We developed a simultaneous analysis method for 13 neonicotinoids and related insecticides in whole blood by liquid chromatography-tandem mass spectrometry (LC-MS/MS) using a Novum simplified liquid extraction column. The extraction method, which employs an extraction solvent of 16% acetonitrile in ethyl acetate, demonstrated the best performance in terms of balancing phospholipid removal ability, recovery efficiency and matrix effects. Calibration curves showed good linear relationships, with r2 values exceeding 0.995. The intra- and inter-day accuracies and precisions were 85.5-108.8% and 0.2-13.0%, respectively. The recovery efficiencies were in the range of 52.7-92.7%. Matrix effects were between 60.6 and 201.0%; higher effects were seen for fipronil, which represents a significant challenge that resulted in substantial ion enhancement. Nevertheless, both the accuracy and precision of the method were enhanced by utilization of a stable isotopically-labeled internal standard followed by LC-MS/MS. The method was applied to a human postmortem blood sample collected during a forensic autopsy to demonstrate feasibility; results suggest that this method will be useful for forensic toxicological investigations.
We report a case of a minimally invasive autopsy using postmortem contrast-enhanced computed tomography (PMeCT) by direct large-vessel puncture combined with CT-guided myocardial biopsy as a novel method to determine the cause of death. The case involved a man in his 60 s who was found dead at his residence. Postmortem CT revealed a hematoma around the heart, suggesting the possibility of a post-myocardial infarction cardiac rupture or aortic dissection. PMeCT revealed contrast agent infiltration into the myocardium and leakage into the pericardium, indicating pericardial hematoma, likely due to cardiac rupture. A CT-guided percutaneous biopsy was performed on the area of contrast infiltration, and subacute myocardial infarction was observed 3-7 days after onset. Postmortem CT angiography provides detailed vascular images and is a valuable tool for evaluating pericardial hematomas and cardiac ruptures; however, the cost of the equipment and time constraints have limited its widespread use. To address these challenges, a relatively inexpensive technique called PMeCT by direct large-vessel puncture has been developed. To our knowledge, this is the first practical demonstration of combining PMeCT by direct large-vessel puncture with CT-guided myocardial biopsy in an actual forensic death investigation. This case illustrates how this minimally invasive approach can yield both radiological and histopathological insights, potentially offering a viable alternative in cases where a conventional autopsy is not feasible. As a supplementary report to our previous technical study, this case highlights the real-world applicability and diagnostic value of the technique, especially for identifying cardiac rupture.

