Asphyxial Deaths

Assessing the knot in a noose position by thyrohyoid and cervical spine fracture patterns in suicidal hangings using machine learning algorithms: A new insight into old dilemmas

Hanging is one of the most common suicide methods worldwide. Neck injuries that occur upon such neck compression - fractures of the thyrohyoid complex and cervical spine, occupy forensic pathologists for a long time. However, research failed to identify particular patterns of these injuries corresponding to the force distribution a ligature applies to the neck: the issue of reconstructing the knot in a noose position persists. So far, machine learning (ML) models were not utilized to classify knot positions and reconstruct this event. We conducted a single-institutional, retrospective study on 1235 autopsy cases of suicidal hanging, developed several ML models, and assessed their classification performance in a stepwise manner to discriminate between: 1. typical ('posterior) and atypical ('anterior' and 'lateral') hangings, 2. anterior and lateral hangings, and 3. left and right lateral hangings. The variable coding was based on the presence/absence of fractures of greater hyoid bone horns (GHH), superior thyroid cartilage horns (STH), and cervical spine. Subject age was considered. The models' parameters were optimized by the Genetic Algorithm. The accuracy of ML models in the first step was very modest (c. 60%) but increased subsequently: Multilayer Perceptron - Artificial Neural Network and k-Nearest Neighbors performed excellently discriminating between left and right lateral hangings (accuracy 91.8% and 90.6%, respectively). The latter is of great importance for clarifying probable hanging fracture biomechanics. Alongside the conventional inferential statistical analysis we performed, our results further indicate the association of the knot position with ipsilateral GHH and contralateral STH fractures in lateral hangings. Moreover, odds for unilateral GHH fracture, simultaneous GHH and STH fractures, and cervical spine fracture were significantly higher in atypical ('anterior' and 'lateral') hangings, compared to typical ('posterior') hangings.

The down-regulation of STC2 mRNA may serve as a biomarker for death from mechanical asphyxia

Death from mechanical asphyxia (DMA) is a common cause of death in forensic pathology. However, due to the lack of biomarkers, the authentication of DMA now relies on a series of non-specific signs, which may cause troubles in the judicial trials, especially when the criminal scene is not fully elucidated. To search for the potential biomarkers for DMA, brain samples of DMA and craniocerebral injury groups were screened by microarray. The obtained mRNAs were validated by animal and human samples. Primary cell culture was conducted to explore the biochemical changes under hypoxia. 415 differentially expressed mRNAs between two groups were discovered. Ten mRNAs were examined in both human and animal samples died of different causes of death. Stanniocalcin-2 (STC2) showed significant down-regulation in DMA samples compared to other groups, regardless of PMI, age, or temperature. Cellular experiments indicated that ROS level peaked after 15-min-hypoxic culture, when the expression level of STC2 was significant down-regulated simultaneously. The ER-stress-related proteins also showed potential connection with STC2. In general, it is indicated that the down-regulation of STC2 may serve as a biomarker for DMA.

The burden, risk factors and prevention strategies for drowning in Türkiye: a systematic literature review

INTRODUCTION

Drowning is a public health problem in Türkiye, as in the rest of the world. This study aims to systematically review the literature on drowning in Türkiye with a focus on data sources, epidemiology, risk factors and prevention strategies.

METHODS

Literature searches were conducted using PubMed, SPORTSDiscus, Scopus, Web of Science, Turk MEDLINE, Google Scholar and Google Akademik (Turkish language). Studies (limited to original research written in English and Turkish) reporting drowning (unintentional and intentional; fatal and non-fatal) of residents and tourists in Türkiye were independently dual screened at the title and abstract and full text stages. Study quality was assessed using JBI checklists and evidence level assessed based on study design.

RESULTS

From a total of 917 studies, 49 met the inclusion criteria. Most (51%) focused on unintentional fatal drowning. Included studies were most commonly analytical cross-sectional studies (n = 23) and case series (n = 20) meaning the evidence level was low or very low for 48 (98%) studies. Fifteen studies examined drowning at the national level, while sub-national studies (n = 30) focused on urban areas across three provinces: Antalya (n = 6), Istanbul (n = 6), Izmir (n = 4). There was little consensus on risk factors beyond male drowning risk, and no data reported on implemented or evaluated drowning prevention interventions.

DISCUSSION

There is a need for more national-level studies to identify the causes of drowning and to guide intervention implementation and evaluation to inform policy makers and donors. Currently official data is limited in its detail, providing age and gender data only, hampering efforts to identify, and thus address, causal factors for drowning.

PRACTICAL APPLICATIONS

There is currently very little evidence to inform investment in effective drowning prevention interventions in Türkiye. To improve this, data collection systems on drowning in Türkiye need to be strengthened via the development a national drowning registry.

TRIAL REGISTRATION

#CRD42022382615.

Pathological Findings in Hanging: Is the Traditional Knowledge Correct?

BACKGROUND

In forensic pathology, asphyxia presents a problem as frequently as it is thorny and challenging. Some knowledge in forensic pathology is still considered to be traditionally acquired and is not critically assessed with modern statistical or technical tools. In this study, we seek to examine the injuries that are considered to be typical of cases of hanging (neck lesions, haemorrhages, and pleural and epicardial petechiae).

