become a new tool for law enforcement agencies as an alternative to firearms. They provide security in the intervention for both the police and the citizen and try to cause the least possible harm to the subject to immobilize.The health care providers who perform in joint actions with the police in which CEWs are used should be aware of how they work, risk groups, as well as the most frequent clinical effects associated with the application of electrical discharge, and the complications that can be produced according to the area of impact of the electrodes.For this purpose, the current medical literature was reviewed by consulting the main health care sciences database (PubMed) to determine the medical measures to be taken before, during, and after the use of these weapons. Also presented and shared is the Zaragoza (Spain) Fire Department protocol.

Rapid Agitation Control With Ketamine in the Emergency Department: A Blinded, Randomized Controlled Trial

STUDY OBJECTIVE

We hypothesized that the use of intramuscular ketamine would result in a clinically relevant shorter time to target sedation.

METHODS

We conducted a randomized clinical trial comparing the rapidity of onset, level of sedation, and adverse effect profile of ketamine compared to a combination of midazolam and haloperidol for behavioral control of emergency department patients with severe psychomotor agitation. We included patients with severe psychomotor agitation measured by a Richmond Agitation Score (RASS) ≥+3. Patients in the ketamine group were treated with a 5 mg/kg intramuscular injection. Patients in the midazolam and haloperidol group were treated with a single intramuscular injection of 5 mg midazolam and 5 mg haloperidol. The primary outcome was the time, in minutes, from study medication administration to adequate sedation, defined as RASS ≤-1. Secondary outcomes included the need for rescue medications and serious adverse events.

RESULTS

Between June 30, 2018, and March 13, 2020, we screened 308 patients and enrolled 80. The median time to sedation was 14.7 minutes for midazolam and haloperidol versus 5.8 minutes for ketamine (difference 8.8 minutes [95% confidence interval (CI) 3.0 to 14.5]). Adjusted Cox proportional model analysis favored the ketamine arm (hazard ratio 2.43, 95% CI 1.43 to 4.12). Five (12.5%) patients in the ketamine arm and 2 (5.0%) patients in the midazolam and haloperidol arm experienced serious adverse events (difference 7.5% [95% CI -4.8% to 19.8%]).

CONCLUSION

In ED patients with severe agitation, intramuscular ketamine provided significantly shorter time to adequate sedation than a combination of intramuscular midazolam and haloperidol.

Use of intramuscular ketamine by paramedics in the management of severely agitated patients

OBJECTIVE

Administration of a sedative agent is required for safe transport of prehospital patients with severe agitation to EDs. Ambulance services in Australasia use ketamine, droperidol or midazolam as first line agent but the optimal agent is uncertain. In Victoria, intramuscular (IM) ketamine is used. The present study aimed to examine the prehospital characteristics and ED outcomes of patients with severe agitation after IM ketamine administration.

METHODS

A retrospective review was conducted for patients who received IM ketamine for severe agitation over a 2-year period. Data were sourced from Ambulance Victoria and linked to hospital data. The primary outcome was time to sedation. Data collected included baseline characteristics, adverse events and ED outcomes.

RESULTS

Three hundred and fifty-eight prehospital cases transported to 32 hospitals were included. Outcome data were available for 305 patients (21 hospitals). Median age was 31 years (IQR 23-40). 71.2% were male. Adequate sedation was achieved in 96.9% of cases in a median time of 5.0 min (IQR 3.0-7.0; range 1-31 min). Adverse events were transient hypoxia (5.0%), hyper-salivation (4.2%) and emergence reactions (0.8%). A total of 45 (14.8%) patients were intubated; two prehospital.

CONCLUSION

Intramuscular ketamine is effective with a low rate of prehospital complications in severely agitated patients in the prehospital setting. Given the variation in ambulance practice in Australasia, prospective, randomised trials in the prehospital setting comparing ketamine to other sedating agents such as droperidol in patients with severe agitation are required.

Human Health Risks of Conducted Electrical Weapon Exposure: A Systematic Review

IMPORTANCE

Conducted electrical weapons (CEWs) are used broadly as a less-lethal force option for police officers. However, there is no clear picture of the possible health risks in humans on the basis of rigorously assessed scientific evidence from the international peer-reviewed literature.

OBJECTIVE

To synthesize and systematically evaluate the strength of published evidence for an association between exposure to different models of CEWs and adverse acute as well as chronic conditions.

