Legal medicine (Tokyo, Japan) · 2026
Postmortem computed tomography lung imaging findings in cases of fatal hypothermia with infusion administered for cardiopulmonary resuscitation.
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Takeuchi Akiko, Jin Shigeki, Kiuchi Takayuki, Uozumi Ryo, Matoba Tomoko, Hara Yuta, Takahashi Keiko, Misaki Chihiro, Kikawa Aya, Eguchi Ayako, Murakami Manabu, Hyodoh Hideki, Matoba Kotaro
Аннотация
OBJECTIVE: The aim of this study was to investigate and evaluate the changes in postmortem lung computed tomography (CT) imaging findings following cardiopulmonary resuscitation (CPR) using infusion in cases of fatal hypothermia.
MATERIALS AND METHODS: Between January 2020 and December 2024, among 65 cases of fatal hypothermia deaths subjected to postmortem CT imaging and forensic autopsy at our institution, 29 cases with a postmortem interval of less than 48 h were selected. 11 subjects who received intravenous resuscitation before death was declared comprised Group I and 18 subjects who did not receive infusion comprised Group II. In the postmortem chest CT scans of these cases, chest cavity excluding the mediastinum (CC) and aerated lung volume (ALV) were measured. Furthermore, the ratio of ALV to CC (%ALV = ALV/CC × 100) was calculated.
RESULTS: The ALV in Groups I and II was 1018 ± 333.4 and 2573 ± 168.0 mL, respectively, with a significant difference between the groups (p = 0.0011). The %ALV was significantly lower in Group I (34.6 % ± 8.88 %) than in Group II (81.3 % ± 1.39 %) (p < 0.0001). A strong negative correlation was observed between infusion volume and %ALV in all cases, with a correlation coefficient of -0.7743 (p < 0.0001).
CONCLUSION: Our findings suggest that, in cases of fatal hypothermia, the %ALV in postmortem lung CT decreases when resuscitation with a large volume of infusion is administered as part of resuscitation after cardiopulmonary arrest.
MATERIALS AND METHODS: Between January 2020 and December 2024, among 65 cases of fatal hypothermia deaths subjected to postmortem CT imaging and forensic autopsy at our institution, 29 cases with a postmortem interval of less than 48 h were selected. 11 subjects who received intravenous resuscitation before death was declared comprised Group I and 18 subjects who did not receive infusion comprised Group II. In the postmortem chest CT scans of these cases, chest cavity excluding the mediastinum (CC) and aerated lung volume (ALV) were measured. Furthermore, the ratio of ALV to CC (%ALV = ALV/CC × 100) was calculated.
RESULTS: The ALV in Groups I and II was 1018 ± 333.4 and 2573 ± 168.0 mL, respectively, with a significant difference between the groups (p = 0.0011). The %ALV was significantly lower in Group I (34.6 % ± 8.88 %) than in Group II (81.3 % ± 1.39 %) (p < 0.0001). A strong negative correlation was observed between infusion volume and %ALV in all cases, with a correlation coefficient of -0.7743 (p < 0.0001).
CONCLUSION: Our findings suggest that, in cases of fatal hypothermia, the %ALV in postmortem lung CT decreases when resuscitation with a large volume of infusion is administered as part of resuscitation after cardiopulmonary arrest.