Topic 6: Bite Forensics Flashcards
(42 cards)
Hit and run (_%) of attacks and in ___ waters. Speculate many involved are ___ sharks.
80%
shallow
juvenile
Sneak attacks come out of ____ and are usually in ___ water.
- the blue
- deep
Bump and bite is when sharks??
- bump the victim first (assessing potential meal?Exploratory?Threat?); deeper water as well!! Intentional feeding..
Why is it safe to assume that not all shark attacks are feeding behaviour?
- if they were…there would not be as many of survivors!
Explain non-aggressive and aggressive behaviour indicators in sharks. (mostly documented with a blacktip reef shark)
- Aggressive behaviour: very over exaggerated movement…arched body.. tail is way out…very bizarre types of behaviour instead of swimming horizontally… pectoral fins going straight down! (launch attack indicator?) Moving head side to side!
- Non-aggressive behaviour: pectoral fins are roughly horizontal…tips of tail moving are to exaggerated
Pathology of Shark Attack:
- Traumatic effects are dependent on ___ and ___.
-species and size
Pathology of Shark Attack:
- Lower teeth ____ while upper jaw is ??
- fix prey
- protruded and head shaking or rolling(to remove chunks)
Pathology of Shark Attack:
-Hit and run usually involves injuries where?
- extremities
- 70% lower limb only (surfers etc)
- upper injured trying to fend off attacker
- slashing by shark results in linear lacerations
Pathology of Shark Attack:
- Usually if people die its because of??
- the sheer trauma or because people on site do not know what they are doing in terms of medical care…Dangerous place: lower limbs…venus flows…other spurts
Pathology of Shark Attack:
- Durban classification of prognosis following shark attack, according to wound type.
L> Grade of injury, description and outcome?
I. Both femoral arteries; or one femoral artery and one posterior tibial; or one femoral artery in upper 1/3…..outcome: often fatal
II. One femoral artery in lower 2/3; one brachial artery; two posterior tibias; abdominal wounds with bowel involvement(major)…..outcome: should survive, with appropriate pre hospital treatment
III. One posterior tibial; superficial limb wounds; no vessels cut; superficial abdominal wounds; with no peritoneal involvement; both forearm vessels….outcome: Always survive with appropriate pre-hospital treatment!
Pathology of Shark Attack:
-Bumping can cause serious ______, can form long______.
- abrasions (in a larger shark and if its coming at a high speed…due to the dermal denticles on the sharks body)
- deep grooves in skin and underlying tissue
Pathology of Shark Attack:
-Wounds depend on degree of?
- dental serration
- finer tooth: sharp wound edges
L> nice smooth crescent shaped bite marks (GW and tiger)..shake head! - coarse or minimal dental serration: deeper puncture and ragged edges!
L> not a nice clean cut! ..bigger gaps in serrations on teeth= more jagged wounds….
-longer more dagger shaped teeth bite down much deeper vs serrated ones because they do not have to bite as deep…they can just take off a huge chunk cleanly. - long and jagged= mako…. not a nice clean cut!
Pathology of Shark Attack:
- Many shark bites become??
- infected
Pathology of Shark Attack:
-Many shark bites become infected. Many ___ bacteria!
L> what is the main one in sharks?
- atypical
- Halophilic: can cause rapid cellultitis (skin infection or myositis (inflammation of muscles ) within hours. (has a very quick infection rate…some people die days after bc antibiotics do not take effect)
- *sharks mouth is filled with bacteria
Pathology of Shark Attack:
- Many shark bites become infected.Many atypical bacteria. Vibrio spp??
- gram-negative
- causes septicemia (whole body inflammation) now called systemic inflammatory response syndrome (SIRS)
L> basically the whole body is acting towards the infection and the rest of the body is shutting down in the process…people get this from uncooked seafood as well!
Pathology of Shark Attack:
- Treatment
L>main symptoms??
- extreme exhaustion
- severe haemorrhage
- hypothermic (body temp is dropping)
- near-drowned (lungs are probably filled with a lot of salt water
- *loss of a lot of blood!
- *ONLY remove from surf zone..so you are not being pounded by waves while working
Pathology of Shark Attack:
- Treatment
L>priorities are to??
- secure airway
- control haemorrhage
- resuscitation and rewarm (if body temp isn’t kept up…a whole cascade of problems can occur!)
Pathology of Shark Attack: - Treatment L> Direct pressure?? L> Tourniquets? L>Look for signs of?
- on wounds
- they are controversial due to the fact that they completely restrict blood flow but may be necessary! (since blood flow is completely restricted …you could lose a limb)
- signs of shock: dizziness, incoherence, lethargy leading to unconsciousness
Pathology of Shark Attack:
- Treatment
L>when does shock occur?
- after trauma..it is a cascade effect in the body form blood loss and fluid loss…the body tries to compensate for it! Bp drops a lot..body increases heart rate to get more blood flow to the body…dilate which then causes bp to go down further…increase dilation more…bp goes down entirely…body goes into shock!
Pathology of Shark Attack:
- Treatment
L>keep blood flow in___area
L> lift up?
- core
- lower limbs
Pathology of Shark Attack:
- Treatment
L>what can happen when a lower limb is completely taken during an attack?
- the body will constrict the femoral artery completely which can sae an individual…blood flow becomes just a trickle
Video:
- Fatal attacks are very rare/common
- each species of shark creates a similar/unique bite pattern.
- gaps between teeth act as?
- rare
-unique
L> Serrated and close together = tiger
L> big gaps between teeth…upper jaw (GW)
**gap between teeth= indicator of the type of shark that has attacked…from bite forensics…it can give possible suspects but cannot ensure anything!
Great white relaxed ands attack jaw states…explain!
- when relaxed: hyoid arch is relaxed (almost an L shaped bend) when jaws are retracted
- when jaws are protruding (attacking): hyoid arch is in rotated position bracing the jaw (almost a straight shape)
- When palatoquadrate is protruded, skin behind the eye which is attached directly to underlying muscle is pulled tight over postorbital process causing eye hump! (when not biting it goes away)
Imprint of upper teeth; ____ spaced and ___ and ___.
Imprint of lower teeth, punctures are ____ in ____ and ___.
- regularly…broad…flattened
- less regular in spacing and distribution
- *aka….not just the tooth in the imprint…it sunk all the way in..so base as well therefore there is much more space in between teeth than what is seen in an imprint from a shark attack… (identification = harder)