Recalls Flashcards
3 small squares
100 bpm
Picture
71-80 bpm
PR segment
AV
II, III, AVF
Inferior
V1-V4
Anteroseptal
V1
4th intercostal right
V4
5th intercostal midclav
One small box
0.04 sec
P wave
Atrial depolarization
QRS
Ventricular depolarization
T
ventricular repolarization
Describe sinus rhythm
P precedes QRS
One large box (Horizontally)
0.20 secs
One large box (Vertically)
0.5 mv
aVlL, I and II
Lateral
aVR
Right side of the heart
Method 1
The Quadrant Method
The most efficient way to estimate axis is to look at ________ and _________.
Lead I and lead aVF
The quadrant method
Lead I and aVF
Three lead analysis
Lead I, Lead II and aVF
Lead 1: Positive
Lead aVF: Positive
Normal Axis (0 - +90)
Lead 1: Positive
Lead aVF: negative
Possible LAD (0 to -90)
Lead 1: negative
Lead aVF: Positive
RAD (+90 - 180)
Lead 1: Negative
Lead aVF: Negative
Extreme axis
The usual paper speed is:
25mm/sec
QRS axis between -30 and +90
Normal axis
QRS axis less than -30
Left axis deviation
QRS axis greater than +90
Right axis deviation
QRS axis between -90 and 180 (aka “Northwest axis”)
Extreme axis deviation
Refers to the spontaneous time-dependent depolarization of the cell membrane that leads to an action potential in an otherwise quiescent cell.
Pacemaker activity
Any __________ with pacemaker activity can initiate the heartbeat.
Cardiac cell
The pacemaker with the ___________________ will be the one to trigger an action potential that will propagate throughout the heart.
Highest frequency
6 i all I, II, III, aVL, aVR, aVF
Limb leads
6 in all V1, V2, V3, V4, V5, V6
Chest leads
1st downward wave of the complex
Q wave
1st upward wave of the complex
r wave
Downward wave preceded by an upward wave
S wave
Qtc duration men
<0.45 s
QTc duration women
<0.46 s
Normal QT interval
0.42 secs
Normally QRS duration
0.08 - 0.10 s
Narrow complexes
QRS <100 ms
Broad complexes
QRS >100 ms
Narrow complexes are __________ in origin.
Supraventicular
Broad complexes may be either ventricular origin or due to ____________ of supraventicular.
Aberrant conduction
Normal PR interval
0.12 to 0.20 s (3-5 small squares)
Interventricular septum
V1, V2
Lateral wall
I, aVL, aVR
Anterolateral wall
V5, V6
Anterior wall
V3, V4
Inferior wall
II, III, aVF
SA node intrinsic firing rate
70-80
AV node intrinsic firing rate
40-60
Purkinje fibers
15-20
P wave must be positive in _______
Lead II (II, III, aVF)
P wave duration
<0.125 s
P wave amplitude
< or = to 2.5 mm (all leads)
4th intercostal space at the right sternal border
V1
4th intercostal space at the left sternal border
V2
On the left on the 5th rib between C2 and C4
V3
5th intercostal space on the left midclavicular line
v4
on the left on the anterior axillary line, on the level of C4
V5
On the left on the midaxilary on the level of C4
V6
