Autopsy Study Research Articles

Impact of Position in Family on Suicide: A Case-Control Psychological Autopsy Study among Chinese Rural Youths

Introduction. Suicide remains an important public health issue in China. Existing literature on the relationship between individual-familial variables and suicide risk mainly focused on family socioeconomic status, and few studies analyzed the effect of position in family on suicide. In this study, we aimed to explore the association between position in family and suicide among Chinese rural youths. Methods. We conducted a case-control psychological autopsy study. The data collection yielded 392 suicide cases aged 15-34 years and 416 community living controls within the same age range. Personal position in family was assessed by the question “How do you evaluate his/her position in the family?” and categorized as high, general, and low to reflect the relative position in family. Logistic regression models were conducted to explore the association between position in family and suicide risk. Results. The results showed that compared with females (males) having a high position in family, females (males) with a low position in family were 7.1 (9.1) times more likely to commit suicide ( p < 0.01 ). Mental disorders, social support, and coping strain were potentially important mediating factors linking position in family to suicide, with certain heterogeneity among males and females. Low coping strain played the most important role in underlying the association between a low position in family and suicide for both females and males, accounting for 55% (28%) of the contribution to the total effect for females (males). Subgroup analysis revealed that low position in family had more significant impacts on suicide risk among married youths and those with low education levels. Conclusion. The effect of position in family on suicide should receive greater consideration when predicting suicide in rural China. Possible mechanisms underlying the effect of position in family on suicide include mental status, social support, and coping strain.

SARS-CoV-2 spread to endocrine organs is associated with obesity: an autopsy study of COVID-19 cases

PurposeSARS-CoV-2 infection may be limited to the respiratory tract or may spread to multiple organs. Besides disease severity, factors associated with virus spread within the host are elusive. Here, we tried to identify features associated with SARS-CoV-2 spread to endocrine organs.MethodsIn a retrospective autoptic cohort of 51 subjects who died because of COVID-19, we analyzed the severity and type of lung pathology, patients’ features and the detection of virus in thyroid, testis, adrenal gland, pancreas, anterior pituitary, and the white adipose tissue (WAT).ResultsThe SARS-CoV-2 genome was detected in endocrine organs of 30/51 cases. The anterior pituitary and WAT were most frequently positive for virus. While pathological features of lung were not associated with the presence of virus in endocrine organs, obesity (BMI > 30) was significantly associated to virus detection in pancreas (p = 0.01) and thyroid (p = 0.04). WAT infection was detected more frequently in males (p = 0.03).ConclusionIn subject with obesity dying of COVID-19, the virus frequently spreads to endocrine organs. The findings emphasize the need for optimal treatment of patients with obesity at the very onset of COVID-19. Since post-COVID conditions remain a major issue worldwide, a rigorous follow-up of endocrine function—especially of thyroid and pancreas—is advocated in subjects with obesity.

Correlation Between the Level od Atherosclerosis and Pathological Features of Coronary Artery Disease: A Study of 100 Autopsy Cases

Objective: Atherosclerosis is a generalized, chronic disease of large and medium-sized muscular elastic arteries. Relation between intensity of atherosclerosis and coronary artery disease, and risk factors of atherosclerosis could not been revealed completely by autopsy studies. We aimed to renew this shortage of knowledge with our autopsy study prospectively. 
 Methods: One hundred cases were autopsied within 48 h after death. Atherosclerotic risk factor data were collected including age, gender, height, weight, smoking and any chronic coronary artery disease. Atherosclerosis severity was evaluated macroscopically by examining the inner surfaces of the vascular lumens and revealed with postmortem pathological findings of coronary artery disease.
 Results: The mean age was 42 ± 22 years. Seventy-four percent of cases were male, while 26% were female. Smoking duration ranged from 1 to 50 years with a mean duration of 17 ± 12 years. Existence of atherosclerosis in main vessels were also in correlation with age, duration of smoking and BMI (Body Mass Index) (p

The Pattern of Injuries in Riders of Fatal Motorized Two-Wheeler Road Traffic Accidents: An Autopsy Study.

The Pattern of Injuries in Riders of Fatal Motorized Two-Wheeler Road Traffic Accidents: An Autopsy Study.

Evaluation of the cardiovascular risk induced by cannabis use from a series of 43 autopsy cases.

