死后生物化学在糖尿病酮症酸中毒法医学诊断中的应用

糖尿病酮症酸中毒是糖尿病患者一种处于高糖、高酮状态并且导致代谢失代偿的危险并发症。这类死者常规法医学检查无特异性表现,需要进行死后生物化学指标分析。死后生物化学是一种采集死者体液进行生物化学检测,从而判断死者生前的代谢状态进而明确死因的检查方法。本文综述了糖尿病酮症酸中毒死亡的基本情况、法医学检查表现,并着重阐述运用于诊断糖尿病酮症酸中毒的死后生化指标,从而总结糖尿病酮症酸中毒死亡的法医学诊断思路。     

早期死亡时间推断研究进展

死亡时间推断在判断案件的性质、划定侦查范围及锁定嫌疑人等方面至关重要,一直是法医病理学工作的重点和难点。早期死亡时间,即指死后24 h以内,由于距离案发时间更短,对其准确推断能促进案件的成功侦破,具有重要的法医学意义。近年来,国内外法医学者运用一系列新方法和新技术对早期死亡时间推断进行了大量研究。本文对体液生物化学、超生反应、代谢组学、影像学、遗传物质降解规律等方面的研究进展进行综述,以期为早期死亡时间推断的研究和应用提供新的思路。     

The Estimation of Postmortem Serum Urea via the Ultrafiltration of Hemolyzed Blood

Postmortem serum urea has been demonstrated as an objective indicator for the forensic diagnosis of cause of death. However, samples used in postmortem biochemical analysis are always affected by hemolysis. To investigate whether hemolysis affects the biochemical analysis of urea and to explore the feasibility of using ultrafiltration to process hemolyzed blood samples, three different levels of hemolyzed blood samples were used to assess the influence of hemolysis on postmortem biochemical analysis of urea, and two ultrafiltration methods were used to process the hemolyzed blood samples. Bias% was used to assess the interference of hemolysis. Our results showed that heavy hemolysis had a significant influence on the biochemical analysis of urea. Both ultrafiltration methods in the present study could significantly reduce the interference of hemolysis, with the |bias%| of methods A and B decreasing from 69.74% ± 99.14% to 12.18% ± 7.23% and 10.77% ± 8.09%, respectively, compared to the original serum. After regression correction, there was no significant difference between the urea concentration in the ultrafiltrates of the two ultrafiltration methods and that in the original serum, which suggested that the postmortem serum urea concentration could be estimated by the corrected urea concentration in the ultrafiltrate. The current study also provided possible pretreatment methods for postmortem biochemical analysis of other biomarkers in hemolyzed blood samples of forensic practice.     

尿素氮、肌酐和尿酸死后生化学检测的法医学应用

死后生化学是法医鉴定中重要的检查手段。研究表明含氮化合物中尿素氮、肌酐、尿酸是临床上常用的生化学检测指标,其在法医死后生化学检测中也有重要的价值。本文就体内上述三者的特征及其在法医学中的研究及应用加以综述,以期为法医死后生化学分析提供参考。     

The Role of Vitreous Magnesium Quantification in Estimating the Postmortem Interval

The use of magnesium as a parameter to estimate the time of death is controversial. In 32 traumatic deaths with known postmortem intervals (PMIs), small quantities of vitreous humor (VH) were sampled repetitively every 3 h until 24 h postmortem. The bodies were kept at the constant ambient temperature of 20°C (68°F). The concentrations of magnesium were in the range of 0.47–1.15 mM. A statistically significant correlation of the concentration of magnesium with the PMI was observed (r = 0.453, p < 0.01), but with small predictive value—coefficient of variation for regression was 45.5%; the average of the paired differences between the estimated and actual PMIs was 5.24 + 3.19 h. Although useful results might be expected due to the large transmembrane gradient for magnesium, the results of this study strongly disprove the usefulness of measuring magnesium in VH to estimate the time of death.     

