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Clinical Applications Week 2 Terms

ECG / EKG Electrocardiogram
SA node Sinoatrial Node
AC interference Artifact on an ECG tracing caused by electrical interference example/cell phone
P wave represents atrial depolarization
PR interval represents the time it takes for the electrical impulse to travel from the SA node to the AV node. Normal range is 0.12 to 0.20 seconds
QRS representative of ventricular depolarization normal range for a QRS complex is 0.06-0.10 sec
QT interval the time from the beginning of the QRS complex, representing ventricular depolarization, to the end of the T wave normal range 0.4-0.44 sec
T wave represents ventricular repolarization
Artifact Anything artificially produced on an ECG
Arrhythmia Abnormal Rhythm of heart beat
Asystole Absence of heart beat (Cardiac arrest)
Atrial Tachycardia rapid heart rate, causing the P wave to be unidentifiable or hidden in the previous T wave
Baseline Initial measurement for future comparing
Bradycardia Slow heart rate, less than 60 bpm
Bundle of His part of the electrical system of the heart, it transmits impulses from the AV node to the ventricles of the heart
Diastole Relaxation of the heart
Precordial Pertaining to the precordium, refers to the chest leads placed on the patient for ECG testing
Polarization cardiac cells in a resting, negatively charged state
Purkinje fibers networks of fibers that receive conductive signals originating at the AV node and simultaneously activate the left and right ventricles by directly stimulating the ventricular myocardium
Sinus Rhythm Any cardiac rhythm in which depolarization of the cardiac muscle begins at the sinus node
Normal sinus rhythm regular rate (60-100bpm) and rhythm seen on the ECG
Somatic Tremor Interference/artifact throughout the ECG tracing, often caused by patient movement or shivering
Systole The contraction of the heart
Tachycardia Fast heart rate greater than 100 bpm
Wandering baseline artifact on an ECG commonly caused by loose electrodes
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