Chapter One Flashcards
Define Lead I
Left Arm Positive
Right Arm Negative
Angle of Orentation 0°
Define Lead II
Legs Positive
Right Arm Negative
Angle of Orentation 60°
Define Lead III
Legs Positive
Left Arm Negative
Angle of Orentation 120°
The six leads placed across the chest are also known as the?
Precordial Leads
Name the three heart cell types:
Pacemaker Cells
Electrical Conducting Cells
Myocardial Cells
Name the three fascicles:
Septal
Anterior
Posterior
What is it called when cardiac cells lose their internal negativity?
Depolarization
What are the contractile proteins responsible for myocardial cell contraction?
Actin and Myosin
Define aVR
Right Arm Positive
Other Limbs Negative
Angle of Orientation -150
Define aVF
Legs Positive
Other Limbs Negative
Angle of Operation +90
Define aVL
Left Arm Positive
Other Limbs Negative
Angle of Orientation -30
What’s another name for leads II, III, AVF?
Inferior leads
What’s another name for leads I and aVL?
Left lateral leads
Define the PR Interval:
0.120 to 0.200
Start of the P Wave to the start of the Q Wave
Define normal septal Q Wave amplitude:
Not greater than 0.1 mV.
Define the normal range for the QRS complex.
0.06 to 0.100
What is the normal height of a T Wave.
1/3rd to 2/3rds the height of the R Wave
What is the normal axis of the heart?
+90 to -30
Which direction does the septal fascicle depolarize the ventricular septum.
From left to right.
V4 and V6 should be placed in which intercostal?
5th
Define “R Wave” Progression
The pattern of progressively increasing R wave amplitude moving right to left in the precordial leads.
Define “Transition Zone”
The QRS complex goes from being predominantly negative to predominantly positive. The normal transition zone occurs at leads V3 and V4.