METHODS

We evaluated whether there was, indeed, a statistically significant association between these injuries and deaths from hanging as compared to non-hanging deaths. We collected 399 cases (32 deaths by hanging and 367 cases of non-hangings), built contingency tables and performed chi-square tests for each variable (lesion) examined; we also analysed this association in various subgroups of the sample (according to sex, age and weight ranges).

RESULTS

Our results did not deviate from the expected outcome based on traditional knowledge, although they do provide a more detailed demonstration and clarification of traditional knowledge regarding this topic.

CONCLUSIONS

These findings provide valuable insights for future discussion, examination and deepening of knowledge that is traditionally accepted but often undersupported in the literature.

A case of complex asphyxia sheds light on problems in the classification of asphyxias

Death from positional asphyxia is often an accidental event occurring when the victim's body assumes a position which can compromise an effective respiration. Its diagnosis is usually not simple, because it needs to know the exact circumstance in which the body was found and the original positioning of all the body segments. In this case, a 41-year-old man with a history of opioid drugs abuse was found dead in a knee-chest position; the head was down on the floor with the face resting on a plastic bag. Pictures of the scene of death was taken while the body was still in its original position. At first, the main suspicion was that of a fatal overdose. Following the autopsy examination, completed by histological and toxicological examinations, the cause of death was determined as postural asphyxia secondary to intoxication by methadone, in the presence of ischemic heart disease. Some features, moreover, were typical of the death in head down position, and the prolonged knee-chest position was also associated with the obstruction of mouth and nose by the plastic bag, which may have contributed to the asphyxiation. These cases of "combined" asphyxia represent a challenge for the current classifications of asphyxia, which are very variable and not standardized, as we observe from a brief review of the literature. The elaboration of new systems of classification for asphyxias, which must be clear, simple and shareable, is necessary to avoid confusion in categorizing cases that present overlapping between several types of asphyxiation modalities.

Identification of differentially expressed proteins in heart of mouse death from smother based on label-free proteomics

Identification of mechanical asphyxia deaths without obvious injuries is a difficult problem for forensic medicine. This study aimed to identify molecular biological markers to predict death from mechanical asphyxia (smother). We established a smother model of mice by over the head with plastic bag tightly until the mice died and applied label-free proteomic technology to identify differentially expressed proteins (DEPs) in heart. A total of 3307 proteins were quantified, and a Fold Change (FC) > 1.2 (or <1/1.2) and Q value < 0.05 were considered as DEPs. Through comparative analysis, we identified 606 DEPs compared to the control group, comprising 219 upregulated and 387 downregulated proteins. Bioinformatics analysis (MCODE analysis) showed that the candidate proteins were mainly involved in regulation of ribosome function, myocardial contraction and calcium regulation, regulation of coagulation and regulation of mitochondrial oxidative respiration. Seven of these proteins were validated using parallel reaction monitoring (PRM), including fibrinogen alpha chain (FIBA), fibrinogen gamma chain (FIBG), Calsequestrin-2 (CASQ2), NADH dehydrogenase [ubiquinone] 1 alpha subcomplex subunit 11 (NDUAB), NADH dehydrogenase [ubiquinone] 1 alpha subcomplex subunit 3 (NDUA3), NADH dehydrogenase [ubiquinone] 1 alpha subcomplex subunit 13 (NDUAD) and Rab7 (RAB7A). CASQ2 and FIBG were further validated by immunohistochemistry. In conclusion, our results may provide some auxiliary indices for identifying the death from mechanical asphyxia.

Estimation of time since death using cardiac troponin I in case of death due to asphyxia and cardiotoxicity of acebutolol

The objective of this study was to investigate the degradation pattern of cardiac troponin I in rats in vivo, and to determine whether the pattern was dependent on the cause of death, for the purpose of estimating the postmortem interval. The rats were categorized into three distinct groups depending on the factors leading to their demise: the control group, the group experiencing acebutolol-induced cardiotoxicity, and the group affected by asphyxia. The analysis encompassed the isolation and segregation of the protein, subsequently employing Western blotting as a means of visualizing the results. The results revealed a distinct degradation pattern of cTnI into smaller fragments over time, indicating that cardiac troponin I can serve as a reliable marker for estimating the postmortem interval. Furthermore, noteworthy variations were noted in the degradation pattern of cardiac troponin I among the different causes of death, which suggests that this method can also be used to determine whether cardiac failure was the cause of death or not.

Distinguishing Asphyxia from Sudden Cardiac Death as the Cause of Death from the Lung Tissues of Rats and Humans Using Fourier Transform Infrared Spectroscopy

