ch.2: recording the EKG Flashcards
How big are the smaller squares on EKG paper?
1 millimeter (mm) squares
how big are the darker boxes on EKG paper?
5 small squares long and each side is 5 mm long
what is 10 mm in y-axis?
1 millivolt (mV) or 2 big boxes
is upward deflection positive or negative?
positive (y-axis)
is downward deflection positive or negative?
negative (y-axis)
what are the boxes measured as?
millimeters
what is measured in the x-axis?
horizontal axis = time
what time does the paper run at?
25 mm/sec
how long is each 1 mm?
0.04 sec
how long (time) are the big squares?
- 0.2 seconds
- 5 sq of 1 mm x 1 mm
- 5 x 0.04 s = 0.2 sec
what does time show on an EKG?
duration of any segment of a cardiac cycle
What are the 4 limb electrodes?
- Right arm
- Left arm
- Right leg
- Left leg
What are the 6 chest electrodes?
V1 to V6
What does the V represent?
chest leads
RA
Near right shoulder, off of deltoid just under the distal right clavicle
LA
Near left shoulder, off of deltoid just under the distal left clavicle
RL
Above the right hip, may want to move up to the base of the ribs to avoid body fat and the movement during exercise
LL
Above the left hip, may want to move up to the base of the ribs to avoid body fat and the movement during exercise
V1
Fourth intercostal space on the right sternal border
V2
Fourth intercostal space on the left sternly border
V3
Halfway between V2 and V4, off of the pectoral muscle and breast tissue
V4
Fifth intercostal space on the left, mid-clavicular line, off of the pectoral muscle and/or breast tissue
V5
Left anterior axillary line at the same level as V4
V6
Left mid axillary line at the same level as V4 and V5
Lead I
- Left arm positive
- Right arm negative
Lead II
- Left leg positive
- Right arm negative
Lead III
- Left arm negative
- Left leg positive
What are the 3 unipolar limb leads?
- AVF
- AVR
- AVL
What does AV mean?
Augmented voltage
What are the bipolar limb leads?
- Lead I
- Lead II
- Lead III
