Electrophysiology Flashcards
1
Q
What are the intrinsic firing rates of the SA node, the AV node, and the Purkinje fibres in the heart?
A
SA: 60-100 beats/min
AV: 40-60 beats/min
Purkinje: 20-40 beats/min
2
Q
In a normal ECG trace, what heart activity does the P-wave indicate?
A
Atrial contraction (atrial depolarization)
3
Q
In a normal ECG trace, what heart activity does the QRS complex indicate?
A
Ventricular contraction (ventricular depolarization)
4
Q
In a normal ECG trace, what does the T-wave indicate?
A
Ventricular repolarization
5
Q
What heart condition would be indicated if an ECG showed an elevation to the S-T segment?
A
STEMI
6
Q
What are the 6 steps to accurate ECG interpretation?
A
- Rate
- Regularity
- P-waves (Morphology? 1 for each QRS?)
- P-R interval (How long between atrial and ventricular depolarization?)
- QRS complex (Duration? Widened indicates no SA/AV node)
- Overall interpretation
7
Q
What is the name of the electrical conduction pathway that connects the R and L atria?
A
Bachmann’s bundle