The ability to determine asphyxia as a cause of death is important in forensic practice and helps us to judge whether a case is criminal. However, in some cases where the deceased has underlying heart disease, death by asphyxia cannot be determined by traditional autopsy and morphological observation under a microscope because there are no specific morphological features for either asphyxia or sudden cardiac death (SCD). Here, Fourier transform infrared (FTIR) spectroscopy was employed to distinguish asphyxia from SCD. A total of 40 lung tissues (collected at 0 h and 24 h postmortem) from 20 rats (10 died from asphyxia and 10 died from SCD) and 16 human lung tissues from 16 real cases were used for spectral data acquisition. After data preprocessing, 2675 spectra from rat lung tissues and 1526 spectra from human lung tissues were obtained for subsequent analysis. First, we found that there were biochemical differences in the rat lung tissues between the two causes of death by principal component analysis and partial least-squares discriminant analysis (PLS-DA), which were related to alterations in lipids, proteins, and nucleic acids. In addition, a PLS-DA classification model can be built to distinguish asphyxia from SCD. Second, based on the spectral data obtained from lung tissues allowed to decompose for 24 h, we could still distinguish asphyxia from SCD even when decomposition occurred in animal models. Nine important spectral features that contributed to the discrimination in the animal experiment were selected and further analyzed. Third, 7 of the 9 differential spectral features were also found to be significantly different in human lung tissues from 16 real cases. A support vector machine model was finally built by using the seven variables to distinguish asphyxia from SCD in the human samples. Compared with the linear PLS-DA model, its accuracy was significantly improved to 0.798, and the correct rate of determining the cause of death was 100%. This study shows the application potential of FTIR spectroscopy for exploring the subtle biochemical differences resulting from different death processes and determining the cause of death even after decomposition.

Forensic diagnostic approach of peri-volcanic area fatalities: About two cases at piton de la Fournaise

The Piton de la Fournaise, located on the island of Reunion, is a particularly active volcano that gathers many observers during its eruptions. However, this activity, if not supervised, can involve many risks. During the eruption of Piton de la Fournaise in April 2021, two geology students camped in the peri-eruptive zone. They were found dead 48 h later on the surface and were not in the immediate vicinity of a fumarole. The autopsy revealed superficial traumatic injuries, which did not explain the death. Internal examination of both victims showed a nonspecific asphyxia syndrome and hemorrhagic pulmonary edema, with no cause of death identified. Microscopic analysis confirmed the autopsy findings without providing new diagnostic elements. Toxicological analysis revealed abnormally high levels of sulfurous gases (H₂ S and SO₂ ) in the blood and lungs of both victims. The interpretation of all the forensic data allows us to conclude that the death was secondary to volcanic sulfur gas poisoning, despite the atypical context of this event. However, the meteorological conditions of the night of the event may have caused a stagnation of toxic volcanic gases on the ground, with concentrations high enough to cause fatal intoxication in these two persons, although they were not in a confined environment as is usually the case in cases of sulfur poisoning. The dramatic outcome of this event required a rigorous forensic diagnostic approach and reminds us of the need to respect safety conditions in peri-volcanic areas.

Autopsy findings of suicidal hanging in Mugla, Turkey

Introduction: External and internal autopsy findings of suicidal hanging were evaluated retrospectively in Muğla, Turkey. The relations between macroscopic autopsy findings and age, gender, nature of the ligature, position of the knot, and the ligature marks were assessed. The aim of this study was to describe autopsy findings of the hangings and discuss the regional differences. Method: The reports of 175 hanging autopsies between 2013 to 2018 were evaluated retrospectively. Macroscopic external and internal findings were evaluated and compared statistically. Results: Among the 2534 autopsies, the cause of death was suicide by hanging in 175 cases (6.9%). The male-to-female ratio was 3:1, 76%(n = 133) of the cases were male, 24% (n = 42) were female, the mean age was 44.9(SD = 19.3) years. Suicide by hanging was most prevalent in the 25-44 age group and among men. Complete hanging was more common than incomplete hanging, and softer materials were more commonly used in incomplete hangings. Females utilized soft materials more than males. Males used atypical hanging more than females. Bilateral hemorrhage in the neck muscles was more common with typical hanging. There was a significant relationship between tongue protrusion and hemorrhage at the clavicular head of sternocleidomastoid muscle. Conclusion: In this study, which includes a large series, some regional and gender differences were observed. Careful and detailed macroscopic examination was important to diagnose antemortem vitality findings.

Socio-demographic profile of suicidal hanging deaths in Delhi and the National Capital Region - a retrospective study

The aim of this retrospective socio-demographic analysis is to identify those at higher risk of suicidal hanging in the region of Delhi and the National Capital Region. All deaths due to suicidal hanging from January 2016 to December 2019 reported in the Vardhman Mahavir Medical College and Safdarjung Hospital were included. Suicidal hanging accounted for 2.67% of total autopsied cases; 21-30 years old represented 42.62% of the victims. Male:female ratio was 1.7:1 and 38.37% of cases were from the adjoining areas of Vasant Kunj and Vasant Vihar. Therefore, a preventive strategy should focus concern on young adults, the male sex, and areas of Vasant Kunj and Vasant Vihar.

Exploring metabolic alterations associated with death from asphyxia and the differentiation of asphyxia from sudden cardiac death by GC-HRMS-based untargeted metabolomics

The determination of cause of death is one of the most important tasks in forensic practice. However, asphyxia is a difficult cause of death to determine, especially when the deceased has an underlying disease that can lead to a sudden unexpected death, such as coronary atherosclerotic heart disease (CAHD, which is the leading cause of sudden cardiac death, SCD), because its determination is currently still based on an exclusion strategy. In this study, gas chromatography coupled with high-resolution mass spectrometry (GC-HRMS)-based untargeted metabolomics was employed to obtain the pulmonary metabolic profiles of rats who died from asphyxia and SCD. First, fourteen metabolites were identified to investigate the mechanism of death from asphyxia, and we proposed some explanations that may account for these metabolic alterations, including the perturbation of amino acid metabolism, lipid metabolism, and energy metabolism (TCA cycle). Second, we discovered eight potential biomarkers to differentiate between asphyxia and SCD as the cause of death. The excellent classification performances of the eight individual biomarkers and their combination in fresh lung tissue were observed. Third, we also explored the relative change in the concentration of the eight metabolites and their classification performance in decomposed tissue (at 24 h postmortem). Lactic acid, pantothenic acid, and the combination of the eight biomarkers can be recognized as perfect classifiers to discriminate asphyxia from SCD even when decomposition has occurred. Our results showed that GC-HRMS-based untargeted metabolomics can be used as a promising tool to explore the metabolic alterations of the death process and to determine the cause of death.

