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ECG: Graphic representation of the electrical activity of the heart
SA Node: Specialized cells that initiates the heart beats, sets its pace and has a rate of 60-100 impulses.
AV Node: Specialize cells located in the lower right atrial septum-has a rate of 40-60 impulses per minute.
Bundle of His: Has an intrinsic rate of 20-40 impulses per minute.
Automaticity: The ability of cardiac cells to generate its own electrical stimulus
Conductivity: Cardiac cells to receive a stimulus from a neighboring cell and pass it to the next.
Polarization: Cardiac cells are in a resting, negatively charged state
Depolarization: Cells are discharging a positively charged electrical impulse to create a contraction
Repolarization: Transformation of cardiac cells from an active to resting state for recharging.
P Wave: Demonstrates atrial depolarization
QRS Complex: Demonstrates ventricular depolarization
T Wave: Demonstartes ventricular repolarization
Isoelectric Line: There is no upward or downward deflection is present indicating no electrical activity or voltage
Segment: Lines between or connecting waves.
Interval: A wave in addition to a connecting line.
Large Block (Horizontally) 0.2 Seconds
Large Block (Veritically) 0.5 Millivolts
Unipolar Leads: Represent 9 out of 12 leads
aVR: Heart voltage between right arm electrode and a central point between left arm and left leg
aVL: Heart voltage between left arm electrode and a central point between right arm and left leg
aVF: Heart voltage between left leg electrode and a central point between right arm and left arm
V1: Electrode is placed at the fourth intercostal space just to the right of the sternum
V2: Electrode is placed at the fourth intercostal space just to the left of the sternum.
V4: Electrode is placed at the left mid-clavicular line in the fifth intercostal space.
V3: Electrode is placed midway between leads V2 and V4.
V5: Electrode is placed anterior left axillary line at the same level as V4.
V6: The electrode is placed at the left mid-axillary line at the same level as lead V4.
Artifact: Defects on the electrocardiogram due to the electrical activity of the heart interferes.
Wandering Baseline Artifact: Caused by loose electrodes.
Bipolar Lead: Measures cardiac electrical activity between two extremities; between a negative and a positive electrode.
Lead I: Measures electrical activity from the right arm to the left arm
Lead II: Used for rhythm lead.
Lead III: Measures electrical activity from left arm to left leg.
Somatic Tremor: Due to involuntary muscle movement aka muscle artifact.
Small Block (Horizontally) 0.04 Seconds
Small Block (Vertically) ?
Created by: itsdelis