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EKG

Review for EKG test

QuestionAnswer
Another name for the baseline Iso Electric Line
Any deflection off the baseline is called a wave
The distance between two waves segment
the length of a wave and a segment interval
heat and pressure sensitive EKG paper
Normal paper speed 25mm/sec
Normal standarization 10mm, 0.2 sec
vertical plane represents voltage
horizontal plane represents time
how much time in one small square? .04 secs
how much time in one large square? 0.2 secs
time period when the myocardial cell cannot respond to stimulus Refraction Period
ability of the myocardial cell to depolarize and polarize Action Potential
part of EKG machine converts electrical activity into mechanical motion Galvonometer
the writing implement on EKG machine stylus
wave = Atrial depolarization P wave
wave= Ventricular depolarization QRS Complex
wave= Ventricular repolarization T Wave
SA Node inherent rate 60-100bpm
AV Node inherent rate 40-60bpm
Purkinje Fibers inherent rate 20-40 bpm
on all sinus EKG's, the initiation of the impulse is SA Node
Normal value of PR Interval 0.12-0.20
Wave not usually seen on EKG indicates electrolyte imbalance U wave
how many waves are in one cardiac cycle? 5
1 heart beat- 1 systole + 1 diastole 1 cardiac cycle
two or more waves together "QRS" complex
Electrocardiogram is used to diagnose arrhythmia, ischemia, electrolyte imbalances and myocardial injury
the Amplifyer in EKG machine increases voltage or intensity of weaker signal
how many leads on EKG 12
how many electrodes 10
Limb Leads, 3 standard augmented AVR, AVL, AVF
how many chest leads? 6
Place V1 4ICS R margin of sternum
place V2 4ICS L margin of sternum
place V3 midway between V2 & V4
place V4 5ICS @ mid-clavicular line
place V5 5ICS @ left anterior Axillary line
Place V6 5ICS @ mid Axillary line
Lead I records V between RA & LA
Lead II voltage between RA & LL
Lead III voltage between LA & LL
RL ground wire reference point
V1 is red
V2 yellow
V3 green
V4 blue
V5 orange
V6 purple
Limb Leads colors white, green, black, red
RA white
LL red
LA black
RL green
another name for standard leads bipolar
another name for augmented leads unipolar
another name for chest leads precordial
direction of electrical impulses vector
3 augmented leads avl, avf, avr
standard limb leads lead I,II, III
chest leads V1-V6
lead records act f/mdpt b/w LA/LL AVR
Created by: Gmtassa23