Model for the prediction of mechanical asphyxia as the cause of death based on four biological indexes in human cardiac tissue

Determination of mechanical asphyxia as the cause of death has always been difficult for forensic pathologists, particularly when signs of asphyxia are not obvious on the body. Currently, depending on only physical examination of corpses, pathologists must be cautious when making cause-of-death appraisals. In a previous study, four biomarkers-dual-specificity phosphatase 1 (DUSP1), potassium voltage-gated channel subfamily J member 2 (KCNJ2), miR-122, and miR-3185-were screened in human cardiac tissue from cadavers that died from mechanical asphyxia compared with those that died from craniocerebral injury, hemorrhagic shock, or other causes. Expression of the markers correlated with death from mechanical asphyxia regardless of age, environmental temperature, and postmortem interval. However, a single biological index is not an accurate basis for the identification of the cause of death. In this study, receiver operating characteristic curves of the ΔCq values of the four indexes were generated. The diagnostic accuracy of the indexes was judged according to their area under the curve (DUSP1: 0.773, KCNJ2: 0.775, miR-122: 0.667, and miR-3185: 0.801). Finally, a nomogram was generated, and single blind experiment was conducted to verify the cause of death of mechanical asphyxia.

Gender differences in completed suicidal hangings from 2013 to 2018 in Muğla, Turkey

BACKGROUND

Hanging is the most preferred among suicide methods. Although methods vary based on age groups and social and cultural conditions, many studies have reported it as the most common suicide method in Turkey.

OBJECTIVE

Assess autopsy findings of suicidal hangings according to gender differences.

DESIGN

Retrospective, cross-sectional.

SETTING

Local morgue.

SUBJECTS AND METHODS

The autopsy reports of hanging autopsies between 2013-2018. Data was retrospectively collected from autopsy reports. Sociodemographic features, reasons, suicide notes, the news media, and macroscopic autopsy findings were evaluated. Findings were statistically compared by gender.

MAIN OUTCOME MEASURE

Gender differences in autopsy findings.

SAMPLE SIZE AND CHARACTERISTICS

175 autopsy reports of suicide by hanging.

RESULTS

Among 2534 autopsies, 175 (6.9%) cases involved hanging. Most (76%, n=133) were males; the median (interquartile range) age was 42.0 (29.5), the male/female ratio was 3:1. Suicide notes were found in 42 cases; 81 (24%) were from men. The most common reason for suicide was a mental illness (n=51, 29.2%), followed by family problems (n=26, 14.9%), but the cause was unknown in 42 cases (24.0%). More than half of the events were covered in the news media (58.9%). Rope was most commonly used with women preferring a softer material. Men were more frequently single than women. Men were more frequently single and not actively working than women (P=.026 and P≤.001, respectively). The incidence of atypical hanging was higher for males than females (P<.05).

CONCLUSION

The findings showed that there were some statistically significant differences in socioeconomic and mental health factors between men and women in hanging suicide. This study may serve as the basis for more comprehensive studies to investigate the causes of suicide.

LIMITATIONS

Single-center, retrospective.

CONFLICT OF INTEREST

None.

Distinguishing between homicide and suicide knots and ligatures: A comparative analysis of case and survey data

Distinguishing between suicide and homicide can be challenging owing to ambiguous and confusing case details. In particular, there is a paucity of useful information comparing homicide and suicide knots and ligatures in the literature. Multiple knot and ligature characteristics have not been recognized previously because complete and accurate information has been lacking. Ninety external tying cases (mainly homicide) and 56 cases involving self-tying (mainly suicide) were reviewed to compare multiple knot and ligature characteristics. Additionally, 189 survey volunteers performed four standardized external tying tasks and two self-tying tasks, yielding comparison data from more than 1500 knots. Using all available data, it was determined that the differences between external and self-tying included types of knots, ligature configurations, ligature tensions, wrist gaps, wend lengths, knot access, external anchoring, and other indicators. These differences are presented in a proposed analysis checklist inspired by medical and psychiatric protocols. The checklist contains 14 potential characteristics for head and neck bindings, 14 potential characteristics for wrists and arms, nine ankle and leg characteristics, and four linkage details. The proposed checklist can be expanded and fine-tuned as more data are accumulated. It offers experienced knot analysts an additional tool to assist in drawing conclusions, which then can be related to other case evidence by investigators.

Patricide and overkill: a review of the literature and case report of a murder with Capgras delusion

Despite being an infrequent crime, parental homicide has been associated with schizophrenia spectrum disorders in adult perpetrators and a history of child abuse and family violence in adolescent perpetrators. Among severe psychiatric disorders there is initial evidence that delusional misidentification might also play a role in parricide. Parricides are often committed with undue violence and may result in overkill. The authors present the case of an adult male affected by schizoaffective disorder and Capgras syndrome who committed patricide. Forensic pathologists classify such cases as overkill by multiple fatal means comprising stabbing, blunt trauma and choking. Accurate crime scene investigations coupled with psychiatric examinations of perpetrator allow reconstruction of the murder stages. This overkill case is discussed in the context of a broad review of the literature.

