T/F:
The cardiac conduction system is the electrical signaling system that causes the
atria and ventricles to contract which pushes the blood forward
True
Listening to the heart with a stethoscope is known as:
Ausculation
This is known as an abnormal heart rhythm which can cause the heart to beat
too slow (bradycardia) or too fast (tachycardia)
Arrhythmia
What are symptoms of arrhythmia?
Dizziness, shortness of breath, fatigue, lightheadedness, and chest pain
T/F:
Some arrhythmias may have patients feeling as though their heart is beating very
fast, fluttering in their chest or skipping a beat
True
What is used to diagnose arrhythmias?
Electrocardiogram (ECG)
This monitor is an ambulatory ECG device that records the electrical activity of
the heart for 24-48 hours and is used to detect arrhythmias that are intermittent
Holter Monitor
,When the heart goes in and out of normal sinus rhythm (NSR), this is known as:
Intermittent Arrhythmia
Normal sinus rhythm begins in the:
A) Sinoatrial (SA) node
B) Atrioventricular (AV) node
A) Sinoatrial (SA) node
Which of the following is the heart's natural pacemaker?
A) Sinoatrial (SA) node
B) Atrioventricular (AV) node
A) Sinoatrial (SA) node
What is considered normal heart rate?
A) 20 to 40 BPM
B) 40 to 60 BPM
C) 60 to 100 BPM
D) 120 to 180 BPM
C) 60 to 100 BPM
An arrhythmia is caused by a disruption somewhere in the conduction (electrical
signaling) system:
-The SA node can be firing at an abnormal rate or rhythm
-Scar tissue from a prior heart attack can block and divert signal transmission
-Another part of the heart may be acting as the pacemaker
, This is referred to as the movement of ions through channels in the myocytes
that cause the electrical impulses in the cardiac conduction pathway.
Action Potential
Action potentials provide ____ needed to power the heart
Electricity
The SA (pacemaker) cells have automaticity, which means that, unlike other
myocytes, the pacemaker cells initiate their own _____
Action Potential
A heartbeat is initiated when rapid ventricular depolarization occurs in response
to an influx of NA which causes ventricular contraction (represented by the QRS
complex on the ECG):
A) Phase 0
B) Phase 1
C) Phase 2
D) Phase 3
E) Phase 4
A) Phase 0
Early rapid repolarization (Na channels close):
A) Phase 0
B) Phase 1
C) Phase 2
D) Phase 3
E) Phase 4
B) Phase 1
A plateau in response to an influx of Ca an efflux of K:
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