Algor mortis explained

Algor mortis, the third stage of death, is the change in body temperature post mortem, until the ambient temperature is matched. This is generally a steady decline, although if the ambient temperature is above the body temperature (such as in a hot desert), the change in temperature will be positive, as the (relatively) cooler body equalizes with the warmer environment. External factors can have a significant influence.

The term was first used by Bennet Dowler in 1849.[1] The first published measurements of the intervals of temperature after death were done by John Davy in 1839.[2] [3]

Applicability

A measured rectal temperature can give some indication of the time of death. Although the heat conduction which leads to body cooling follows an exponential decay curve, it can be approximated as a linear process: 2 °C during the first hour and 1 °C per hour until the body nears ambient temperature.

The Glaister equation[4] [5] estimates the hours elapsed since death as a linear function of the rectal temperature:

(36.9\circC-rectal)

6
5

or
98.4\circ{\rmF
-

rectaltemperatureinFahrenheit

}

Variability

Generally, temperature change is considered an inaccurate means of determining time of death, as the rate of change is affected by several key factors, including:[6]

Further reading

External links

Notes and References

  1. Riess. Karlem. The Rebel Physiologist. Journal of the History of Medicine and Allied Sciences. 24620836.
  2. Book: Davy, John. Researches: Physiological and Anatomical. 228. 1839. Smith, Elder and Company. en.
  3. Book: Madea, Burkhard. Estimation of the Time Since Death, Third Edition. CRC Press. 2015.
  4. http://www.fmap.archives.gla.ac.uk/DC403/DC403_page.htm Forensic Medicine Archives Project
  5. Book: Forensic Medicine. Guharaj, P. V.. Cooling of the body (algor mortis). 2003. 2nd. 61–62. Longman Orient. Hyderabad.
  6. Web site: Changes to a Body after Death . 2013-05-05 . https://web.archive.org/web/20180908062826/http://www.crimewatchcanada.com/index.php?option=com_content&view=article&id=79:changes-to-a-body-after-death&catid=41:january-february-2010-issue-76&Itemid=53 . 2018-09-08 . dead .
  7. Kaliszan. M.. Verification of the exponential model of body temperature decrease after death in pigs. Experimental Physiology. 20 May 2005. 90. 5. 727–738. 10.1113/expphysiol.2005.030551 . 15944204. 22096083.