Identification of the miRNA-3185/CYP4A11 axis in cardiac tissue as a biomarker for mechanical asphyxia

Death by mechanical asphyxia is one of the most difficult conclusions to make in forensic science, especially in corpses displaying slight or no trauma to the surface of the body. Therefore, death by mechanical asphyxia is difficult to prove in medico-legal practice. MicroRNAs (miRNAs) are a class of small, non-coding RNAs involved in the regulation of numerous physiological and pathological cellular processes. In the present study, we demonstrate that significantly increased expression of miR-3185 in cardiac tissues was detected among cases of mechanical asphyxia compared to case of craniocerebral injury, hemorrhagic shock, sudden cardiac death and poisoning. We observed no correlation between the expression of miR-3185 and postmortem interval, age or temperature. Further work indicated that CYP4A11 is a putative target gene of miR-3185 and expressed at a relatively low level in cardiac tissue specimens from cases of mechanical asphyxia compared with specimens from cases of craniocerebral injury, hemorrhagic shock, sudden cardiac death and poisoning. Our results suggest that the miRNA-3185/CYP4A11 axis is associated with mechanical asphyxia-induced death and may provide new insight into asphyxial death investigations.

Cases of asphyxia in children and adolescents: a retrospective analysis of fatal accidents, suicides, and homicides from 1998 to 2017 in Hamburg, Germany

PURPOSE

Injury-related asphyxia is one of the most common causes of death in children in Germany. However, only a few systematic studies have analyzed the causes and circumstances of asphyxia in children and adolescents.

METHODS

All cases of asphyxia in children and adolescents (0-21 years of age) among the Hamburg Legal Medical Department's autopsy cases from 1998 to 2017 were retrospectively analyzed with special focus on how often external findings were completely absent.

RESULTS

Among 249 cases of fatal asphyxia, 68% were accidents, 14% were suicides, and 13% were homicides. Most of the cases involved boys. Adolescents and young adults aged 15-21 years represented the main age group. Drowning was the leading mechanism of asphyxia. Younger age was associated with less frequent detection of external signs of asphyxia in the postmortem external examination. Petechial hemorrhages were the most common visible external indication of asphyxia. No external findings indicative of asphyxia were present in 14% of the cases.

CONCLUSION

Asphyxia in children and adolescents often involves accidents. However, postmortem external examination alone is insufficient to identify asphyxia and the manner of death.

Fracture patterns of the hyoid-larynx complex after fatal trauma on the neck: retrospective radiological postmortem analysis of 284 cases

PURPOSE

Fatal trauma on the neck occurs frequent in forensic cases and often results in fractures of the hyoid-larynx complex. The aim of the present study is to provide an overview of fractures in the hyoid-larynx complex that occur due to fatal trauma on the neck and can be observed by radiological evaluation.

METHODS

Radiological images from a forensic radiological database created in -BLINDED- were used for analysis. Hyoid-larynx complexes were explanted in 284 individuals who accordingly to the forensic pathologist allegedly died from fatal trauma on the neck. These explants were imaged with conventional X-rays in eight directions and a CT scan. Radiological images were analyzed for fractures, dislocations, joints, and anatomical variations by a trained analyst and a radiologist.

RESULTS

In 281/284 cases, the hyoid bone and, in 252/284 cases, the thyroid cartilage could be assessed. In 56 victims (20%), the hyoid bone was fractured, 55 times in the greater horn, 1 fracture in the body. The calcified superior horn of the thyroid showed a fracture in 101 victims (40%). The calcified cricoid cartilage was fractured in one case. Multiple fractures were found in 31/284 cases (11%). Joints between the greater horn and body of the hyoid were present in 74%.

CONCLUSION

Trauma on the neck leads most frequently to fractures of the superior horn of the thyroid cartilage and second most to fractures in the greater horn of the hyoid bone. (Forensic) radiologists should be aware of uncommon fracture locations, anatomical variations, and dislocations in the hyoid-larynx complex.

Suicide by hanging: Results from a national survey in Switzerland and its implications for suicide prevention

BACKGROUND

Hanging is a frequent suicide method, but developing measures to prevent suicide by this method is particularly challenging. The aim of this study is to gain new knowledge that would enable the design of effective of measures that would help prevent suicide by hanging.

METHODS

A total of 6,497 suicides registered across the eight Swiss Forensic Institutes (IRM) were analysed. Of these, 1,282 (19.7%) persons hung themselves. T-test and chi-square tests. and chi-square tests were used to analyse …(or determine, or investigate) …group differences regarding sociodemographic variables and triggers.

FINDINGS

Men and women who hung themselves showed no significant differences in sociodemographic variables. However, women were significantly more likely to have a psychiatric illness history, whereas men were more likely to have somatic diagnoses. In controlled environments, people used shelves, plumbing and windows more often than beams, pipes, bars and hooks to hang themselves. Compared with other suicide methods, hanging was more likely to have been triggered by partner and financial problems.