EVIDENCE REVIEW

Following a preregistered review protocol, the literature search strategy was based on a search of reviews published between January 1, 2000, and April 24, 2020, of PubMed, MEDLINE, EMBASE, Web of Science, PsycINFO, and Cochrane Library, as well as relevant online databases and bibliographic sources, such as reference sections of recent publications. The identified studies were independently assessed in terms of scope, relevance, methodologic bias, and quality. Peer-reviewed publications of human studies were included, using original data and with a focus on the use of taser CEWs in the context of law enforcement. Eligible studies examined clearly defined health outcomes as dependent variables following exposure to a CEW. The review followed the relevant sections of the Preferred Reporting Items for Systematic Reviews and Meta-analyses reporting guideline. A meta-analysis could not be conducted.

FINDINGS

Of the 1081 unique records screened, 33 relevant studies were identified, all of them of experimental design and conducted in the US. Eleven studies had a low risk of bias and 22 had a higher bias risk. Studies focused on outcomes such as physiologic stress responses, heart rate, blood pressure, arrhythmias, or cognitive performance. Independently of bias risk, the studies reported few or no acute health problems, apart from the wounds caused by the darts. Furthermore, no long-term outcomes were studied. Most of the studies were performed on healthy, physically fit individuals (eg, police officers) in a controlled setting, with short exposure duration (5 seconds). Half of the studies, mainly those with a higher risk of bias, were at least partly funded by the manufacturer.

CONCLUSIONS AND RELEVANCE

Based on the findings of the reviewed studies, the risk for adverse health outcomes due to CEW exposure can be currently estimated as low. However, most of the reviewed studies had methodologic limitations. Considering that recruited participants were not representative of the population that usually encounters a CEW deployment, it is not possible to draw conclusions regarding exposure outcomes in potentially vulnerable populations or high-risk groups, such as those under the influence of substances.

Taser use on individuals experiencing mental distress: An integrative literature review

WHAT IS KNOWN ABOUT THE SUBJECT?: People experiencing mental distress have a high rate of contact with police in community crisis events. Police use a continuum of responses when managing situations involving agitation, aggression and behavioural problems. People experiencing mental distress have been subjected to Tasers as part of the police response. Following a number of deaths and numerous reports of injuries, concerns have been raised about the safety of Tasers. WHAT THIS PAPER ADDS?: Police use of Tasers in mental health crises is relatively common. Tasers are used in a range of settings including public places, private residences and healthcare facilities. People experiencing mental distress may be subjected to more use of Tasers than the general population. WHAT ARE THE IMPLICATIONS FOR PRACTICE?: Mental health professionals need to work with police towards greater understanding of the needs of people experiencing mental distress and to promote the use of non-coercive interventions in mental health crisis events. Mental health researchers need to explore the qualitative experiences of people who are Tasered, to provide an evidence base for Taser use with people experiencing mental distress. ABSTRACT: Introduction Conducted electrical weapons, or "Tasers," are currently used by over 15,000 law enforcement and military agencies worldwide. There are concerns regarding the effectiveness, potential for harm and overuse with people experiencing mental distress. Aim To explore the literature about police use of Tasers with people experiencing mental distress. Method An integrative review was undertaken, and qualitative and quantitative analytical approaches were used. Results Thirty-one studies were included. Of all recorded usage, overall prevalence of Taser use on people experiencing mental distress was 28%. This population appears to experience higher Taser usage than the general population. Discussion There are substantial gaps in the research literature particularly with respect to the decision-making processes involved in deploying Tasers on this population and the physical and psychological consequences of Taser use in this context. Implications for practice Police use of Tasers in mental health crises is relatively common and occurs in a variety of environments including mental health settings. Mental health professionals need to work with police towards greater understanding of the needs of people with mental illness and to promote the use of non-coercive interventions in mental health crisis events.

The role of restraint in fatal excited delirium: a research synthesis and pooled analysis

The purpose of the present study was to perform a comprehensive scientific literature review and pooled data risk factor analysis of excited delirium syndrome (ExDS) and agitated delirium (AgDS). All cases of ExDS or AgDS described individually in the literature published before April 23, 2020 were used to create a database of cases, including demographics, use of force, drug intoxication, mental illness, and survival outcome. Odds ratios were used to quantify the association between death and diagnosis (ExDS vs. AgDS) across the covariates. There were 61 articles describing 168 cases of ExDS or AgDS, of which 104 (62%) were fatal. ExDS was diagnosed in 120 (71%) cases, and AgDS in 48 (29%). Fatalities were more likely to be diagnosed as ExDS (OR: 9.9, p < 0.0001). Aggressive restraint (i.e. manhandling, handcuffs, and hobble ties) was more common in ExDS (ORs: 4.7, 14, 29.2, respectively, p < 0.0001) and fatal cases (ORs: 7.4, 10.7, 50, respectively, p < 0.0001). Sedation was more common in AgDS and survived cases (OR:11, 25, respectively, p < 0.0001). The results of the study indicate that a diagnosis of ExDS is far more likely to be associated with both aggressive restraint and death, in comparison with AgDS. There is no evidence to support ExDS as a cause of death in the absence of restraint. These findings are at odds with previously published theories indicating that ExDS-related death is due to an occult pathophysiologic process. When death has occurred in an aggressively restrained individual who fits the profile of either ExDS or AgDS, restraint-related asphyxia must be considered a likely cause of the death.

