Lecture 11: Electrocardiogram Flashcards
what occurs during P wave
depolarization of both atria
what occurs during the QRS complex?
depolarization of both ventricles
what occurs during the T wave
re-polarization of ventricles
where is the wave that corresponds to atrial repolarization found
QRS complex, it is just hidden
can you see the depolarization of SA node and AV node cells on an ECG wave?
no
interval that represents the time for atrial depolarization and delay through AV node
P-R interval
isoelectric period b/w the end of the P wave and the beginning of the QRS complex
-period b/w atrial and ventricular depolarization
P-R segment
segment used as a baseline to evaluate the ECG for QRS complex or S-T segment displacement
P-R segment
interval that is measured from the onset of the QRS complex to the end of the T wave
-approximates the time for a ventricular AP
Q-T interval
interval that can be used to determine atrial rate
- measures the time b/w consecutive atrial depolarizations
P-P interval
can be used to determine ventricular rate
-time b/w consecutive ventricular depolarizations
R-R interval
what interval is this
R-R
what interval is this
P-P
ECG characteristic of atrial fibrillation
absence of P waves
ECG characteristic of ventricular fibrillation
weird waveforms, unidentifiable QRS
characteristics of 1st degree AV block
- prolonged P-R interval (>200ms) caused by slowed conduction through AV node or Bundle of His
-one P wave for every QRS
characteristics of 2nd degree AV block
-not every P wave is followed by a QRS complex
- partial dissociation of atria and ventricles
characteristics of 3rd degree AV block (complete heart block)
- P and QRS are independent of each other
- complete dissocaiated of atria and ventricles
- no conduction through AV valve