CONCLUSIONS

Suicide by hanging can be best prevented in institutions (e.g. psychiatric hospitals, somatic hospitals, prisons). These institutions should be structurally evaluated and modified with a primary focus on sanitary areas, windows and shelves. Otherwise, it is important to use general suicide prevention measures, such as awareness raising and staff training in medical settings, low-threshold treatment options and regular suicide risk assessment for people at risk.

Profile of unnatural mortalities in Northern part of Ghana; a forensic-based autopsy study

INTRODUCTION

Bereavement is usually difficult to come to terms with. However, sudden, violent or traumatic death can be particularly hard to accept for any family, group or nation as a whole. A retrospective study of all autopsies on unnatural and traumatic deaths of medico-legal importance was made at the Komfo Anokye Teaching Hospital from 2008 to 2016.

METHODS

Information on cause of death and other relevant detail as well as demographics were extracted from the Autopsy Log Book of the department of pathology, Komfo Anokye Teaching Hospital where data on cause of death from autopsy findings and other relevant data were gathered and kept secured. The data was then analyzed using SPSS version 22.

RESULTS

Findings from the study showed that Road Traffic Accidents (RTA) contributed to 58.51% of the total forensic death cases of a total of the 1470 registered unnatural deaths. Males accounted for 75.37% of deaths as compared to 24.63% for females. The mean age for the various cause of unnatural deaths was 34 years. The age ranges from a minimum of 0.02 year (1 week) to a maximum of 97 years with median age of 33. The modal age is 30 years with 75 cases. 1108 males and 362 females were involved, resulting in a gender ratio of 3:1. The age group 30-39 recorded the highest percentage of deaths due to Hanging, Gunshots, RTA and Falls with 22.45%, 34.69%, 21.75% and 25.44% respectively. Children aged ≤9 recorded the highest number of deaths due to chemical poisoning and drowning with 25.5 8% and 40.00% of cases respectively. People in the extremes of ages (≤9 and ≥ 70) recorded the least number of death cases by percentage.

CONCLUSION

Road traffic accident is therefore the leading cause of unnatural traumatic deaths as it accounted for more than half of all unnatural traumatic death cases reported in the forensics department. Men, especially the youth are also more prone to violent unnatural deaths compared to women in general. It is shown that, men die more in the various categories than women. Males are likely to die on the average, 3 times more than the females by any of the manner of deaths.

Pediatric constrictive asphyxia a rare form of child abuse: A report of two cases

We present two cases of infants who died under suspicious circumstances. After clinical and legal investigations, non-accidental constrictive asphyxia inflicted by one of the parents was established. The first case presents a to date not yet reported, unique mechanism of trauma. In order to stop his daughter from crying, the father admitted that he sometimes sat on his baby while she was lying on the bed. Occasionally increasing his force by pulling with his hands on the bottom of the bed. In the second case tight swaddling and encircling chest compression was the causative mechanism. In both cases the father was sentenced to imprisonment with mandate psychiatric care. Only two previous reports of this uncommon and relatively unknown cause of child abuse, called constrictive asphyxia, are known. In all reported cases static loading of the chest resulted in rib fractures and demise of the child. This rare abusive mechanism should be known to pediatric radiologists and pathologists.

A particularly complex case of matricide by means of plastic bag suffocation: Case report

A rare case of homicide with plastic bag suffocation is presented in which forensic genetic investigations were carried out on the inner surface of a plastic bag placed over the head of an elderly woman, bedridden after a stroke. The results obtained suggested that she had been murdered and hinted at the perpetrator of the crime. In fact, it emerged that biological traces left by the victim matched those of her principal caregiver, her psychotic daughter, who later confessed to the crime. The old woman also had a son affected by a serious illness, whose genetic profile was found on the same bag. In a later interview, he stated that his sister had tried to kill him too, thus confirming the genetic findings and allowing the investigators to hypothesise that the daughter had used the same means to try to kill him. Based on these results, the usefulness of forensic genetic testing when investigating complex plastic bag suffocation deaths is highlighted. This peculiar case deserves interest, since no murder of this kind has ever been reported in the Italian forensic literature.

The epidemiology of drowning in low- and middle-income countries: a systematic review

Background

According to the World Health Organization, drowning is the 3rd leading cause of unintentional injury-related deaths worldwide, accounting for 370,000 annual deaths and 7% of all injury-related deaths. Low- and middle-income countries are the most affected, accounting for 91% of unintentional drowning deaths.

Methods

The authors performed a systematic review of literature indexed in EMBASE, PubMed, Web of Science, Cochrane Library, and Traumatology journals formerly indexed in PubMed in January 2014 and again in September 2016. Abstracts were limited to human studies in English, conducted in low- and middle-income countries, and containing quantitative data on drowning epidemiology.

Results

A total of 62 articles met inclusion criteria. The majority of articles originate from Asia (56%) and Africa (26%). Risk factors for drowning included young age (<17–20 years old), male gender (75% vs. 25% female), rural environment (84% vs. 16% urban), occurring in the daytime (95% vs. 5% night time), lack of adult supervision (76% vs. 18% supervised), and limited swimming ability (86% vs. 10% with swimming ability). There was almost equal risk of drowning in a small body of water versus a large body of water (42% ponds, ditches, streams, wells; 46% lakes, rivers, sea, ocean).