Arrest-related death on the basis of a drug-induced excited delirium syndrome

AIMS

In typical arrest-related death (ARD) scenarios, the victims often show signs of excited delirium syndrome (ExDS), intoxication, exhaustion and/or suffered from a preexisting physical or psychiatrical condition, all of which could have caused or at least triggered the person's death. Since autopsy findings are very rare in such cases, a clear clinicopathologic diagnosis and thus mechanism of death is rarely found.

METHODS

We present a case of a 25-year old woman, who died while being arrested by the police. Based on the patient's medical history, autopsy findings, contradicting witness testimonies, and reliable clinical and toxicological blood parameters, the most probable diagnosis is discussed.

RESULTS

The cause of death was determined as cardiac arrest subsequent to a combination of excited delirium syndrome, physical exhaustion and respiratory impairment. The manner of death was unnatural and juridically, the charges were dropped.

CONCLUSIONS

In cases, where the cause and mechanism of death can only be diagnosed by exclusion, police collaboration, detailed clinical history (past and present) as well as clinical blood parameter analyses are necessary to help evaluating possible contributing factors and the most probable cause of death in ARD.

Evaluation of Ketamine for Excited Delirium Syndrome in the Adult Emergency Department

BACKGROUND

Excited delirium syndrome (ExDS) is characterized by delirium, agitation, and hyperadrenergic autonomic dysfunction. A guideline for ExDS management, which recommends the use of ketamine as a second-line agent, was implemented in our hospital's adult emergency department (ED).

OBJECTIVE

The primary objective was to determine whether ketamine, 1 mg/kg intravenous (i.v.) or 2 mg/kg intramuscular (i.m.), is being used according to the ExDS guideline. Secondary objectives included evaluating the specific agents, routes, and dosages used to manage ExDS and the safety and efficacy of ketamine.

METHODS

Single-center, retrospective chart review of patients who received ketamine for the management of ExDS in the ED. Efficacy was measured by documented Richmond Agitation Sedation Scale (RASS) scores. Safety was assessed through evaluation of vital signs and adverse effects.

RESULTS

Thirty-one patients met inclusion criteria. Eight (25.8%) of them received ketamine for ExDS in adherence with all aspects of the guideline. Administration of ketamine led to a statistically significant decrease in median RASS score of 4 (interquartile range [IQR] 3 to 4) vs. 0 (IQR 2 to -1) (p = 0.001). There were no statistically significant differences in vital signs or RASS scores in our subgroup analyses of patients treated according to protocol and of those treated with ketamine, 2 mg/kg i.m.

CONCLUSIONS

We found discordance between current practice and our department's ExDS guideline for patients managed with ketamine. Despite the lack of adherence to departmental guidelines and allowing for limitations of this analysis due to small sample size, the use of low-dose, 1 mg/kg i.v. or 2 mg/kg i.m., ketamine was effective and appears to be a reasonable option as second-line therapy for ExDS.

Sex differences in α-pyrrolidinopentiophenone (α-PVP)-induced taste avoidance, place preference, hyperthermia and locomotor activity in rats

RATIONALE

The majority of synthetic cathinone research has used only male subjects, and as a result there are few studies assessing the impact of biological sex on their effects.

OBJECTIVES

The current work extends the characterization of the second-generation synthetic cathinone, α-PVP, by investigating how biological sex impacts α-PVP's aversive and rewarding effects important to its use and potential abuse.

METHODS

A combined conditioned taste avoidance/conditioned place preference preparation was utilized in which adult male and female Sprague Dawley rats were injected with 1.5, 3 or 6 mg/kg of racemic α-PVP or vehicle (saline) (IP). Following a 24-day washout period, rats were then tested for thermoregulatory effects of α-PVP using subcutaneous microchips to measure body temperature changes over the course of 8 h. This was followed 21 days later by assessments for α-PVP-induced locomotor activity and stereotypies over a 1-h session.

