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23 Cards in this Set

  • Front
  • Back
atrial T wave
occurs about 0.15-0.2 seconds after P wave termination (usually obscured by ventricular depolarization (QRS complex))
time range of repolarization in ventricular fibers
0.20 to 0.35 seconds
Voltage of QRS vs T
T is much less due to prolonged length
10 small divisions up and down in EKG
1 millivolt
25 mm horizontal direction in EKG
1 seond (divided into five 0.2 seond intervals which is broken into five 0.04 second intervals)
Voltge of EKG
varies on electrode placement (can be up to 3-4 mV)
between arms and legs mV range
1-1.5 mV from top of R to bottom of S
PQ or PR interval Beginning of P and Q)
time between atria excitation and ventricular excitation (0.16 s)
QT interval (beginning of Q, end of T)
contration of ventricles (0.35 s)
Determining Heart rate from EKG
60/(time interval between heartbeats)
averge current flow in heart
negativity toward base and positivity toward apex
Why does current flow reverse for 0.1 s immediately before depolarization ends
last part of heart to depolarize is the outer walls near base of heart
electrode with positive reading
lead connected to positive terminal is more positive
EKG lead
combination of two wires and their electrodes making a complete circuit between body and EKG
Lead I
neg terminal R arm, positive terminal L arm
Lead II
neg terminal R arm, positive terminal L leg
Lead III
neg terminal L arm, positive terminal L leg
Eithoven's Law
If two leads are known, can find 3rd by adding the two known leads
Diagnosing arrhythmias
Doesn't matter which lead you use, diagnosed by distance between peaks
Diagnosing abnormalities of muscle contration or impulse conduction
change patterns of some leads and doesn't affect others
chest leads (V1-V6)
records relatively minute abnormalities in ventricles (V1-V6 are positive; indifferent electrode (arms, L leg) are negative)
V1 and V2
record negative because they are nearer the base of heart
Augmented unipolar limb leads
Two limb leads connected to negative and one to positive (names after limb connected to positive)