Reading ECG Strips Flashcards
In an ECG, how many seconds does one small box equal?
0.04 seconds
In an ECG strip, how many seconds does one large box equal?
0.20 seconds
On an ECG strip, what does the “P wave” represent?
Atrial Depolarization
Conduction began @ the SA node
What does it mean for a P wave to be inverted?
Conduction in Atria began in opposite direction and originated in AV junctional tissue
Define Atrial Kick
- Atrial Contraction
2. Atrial Depolarization
What are some effects of an increased HR?
- Decreased time for appropriate filling
2, Decrease in Cardiac Output - Increased Oxygen consumption
What hormone is activated after there is a decrease in BP AND WHAT IS THE EFFECT?
Norepinephrine is activated
Increases HR
What is the normal measurement for PR interval?
From beginning of Pwave to beginning of Q:
0.12 – 0.20 seconds
What is the normal measurement of QRS interval?
From Q – S:
0.06 – 0.10 Seconds
What is the normal measurement of the QT interval?
From beginning of Q to end of T:
0.28 – 0.40
In an ECG Strip how much time passes in one small box? How many small boxes are in one large box?
0.04 seconds passes
5 small boxes in one large box.
What is a negative deflection?
When the energy from depolarization flows toward a negative electrode or away from a positive electrode.
What is a positive deflection?
When depolarization energy flows toward a positive electrode or away from a negative electrode.
Unifocal
Identical Shapes in PVC’s
Monomorphic
Electrical impulse arises from same atrial or ventricular cardiac cell.
ALL WAVES WILL LOOK THE SAME!