RESULTS

Dose-dependent conditioned taste avoidance was evident in both males and females, although females displayed weaker avoidance at 3 mg/kg compared to males. Males displayed a dose-dependent conditioned place preference, while females did not form a place preference at any dose. α-PVP elicited dose- and time-dependent hyperthermia, with males displaying a faster on-set and delayed off-set compared to females. α-PVP also produced dose- and time-dependent increases in locomotor activity (F > M) and stereotypies (M > F).

CONCLUSIONS

As described, males displayed greater rewarding (as indexed by place preference conditioning) and aversive (as indexed by taste avoidance, hyperthermia and stereotypies) effects of α-PVP. Although comparisons between males and females in α-PVP self-administration have not been reported, these data suggest that males may be more likely to use the drug. The implications for sex differences in human use of α-PVP were discussed.

EXCITATION study: Unexplained in-custody deaths: Evaluating biomarkers of stress and agitation

BACKGROUND

Law enforcement personnel often confront violent and dangerous individuals suffering from Excited Delirium Syndrome (ExDS) who need emergent medical evaluation and treatment to optimize the best outcomes for this potentially lethal medical emergency. These subjects typically require physical restraint and use of force measures to control them. We sought to determine if stress-related biomarkers can differentiate ExDS subjects when compared with agitation and stress under other circumstances, including agitation and extreme physical exhaustion and restraint coupled with emotional stressors.

METHODS

This was a prospective multi-center study enrolling a convenience sample of patients who presented with agitation or ExDS. Patients were enrolled from three academic emergency departments (ED), two in the United States and one in Canada. Three study groups (SG) included: SG1) patients brought to the ED with ExDS based on the use of standardized clinical criteria; SG2) ED patients with acute agitation who were not in a clinical state of ExDS but required sedation; SG3) a laboratory control group of subjects exercised to physical exhaustion, restrained, and psychologically stressed with threat of Conducted Energy Device (CED) activation. We examined a panel of stress-related biomarkers, including norepinephrine (NE), cortisol, copeptin, orexin A, and dynorphin (Dyn) from the blood of enrolled subjects.

RESULTS

A total of 82 subjects were enrolled: 31 in the agitation group, 21 in the ExDS group, and 30 in the laboratory control group. Data were analyzed, comparing the findings between ExDS and the two other groups to determine if specific stress-related biomarkers are associated with ExDS. Biomarker comparisons between subjects identified with ExDS, agitation, and control groups demonstrated that cortisol levels were more elevated in the ExDS group compared with the other groups. Orexin was only significant in ExDs (with Agitated tendency but lot of variability in the group). NE and Dyn increased as response to stress in Agitated and ExDS.

CONCLUSIONS

Cortisol levels were more elevated in subjects in the ExDS group compared with the other comparison groups and orexin was elevated in ExDS compared to controls, a trend that did not reach statistical significance in the agitated group. The clinical or diagnostic significance of these difference have yet to be defined and warrants further study.

Can acute stress be fatal? A systematic cross-disciplinary review

In this review it is discussed if acute stress can be fatal. The review is based on literature searches on PubMed, PsycINFO as well as Web of Science. Literature concerning the conditions excited delirium syndrome (ExDS), malignant catatonia, takotsubo cardiomyopathy (TCM), and capture myopathy (CM) is reviewed and compared. The aim of the article is to identify and discuss a possible fatalness as well as a common pathophysiology behind these conditions. This includes a deregulated autonomic nervous system, neurocardiac reasons for myocardial damage, and rhabdomyolysis. We conclude that these conditions could be different manifestations of the same pathophysiological phenomenon. In addition, we suggest that it is possible to die from acute stress, but that it requires a prior sensitization, as seen in cocaine abusers and certain psychiatric patients, to render individuals disposed to an extreme autonomic nerve reaction. Lay summary This article compares different conditions in humans and in other animals, where it appears as if the human or animal dies with no other reason than being submitted to an extreme condition of mental stress. The conditions examined via a literature search are excited delirium syndrome, malignant catatonia and takotsubo cardiomyopathy in humans, and a capture myopathy in different mammals. The article theoretically suggests that one can die solely from acute stress, but that different forms sensitization probably goes ahead of such a fatal stress reaction. E.g. in cocaine addicts, some psychiatric patients, and in wild animals formerly subjected to stress an extreme sympathetic stress response might be immediately fatal. The article also theorizes that excited delirium syndrome, malignant catatonia, and capture myopathy could be more severe and acute variants of the temporary condition seen in takotsubo patients, also known as patients with broken heart syndrome.

