10 Flashcards
What does EKG measure/record
Heart’s electrical activity
P wave
Arterial depolarization (contraction)
QRS complex
Ventricular depolarization (contraction)
T wave
Repolarization of ventricales (relaxation)
12 lead EKG chest leads
V1-V6
12 lead EKG limb electrodes
Arms (R/L) and legs (R/L)
Location of ground wire in 12 lead EKG
R leg
V1 location
4th intercostal space
R of sternum
Location of V2
4th intercostal space
L of sternum
Location of V4
5th intercostal space
Midclavicular
Location of V6
5th intercostal space
Mid axillary line
Location of V3
Halfway between V2 and V4
Location of V5
Halfway between V4 and V6
Measurement of voltage is on the
Vertical axis
Measurement of time is on the
Horizontal axis
Normal route of electrical conduction
SA node -> interarterial path -> AV node -> bundle of His -> purkinje fibers
Normal pacemaker of heart and rate
SA node 60 - 100 bpm
System of backup pacemakers and their rate
Junctional tissue (surrounds AV): 40-60 BPM
Bundle Branch Tissue: 40-60 bpm
Ventricular tissue: 20-40 bpm
QRS interval normal width of duration
0.36-0.44
PR Interval width of duration
0.12 - 0.2
Acute hypoxia rhythm
Sinus tachycardia
Life threatening rhythms that require CPR
V tach w/out pulse
V fib (coarse and fine)
PEA (NOT SHOCKABLE)
Asystole (NOT SHOCKABLE)
Cardiac ischemia ekg identifier
ST depression
Determine rate on ekg
Counted beats x 10
