Bodies from Fire and Asphyxia Flashcards Preview

Forensic Medicine > Bodies from Fire and Asphyxia > Flashcards

Flashcards in Bodies from Fire and Asphyxia Deck (59)
Loading flashcards...
1

What is the incipient phase of fire dynamics?

Fuel supply heated and ready to burn

2

What happens in the emergent smouldering phase of fire dynamics?

Inefficient combustion-smoke

3

What happens in growth flaming phase of fire dynamics?

Efficient burning
Intensity doubles for each 10 degrees rise in temperature

4

What happens in the oxygen regulated smouldering phase of fire dynamics?

Free burning depletes available oxygen
Glowing combustion
Superheated gases and smoke

5

What are the 4 phases of fire dynamics?

1. Incipient
2. Emergent smouldering
3. Growth flaming
4. Oxygen-related smouldering

6

What is the term for when a fire produces radiant heat and hot gases which brings nearby combustible objects to ignition temperature, then to ignite?

Flashover

7

`What temperatures can flashovers produce?

500-600

8

What is the term for if the fires oxygen supply is depleted, flames die out, residual heat, gases and smouldering remains so reintroduction of oxygen to fire causes explosive ignition?

Backdraft

9

Name three primary identifiers for victims in fire?

Fingerprinty comparison
Dental comparison
DNA- need comparison sample

10

Name three secondary identigiers for victims of fire?

Medical records
Radiological records
Medical devices and implants

11

Name some tertiary identifiers for victims of fire?

Circumstances, personal items, blood group and type

12

If victim was alive during fire what might be found on autopsy?

Soot creases around eyes
Soot around nostrils, mouth, airways
tehrmal injury to laryngeak mucosa
congestion of lungs

(CO and cyanide levels)

13

What czuses laryngeal injury?

Dry air bigger than 150 degrees. More common with steam inhalation (x4000 heat capacity of dry air)

14

What causes cardiac arrest with thermal airway injury?

Reflex vagal inhibition

15

What can cause tracheobronchial necrosis?

Thermal airway injury

16

What are normal levels of CO?

less than 1ppm- present in smokers and city dwellers

17

If CO bigger than 50% whast happens?

Fatalities- can be low as 30 in severe natural disease/children/elderly

18

What colour is carboxyhaemoglobin lividity?

Cherry red

19

Where will a 1-3 nm superheated soot particle reach?

Alveoli. Seen on histology.

20

What does cellulose, polyurethanes and acrylonitrile release?

Nitrogen dioxide

21

What does PVC release?

Hydrogen chloride

22

What does burning wool, silk, nylons and polyurethanes release?

Hydrogen cyanide

23

What does burning wool, cotton, paper, plasters, wood, nylon and polyester resin release?

Aldehydes

24

What does burning petrol, plastics and polystyrene release?

Benzene

25

What does burning melamine and nylon release?

Ammonia

26

Give an example of a radiany burn?

Sunburn- no direct contact

27

Describe a flash burn?

Uniform burning of exposed areas

28

What type of burn causes damage in less thsan one second for temperatures above 70?

Contact burn

29

What causes a scald?

Hot liquid or vapour

30

Wht degree of burns are superficial?

First - heals without scarring