Emergency and critical care Flashcards
what can increase the success rate of CPR?
being under anaesthesia as will be on 100% oxygen so get a while longer before heart stops
what can increase the success rate of CPR?
being under anaesthesia as will be on 100% oxygen so get a while longer before heart stops
what can increase the success rate of CPR?
being under anaesthesia as will be on 100% oxygen so get a while longer before heart stops
what is a cardiopulmonary arrest?
cessation of effective cardiac activity and respiration
what is return of spontaneous circulation?
ROSC - re-establishment of sustained CO without assitance
what is basic life support?
compressions and assisted ventilation
what is advanced cardiac life support?
basic life support + medical + electrical intervention
what often preceeds a cardiopulmonary arrest?
hypoventilation
bradycardia
what are some ECG changes to look out for?
ventricular tachycardia ventricular flutter 3rd degree AV block atrial standstill ST depression R on T phenomenon
What is a vagal arrest?
very high vagal tone causing life threatening bradycardia
- give oxygen and atropine
- high vagal tone from vomiting, defecation, resp/abd disease, ocular or neck surgery
how do you carry out CPR?
in R lateral recumbency
on an AmbuBag for 100% oxygen and +ve pressure ventilation
what rate of respiration should you do with CPR?
12-15 bpm
when is closed chest CPR suitable
under 7 kg do cardiac pump and over 7kg do thoracic pump
what is the rate of chest compressions?
100 bpm
let thorax spring back completley
when is open chest CPR considered?
- already under anaesthesia
- very large dogs
- pleural space / pericardial disease
- penetrating chest trauma
- haemoabdomen
When would you give adrenaline?
pulseless electrical activity
asystole
when would atropine be given?
sinus bradycardia
when would lidocaine be given?
sinus tachycardia
when is calcium gluconate given?
if have hypocalcaemia and hyperkalaemia
when would you give sodium bicarbonate?
acidic ph
when would you give lidocaine?
ventricular tachycardia
what drugs can be given via an ET tube?
Naloxene Atropine Vasopressin Epinephrine Lidocaine
NAVEL
what is Naloxene?
an opioid antagonist
what is atropine?
muscarinic antagonist
increases HR as anti-para
what is lidocaine?
neuronal Na channel blocker
-antiarrhythmic and local anaesthetic
what % dehdration is needed before a skin tent remains and have dry mm and sunken eyes?
8-10%
what % of dehydration is needed for hypovolaemia signs?
over 12%
What are the signs of hypovolaemia?
tachycardic low pulse pressure low jugular filling tachypnoea cold extremitis low urine output
what are signs of dehydration?
prolonged skin tent
tacky mm
sunken eyes
how do you calculate the fluid defecit?
BW (kg) x %dehydrated (10% = 0.1)
what happens if you give propofol too fast?
tachycardia hypotension apnoea --cardiopulmonary arrest -start CPR and antagonise a2 and turn off any inhalant
what can cause tachycardia during surgery?
pain too light hypovolaemia hypotensive hypoxaemia hypercapnia hyperthermia hypovolaemia
what can indicate the anaesthetic is too light?
tachycardic
tachypnoeic
hypertensive
what can cause reduced SpO2?
- Et tube obstruction
- medetomidine causing vasoconstriction in first 10-15 mins
what are the 4 types of circulatory shock?
hypovolaemic
maldistributive
cardiogenic
obstructive
what is shock?
significant compromise in oxygen delivery to tissues
what are the 3 ways to get shock?
- failure of circulatory system (circulatory shock)
- failure of blood to carry enough oxygen (V/Q mismatch)
- failure of tissues to utilise oxygen effectively (cyanide toxicity)
what are hyperdynamic pulses?
taller as greater difference between diastolic and systolic pressure
what is different about cats in shock?
can get bradycardia as their HR is closely regulated to core temp so if get cold then HR slows down
What is hypovolaemic shock?
tissue hypoperfusion secondary to a lack of circulating blood volume
-fluid lost from intravascular volume
what is the difference between dehydration and hypovolaemia?
-dehydration is fluid loss from all 3 compartments - intracascular, interstitial and intracellular whereas hypovolaemia is reduced intravascular volume
what can cause hypovolaemia?
haemorrhage
fluid loss into GIT
fluid loss into third space
what are some consequences of hypovolaemia?
reduced venous return, mismatch in o2 supply/demand, anaerobic metabolism and lactate build up
what are signs seen in early compensatory hypovolaemic shock?
HR 130-150 MM normal or even pinker - rapid CRT bounding hyperdynamic pulses easily palpable metatarsal pulse lactate 3-5 mmol/L
what are signs seen in late decompensated hypovolaemic shock?
HR 170-220 white / grey MM long or absent CRT weak / thready pulses absent metatarsal pulses lactate over 8 mmol/L maybe low bp
what is the treatment for hypovolaemic shock?
- IV fluid bolus (isotonic crystalloids) 10-40ml/kg in 20 mins then reases
- monitor for dyspnoea
what is dog blood volume?
60-90 ml/kg
what is cat blood volume?
40-60 ml/kg
what is a consideration in fluid therapy in large dogs?
the volume needed isnt possible in short amount of time so could give hypertonic crystalloids
what may colloids be used in hypovolaemia?
they stay in intravascular volume for longer than crystalloids which equally diffuse across all compartments
what catheter will give least resistance to IVFT?
short and wide
What is maldistributive shock?
inappropriate vasodilation leading to alteration in distribution of blood flow between the tissues
what can cause maldistributive shock?
SIRS - systemic inflammatory response syndrome
sepsis
what are the signs of maldistributive shock?
- red injected MM
- very fast CRT
- sepsis
what is SIRS?
systemic inflammation and oedema, multiple organ dysfunction
what is sepsis?
SIRS and documented infection site
what is septic shock?
sepsis and hypotensive
what is septicaemia?
sepsis and bacteraemia
how do you treat maldistributive shock/.
fluids
inotropes/vasopressors to improve BP, perfusion and vascular tone
what is cardiogenic shock?
failure of the heart as a pump
what can cardiogenic shock be secondary to?
cardiomyopathies
valvular disease
arrhytmias
what is seen with cardiogenic shock?
resp signs
very high HR
how do you treat cardiogenic shock?
-diureticcs
-inotropes, anti-arrhytmics, vasodilators
NO fluids
what is obstructive shock?
obstruction to blood flow
what can cause obstructive shock?
pericardial effusion
pulmonary thromboembolism
GDV putting pressure on VC and aorta
what is a cardiopulmonary arrest?
cessation of effective cardiac activity and respiration
what is return of spontaneous circulation?
ROSC - re-establishment of sustained CO without assitance
what is basic life support?
compressions and assisted ventilation
what is advanced cardiac life support?
basic life support + medical + electrical intervention
what often preceeds a cardiopulmonary arrest?
hypoventilation
bradycardia
what are some ECG changes to look out for?
ventricular tachycardia ventricular flutter 3rd degree AV block atrial standstill ST depression R on T phenomenon
What is a vagal arrest?
very high vagal tone causing life threatening bradycardia
- give oxygen and atropine
- high vagal tone from vomiting, defecation, resp/abd disease, ocular or neck surgery
how do you carry out CPR?
in R lateral recumbency
on an AmbuBag for 100% oxygen and +ve pressure ventilation
what rate of respiration should you do with CPR?
12-15 bpm
when is closed chest CPR suitable
under 7 kg do cardiac pump and over 7kg do thoracic pump