The Spark (Conduction)
Known as the "Natural Pacemaker" of the heart.
What is the SA Node?
This wave represents atrial contraction (atrial depolarization).
What is the P-Wave?
The measurement of time in one small box.
What is 0.04 seconds?
This calculation method is used for irregular rhythms only.
What is the 6-Second Method?
If the spacing between all R-waves is equal across the strip, the rhythm is classified as this.
What is Regular?
This node creates a "delay" to let the ventricles fill with blood.
What is the AV Node?
This complex represents the ventricles squeezing.
What is the QRS Complex?
The measurement of time in one large (5x5) box.
What is 0.20 seconds?
You divide this number by the amount of large boxes between two R-waves.
What is 300 method?
To be "Normal," the Heart Rate must fall between these two numbers.
What is 60 and 100 BPM?
These fibers distribute the electrical signal through the ventricular muscle.
What are the Purkinje Fibers?
This wave represents the ventricles "recharging" or recovering.
What is the T-Wave?
Standard calibration height (10mm) is equal to this many large boxes.
What is 2 large boxes?
You divide this number by the amount of small boxes for the most accurate rate.
What is 1500 method?
This specific measurement must be between 0.12 and 0.20 seconds (3-5 small boxes) to be considered normal.
What is the PR Interval?
This is the path the signal takes after leaving the AV Node but before reaching the Purkinje Fibers.
What is the Bundle of His?
This is measured from the start of the P-wave to the start of the QRS.
What is the PR Interval?
Five large boxes added together equals this much time.
What is 1.0 full second?
You count 12 R-waves on a 6-second strip. What is the heart rate?
What is 120 BPM?
To be considered "Normal," the QRS complex must be narrow, measuring less than this many seconds.
What is 0.12 seconds?
If the SA Node fails, this node takes over as the backup at a rate of 40-60 bpm.
What is the AV Node?
This is the baseline or "flat line" between waves where no electricity is flowing.
What is the Isoelectric Line?
If a QRS complex is 3 small boxes wide, this is its duration in seconds.
What is 0.12 seconds?
A regular rhythm has 25 small boxes between R-waves. What is the BPM?
What is 60 BPM?
For a rhythm to be "Sinus," every QRS complex must be preceded by exactly one of these waves.
What is a P-wave?