The aim of this monocentric observational autopsy study was to confirm the existence of a link between cannabis use and cardiovascular risk. It was based on the analysis of autopsy findings, cardiovascular pathological findings, and toxicological data in 43 autopsy cases of people who died with tetrahydrocannabinol (THC) in their blood over a 2-year period. Hair analysis was performed when available (n = 40) to distinguish between occasional and chronic cannabis use and to take into account other possible exposures, including smoking, drug consumption, and the use of other drugs of abuse (mainly cocaine, heroin, and amphetamine). A statistically significant association (Fisher's exact test, p < 0.001) was found between cannabis use, an undetermined manner of death, and the presence of an arrhythmogenic cardiac condition. An association was also found between cannabis use and the presence of advanced coronary heart disease (p = 0.01), heart disease (including ischemic heart disease, p = 0.003), or cardiomyopathy (p = 0.01). Through its systemic vascular action, cannabis could be a factor in triggering sudden death in subjects with arrhythmogenic cardiac conditions. In view of this finding, the mode of death of subjects who died in the presence of THC in the blood would in most cases be an "accident." These results highlight the potential adverse cardiac effects associated with cannabis use.

Men's Behavior and Communication in the Days Prior to a Suicide-A Psychological Autopsy Study.

Men show a significantly higher suicide rate, are less often recognized as persons at risk, and are more difficult to reach for suicide prevention interventions. Warning signs and deterioration in mental health are often not recognized by their surroundings. This study aims to retrospectively analyze the behavior and communication of men before a suicide, how relatives noticed changes, and how the interaction was perceived. N = 15 individuals who lost a close male relative to suicide were interviewed using psychological autopsy interviews. The interviews were evaluated following a deductive-inductive approach while using a comprehensive category system. The majority of men showed changes in behavior before the suicide, especially social withdrawal, irritability, and generally a deterioration in mental health. In fact, men did communicate their suicidal thoughts before they died through suicide, but mainly indirectly. While only one-third of the deceased made preparations before suicide, the majority of relatives noticed a deterioration in the mental health of the individual as well as increased alcohol and substance use. Men show signs of suicide, which are little recognized by their surroundings. Suicide prevention interventions should be adapted more to the needs of men.

Review of the role of the endogenous opioid and melanocortin systems in the restless legs syndrome.

Restless legs syndrome (RLS) is responsive to opioid, dopaminergic and iron-based treatments. Receptor blocker studies in RLS patients suggest that the therapeutic efficacy of opioids is specific to the opioid receptor and mediated indirectly through the dopaminergic system. An RLS autopsy study reveals decreases in endogenous opioids, β-endorphin and perhaps Met-enkephalin in the thalamus of RLS patients. A total opioid receptor knock-out (mu, delta and kappa) and a mu-opioid receptor knock-out mouse model of RLS show circadian motor changes akin to RLS and, although both models show sensory changes, the mu-opioid receptor knock mouse shows circadian sensory changes closest to those seen in idiopathic RLS. Both models show changes in striatal dopamine, anaemia and low serum iron. However, only in the total receptor knock-out mouse do we see the decreases in serum ferritin that are normally found in RLS. There are also decreases in serum iron when wild-type mice are administered a mu-opioid receptor blocker. In addition, the mu-opioid receptor knock-out mouse also shows increases in striatal zinc paralleling similar changes in RLS. Adrenocorticotropic hormone and α-melanocyte stimulating hormone are derived from pro-opiomelanocortin as is β-endorphin. However, they cause RLS-like symptoms and periodic limb movements when injected intraventricularly into rats. These results collectively suggest that an endogenous opioid deficiency is pathogenetic to RLS and that an altered melanocortin system may be causal to RLS as well.

COVID-19 as a potential trigger for refractory arrhythmias and electrical storm in a patient with dilated cardiomyopathy: a case report

Arrhythmias occur both in the acute coronavirus disease 2019 (COVID-19) and in the post-acute period, which may be associated with the long-term SARS-CoV-2 persistence. In a case report, patient with primary dilated cardiomyopathy, an implanted cardioverter-defibrillator, recurrent ventricular arrhythmias, and an electrical storm are presented. The patient was repeatedly hospitalized in a city hospital, where electrical cardioversion, antiarrhythmic therapy, radiofrequency ablation of recurrent ventricular tachycardia regions, including emergency ("lifesaving") combined catheter radiofrequency destruction of the electrical storm substrate, was performed. Subsequently, against the background of ongoing postoperative therapy, massive pulmonary embolism (PE) suddenly developed, which led to the death. Autopsy established that the cause of the patient’s death was massive pulmonary embolism; SARS-CoV-2 and enterovirus was detected in the myocardium. Based on an autopsy study, the patient was diagnosed with primary dilated cardiomyopathy with secondary active chronic lymphocytic myocarditis.

