Vocabulary Flashcards
Atrial kick - what is it and what does it look like on ekg?
Caused by atrial depolarization and manifests on the ekg as a P wave.
Diastole - definition and stages
Ventricles fill and relax. Stages are
Rapid filling phase,
Diastasis
Atrial kick
Systole - definition and stages?
Ventricles contract and eject their blood. Stages: Isovolumetric contraction Ventricular ejection Protodiastole Isovolumetric relaxation
P wave
Atrial depolarization
Normal P waves are:
Small, rounded, and upright.
T wave
Atrial repolarization, normally not seen as it happens during QRS complex
QRS complex
Ventricular repolarization
A normal qrs complex
Is spiked in appearance, consisting of one or more deflections from the baseline. It’s shape can vary.
T Wave
Represents ventricular repolarization.
A normal T wave is:
Broad and round
If there is a QRS complex, then:
There must be a T wave after it.
U wave
Represents late depolarization, not normally seem, shallow and round deflects the same way as the T wave.
Each P-QRS-T is
One heartbeat
Each small block on the EKG paper measures
0.04 seconds
Five small EKG blocks together are
One big block, 0.2 seconds
25 small blocks on EKG paper are
1 second of time
300 big blocks are
1 minute of time
PR interval
0.12 to 0.20 seconds (includes p wave and pr segment)
QRS interval
Less than 0.12, usually between 0.06 and 0.10seconds
Measured from the beginning of the QRS to the end of the QRS
QT interval is measured from
The beginning of the QRS to the end of the T wave.
The determine if a QT is prolonged,
Draw a line midway between the QRS complexes. If the T wave ends AFTER this line it’s prolonged.
Memory method of estimating heart rate
300-150-100-75-60-50-43-37-33-30
Little block method of estimating heart rate
1500/#littleblocks