Hot Off the Press: SGEM #218. Excited Delirium: A Systematic Review

This systematic review provides an assessment of the excited delirium syndrome (ExDS), including definition, epidemiology, pathophysiology, and management. Sixty-six relevant articles were included with significant heterogeneity of selected studies and poor overall quality. A quantitative meta-analysis could not be performed because there remains no clear definition for ExDS, however, this study does provide useful information regarding epidemiology, pathophysiology, and treatment of ExDS.

Management of Violence and Aggression in Emergency Environment; a Narrative Review of 200 Related Articles

CONTEXT

The aim of this study is to reviewing various approaches for dealing with agitated patients in emergency department (ED) including of chemical and physical restraint methods.

EVIDENCE ACQUISITION

This review was conducted by searching "Violence," "Aggression," and "workplace violence" keywords in these databases: PubMed, Scopus, EmBase, ScienceDirect, Cochrane Database, and Google Scholar. In addition to using keywords for finding the papers, the related article capability was used to find more papers. From the found papers, published papers from 2005 to 2018 were chosen to enter the paper pool for further review.

RESULTS

Ultimately, 200 papers were used in this paper to conduct a comprehensive review regarding violence management in ED. The results were categorized as prevention, verbal methods, pharmacological interventions and physical restraint.

CONCLUSION

In this study various methods of chemical and physical restraint methods were reviewed so an emergency medicine physician be aware of various available choices in different clinical situations for agitated patients.

Rapid agitation control with ketamine in the emergency department (RACKED): a randomized controlled trial protocol

Background

The rapid control of patients presenting to the emergency department (ED) with psychomotor agitation and violent behavior is paramount for the safety of patients and ED staff. The use of intramuscular (IM) ketamine in the pre-hospital and ED settings has demonstrated promising preliminary results to provide rapid and safe behavioral control. A prospective, randomized controlled trial is required to measure the potential superiority of IM ketamine compared to current standard care (IM benzodiazepines plus antipsychotics).

Methods

This will be a parallel, prospective, randomized, controlled trial of 5 mg/kg IM ketamine compared to a combination of 5 mg IM midazolam and 5 mg IM haloperidol. The study will enroll approximately 184 patients, randomized equally to two study arms. There will be one study visit during which study medication will be administered and assessments will be completed. A follow-up safety visit will occur on day 3. The primary objective of this study is to compare IM ketamine to a combination of IM midazolam and haloperidol with regards to the time required for adequate behavioral control, in minutes, in patients presenting to the ED with psychomotor agitation and violent behavior, as measured by the Richmond Agitation-Sedation Scale (RASS).

Discussion

We present a novel study to determine whether ketamine is a rapid and safe option, compared to a combination of midazolam and haloperidol for the sedation of patients presenting to the ED with psychomotor agitation and violent behavior. To our knowledge, this study is the first randomized controlled trial to compare ketamine to current standard care for this indication. We have attempted to address numerous logistical issues with the design of this study including a waiver of consent, ensuring adequate blinding of outcome assessors, patient enrolment, and data monitoring.

Trial registration

Clinicaltrials.gov, NCT03375671. Registered on 18 December 2017.

Electronic supplementary material

The online version of this article (10.1186/s13063-018-2992-x) contains supplementary material, which is available to authorized users.

Excited delirium syndrome (ExDS): Situational factors and risks to officer safety in non-fatal use of force encounters

STUDY OBJECTIVE

Police use of force (UoF) encounters include individuals with Excited Delirium Syndrome (ExDS) with some frequency. Situational factors and risks to officer safety associated with these encounters have not been well studied. We examined the likelihood that subjects displaying various concomitant features of ExDS were under the influence of drugs and/or alcohol. We also examined the extent of subject violence, and the impact of this behaviour on the encounter (e.g., the odds of a struggle). Greater understanding of the prevalence of ExDS and the specific risk it represents to law enforcement officers and the subjects they encounter will guide appropriate policy and response strategies.

METHODS

A prospective evaluation of a consecutive cohort of subjects involved in UoF encounters with police was conducted. Data were collected from January 2012 to December 2015. Consistent with previous research, the presence of six or more features was used to identify probable cases of ExDS. The odds that subjects in a state of probable ExDS were under the influence of drugs and/or alcohol was calculated and compared against subjects who exhibited less than three features of ExDS. In addition, the violent nature of subjects (e.g., the odds of a subject being in possession of a weapon) displaying various concomitant features of the syndrome was examined. The number of sudden and unexpected arrest-related death (ARDs) was documented.