Conclusion

Drowning is a significant cause of injury-related deaths, especially in LMICs. Young males who are unsupervised in rural areas and have limited formal swimming instruction are at greatest risk of drowning in small bodies of water around their homes. Preventative strategies include covering wells and cisterns, fencing off ditches and small ponds, establishing community daycares, providing formal swimming lessons, and increasing awareness of the risks of drowning.

Electronic supplementary material

The online version of this article (doi:10.1186/s12889-017-4239-2) contains supplementary material, which is available to authorized users.

Deaths due to carbon monoxide poisoning in Aydın, western Turkey

The purpose of this study was to retrospectively investigate cases of death due to carbon monoxide (CO) poisoning in the province of Aydın in western Turkey. The study investigated the cases of death due to CO poisoning that were autopsied at the Adnan Menderes University Department of Forensic Medicine from 2002 to 2012. The mean age of the 33 autopsied cases of fatal CO poisoning was 60.30 ± 4.082 years, and 75.8% of the cases were men. The highest level of CO in blood was 79.7%. It was found that most of the CO poisoning deaths were related to accidents.

Hanging Deaths: A Retrospective Study Regarding 260 Cases

Hanging is a form of asphyxia caused by external pressure on the upper airways deriving from a band tightened by the gravitational weight of the body. During a 33-year period from 1983 to 2015, there were 260 hanging deaths examined at the Brescia Institute of Forensic Medicine (Northern Italy), which represented approximately 40% of all the asphyxial deaths recorded during this period. Almost all of the cases were represented by suicidal events, 1 case was a homicide event and there also was a case of sexual asphyxia. Eighty-two percent of the victims were men; 18% were women. There was an increasing tendency in the ages between 20 and 60 years, and the highest number of cases was observed in the 41- to 50-year age group (23% of the cases). The most common place chosen by the victim was the home setting followed by isolated outdoor places. The most common ligature material was a rope. The pathological findings were evaluated in all cases.

A 10-year retrospective study of suicide in Sikkim, India: Sociodemographic profile and risk assessment

OBJECTIVE

The present study had been undertaken to investigate the sociodemographic profile of individuals who had committed suicide in Sikkim which may throw light on the vulnerable groups.

MATERIALS AND METHODS

Ten-year suicide data (2006-2015) obtained from Police Headquarters, Crime Branch, Gangtok, have been statistically evaluated to study the sociodemographic profile.

RESULTS

The results showed that out of 1604 suicide cases recorded for the past 10 years, 1051 were males (65.5%) and 553 (34.5%) were females. Suicide was found to be common among the age group of 21-30 years (24.4%), Rai community (15.8%), population of rural areas (82.6%), and among the population of eastern districts (50.6%). Hanging (94.8%) was found to be the most common method adopted for suicide.

CONCLUSION

The study provides preliminary information about the vulnerable groups for suicide in the state which may be vital for taking necessary steps for its prevention shortly.

Suicidal Smothering by Rubber Latex Gloves and Handkerchief

Asphyxial deaths are common in forensic practice, being sustained by a variety of mechanisms that cause an oxygen deficiency to the brain. Several classification models have been proposed in the literature, the most recent one being that of the International Network for Forensic Research Group (INFOR). This report describes an unusual case of suffocation where the obstruction of the airways was caused by a gag formed of three latex gloves and a handkerchief. The manner of death (differential diagnosis between homicide and suicide) and the different alternatives of classification are discussed.

Patterns of accidental deaths in Kuwait: a retrospective descriptive study from 2003-2009

Background

Accidents are a preventable cause of death. Unfortunately it accounts for a large number of deaths in many societies. In Kuwait, road traffic accidents (RTA) is the leading cause of death in young people. The study investigated the patterns of accidental deaths in Kuwait, one of the Gulf States which incorporates a wide variety of multi-ethnic communities.

Methods

The study was retrospective from 2003–2009. Data of forensic cases were collected from the general department of criminal evidence (GDCE) in the ministry of interior (MOI).We attempted to find out causes of accidental death and the prevelance of each cause. Furthermore, the relationship of demographic factors (eg. Age, sex, marital status and nationality) with each cause of accidental death in Kuwait were studied.

Results

The material of this study constituted a total of 4886 reported accidental deaths referred for Medico-legal examination. Road traffic accidents was by far the most prevalent cause of death (64.6%) followed by fall from height (13.1%). Poisoning and mine explosions were amongst the least common causes.

Conclusion

The government of Kuwait needs to take strong measures to promote safety in the workplace and households by educational campaigns.

Fatal mechanical asphyxia induces changes in energy utilization in the rat brain: An (18)F-FDG-PET study

PURPOSE

This study was designed to evaluate changes in brain glucose metabolism in rats following ligature strangulation.

MATERIALS AND METHODS

Thirteen male Wistar rats were used in the present study, divided into control (n=7) and asphyxia groups (n=6, ligature strangulation). Positron emission tomography (PET) with 2-deoxy-2-[(18)F]fluoro-D-glucose ((18)F-FDG) was used to evaluate brain glucose metabolism. Rats were scanned for PET-CT, and image data co-registered with a T2WI MRI template using SPM8 software. Image J was employed to draw regions of interest (ROIs) from the MRI template and acquire ROI activity information from the PET images.