Ketoacidosis and Adrenocortical Insufficiency

We herein report an autopsy case involving a 27‐year‐old Caucasian woman suffering from chronic adrenocortical insufficiency with a background of a polyendocrine disorder. Postmortem biochemistry revealed pathologically decreased aldosterone, cortisol, and dehydroepiandrosterone levels in postmortem serum from femoral blood as well as decreased cortisol and 17‐hydroxycorticosteroid in urine. Decreased vitreous sodium and increased 3‐beta‐hydroxybutyrate and C‐reactive protein concentrations were observed. The cause of death was determined to be acute adrenocortical insufficiency. Fasting ketoacidosis was postulated to have precipitated the Addisonian crisis. Traumatic causes of death and third‐party involvement were excluded. The case highlights the importance of systematically performing exhaustive postmortem biochemical investigations to formulate appropriate hypothesis regarding the pathophysiological mechanisms involved in the death process.     

Early Repolarization,Acute Emotional Stress and Sudden Death

We herein report the case of a 36‐year‐old man who died suddenly after a fight with another man. Forensic investigations included unenhanced computed tomography, postmortem angiography, autopsy, histology, neuropathology, toxicology, and biochemistry and allowed a traumatic cause of death to be excluded. An electrocardiogram recorded some years prior to death revealed the presence of an early repolarization pattern. Based on the results of all investigations, the cause of death was determined to be cardiac arrhythmia and cardiac arrest during an emotionally stressful event associated with physical assault. Direct third party involvement, however, was excluded, and the manner of death was listed as natural. The case was not pursued any further by the public prosecutor.     

Evaluation of postmortem biochemical markers: Completeness of data and assessment of implication in the field

Throughout the years an increase has been observed in research output on biochemical markers for determining the postmortem interval (PMI). However, to date, a complete overview is missing on the results of postmortem biochemical markers (PBM's) for PMI estimation. In this paper, literature was reviewed in order to identify the knowledge lacunae of PBM research from a practical point of view. A three-step approach was undertaken in order to achieve the set goal. Literature was collected, the PBM's were evaluated for completeness by means of a scorings index based on set criteria, and PBM's were subsequently evaluated in light of the Daubert & Frye criteria for scientific evidence in court. Seven PBM's were found to be well investigated, from which potassium had the highest completion score. However, none of these PBM's could be qualified as suitable for court evidence. Further, this study revealed that the majority of PBM's (94%) is not well investigated. Consequently, these PBM's did not meet Daubert & Frye criteria. In order to improve the assessment for use of PBM's as evidence in court regarding PMI estimation, PBM's should be investigated more thoroughly and data should be made readily available.     

疏肝利胆冲剂在肝内外胆管结石术后应用研究

目的观察疏肝利胆冲剂治疗肝内外胆管结石的临床疗效及其作用机制。方法将31例肝内外胆管结石术后患者随机分为研究组和对照组,研究组16例,对照组15例,研究组在常规补液、抗感染治疗基础上,给予疏肝利胆冲剂口服,1包/次,每日3次,疗程7 d;对照组只给予常规补液、抗感染处理。分别观察两组治疗前后临床症状体征、血常规、肝功能、血清胆汁生化指标、T管引流液胆汁生化指标和胆汁引流量变化。结果两组治疗前和治疗后临床症状、体征和血常规改变的差异无显著性(P>0.05);两组治疗后丙氨酸转移酶、天冬氨酸转氨酶、血清前清蛋白水平比较,差异有显著性(P<0.05,或P<0.01)。两组治疗后总胆汁酸(total acid bile,TAB)、总胆红素(total bilirubin,TB)和结合胆红素比较,差异有显著性(P<0.05,或P<0.01)。两组治疗后T管引流液胆汁TAB、TB、非结合胆红素、总胆固醇和钙离子水平比较,差异有显著性(P<0.05,或P<0.01)。两组治疗后平均每日T管胆汁引流量比较,差异有非常显著性(P<0.01)。结论疏肝利胆冲剂通过促进术后肝功能早日恢复、调节致石性胆汁成分、增加胆汁分泌量,达到促...