EKG Flashcards
(25 cards)
What is an EKG?
measurement of the electrical conductance of the heart
Are Q and S waves always present?
No
When is the T wave usually positive?
In Lead 2
What is R-R interval?
peak to peak
What are P-R interval and QRS?
baseline to baseline
What happens in a first degree heart block?
prolonged P-R interval, delayed impulse SA through AV node
What is a first degree heart block associated with?
occasionally normal animals, digitalis toxicity, chronic heart disease
How do you treat a 1st degree heart block?
decrease digitalis dose if cause
What is a 2nd degree heart block?
P without QRS
What is a 2nd degree heart block associated with?
digitalis toxicity, increase vagal tone in brachycephalic breeds
How do you TX 2nd degree heart block?
withdraw digitalis, atropine or isoproterenol if symptomatic
What happens in a 3rd degree heart block?
impuse through AV blocked, no relationship between P waves and QRS complexes
What are early signs of trouble?
bradycardia, tachycardia, VPC, 1st or 2nd degree heart block
What is ventricular tachycardia?
4 VPC in a row!
What does a change in the polarity of the T wave mean?
hypoxia!
What is measured with P?
height = right atrium, width = left atrium. opposite for r w. ventricles
How do you calculate HR?
of complexes in 3 seconds x 20
How many hash marks is 3 seconds when doing 25 paper speed?
2
How many hash marks is 3 seconds when doing 25 paper speed?
3
What is 60 cycle interference?
very eve sawtooth line
What does lead 3 do?
widens out the QRS
What does lead 1 cause?
generally small or absent P and T waves
What makes lead 1 hard to use?
shape of animals chest
What recumbency should an animal be in?
right lateral