RESULTS

UoF occurred in 9006 of 10.9 million police-public interactions (0.08%). Of the UoF encounters, 156 (1.7%) subjects displayed six or more features of ExDS. With four recorded sudden and unexpected ARDs of violent and agitated subjects in our cohort, up to 6.3% of these subjects experiencing probable ExDS could be expected to be at risk of sudden death. Logistic regression analyses indicated that there were significantly higher odds that subjects exhibiting more features of ExDS (e.g., six or more) were under the influence of drugs. On the other hand, there were significantly lower odds that individuals exhibiting ExDS were under the influence of alcohol alone. In addition, those displaying a greater number of features demonstrated higher odds of engaging in assaultive behaviour, presenting a threat of grievous bodily harm or death, and being involved in a struggle that went to the ground with an officer. A slight increase in the presence of weapons was observed in encounters with probable ExDS.

CONCLUSION

Our study provides important information to guide the development of policy and procedure in law enforcement. Police encounter a subject with ExDS 1 in every 58 UoF incidents (1.7%). Those individuals are at higher odds of being intoxicated with drugs according to officers' assessments and at risk of being further exerted during a struggle on the ground, both of which appear to play a major role in deaths associated to ExDS. There is a demonstrable increase in risk to officers and public safety from the violent behaviour displayed by subjects presenting a greater number of features of ExDS. Our data suggests that up to 6.3% of subjects in a state of ExDS could succumb to ARDs; however, we cannot comment on the prevalence of death for persons with ExDS who do not encounter police. Further research is needed to determine which force options optimize outcome for police and subjects. Additionally, research surrounding pathophysiology leading to death should focus on subjects with six or more features of ExDS. Ultimately, a better understanding in this area will contribute to improving the outcomes of these encounters for those suffering from ExDS and those tasked with assisting them.

Outcomes of Prehospital Chemical Sedation With Ketamine Versus Haloperidol and Benzodiazepine or Physical Restraint Only

OBJECTIVE

The goal of this study is to describe complications and outcomes of prehospital ketamine use for agitation as compared to other methods of physical or chemical restraint such as haloperidol plus benzodiazepine or physical restraint only.

METHODS

We conducted a single-center retrospective review of patient encounters in which restraint was administered in the prehospital setting. At the beginning of our study window, only physical restraint was available to paramedics managing agitated patients but subsequently, haloperidol and benzodiazepines were introduced, followed by ketamine 2 years later. By comparing patients before and after each transition, we divided subjects into 3 cohorts based on restraint type: physical restraint, haloperidol plus benzodiazepine, and ketamine. Demographic data were collected, and outcome measures included intubation rate, need for additional physical or chemical restraint, emergency department (ED) length of stay, need for hospital admission, and employee injury.

RESULTS

Of 214 subjects included in the study, 95 patients were administered ketamine, 68 received haloperidol and benzodiazepine, and 51 were physically restrained. Eleven of the patients (11.6%) who received ketamine were intubated. Compared to patients who received haloperidol plus benzodiazepine, patients who received ketamine were more likely to be intubated (odds ratio [OR] = 8.77, 95% confidence interval [CI], 1.10-69.68) and were more likely to require additional chemical restraint when compared to haloperidol/benzodiazepine or physical restraint only (OR =2.94, 95% CI, 1.49-5.80, and OR =2.15, 95% CI, 1.07-4.31, respectively). There were no differences between the 2 chemical sedation groups in terms of ED length of stay or hospital admission rate.

CONCLUSIONS

This study demonstrates a lower intubation rate in patients administered ketamine than prior literature in association with a lower weight-based dosing regimen. Ketamine use was correlated with a higher frequency of intubation and a greater need for additional chemical restraint when compared with other restraint modalities, though exogenous factors such as provider preference may have impacted this result. There was no difference in ED length of stay or admission rate between the ketamine and haloperidol plus benzodiazepine groups. Further prospective study is needed to determine whether there is a subset of patients for whom ketamine would be beneficial compared to other therapies.