RESULTS

In the asphyxia group vs. controls, (18)F-FDG uptake (FU) was decreased in the substantia nigra (25.26%, p<0.001), rhombencephalon (pons/medulla oblongata, 13.92%, p<0.01), hypothalamus (22.06%, p<0.01), ventral tegmentum (10.12%, p<0.05) and amygdala (12.74%, p<0.05); however, FU was increased in motor (18.21%, p<0.05) and visual cortices (19.2%, p<0.05).

CONCLUSIONS

The glucose metabolism distribution map in the asphyxiated rat brains were substantially changed versus controls. PET with (18)F-FDG can demonstrate excitement and inhibition of different brain areas even in cases of ligature strangulation.

Child drowning deaths in Aydin province, western Turkey, 2002-2012

INTRODUCTION

Drowning, a major public health problem worldwide, occurs as an accident, suicide, or homicide. Deaths with an accidental origin are common in childhood in the 0-18 age group. In our study, pediatric drowning cases for whom a postmortem examination and an autopsy were conducted by Adnan Menderes University Department of Forensic Medicine were evaluated. The characteristics were determined and compared with domestic and foreign studies.

MATERIALS AND METHODS

A total of 39 cases in the 0-18 age group in Aydın between 2002 and 2012 were analyzed regarding age, gender, cause of death, origin, the accident scene, and the month in which the death occurred.

RESULTS

Of the drowning cases, 33 (84.6 %) were male, and 6 (15.4 %) were female. The average age was 9.08 years, and drowning is most common in the 0-4 age group (33.3 %). The scene of the accident was an irrigation channel in 43.5 % of the cases, a river in 15.3 %, a sea in 12.8 %, a pool in 10.2 %, and a lake or pond in 7.69 %.

CONCLUSION

Drowning deaths are a serious and preventable public health problem worldwide. There are strong correlations among lack of adult supervision, lack of precautions, and neglect.

Evaluation and management of pediatric near-hanging injury

INTRODUCTION

Children surviving a strangulation event are unique from adults in that they are at risk for significant airway compromise due to the smaller relative size of their airways. To date, no study has specifically evaluated the laryngeal findings and management of pediatric near-hanging patients.

METHODS

A retrospective chart review was performed on all near-hangings presenting to the a tertiary care children's hospital from January 2001 until June 2010. Demographic information was compiled in addition to laryngeal findings.

RESULTS

Sixteen children were identified. Four had a documented laryngeal injury, one of which was a major injury requiring a tracheotomy.

CONCLUSION

Laryngeal examination should be standard of care for any child presenting after a near-hanging event.

Anatomopathological findings in hangings: a retrospective autopsy study

BACKGROUND

In this retrospective autopsy study, we aimed to review the anatomopathological findings observed in cases of hanging death for a five year period and to evaluate the role of contributing factors such as age, sex, type of hanging and localization of the ligature knot.

METHODS

Autopsy reports of 102 hanging cases performed by the Department of Forensic Medicine, Faculty of Medicine of Pamukkale University, between January 2007 and September 2011, were retrospectively reviewed.

RESULTS

In the 102 hanging cases 73 of the victims were males (71.6%) and 29 (28.4%) were females, with a mean age of 40.97 ± 17.41 years. All cases were suicidal hanging. Fifty four cases (52.9%) were typical hanging, with the ligature knot located posteriorly. There were petechial hemorrhage on the face and eye lids in 46 (45.1%), ecchymoses of the cervicale muscles in 43 (42.2%), and fractures of the neck structure(s) in 69 cases (67.6%).

CONCLUSIONS

The incidence of neck structure fractures increased with age. In addition, there was no correlation between the incidence of neck structure fractures and sex or type of hanging.

Fracture of the cricoid as a potential pointer to homicide. A 6-year retrospective study of neck structures fractures in hanging victims

The distinction of a suicidal hanging from a simulated hanging following a homicidal strangulation is highly challenging. The present study evaluates the fracture of the cricoid cartilage as a potential pointer toward homicide. Despite the numerous studies on neck structures fractures in hanging, this is the first study to concentrate on the cricoid cartilage. Neck structures fractures in all cases of suicidal hanging over a 6-year period were retrospectively reviewed (231 cases) and a comparison with homicidal hangings (4 cases) and homicidal no-hanging strangulations cases (52 cases) was performed. Overall, neck structures fractures were found in 23.4% of suicidal cases (54 cases). The cricoid cartilage was intact in all suicidal hangings. The general incidence of fractures in homicidal no-hanging strangulation was 65.4% (34 cases),with an incidence of fracture of the cricoid cartilage of 20.6%. By compiling studies from the literature, only one cricoid cartilage over 2700 suidical hanging cases was found, whereas an incidence of 5 to 20% is found for homicidal strangulation. It is therefore proposed that the presence of a fracture of the cricoid in an apparent suicidal hanging should be considered highly suspicious.

An unusual suicide case by combination of choking and hanging

A 40-year-old man was found dead in his prison cell, hanging on a twisted bandage tightened around his neck. His permanent metal tracheostomy tube was completely corked with a piece of paper wrapped with transparent cellophane from a cigarette case. After police investigation and complete autopsy, suicide was determined as the manner of death. Although suicides by 1 form of asphyxia are relatively common, combination of several different forms of asphyxia is far less frequent. We present this unusual and very rare case of suicide by combination of 2 forms of asphyxia, that is, choking and hanging, along with autopsy findings and discussion.