Post Mortem Changes Flashcards Preview

Principles of Disease > Post Mortem Changes > Flashcards

Flashcards in Post Mortem Changes Deck (25)
Loading flashcards...
1

When can post mortem changes appear?

Early

Late

2

What are examples of early post mortem changes?

Temperature

Hypostasis

Rigot mortis

3

What are examples of late post mortem changes?

Decomposition and autolysis

Mummification

Adipocere

Skeletonisation

4

What does the human body cooling not obey and why?

Newton's law of cooling as metabolic heat production does not occur uniformly

5

How long does heat production occur after death?

For a variable time

6

What is the rate of cooling proportional to?

The difference in temperature between the body surface and its surroundings

7

What are some factors that affect body cooling?

Initial body temperature

Strenous activity

Body dimensions

Ambient temperature

Clothing and covering

Air movement and humidity

Medium around the body

Posture

Haemorrhage

8

What is hypostasis?

Gravity pulls blood to the lowst accesible area when circulation ceases

9

What does the pattern from hypostasis depend on?

Posture

10

What can sometimes be helpful to identify the cause of death in relation to blood?

The colour of hypostasis

11

What is rigor mortis?

Stiffening and shortening of muscle fibres leading to rigidly of the musculature and fixation of the joints

12

What does rigor mortis happen due to?

Reduction of ATP within the muscles after death

13

What are factors affecting the timing or rigor mortis?

Temperature

Physical activity before death

Body temperature at time of death

Convulsions

Electrocution

14

What are the 2 kinds of decompostion?

Putrefaction (microbiological degradation)

Autolysis (endogenous proteolytic degradation, due to enzymes)

15

What is putrefaction decomposition?

Microbiological degradation

16

What is autolysis degradation?

Endogenous proteolytic degradation due to enzymes

17

What are variables that affect decomposition?

Ambient temperature

Humidity

Cleanliness of the environment the body is lying in

18

What is mummification?

The process of dry decomposition, with desiccation of the body and a relative lack of bacterial involvement

19

What a happens to the body during mummification?

It essentially dries out

20

What is adipocere?

Induced by the alteration of fatty tissues within the body into a greasy/waxy or brittle material which frequently remains attaches to the body skeleton and may retain the body structure to some extent

21

When does adipocere tend to happen?

In damp or wet environments

22

What is skeletonisation?

The condition when all of the soft tissue of the body have completely degraded

23

What is useful to age bones?

Radioisotopes

24

Why can the time of death not be estimated with any any accuracy?

Due to so many variables

25

What are the basic rules of thumb for estimating the time of death?

0-12 hours (body temperature is most useful, 1oC drop per hour)

24 hours (rigor mortis and hypostasis)

48 hours to 3 weeks (putrefaction)

Months to years (adipocere, mummification, skeletonisation)