Perinatal hypoxic-ischemic brain injury: What's behind the "ribbon effect"?

Ribbon effect describes a perceived macroscopic color reversal of the gray and white matter, characterized by a pale cortex and diffusely dusky underlying white matter. This finding is thought to be unique to the perinatal period and indicative of hypoxic-ischemic injury. However, the clinical and microscopic correlates of this macroscopic finding have not been clearly defined. A 21-year retrospective study of autopsies was performed. Ribbon effect was seen in 190 subjects, ages 20 weeks gestation to 9.5 months adjusted age. Clinical associations and radiographic findings were similar in ribbon effect cases and controls. A variety of histologic findings were observed including acute neuronal injury, diffuse white matter gliosis, and white matter necrosis. Only white matter vascular congestion was significantly correlated to the macroscopic severity of ribbon effect; the severity of white matter injury and acute neuronal injury were not significantly correlated to ribbon effect. While hypoxic-ischemic changes were present in nearly all cases of ribbon effect, the location, severity, and chronicity of these changes varied considerably, and similar findings were observed in controls. The presence of ribbon effect therefore does not predict microscopic findings apart from vascular congestion, highlighting the importance of microscopic examination in perinatal brain autopsies.

Pesticides and passion: a qualitative psychological autopsy study of suicide in Guyana

The suicide rate in Guyana has consistently ranked in the top ten globally, yet there is only limited literature related to the context in which these suicides occur. This study aims to better understand the psychosocial circumstances and characteristics of suicides in Guyana. This case series study utilised a qualitative psychological autopsy method. One to three informants per deceased person (N=31) were interviewed regarding the lives of 20 Guyanese who died by suicide (14M, 6F, aged 10-74 years). Interpretative Phenomenological Analysis was utilised for the data. Four superordinate themes were identified: Interpersonal Conflict, Trauma, Health, and Unknown Reasons. Interpersonal conflict included subordinate themes of Domestic Abuse, Marital Separation, and Financial Disputes. Health included subordinate themes of Physical Health and Mental Health. Pesticide poisoning was the method used by Guyanese people whose suicide was triggered primarily by interpersonal conflict. The findings illustrate the complexities of suicide in Guyana and the importance of adopting a biopsychosocial perspective to suicide prevention. Suicide prevention should include mental health and suicide literacy training of medical professionals. It is recommended that the importation of highly toxic pesticides be restricted, and that less toxic substitutes be promoted. Convenience sampling, recall bias, and limited informants are limitations of this study. Future research should focus on suicidal behaviour using larger sample sizes. This research was supported by an Australian Government Research Training Program Scholarship through Griffith University Australia.

A RETROSPECTIVE STUDY OF PATTERN OF MEDICOLEGAL AUTOPSIES CONDUCTED AT KADAPA, ANDHRA PRADESH

Background: Death of an individual is a serious and grave loss to the family and community at large in whatever form it occurs whether natural or unnatural. Analysis of unnatural deaths helps in understanding the causes, manner, and modes of deaths thereby formulating and implementing a proper policy to reduce them. Methods: This is a retrospective study of autopsies conducted over 3 years (2020–2022) in the mortuary of Government Medical College, Kadapa. During this period, 1857 autopsies were performed. All the necessary data were collected from the police requisitions, inquest reports, hospital case sheets, medicolegal register, and postmortem reports in a performed pro forma. Results: Out of the 1857 cases, high proportion was in the age group of 21–30 years (40.26%), followed by 31–40 years (18.68%). Ratio of male to female was 2.57:1. Majority belonged to Hindu community (67.69%) and most of the subjects hailed from the rural areas (63.14%). Majority were married (70.86%). The most common cause of death was road traffic accidents (45.07%), followed by poisoning (15.67%). The manner of deaths was accidental deaths in most cases (57.78%) followed by suicidal deaths (36.02%). Conclusion: The present study reveals that most cases were in 21–30 years age group. The proportion of males outnumbered females and the subjects were mostly married and were from rural areas. Road traffic accidents were common cause of death in males and burns were the common cause of death in females.

