1
Q
QRS axis
A
-30 to +100
Lead I negative: RAD
Lead II negative: LAD
2
Q
PR interval
A
120-200 ms
3
Q
QRS interval
A
<100 ms
4
Q
QT interval
A
Quick: less than 1/2 of R-R
Corrected: QTc= QT/sqrt(RR)
5
Q
short PR interval?
A
<120
Bypass tract connecting atria to ventricles (WPW)
6
Q
prolonged QRS?
A
> 120
BBB
7
Q
prolonged QT?
A
long repolarization phase –> risk for lethal arrythmia
8
Q
criteria for LVH?
A
(1) R wave in aVL > 11mm
(2) S wave in V1 + R wave V5/6 >35 mm
ST-T waves: ST depression, T wave inversion
9
Q
normal heart rate
A
60-100 bpm
10
Q
inverted T wave?
A
recent bout of myocardial ischemia, or NSTEMI