Electrical weapons and excited delirium: shocks, stress, and serum serotonin

It has been suggested that a CEW (conducted electrical weapon) exposure could elicit a stress response that could cause ExDS (excited delirium syndrome). There are some parallels between the signs of ExDS and serotonin syndrome (SS). Electroconvulsive therapy raises serotonin levels and therefore provides a plausible link between CEW applications and elevated serotonin levels. This study was designed to determine whether a CEW exposure elevates serum serotonin. A total of 31 police academy cadets were exposed to a very broad-spread 5-s CEW stimulus from a TASER brand X26 CEW. Blood was drawn before and after the exposure and at 24 h post exposure to measure serum serotonin levels. Lactic acid and cortisol levels were also compared. Median serum serotonin levels were 30 IQR (21,46), 36 IQR (22,50), and 32 IQR (21,45) ng/mL before exposure, after exposure, and 24 h after exposure (NS by pooled comparisons). The increase from baseline to post-test serotonin (∆ median = +6, ∆ mean = +2.7) ng/mL was not significant by a paired T-test (p = .29) but was significant by the Wilcoxon signed-rank test (p = .037). The increase to post-test log serotonin was not significant by a paired T-test (p = .13) but was significant by the Wilcoxon test (p = .049). All serotonin levels remained within the normal reference range of 0-200 ng/mL. Post-hoc analysis demonstrated that the study was powered to detect a ½ SD change, in log serotonin, with a 90% likelihood. With a very-broad electrode spread, CEW exposure did not significantly raise serum serotonin levels.

Excited Delirium: A Systematic Review

OBJECTIVE

We aimed to clarify the definition, epidemiology, and pathophysiology of excited delirium syndrome (ExDS) and to summarize evidence-based treatment recommendations.

METHODS

We conducted a systematic literature search of MEDLINE, Ovid, Web of Knowledge, and Cochrane Library for articles published to March 18, 2017. We also searched the gray literature (Google Scholar) and official police or medical expert reports to complete specific epidemiologic data. Search results and full-text articles were independently assessed by two investigators and agreements between reviewers assessed with K statistics. We classified articles by study type, setting, and evidence level.

RESULTS

After reviewing the title and abstract of 3,604 references, we fully reviewed 284 potentially relevant references, from which 66 were selected for final review. Six contributed to the definition of ExDS, 24 to its epidemiology, 38 to its pathophysiology, and 27 to its management. The incidence of ExDS varies widely with medical or medicolegal context. Mortality is estimated to be as much as 8.3% to 16.5%. Patients are predominantly male. Male sex, young age, African-American race, and being overweight are independent risk factors. Pathophysiology hypotheses mostly implicate dopaminergic pathways. Most cases occur with psychostimulant use or among psychiatric patients or both. Proposed treatments are symptomatic, often with rapid sedation with benzodiazepines or antipsychotic agents. Ketamine is suggested as an alternative.

CONCLUSION

The overall quality of studies was poor. A universally recognized definition is lacking, remaining mostly syndromic and based on clinical subjective criteria. High mortality rate may be due to definition inconsistency and reporting bias. Our results suggest that ExDS is a real clinical entity that still kills people and that has probably specific mechanisms and risk factors. No comparative study has been performed to conclude whether one treatment approach is preferable to another in the case of ExDS.

Is LSD toxic?

LSD (lysergic acid diethylamide) was discovered almost 75 years ago, and has been the object of episodic controversy since then. While initially explored as an adjunctive psychiatric treatment, its recreational use by the general public has persisted and on occasion has been associated with adverse outcomes, particularly when the drug is taken under suboptimal conditions. LSD's potential to cause psychological disturbance (bad trips) has been long understood, and has rarely been associated with accidental deaths and suicide. From a physiological perspective, however, LSD is known to be non-toxic and medically safe when taken at standard dosages (50-200μg). The scientific literature, along with recent media reports, have unfortunately implicated "LSD toxicity" in five cases of sudden death. On close examination, however, two of these fatalities were associated with ingestion of massive overdoses, two were evidently in individuals with psychological agitation after taking standard doses of LSD who were then placed in maximal physical restraint positions (hogtied) by police, following which they suffered fatal cardiovascular collapse, and one case of extreme hyperthermia leading to death that was likely caused by a drug substituted for LSD with strong effects on central nervous system temperature regulation (e.g. 25i-NBOMe). Given the renewed interest in the therapeutic potential of LSD and other psychedelic drugs, it is important that an accurate understanding be established of the true causes of such fatalities that had been erroneously attributed to LSD toxicity, including massive overdoses, excessive physical restraints, and psychoactive drugs other than LSD.

Ketamine Sedation for Patients With Acute Behavioral Disturbance During Aeromedical Retrieval: A Retrospective Chart Review

OBJECTIVE

The aim of this study was to determine the prevalence, safety (as measured by the incidence of adverse events), and effectiveness (as measured by the incidence of intubations) of ketamine sedation in patients with acute behavioral disturbance (ABD) during air medical retrieval.