Apolipoprotein E ε2 allele is associated with lower risk of carotid artery obstruction in a population-based autopsy study

IntroductionApolipoprotein E (APOE) ε4 allele has been associated with higher carotid atherosclerosis risk, while the APOE-ε2 seems to decrease this risk. Data from autopsy studies, where carotid arteries can be evaluated in their full extension, is scarce. Therefore, we investigated the association between APOE alleles and direct morphometric measurements of carotid atherosclerosis in an autopsy study with an admixed sample. MethodsWe measured the intima-media thickness (IMT) and stenosis of the common (CCA) and internal carotid (ICA) arteries. The APOE polymorphisms were determined by real-time polymerase chain reaction. Participants were classified into three groups according to the APOE alleles (ε2, ε3, and ε4). We evaluated the association between APOE groups and carotid atherosclerosis using adjusted regression models and included interaction terms of APOE alleles with age, sex, and race. ResultsWe evaluated 1,850 carotid artery samples from 185 participants (mean age=75±12 years old, 55% female, and 71% White). The APOE-ε2 group (n=17) had a lower carotid obstruction and a lower number of severe stenoses (≥ 70%). Having at least one ε4 allele (n=51) was not associated with carotid atherosclerosis. APOE alleles were also not associated with carotid IMT. Age, sex, and race did not modify these relationships. ConclusionAPOE-ε2 carriers had a lower percentage of carotid obstruction and less severe stenosis. APOE-ε4 was not related to a higher risk of carotid atherosclerosis in this cross-sectional population-based autopsy study.

Glial cell response and microthrombosis in aneurysmal subarachnoid hemorrhage patients: An autopsy study.

Neuroinflammation and microthrombosis may be underlying mechanisms of brain injury after aneurysmal subarachnoid hemorrhage (aSAH), but they have not been studied in relation to each other. In postmortem brain tissue, we investigated neuroinflammation by studying the microglial and astrocyte response in the frontal cortex of 11 aSAH and 10 control patients. In a second study, we investigated the correlation between microthrombosis and microglia by studying the microglial surface area around vessels with and without microthrombosis in the frontal cortex and hippocampus of 8 other aSAH patients. In comparison with controls, we found increased numbers of microglia (mean ± SEM 50 ± 8 vs 20 ± 5 per 0.0026 mm³, p < 0.01), an increased surface area (%) of microglia (mean ± SEM 4.2 ± 0.6 vs 2.2 ± 0.4, p < 0.05), a higher intensity of the astrocytic intermediate filament protein glial fibrillary acidic protein (GFAP) (mean ± SEM 184 ± 28 vs 92 ± 23 arbitrary units, p < 0.05), and an increased GFAP surface area (%) (mean ± SEM 21.2 ± 2.6 vs 10.7 ± 2.1, p < 0.01) in aSAH tissue. Microglia surface area was approximately 40% larger around vessels with microthrombosis than those without microthrombosis (estimated marginal means [95% CI]; 6.1 [5.4-6.9] vs 4.3 [3.6-5.0], p < 0.001). Our results show that the microglial and astrocyte surface areas increased after aSAH and that microthrombosis and microglia are interrelated.

The Association Between Relative Deprivation, Depression, and Youth Suicide: Evidence From a Psychological Autopsy Study.

Suicide is a serious public health concern in China. In the present study, we investigated the specific mechanisms underlying relative deprivation and suicide in rural China. A large psychological autopsy study was conducted in rural China, in which 392 suicides and 416 community-living controls were consecutively recruited. Multiple logistic regression analysis was used to assess the relationship between relative deprivation and suicide, with depression as a potential mediator. Young people who experienced relative deprivation were at a greater risk of suicide and depression. Depression plays a mediating role in the relationship between relative deprivation and suicide. Due to the limitations of the data, we cannot know whether there is mutual causation between relative deprivation and depression. The self-reported relative deprivation may also produce some influence on the results. The current findings demonstrate the importance of relative deprivation as one of the four sources of psychological strain to explain how relative status is associated with suicide. The findings also can be translated into the clinical and preventive practice for suicide.

