188宝金博页面版

Z Rechtsmed (1990) 103 : 435-452 Zeitschrift f[~r Rechtsmedizin ?9 Springer-Verlag 1990 Zum postmortalen Verhaiten der Rheobase B. Madea und C. HenBge Institut for Rechtsmedizin, Universit~t zu K61n, Melatengttrtel 60-62, D-5000 K61n 30, Bundesrepublik Deutschland Eingegangen 1. November 1989 Postmortem rise of muscular threshold Summary. Own investigations on the postmortem rise of muscular threshold were conducted on 20 bodies with exactly known time of death. Muscular contraction was objectified using a sensitive force transducer. The muscle was excitated using rectangular impulses of i second duration of a current in- tensity which produces a force of muscular contraction of 2.5 mN. These ex- citations were continued over the postmortem interval until a current inten- sity of 80 mN doesn't cause a contraction of 2.5 mN any more. Investigations were mainly performed at the thenar muscles. There is a linear relationship between In of muscular threshold (current intensity) and the time since death (r = 0.965). For any case the linear regression line between In of muscular threshold and time since death was calculated. With mean values for slope and intercept the time of death was calculated for each measured threshold. Extrapolation of the time since death with mean values also for the slope reveals a much more precise estimation of the time since death than an extra- polation with an individual slope as proposed by Joachim and Feldmann (1980). The method was proved on a random sample of 8 practical cases. The real time since death was always within the 95%-limits of confidence of the extrapolated time since death. Key words:Time since death -Muscular threshold -Electrical excitability of skeletal muscle Zusammenfassung. An einem Kollektiv von 20 Leichen wurde die Schwel- lenstromst~rke (Rheobase) bestimmt, welche zu einer Kontraktionskraft yon 2,5 mN ffihrt. Die Messung der Kontraktionskraft erfolgte mit in die Musku-. latur (vorwiegend Thenar) eingestochenem Kraftaufnehmer. Es ergab sich ein weitgehend linearer Zusammenhang zwischen In der Schwellenstrom- st~irke und der Todeszeit. Bei Verwendung des kollektiven Mittelwertes yon Regressionskoeffizient und Intercept k6nnen am vorliegenden Material nach einmaliger Bestimmung der Rheobase Todeszeiten h6herer Pr~zision zu- Sonderdruckanfragen an: B.Madea