Bleeding And Fluids Flashcards
What are the fluid compartments
Intracellular
Extracellular comprised of plasma (intravascular) and interstitial
Which hormones retain and offload fluid
Fluid retention: ADH, aldosterone, oestrogen, glucocorticoids
Offload: ANP
Compare the carotid sinus and carotid body
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
Describe the Bezold-Jarisch reflex
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
What does saline do to your pH and strong ion difference
Causes a normal anion gap metabolic acidosis (Cl rises higher relative to Na)
Decreased strong ion difference
Why do we give calcium in fluid resuscitation
Citrate in bags of blood binds to free calcium
Calcium is a cofactor for a lot of clotting factors
Compare crystalloids and colloids
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
What fluids would you give in neurosurgical rescue
Saline 3% or Mannitol which both have high osmotic/oncotic pressure so draw fluid from interstitial space to intravascular compartment
What fluid would you give in burns and distributive shock
Hartmans
Define shock
Reduced perfusion of end organs leading to inadequate oxygen delivery for their metabolic requirements
What are the 4 types of shock and examples of each
Hypovolaemic - burns, bleeding
Distributive - sepsis, anaphylaxis, neurogenic
Obstructive - Tension pneumothorax, PE
Cardiogenic - arhythmias, myocardial contusions, metabolic disturbance
What is anaphylaxis
IgE mediated hypersensitivity reaction
How is anaphylaxis managed
Remove the trigger Oxygen Adrenaline 500micrograms IM (0.5ml) Fluid challenge 500ml bolus Chlorphenamine 10mg Hydrocortisone 200mg
What drug is given for a severe bradycardia
Atropine
What initiates trauma induced coagulopathy
The trauma itself of traumatic shock leading to tissue hypoperfusion
This leads to acute traumatic coagulopathy which is then worsened by resuscitation associated coagulopathy