Action potential pathways through the heart and basic EKG readings Flashcards
SA node conduction speed
.05 m/s
Bachman’s Bundle conduction speed
1m/s
Internodal Fibers conduction speed
1m/s
AV node conduction speed
.05 m/s
bundle of his conduction speed
2 m/s
left and right Bundle Branches conduction speed
2 m/s
Purkinji fibers conduction speed
4 m/s
why is it essential for the conduction speed to start out very slow at the AV node then speed up in the continuous areas?
holding onto the action potential by essentially being slow to conduct it allows the atria to fully depolarize and contract before the ventricles
p wave
depolarization of the atria
qrs complex
depolarization of the ventricles
t wave
repolarization of the ventricles
periods of isoelectricity
no net change in electrical activity
pacemaker areas of the heart
SA node
AV node
Perkinji Fibers
work cardiomyocytes?
SA node bpm
60-100 bpm
AV node bpm
40-60 bpm
Purkinji Fibers bpm
20-40 bpm
work cardiomyocytes bpm
10-20 bpm
1st degree heart block
delay between SA and AV nodes
-not abnormal in young healthy people or a good parasympathetic tone
2nd degree heart block
some beats are dropped at the AV nod
-you should put a pacemaker in
3rd degree heart block
ventricles receive no impulses
-lead to death
p Wave
atrial depolarization
P-R interval
AV Conduction time with atria and ventricular contraction
QRS complex
ventricular depolarization
ST segment
isoelectric line or period of ventricular contraction