Prospective study of the safety and effectiveness of droperidol in elderly patients for pre-hospital acute behavioural disturbance

Objective: Acute behavioural disturbance in the elderly (≥65 years) is a significant issue for emergency medical services with increasing prevalence of dementia and aging populations. We investigated the pre-hospital safety and effectiveness of droperidol in the elderly with acute behavioural disturbance. Methods: This was a pre-hospital prospective observational 1-year study of elderly patients with acute behavioural disturbance. The primary outcome was proportion of adverse events (AEs) (airway intervention, oxygen saturatio

Rising prescription stimulant poisoning in Australia: a retrospective case series

AbstractWith rising therapeutic use worldwide, prescription stimulants are increasingly implicated in poisonings. Most of the limited research on stimulant poisoning focuses on illicit amphetamines. We aimed to investigate the clinical effects of intentional prescription stimulant poisoning. This is a retrospective review of hospitalised patients referred to a Poisons Information Centre and a toxicology unit following intentional exposures to prescription stimulants (dexamfetamine, lisdexamfetamine and methylphenidate) from 1 January 2018 through 31 December 2021. Patients were identified from both units’ databases and data extracted from medical records. To facilitate comparison a dexamfetamine-equivalent dose was calculated. There were 186 intentional exposures in 178 patients (median age 17 years, males 54%) over the study period, consisting of 44 (24%) dexamfetamine, 50 (27%) lisdexamfetamine and 92 (49%) methylphenidate exposures. Stimulant exposures rose annually from 34 presentations in 2018 to 61 in 2021. Deliberate self-poisoning accounted for 139 (75%) presentations and the remaining 47 (25%) were recreational. Co-ingestions were taken in 101 (54%) presentations, leaving 85 (46%) single-agent exposures with a median dexamfetamine-equivalent dose ingested of 135 mg (range 15-4500 mg). Of the single-agent exposures tachycardia (69%), hypertension (47%) and agitation (58%) were the commonest clinical features. Most patients (58%) had mild-moderate symptoms, managed solely with supportive cares or oral sedation. Twenty-three (27%) patients had severe agitation receiving parenteral sedation. Rhabdomyolysis occurred in 3 single-agent exposures (4%) and 8 (9%) had an acute kidney injury. Severe cardiovascular toxicity was rare, with one patient developing hypertensive crisis and another having a supraventricular tachycardia. The median length of stay for single-agent exposures was 11 h (IQR 5-19 h). Prescription stimulant poisoning appears to be rising and commonly results in tachycardia, hypertension, and agitation. Severe cardiovascular toxicity was rare

A fatal case of polyoxyethylated-<i>p</i>-nonylphenol surfactant (Wetter 600) ingestion

A fatal case of polyoxyethylated-p-nonylphenol surfactant (Wetter 600) ingestio

Epidemiology of out-of-hospital cardiac arrests that occur secondary to chemical asphyxiants: A retrospective series

Aim: To determine the epidemiological characteristics, temporal trends and survival outcomes of OHCAs precipitated by chemical asphyxiation. Methods: We conducted a retrospective cohort analysis of OHCAs attended by paramedics in Queensland, Australia between 2011 and 2020. Patients were classified into two groups depending on the asphyxiating agent involved; simple (argon, carbon dioxide, helium, liquified petroleum gas, nitrogen) and systemic (carbon monoxide, cyanides, hydrogen sulfide, methemoglobin-inducing substances, smoke inhalation). Incidence rates, characteristics and outcomes were described for the entire cohort and independently for each group, with the groups then compared. Temporal trends of asphyxiant utilisation were also described. Results: During the study period, 50,669 OHCAs were attended, with 551 (1.1%) attributable to chemical asphyxiation. The incidence rate was 1.1 per 100,000 population with no significant temporal changes. Suspected suicide was the primary cause of exposure (-95.8%), with systemic asphyixants the dominant agent reported in comparison to simple agents (66.4% vs 33.6%). Over the 10-year period, events precipitated by carbon monoxide decreased by 26.2% (p for trend < 0.001), helium remained unchanged (p for trend = 0.302) and incidents involving nitrogen increased by 28.7% (p for trend < 0.001). Overall, 14.2% (78/551) of the study cohort received a resuscitation attempt by paramedics with 6.4% of these incidents witnessed and 2.6% involving patients presenting in a shockable rhythm. Survival rates were low, with 6.4% surviving the index event, and 1.3% surviving to hospital discharge with a normal neurocognitive function. Conclusion: OHCA precipitated by chemical asphyxiation is relatively infrequent and associated with poor survival outcomes.</p