How do mechanical circulatory support patients die? Autopsy findings for left-ventricular assist device/total artificial heart nonsurvivors

Although life saving for end-stage heart failure patients, permanent mechanical circulatory support (MCS) is often the proximate cause of death in those that do not survive to transplant. Autopsy remains the gold standard for diagnosing causes of death and a vital tool for better understanding underlying pathology of nonsurvivors. The aim of this study was to determine the frequency and outcomes of autopsy investigations and compare these with premortem clinical assessment. The autopsy findings and medical records of all patients who underwent left ventricular assist device (LVAD) or total artificial heart (TAH) insertion between June 1994 and April 2022 as a bridge to transplant, but subsequently died pre-heart transplantation were reviewed. A total of 203 patients had a LVAD or TAH implanted during the study period. Seventy-eight patients (M=59, F=19) died prior to transplantation (age 55 [14] years, INTERMACS=2). Autopsies were conducted in 26 of 78 patients (33%). Three were limited studies. The leading contributor to cause of death was respiratory (14/26), either nosocomial infection or associated with multiorgan failure. Intracranial hemorrhage was the second most common cause of death (8/26). There was a major discrepancy rate of 17% and a minor discrepancy rate of 43%. Autopsy study added a total of 14 additional contributors of death beyond clinical assessment alone (Graphical Abstract). Over an observational period of 26years, the frequency of autopsy was low. To improve LVAD/TAH patient survival to transplant, better understanding as to cause of death is required. Patients with MCS have complex physiology and are at high risk of infection and bleeding complications.

A retrospective analysis of cardiovascular deaths: A 5-year autopsy study of 1045 cases in Antalya, Turkey.

This study aims to identify the macroscopic and microscopic changes that occur in the heart in different causes of cardiovascular death and sudden cardiac death in autopsy cases and evaluate the difficulties that a forensic practitioner may encounter during autopsies. All forensic autopsy cases in the Morgue Department of the Council of Forensic Medicine, Antalya Group Administration between January 1, 2015, and December 31, 2019, were examined, retrospectively. The cases were chosen according to inclusion and exclusion criteria, and their autopsy reports were examined in detail. It was determined that 1045 cases met the study criteria, 735 of which were also met the sudden cardiac death criteria. The top three common causes of death were ischemic heart disease (n = 719, 68.8%), left ventricular hypertrophy (n = 105, 10%), and aortic dissection (n = 58, 5.5%). The frequency of myocardial interstitial fibrosis was significantly higher in deaths due to left ventricular hypertrophy than in deaths due to ischemic heart disease and other causes (χ2 (2) = 33.365, p < 0.001). Despite detailed autopsy and histopathological examinations, some heart diseases that cause sudden death may still not be detected.

Spectrum of histopathological lesions of heart: An autopsy study at tertiary care center

Abstract Background: There has been a notable rise in cardiac-related fatalities globally, especially in the last five decades. In India, ischemic heart disease has become prevalent, affecting roughly 10% of the population. For forensic specialists, establishing the cause of death in individuals previously in good health can be complex. Autopsies are crucial in evaluating the underlying factors responsible for such deaths. This research seeks to identify and scrutinize a wide range of histopathological heart abnormalities that significantly influence the determination of the cause of death. Materials and Methods: This study was conducted in the Department of Pathology from January 2020 to December 2020. During this period, we received a total of 209 whole heart specimens. Of these, 208 specimens underwent comprehensive examinations, including macroscopic and microscopic observations. Results: Out of the 208 cases examined, 94 showed evidence of both early and advanced atherosclerosis, whereas 65 showed early and late signs of myocardial infarction. Myocardial hypertrophy was evident in 29 patients. Isolated instances of myocarditis and pericarditis were observed in one case each. Fatty streaks were identified in 32 cases; three showed red blood cells with sickle cell morphology. Heart rupture was detected in one case, and another revealed metastasis from a poorly differentiated tumor. Notably, in 90 cases, the cause of death remained undetermined despite thorough macroscopic and microscopic autopsies. Conclusion: The primary reason for cardiovascular fatalities is atherosclerosis-related myocardial infarction.

Obesity Cardiomyopathy in Sudden Cardiac Death: A Distinct Entity? A Comparative Study

