68wm6 p2 Car. Dys.
Cardiac Dysrhythmias
Question Answer
How does the
sympathetic nervous
system affect the heart
rate?
Speeds it up.
How does the
parasympathetic nervous
system affect the heart
rate?
Slows it
...
68wm6 p2 Car. Dys.
Cardiac Dysrhythmias
Question Answer
How does the
sympathetic nervous
system affect the heart
rate?
Speeds it up.
How does the
parasympathetic nervous
system affect the heart
rate?
Slows it down.
Define cardiac
automaticity:
inherent (intrinsic) ability to
contract in a rhythmic pattern.
Abiity of the heart to sustain its
own impulses.
Define cardiac
irritability: ability to respond to a stimulus.
At what rate does the SA
node generate impulses? 60-100 a minute
When the impulse leaves
the SA node, how does it
travel through the atria?
Through the bachmans bundle
and internodal pathways.
At what rate can the AV
node generate impulses
if not recieved from the
SA node?
40-60 per minute (the back-up
pacemaker of the heart)
Define purkenje fibers
A diffuse network of muscle
fibers located just beneath the
endocardium, resulting in
contraction and emptying of the
ventricles.
At what rate can the
purkenje fibers generate
impulses if not recieved
from the SA and AV
nodes?
20-40 per minute
The electrocardiogram
gives how many views
of the hearts electrical
activity with how many
electrodes?
12 leads(views) from 10
electrodes
What is the cardiac cycle
composed of?
Electrical activity caused by
automaticity and the
mechanical response of
contraction.
What are the two phases
of the ELECTRICAL
activity of the heart?
Depolorization and
Repolarization.
What are the two phases
of the MECHANICAL
activity of the heart?
Systole and Diastole
a 1mm square (small
box) on an EKJ sheet
represents how many
seconds?
0.04 seconds
a 5mm section (large
box) of and EKG sheet
represents how many
seconds?
0.20 seconds
What does the vertical
axis of the EKG
represent?
Voltage
A 1 mm grid interval on
the verticle axis
represents what?
0.1 mV (one millivolt)
What is the most exact
method to determin a
regular rhythm using an
EKG?
1500 method
What is the Positive
(upward) Complex?
Heart’s current flows towards
the positive electrode
What is the Biphasic
Complex?
Heart’s current flows
perpendicular to the positive
electrode
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