ECG Basics Flashcards
SA node inherent rate
60-100 bpm
AV Node inherent rate
40-60 bpm
Bundle of HIS inherent rate
40-60 bpm
Left/Right bundle branches inherent rate
20-40 bpm
Purkinje Fibers inherent rate
20-40
Where does Atrial depolarization occur?
P wave
Where does ventricular depolarization occur?
QRS complex
Where does atrial repolarization occur?
QRS Complex
Where does ventricular repolarization occur?
T wave
What is a normal PR interval?
0.12 - 0.20 secs
How many secs in a small box?
0.04 secs
how many secs in a big box?
0.20
How do you calculate HR with the big box method?
You take the amount of big box’s between R intervals and divide it w/300
300/ Boxes within R intervals
QRS complex normal?
0.06 -0. 12 secs
Key identifier for: First degree Heart block
Consistent prolonged PR interval
PRI > 0.20 secs
Key identifier for: Second degree Heart block TYPE 1
“Wenckebach” = Progressive block
Progressivly longer PR Interval -> than QRS drop
long long drop
Key identifier for: Second degree Heart block TYPE 2
“Mobitz II” = Intermittent Block
Drops in QRS complex
normal normal drop
Key identifier for: Third degree Heart block TYPE 2
Complete heart block
No correlation between P waves and QRS complexes