METHODS

This was a retrospective observational study. Eligible patients were identified by searching the electronic databases of 2 air medical retrieval services in Queensland, Australia, for adult patients with ABD transported between January 1, 2015, and June 30, 2016. Data abstraction was performed as per standard chart review criteria. The incidences of intubations and adverse reactions were the main outcomes.

RESULTS

One hundred twenty-two patients met the inclusion criteria. Thirty-one (25.4%) patients were intubated, 21 (17.2%) for airway protection/respiratory depression and 10 (8.1%) for persistent ABD. Twenty-one (17.2%) patients received ketamine, 3 of whom (14.3%) were intubated for persistent ABD. Nine (42.9%) patients developed hypertension after ketamine, 2 of whom needed intervention. One patient developed hypoxia after ketamine that resolved without intervention, and 1 patient developed increased secretions. No patients developed nausea, vomiting, emergence phenomena, apnea, or laryngospasm.

CONCLUSION

Our study suggests that ketamine is a safe and effective agent for sedating patients with ABD during air medical retrieval.

A Novel Agent for Management of Agitated Delirium: A Case Series of Ketamine Utilization in the Pediatric Emergency Department

Control of the agitated patient in the emergency department is challenging. Many options exist for chemical sedation, but most have suboptimal pharmacodynamic action, and many have undesirable adverse effects. There are reports of ketamine administration for control of agitation prehospital and in traumatically injured patients. Ketamine is a noncompetitive N-methyl-D-aspartic acid receptor antagonist, making it an effective dissociative agent. We present 5 cases of ketamine administration to manage agitated adolescent patients with underlying psychiatric disease and/or drug intoxication. Ketamine, as a dissociative agent, may be an alternative pharmacological consideration for the control of agitation in patients with undifferentiated agitated delirium.

Mass-Gathering Medical Care in Electronic Dance Music Festivals

Introduction

Electronic dance music (EDM) festivals represent a unique subset of mass-gathering events with limited guidance through literature or legislation to guide mass-gathering medical care at these events.

Hypothesis/Problem

Electronic dance music festivals pose unique challenges with increased patient encounters and heightened patient acuity under-estimated by current validated casualty predication models.

Methods

This was a retrospective review of three separate EDM festivals with analysis of patient encounters and patient transport rates. Data obtained were inserted into the predictive Arbon and Hartman models to determine estimated patient presentation rate and patient transport rates.

Results

The Arbon model under-predicted the number of patient encounters and the number of patient transports for all three festivals, while the Hartman model under-predicted the number of patient encounters at one festival and over-predicted the number of encounters at the other two festivals. The Hartman model over-predicted patient transport rates for two of the three festivals.

Conclusion

Electronic dance music festivals often involve distinct challenges and current predictive models are inaccurate for planning these events. The formation of a cohesive incident action plan will assist in addressing these challenges and lead to the collection of more uniform data metrics.

FitzGibbonKM, NableJV, AydB, LawnerBJ, ComerAC, LichensteinR, LevyMJ, SeamanKG, BusseyI. Mass-gathering medical care in electronic dance music festivals. Prehosp Disaster Med. 2017;32(5):563–567.

Comprehensive Histological and Immunochemical Forensic Studies in Deaths Occurring in Custody

In-custody deaths have several causes, and these include homicide, suicide, natural death from chronic diseases, and unexplained death possibly related to acute stress, asphyxia, excited delirium, and drug intoxication. In some instances, these deaths are attributed to undefined accidents and natural causes even though there is no obvious natural cause apparent after investigation. Understanding these deaths requires a comprehensive investigation, including documentation of circumstances surrounding the death, review of past medical history, drug and toxicology screens, and a forensic autopsy. These autopsies may not always clearly explain the death and reveal only nonspecific terminal events, such as pulmonary edema or cerebral edema. There are useful histologic and biochemical signatures which identify asphyxia, stress cardiomyopathy, and excited delirium. Identifying these causes of death requires semiquantitative morphologic and biochemical studies. We have reviewed recent Bureau of Justice Statistics on in-custody death, case series, and morphological and biochemical studies relevant to asphyxia, stress cardiomyopathy, and excited delirium and have summarized this information. We suggest that regional centers should manage the investigation of these deaths to provide more comprehensive studies and to enhance the expertise of forensic pathologists who would routinely manage potentially complex and difficult cases.