lecture 11 rhythm of the heart Flashcards
where does the electrical system start
SAN
what is the SAN influenced by
sympathetic and parasympathetic
after SAN
AVN
what happens at the AVN
electrical impulses paused
after AVN
purkinje
where do you see slow AVN conduction on ECG
P-R
bradycardia
less than 60bpm
tachycardia
more than 100 bpm
parasympathetic affact
slows
sympathetic effect
speeds up
very fit people heart rate
high vagal tone
active parasympathetic
low heart rate
brady cardia, normal QRS distance and P wave
sinus bradycardia
no P wave normal QRS distance bradycardia
heart block
bradycardia, normal QRS, normal P wave, long PR
first degree heart blcok
why might you have first degree heart block
old
beta blockers
non regular QRS, bradycardia, P waves
second degree heart block
more P waves than QRS bradycardia
2:1 heart block
no relationship between QRS and P wave
complete heart block
what happens in complete heart block to the ventricles
contract at their own intrinsic rhythm
why might someone have bradycardia
hypothyroid
young
drugs
someone who is unwell with bradycardia treatment
atropine
what does atropine do
speeds the AVN
BBB usually benign
right BBB
LBBB is a problem with
left vetricle
regular narrow QRS tachycardia
SVT
regular QRS tachycardia
VT
how do you distiguish between SVT and VT
inject ademnosine (blocks AVN)
ventricular fibrillation patient
unconscious
no pulse
why does AVN not always conduct SAN
usually in refractory
Torsades de pointes caused by
class 1 antiarrhythmics
treatment of Torsades de pointes
inject magnesium
what could you try and treat SVT
vagotonic manouvres
vagotonic manouvres
cold water
blowing through small tube
pressing on the carotid to stimulate the AVN
treatment for VT
amioderone IV
cardioversion
atrial fibrilation and stroke
bad flow in the atria
leeds to clots
treatment for AF
beta blockers
warfarin
atrial flutter treatment
beta blockers
warfarin