Neurotoxicity in chronic lithium poisoning

Background: Lithium-induced neurotoxicity typically occurs with chronic accumulation rather than following acute overdose. There is little emphasis in the literature on the protracted nature of lithium neurotoxicity long after the lithium concentration returns to the therapeutic range. Aims: To characterise lithium neurotoxicity, with a view of increasing awareness of this important phenomenon. METHODS: This is a retrospective observational study of patients presenting with lithium-induced neurotoxicity over a 5-year period to a clinical toxicology unit. Patients were identified through the unit's database, and clinical notes were analysed. Results: There were 22 patients, with a median age of 65 (range: 36-89) years. Six patients (27%) had previous lithium toxicity, and nine (41%) were regularly prescribed medications that impair lithium excretion. The median lithium concentration on presentation was 2.2 mmol/L, taking a median of 3 days to return to the therapeutic range. Reversible acute kidney injury was observed in 21 patients (95%) on presentation. The median length of stay was 13 (range: 3-95) days due mostly to delayed neurological recovery. Confusion was the predominant symptom, present in 21 (95%) patients, followed by tremors (18(82%)) and ataxia (16(73%)). Multiple investigations were performed to exclude delirium differentials, including 11 computed tomography (CT) and five magnetic resonance imaging (MRI) brain scans, all unremarkable. Conclusions: Lithium neurotoxicity has a prolonged course. Its severity correlates poorly with lithium concentrations, which normalise quickly. Most poisonings occur in elderly patients with acute kidney injury. Prolonged delirium often prompts multiple unnecessary investigations. Rationalisation of lithium therapy is important in elderly patients

Establishing a dedicated toxicology unit reduces length of stay of poisoned patients and saves hospital bed days

Objective: This study evaluates the effect on the average length of stay (LOS), relative stay index (RSI), bed days and costs saved following the establishment of a dedicated clinical toxicology unit in an Australian tertiary referral hospital. Methods: This retrospective descriptive study uses Health Roundtable and other state and federal data to compare the average LOS, RSI, estimated bed days and costs saved by patients admitted with a diagnosis-related group (DRG) of X62 (Poisoning/Toxic Effects of Drugs and Other Substances), over the 4 year period 2012–2015. This period corresponds to before and after the introduction of the clinical toxicology unit in February 2014 at the Princess Alexandra Hospital, a tertiary referral teaching hospital in Brisbane, Queensland, Australia. Results: There was a reduction in the average LOS and RSI from 2.1 days and 122% in 2012 to 0.9 days and 52% in 2015, respectively. This reduction correlates with a reduction in 1350 bed days and a saving of $2.25 million over the 2 year period 2014–2015 since the clinical toxicology unit was established. Conclusion: The reduction in average LOS is similar to results previously published by two Australian toxicology units over 15 years ago. Despite changes in healthcare delivery since this time, these results continue to support the efficiency and associated cost saving of a dedicated toxicology unit in managing poisoned patients

Methamphetamine intoxication and acute kidney injury: a prospective observational case series

Background and objectives The effects of methamphetamine intoxication on the kidney are not well reported. We aimed to investigate acute kidney injury (AKI) associated with methamphetamine intoxication, in particular its severity, duration and association with rhabdomyolysis. Design setting, participants, and measurements This is a prospective observational series of methamphetamine intoxicated patients presenting to an Emergency Department. Patients self‐reporting recent methamphetamine use, with a positive urine drug screen and an elevated creatinine, were eligible for the study. Urinary neutrophil gelatinase‐associated lipocalin (NGAL) was measured, and serum creatinine, creatine kinase and cystatin C concentrations were performed on arrival and at several time points until discharge from hospital. Demographic and clinical data were obtained from the medical records. Results There were 634 presentations with methamphetamine intoxication over a 10‐month period, with 73/595(12%) cases having an elevated serum creatinine concentration on arrival. 50 presentations in 48 patients were included in the study. Most patients (85%) were male with a median age of 32 years. The median serum creatinine concentration on presentation was 125 μmol/L (IQR:113‐135μmol/L) with 45(90%) presentations meeting diagnostic criteria for AKI. Concurrent rhabdomyolysis occurred in 22(44%) presentations with a median CK of 2695 U/L (IQR:1598–5060 U/L). Cystatin C was elevated (> 0.98 mg/L) in 18 cases. An elevated NGAL concentration (>150μg/L) was present in five (10%) cases. No patients required dialysis. The median length of stay was 19 hours (IQR 14‐24hours). Conclusions AKI is common in methamphetamine intoxication. The kidney injury is relatively mild and short‐lived, resolving with crystalloid therapy

