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ECG 1

QUESTIONS & ANSWERS

QuestionAnswer
The Orientation of all 12 Leads. 6 in the Frontal Plane 6 in the Horizontal Plane
The P-WAVE Atrial Depolarization begins in the SINUS NODE high up in the right side of the ATRIA.
The Horizontal Plane The left Lateral leads V5 & V6 Records a Positive deflection.
Atrial Depolarization in the Horizontal Plane V1 Records a bi-phasic wave, and V6 records a positive Wave.
The PR Interval The PR interval represents time from the start of the atrial depolarization to the start of the ventricular depolarization.
The PR Interval The PR Interval Measures/ normally last from 0.12 to 0.2 seconds and runs along the same baseline of the P-WAVE
Components of a P Wave Right Atrial Component AND Left Atrial Component
A Positive P Wave is shown in which leads? I , II, AvF, AvL, V4, V6
The P-Wave represents? Right Atrial Component pre-dominantly represents RIGHT atrial Depolarization. Left Atrial component represents left atrial Component.
What separates the conduction from the Atria into the Ventricles? A Pause from the heart valves. Right side is the Tricuspid Valve. The Left side is the Bicuspid Valve or Mitral Valve lasting a fraction of a second. (0.0533 Sec)
Three Parts of the Ventricle conducting system. 1) Bundle of HIS 2) Bundle Branches. RBBB & LBBB 3) Terminal Purkinje Fibers.
AVR Looking at the heart from the TOP
AVL Looking at the heart from the LEFT
AVF Looking at the heart from the FOOT-BOTTOM/ FLOOR UPWARDS
Bipolar Leads I II III (Leads 1 11 111)
Lead 1 This lead is going from right to left to positive = BIPOLAR
Augmented Leads Unipolar Leads meaning just one pole
V1 & V2 They are located in the 4th intercostal space, just right and left, respectively, of the sternum
V3 & V4 V4 is in the 5th intercostal space , in line with the middle of the clavicle (mid-clavicular). V3 sits midway between V2 and V4.
V5 & V6 Left Lateral of the Heart
Depolarization Systole
Repolarization Diastole, in the cardiac cycle, period of relaxation of the heart muscle, accompanied by the filling of the chambers with blood.
Systole Systole is when the heart muscle contracts. When the heart contracts, it pushes the blood out of the heart and into the large blood vessels of the circulatory system. From here, the blood goes to all of the organs and tissues of the body. During systole,
SA Node The SA node is considered the pacemaker of the heart with a beat of 60 -100 BPM.
AV Node Floor of the Atrium 40-60 BPM
Definition of The atrioventricular (AV) node The atrioventricular (AV) node is a small structure in the heart, located in the Koch triangle,[1] near the coronary sinus on the interatrial septum. In a right-dominant heart, the atrioventricular node is supplied by the right coronary artery.
Pacemaker Cells The electrical power source of the heart if the heart us under normal circumstances.
Electrical Conducting of the Heart The hard wiring of the Heart.
Myocardial Cells The contractile of the heart
Action Potential Electrical activity of a single cell
The Dominant pacemaker cell Located in the base of the Right Atrium. A group of cells called Sinoatrial (SA) node
What is Catecholamines? Cat-tuh-cola-means Epinephrine and Norepinephrine. These accelerates the SA Node. Normal firing rate but accelerates due to medication.
Vagal Stimulation Slows the SA Node (example an afternoon Nap)
PR Interval 0.12 to 0.20 sec
QRS complex 0.08 and 0.10 sec
Created by: Rachelbl
 

 



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