Research Progress on Forensic Toxicology of Z-drugs / 法医学杂志

The Z-drugs (zolpidem, zopiclone, and zaleplon), as the innovative hypnotics, have an improvement over the traditional benzodiazepines in the management of insomnia. Z-drugs have significant hypnotic effects by reducing sleep latency and improving sleep quality, though duration of sleep may not be significantly increased. As benzodiazepines, Z-drugs exert their effects through increasing the transmission of γ-aminobutyric acid. Z-drugs overdose are less likely to be fatal, more likely would result in poisoning. Z-drugs can be detected in blood, urine, saliva, and other postmortem specimens through liquid chromatography-mass spectrometry techniques. Zolpidem and zaleplon exhibit significant postmortem redistribution. Z-drugs have improved pharmacokinetic profiles, but incidence of neuropsychiatric sequelae, poisoning, and death may prove to be similar to the other hypnotics. This review focuses on the pharmacology and toxicology of Z-drugs with respect to their adverse effect profile and toxicity and toxicology data in the field of forensic medicine.

Intento de suicidio vía ingesta de fármacos en niños / Suicide attempts secondary to self-inflicted drug poisoning

Suicide attempts in children are an important worldwide cause of morbidity and mortality and an emerging reason for admission in Pediatric Critical Care. Objective: Identify the epidemiologic and clinical characteristics of patients with drug poisoning with a suicide purpose as an admission cause in a Chilean Pediatric Intensive Care Unit (PICU). Design: Retrospective observational study. Setting: 14 beds PICU of a tertiary care public teaching hospital in Santiago de Chile. Material and Method: All patients admitted to the PICU between January 2005 and December 2008 for self-inflicted drug poisoning with an expressed intention of suicide were included. Analysis of the PICU clinical chart was performed with sampling on an excel data base. For seasonal distribution we used statistical analysis Xil. Results: 178 of 3045 PICU admissions were diagnosed as drug poisoning (5,8 percent), 108 of them for suicide attempts (60,6 percent).The number of annual patients increased, with highest incidence in spring and autumn and lowest in winter. Mean and median age was 13 years, 8,4 percent less than 12 years. 88,9 percent were females. They used polipharmacy in 57 percent. Drugs were taken from home. Antidepressants and sedatives were the most often used. An underlying psychiatric condition was present in 100 cases (92,6 percent). Associated factors were family disfunction, school problems, abuse and violation and bullying. Mean PICU stay was 1,46 days with 16,7 percent requiring transient mechanical ventilation No death was reported in this serie. Conclusions: The number of cases of suicide attempt via drug ingestion as a motive for admission in PICU is increasing, causing a raising number of short and transient admissions, more in spring less in winter. Risk factors were mostly an underlying psychiatric disorder and family disfunction.

Introducción: El intento de suicidio en pediatría, via ingestión de fármacos, es una importante causa de mor-bimortalidad en el mundo y un creciente motivo de ingreso a cuidados intensivos. Objetivo: Identificar las características clínicas y epidemiológicas de los pacientes con intoxicación por fármacos con un intento de suicidio, como causa de ingreso a una Unidad de Cuidados Intensivos Pediátricos en Chile (UC1P). Diseño: Estudio retrospectivo observacional. Pacientes y Método: UClP de 14 camas críticas en un hospital pediátrico de Santiago. Se incluyeron todos los pacientes ingresados a la UClP debido a intento de suicidio por ingestión de fármacos, entre enero 2005 a diciembre 2008. Resultados: 178 de 3 045 egresos se debieron a intoxicación por fármacos (5,8 por ciento) ,108 de ellos por intento de suicidio (60,6 por ciento). La tendencia observada es a un incremento anual, con mayor incidencia en primavera y otoño, y menor en invierno. La media y mediana de edad fue de 13 años, 8,4 por ciento menor de 12 años. 88,9 por ciento fueron mujeres, Se utilizó polifarmacia en un 57 por ciento con fármacos disponibles en el hogar. Antidepresivos y sedantes fueron los más usados. Patología psiquiátrica de base se diagnosticó en un 92,6 por ciento de los casos. Factores asociados fueron disfunción familiar, problemas en el colegio, abuso y violación, bullying. La estadía promedio en UClP fue de 1,5 días, requiriendo un 16,7 por ciento ventilación mecánica transitoria. No hubo fallecidos en esta serie. Conclusiones: El intento de suicidio por ingestión de fármacos como motivo de ingreso a UClP ha aumentado, requiriendo estadías cortas y transitorias, mayormente en primavera y menos en invierno. Factores asociados fueron patología psiquiátrica de base y disfunción familiar.

Comparative analysis of 607 autopsy cases of poisoning death / 法医学杂志

OBJECTIVE@#To provide references for forensic expertise by investigating the kinds of toxicant, routes of exposure and manners of poisoning deaths, etc.@*METHODS@#Six hundred and seven autopsy cases of poisoning deaths from 1957 to 2008 in Department of Forensic Medicine, Tongji Medical College (Tongji Forensic Science Identification Center of Hubei), were comparatively reviewed.@*RESULTS@#In 218 cases from 1999 to 2008, more than 50% of decedents were male in the ages of 30-49. The toxicants are usually taken orally and the most common manner of death was accidental. The common substances involved in poisoning death were rodenticide, poisoning gas and insecticide. Compared to the data of 1983-1998 and 1957-1982, the common toxic agents had changed significantly. The number of cases involving insecticide and cyanide poisoning decreased in recent years, and the number of cases of rodenticide, poisoning gas, alcohols poisoning displayed an increase tendency, especially for drugs abuse.@*CONCLUSION@#Poisoning deaths of pesticides remain a major public health problem for a long time and the awareness of prevention need to be raised, especially for the prevention of deaths from multiple poisons.

Stability of estazolam in dog tissues preserved in formaldehyde solution / 法医学杂志

OBJECTIVE@#To investigate the stability of estazolam in biological samples preserved in formaldehyde solution.@*METHODS@#The dog was given intragastric administration of estazolam with a dose of 37.6 mg/kg and killed 2 h later. Heart, liver, kidney and brain of the dog were cut up into 1 g and preserved in 4% formaldehyde solution respectively. The content of estazolam in biological samples and formaldehyde solution were analyzed by HPLC at different times.@*RESULTS@#The content of estazolam in heart, liver, kidney and brain or in formaldehyde solution reduced gradually followed with the extention of preservation time. At the 63rd day, estazolam content in four tissues were 0.8%, 1.7%, 1.0% and 2.2% of the original content respectively.@*CONCLUSION@#Estazolam in tissues can diffuse into formaldehyde solution and decomposed quickly, so biological samples contained estazolam should not be preserved in formaldehyde solution.