Bleeding And Fluids Flashcards

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1
Q

What are the fluid compartments

A

Intracellular

Extracellular comprised of plasma (intravascular) and interstitial

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2
Q

Which hormones retain and offload fluid

A

Fluid retention: ADH, aldosterone, oestrogen, glucocorticoids
Offload: ANP

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3
Q

Compare the carotid sinus and carotid body

A

Carotid sinus is located at the base of the internal carotid just above the bifurcation and consists of baroreceptors
Carotid body is located at the bifurcation of the common carotid and is a small cluster of chemoreceptor cells

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4
Q

Describe the Bezold-Jarisch reflex

A

Post MI or reduced preload leads to a sympathetic response causing hypercontractility. Hypercontractility is detected by LV pressure receptors and afferent vagal nerves stimulate the cortex to initiate a parasympathetic response. This leads to bradycardia, hypotension and slow shallow breathing

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5
Q

What does saline do to your pH and strong ion difference

A

Causes a normal anion gap metabolic acidosis (Cl rises higher relative to Na)
Decreased strong ion difference

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6
Q

Why do we give calcium in fluid resuscitation

A

Citrate in bags of blood binds to free calcium

Calcium is a cofactor for a lot of clotting factors

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7
Q

Compare crystalloids and colloids

A

Crystalloids - small particles which can cross the cell membrane so over time get eliminated from the intravascular compartment
Colloids - large particles which cannot cross the cell membrane so stay in the intravascular compartment for longer exerting oncotic pressure

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8
Q

What fluids would you give in neurosurgical rescue

A

Saline 3% or Mannitol which both have high osmotic/oncotic pressure so draw fluid from interstitial space to intravascular compartment

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9
Q

What fluid would you give in burns and distributive shock

A

Hartmans

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10
Q

Define shock

A

Reduced perfusion of end organs leading to inadequate oxygen delivery for their metabolic requirements

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11
Q

What are the 4 types of shock and examples of each

A

Hypovolaemic - burns, bleeding
Distributive - sepsis, anaphylaxis, neurogenic
Obstructive - Tension pneumothorax, PE
Cardiogenic - arhythmias, myocardial contusions, metabolic disturbance

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12
Q

What is anaphylaxis

A

IgE mediated hypersensitivity reaction

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13
Q

How is anaphylaxis managed

A
Remove the trigger
Oxygen
Adrenaline 500micrograms IM (0.5ml)
Fluid challenge 500ml bolus
Chlorphenamine 10mg
Hydrocortisone 200mg
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14
Q

What drug is given for a severe bradycardia

A

Atropine

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15
Q

What initiates trauma induced coagulopathy

A

The trauma itself of traumatic shock leading to tissue hypoperfusion
This leads to acute traumatic coagulopathy which is then worsened by resuscitation associated coagulopathy

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16
Q

What factors contribute to acute traumatic coagulopathy

A

Hyperfibrinolysis
Hypocoagulable state
(Thought to be due to protein C activation which inhibits thrombosis)

17
Q

What is DIC

A

Consumption coagulopathy - coagulation is impaired due to the lack of coagulation factors and platelets

18
Q

What factors contribute to resuscitation associated coagulopathy

A

Acidosis
Hypothermia
Dilution
Consumption of coagulation factors

19
Q

How is coagulopathy managed

A

Correct acidosis
Rewarm
Aggressive crystalloid resuscitation

20
Q

Compare bleeding from penetrating trauma to blunt trauma causing significant injury load in terms of vital signs

A

Penetrating - initial tachycardia then bradycardia an hypotension
Blunt - tachycardia with marked peripheral vasoconstriction

21
Q

Why are you tachypnoeic following shock

A

Reduced blood flow through peripheral chemoreceptors in carotid and aortic bodies leads to stagnant hypoxia so respiratory drive is increased

22
Q

What is the result of reduced stretch on the baroreceptors found in the aortic arch and carotid sinus

A

Reduced vagal activity an increased sympathetic activity on the heart + peripheral vasoconstriction + fluid movement from extra to intravascular

23
Q

Where are cardiac vagal c fibres located, when are they activated and what is their role

A

Located in LV myocardium
Activated when ventricle is underfilled and preload is reduced
Vagal response leads to profound bradycardia and reduced peripheral resistance so hypotension in order to protect the heart (reduced activity = reduced perfusion requirements)

24
Q

How is shock index calculated and what score is associated with higher mortality

A

HR/BP

>1 indicates higher mortality

25
Q

What are the NICE guidelines for fluid resuscitation following trauma

A

250ml crystalloid bolus only if no radial pulse (or central if penetrating torso injury)

26
Q

Who receives damage control resuscitation

A
Major haemorrhage (>4 units of blood needed in 2-4hrs)
Shock (raised lactate, low mixed venous oxygen sats, eFAST)
27
Q

What is permissive hypotension

A

Penetrating trauma keep the systolic BP 70-80

Blunt trauma or TBI patients keep the systolic BP 90

28
Q

What can increasing blood pressure with fluid therapy lead to

A

Dilution of clotting factors and Hb
Disruption of any formed clots due to increased hydrostatic pressure
Lower temperature

29
Q

What do we give for haemostatic transfusion (DCR)

A

1 unit of FFP to every 1-2 units packed red cells
TXA (IV within 3 hours)
Fibrinogen in the form of cryoprecipitate

30
Q

When is interventional radiology used

A

Active arterial pelvic haemorrhage

31
Q

Which cranial nerve innervates the baroreceptors in the aortic arch

A

Vagus