EKG Basics Flashcards
It is through _____ that we are able to
diagnose many different cardiac disorders.
disruptions of the normal
electrical patterns
Under normal circumstances, these are
the electrical power source of the heart
Pacemaker Cells
The hard wiring of the heart, conducting
depolarization waves quickly
Electrical Conducting Cells
______ is the fundamental electrical event of the heart
Depolarization
T/F Depolarization and repolarization are both detectable by electrodes on the skin surface
T
What do the electrodes do during an EKG?
Each electrode detects the impulses
of the heart from a different
location, and the tracings are
different depending on the position.
A wave of depolarization moving directly
towards a positive electrode will cause a
____ deflection on the EKG
positive
A wave of depolarization moving directly away
from a positive electrode will cause a _____
deflection on the EKG
negative
A wave of repolarization moving toward a positive electrode will cause a
____ deflection,
negative
a wave of repolarization moving away from a
positive electrode will cause a _____ deflection
positive
EKG Axis’
Horizontal axis is duration of time (seconds); vertical axis is amplitude (mVs)
1 little EKG box = ____ seconds, and 1 big box = ___ seconds.
0.04; 0.2
It is in Lead ____ that you will see the classic,
characteristic EKG tracing of the cardiac cycle.
II
first part of the P wave predominantly
represents _____
right atrial depolarization.
If the first deflection of the QRS is
downward, it is called the ____
Q wave.
The first upward deflection is always
called the ____
R wave.
If there is a second upward deflection,
it is called ____
R’ (R-prime).
Ventricular depolarization happens so quickly that the normal duration of
a QRS complex is ____
Less than 3 little boxes (less than 0.12seconds).
QRS ends with the _____
J Point
____ - A straight line connecting two waves
Segment
____- A straight line that encompasses at least one wave plus the
connecting straight line.
Interval
Time between ventricular depolarization
and repolarization.
ST Segment
Duration of time from the start of atrial depolarization to
the start of ventricular depolarization
PR interval
Duration of time from start of ventricular depolarization
to the end of ventricular repolarization.
QT Interval