BackgroundObesity cardiomyopathy (OCM) can be associated with sudden cardiac death (SCD) but its pathologic features are not well described. ObjectivesThe objective of this study was to characterize the clinical and pathological features of OCM associated with SCD. MethodsThis was a retrospective case control autopsy study. OCM was identified by an increased heart weight (>550 g in males; >450 g in females) in individuals with obesity (body mass index [BMI] ≥30 kg/m2) in the absence of other causes. Cases of OCM with SCD were compared to sex and age matched SCD controls with obesity or with normal weight (BMI 18.5-24.9 kg/m2) and morphologically normal hearts. Autopsy measures included: heart weight, atrial dimensions, ventricular wall thickness, and epicardial adipose tissue. Fibrosis was assessed microscopically. ResultsOf 6,457 SCD cases, 53 cases of OCM were identified and matched to 106 controls with obesity and 106 normal weight controls. The OCM mean age at death of individuals with OCM was 42 ± 12 with a male predominance (n = 34, 64%). Males died younger than females (40 ± 13 vs 45 ± 10, P = 0.036). BMI was increased in OCM cases compared to controls with obesity (42 ± 8 vs 35 ± 5). The average heart weight was 598 ± 93 g in OCM. There were increases in right and left ventricular wall thickness (all P < 0.05) in OCM cases compared to controls. Right ventricular epicardial fat was increased in OCM compared to normal weight controls only. Left ventricular fibrosis was identified in 7 (13%) cases. ConclusionsOCM may be a specific pathological entity associated with SCD. It is most commonly seen in young males with increased BMI.

SARS-CoV-2-associated fatalities within the first year of the COVID-19 pandemic: an autopsy study

Abstract Background COVID-19 now exists for more than 3 years and has caused almost 7 million deaths worldwide. At the beginning of this study only little was known on the patients’ characteristics and comparative autopsy studies are still rare. Material and methods Between 11 March 2020 and 10 March 2021, 55 consecutive and complete autopsies of individuals who died in association with SARS-CoV‑2 infections were performed shortly after death (median PMI 6.8 h) by the same team. Clinical data were available in 45 of 55 cases. 1st vs. 2nd infection wave cases and male vs. female cases were compared. Results Thirty-five patients were male (63.6%) 20 were female (36.4%), average age 72.4 years. Seventeen cases (30.9%) could be assigned to the 1st and 38 cases (69.1%) to the 2nd infection wave. Forty-two of the decedents (76.4%) died due to COVID-19. Arterial hypertension, obesity, and cardiac hypertrophy were the most frequent detected comorbidities. Discussion The present study corroborates previous research data but also reveals new approaches for further comparative studies. Patient-specific personal and general ICU-related risk factors for the development of thromboembolisms oppose the effects of changes in anticoagulant medication.

Increased Epicardial Adipose Tissue and Heart Characteristics Are Correlated with BMI and Predict Silent Myocardial Infarction in Sudden Cardiac Death Subjects: An Autopsy Study.

Sudden cardiac death (SCD) is a significant global public health issue and the leading cause of death worldwide. Its etiopathogenesis is complex and multilayered, involving dynamic factors interacting with a preexistent cardiovascular pathology, frequently unknown, and resulting in cardiac rhythm disorders and cardiac arrest; Methods: This study conducted a retrospective descriptive analysis over a one-year period, identifying 321 autopsy cases of sudden deaths from the Institute of Legal Medicine in Mures County, Romania, in 2019. From the 321 sudden death cases, 189 autopsy reports were selected for analysis based on inclusion and exclusion; Results: The autopsies had a mean age of 61.16 years and included 140 males and 49 females. No significant differences were found between the silent myocardial infarction (SMI) and no-SMI groups regarding demographic data. The SMI group exhibited higher thickness of LV (left ventricle), IV (interventricular septum), EAT LCx (epicardial adipose tissue at left circumflex artery), EAT LAD (epicardial adipose tissue at left anterior descending artery), heart weight, and BMI (body mass index). The left coronary artery showed a higher incidence of type V plaques, while the right coronary artery showed higher incidences of type V and type VI plaque. The SMI group also exhibited a higher incidence of moderate and severe valvular atherosclerosis, severe left ventricle dilatation, and a lower incidence of mild left ventricle dilatation. In addition, the SMI group showed a higher presence of contraction band necrosis on histological examination. Multivariate analysis revealed that type V and type VI plaques for the right and left coronary arteries, moderate and severe valvular atherosclerosis, severe left ventricle dilatation, heart weight, EAT LCx, EAT LAD, LV thickness, IV thickness, BMI, and the presence of contraction band necrosis are all independent predictors of SMI; Conclusions: The findings suggest that SCD is a complex condition, and its etiopathogenesis involves dynamic factors interacting with pre-existing cardiovascular pathology. The risk factors of SCD are similar to those of ischemic heart disease. The findings of this study could guide clinicians in identifying patients at risk of SCD and implementing preventive measures.