Duloxetine overdose causes sympathomimetic and serotonin toxicity without major complications

Objective: Duloxetine is a commonly used antidepressant that is a serotonin and norepinephrine reuptake inhibitor. We aimed to investigate the frequency and severity of clinical effects following duloxetine overdose. Methods: We undertook a retrospective review of duloxetine overdoses (>120 mg) admitted to two tertiary toxicology units between March 2007 and May 2021. Demographic information, details of ingestion (dose, co-ingestants), clinical effects, investigations (ECG parameters including QT interval), complications (coma [GCS < 9], serotonin toxicity, seizures and cardiovascular effects), length of stay [LOS] and intensive care unit [ICU] admission were extracted from a clinical database. Results: There were 241 duloxetine overdoses (>120 mg), median age 37 years (interquartile range [IQR]: 25–48 years) and there were 156 females (65%). The median dose was 735 mg (IQR: 405–1200 mg). In 177 patients, other medications were co-ingested, most commonly alcohol, paracetamol, quetiapine, diazepam, ibuprofen, pregabalin and oxycodone. These patients were more likely to be admitted to ICU (12 [7%] vs. none; p = 0.040), develop coma (16 [9%] vs. none; p = 0.008) and hypotension [systolic BP 140 mmHg) in 29 (45%). One patient had persistent sympathomimetic toxicity, and one had hypotension after droperidol. Two patients of 63 with an ECG recorded had an abnormal QT: one QT 500 ms, HR 46 bpm, which resolved over 3.5 h and a second with tachycardia (QT 360 ms, HR 119 bpm). None of the 64 patients had an arrhythmia. Conclusion: Duloxetine overdose most commonly caused sympathomimetic effects and serotonin toxicity, consistent with its pharmacology, and did not result in coma, arrhythmias or intensive care admission, when taken alone in overdose

Epidemiology and survival outcomes of out-of-hospital cardiac arrest following volatile substance use in Queensland, Australia

Introduction: The deliberate inhalation of volatile substances for their psychotropic properties is a recognised public health issue that can precipitate sudden death. This study aimed to describe the epidemiological characteristics and survival outcomes of patients with out-of-hospital cardiac arrests following volatile substance use.Methods: We conducted a retrospective cohort analysis of all out-of-hospital cardiac arrest attended by the Queensland Ambulance Service over a ten-year period (2012-2021). Incidents were extracted from the Queensland Ambulance Service cardiac arrest registry, which collects clinical information using the Utstein-style guidelines and linked hospital data.Results: During the study period, 52,102 out-of-hospital cardiac arrests were attended, with 22 (0.04%) occurring following volatile substance use. The incidence rate was 0.04 per 100,000 population, with no temporal trends identified. The most commonly used product was deodorant cans (19/22), followed by butane canisters (2/22), and nitrous oxide canisters (1/22). The median age of patients was 15 years (interquartile range 13–23), with 14/22 male and 8/22 Indigenous Australians. Overall, 16/22 patients received a resuscitation attempt by paramedics. Of these, 12/16 were bystander witnessed, 10/16 presented in an initial shockable rhythm, and 9/16 received bystander chest compressions. The rates of event survival, survival to hospital discharge, and survival with good neurological outcome (Cerebral Performance Category 1–2) were 69% (11/16, 95% CI 41–89%), 38% (6/16, 95% CI 15–65%) and 31% (5/16, 11–59%), respectively. Eight patients in the paramedic-treated cohort that used hydrocarbon-based products were administered epinephrine during resuscitation. Of these, none subsequently survived to hospital discharge. In contrast, all six patients that did not receive epinephrine survived to hospital discharge, with 5/6 having a good neurological outcome.Conclusion: Out-of-hospital cardiac arrest following volatile substance use is rare and associated with relatively favourable survival rates. Patients were predominately aged in their adolescence with Indigenous Australians disproportionately represented