A device on the skin that picks up electrical impulses given off by the heart is known as
electrode
The heart is located
on the left side of the c
... [Show More] hest
The body returns oxygen-poor blood to the heart via the
vena cavae
In lead l, activity of the heart is being measured from
the right arm to the left arm
The human heart weighs approximately
11 ounces
What position should the patient be in for an ECG
supine
Where is the chest electrode V2 located
at the fourth intercostal space at the left margin of the sternum
Lead l, ll, lll are called
standard leads
The right and left atrium are the __________chambers
receiving
The atria contains what kind of blood
both oxygenated and deoxygenated blood
The __________ valve separates the left ventricle from the aorta
aortic
The __________ regulate the flow of blood into and out of the proper chambers
valves
Which electrode is used as a ground reference
right leg
The standard ECG consists of how many leads
12
The contraction of the heart muscle is cause by the flow of ___________ through the muscle tissue
electrical impulse
The __________ pressure is the pressure inside the arteries during ventricular contraction; when blood is pumped from the heart to the body
systolic
The ECG tracing should be performed in a quiet environment because
interference is minimized
(True or False) The ECG records the actual image of the heart
false
The hardest working chamber if the heart is the
left ventricle
What is the term used to refer to an electrocardiogram that is within normal limits
normal sinus rhythm
The augmented leads are
unipolar
The epicardium is the
outer layer of the heart wall
The ability of the pacemaker cells of the heart to create an electrical impulse without being stimulated from another source
automaticity
The precordial leads include
leads V1 to V6
The QRS complex represents
contraction of the ventricles
The "rhythm strip" is usually lead
lead ll
(True or False) An ECG can be used to determine blood pressure
false
The heart has how many valves
four: mitral, tricuspid, aortic, pulmonic
If the SA node does not simulate electrical impulses in the heart, this function is usually taken over by
AV node
Which wave is the first wave of the cardiac cycle
p wave
Which wave represents repolarization of the ventricles
t wave
What are artifacts
interference picked up by the ECG machine
(True or False) Patient psychology can be more important in obtaining a diagnostic ECG than the mechanics of administering ECG
true
Name the condition in which the heartbeat is too rapid, and the rhythm is regular
sinus tachycardia
The part of the conduction system of the heart that is conducting the impulses from the AV node to the ventricles is the
bundle of his
Leads V5 and V6 show what view of the heart
Lateral
If purkinje fibers produce the electrical impulse, the EKG would show a heart rate of
20 - 40 bpm
Infraction occurs when the heart muscle
is dead due to lack of oxygen
What causes sinus bradycardia
dysfunction of the sinoatrial node; when the sinoatrial node fires less than less than 60
During atrial flutter, the atrial beats could fire as many as how many times per minute
250 - 450 bpm
Identify the true statement(s) about sinus tachycardia
- normal response to exercise, stress, fright, flight, anger
- increased sympathetic tone with increased catecholamine release
- beta blockers are useful treatment option if the cause is sympathetic overactivity
In sinus arrhythmia, the heart rate is a variable dependent on
inspiration
How is premature atrial contraction typically diagnosed
- electrocardiogram
- holter monitor
- cardiac event monitor
Atrial flutter is categorized as the type l atrial flutter or type ll atrial flutter. Which statement below accurately describe type ll?
- It's faster than type l (349 - 440 bpm)
- Different re-entry pathway than type l
Why is atrial flutter fibrillation difficult to diagnose
- It may cause no symptoms
- screening is not generally performed
The right ventricle pumps oxygen-poor blood through the pulmonary artery to the
lungs
The left ventricle pumps oxygen-rich blood through the aortic valve to the
tissues all over the body
What is the name given to the modified myocardial cells that set the pace of the heart
SA node
Where the blood exchanges carbon dioxide (CO2) for oxygen
lungs
The muscular wall that separates the left and right side of the heart is the
septum
Deoxygenated blood from the body returns to the heart, entering the
right atrium
(True or False) ECG can be used to evaluate the function of the artificial pacemakers
true
Cardiomegaly is
enlargement of heart
The heart is made up of specialized muscle tissue called
myocardium
The American Heart Association's color code for the lead wire to the right leg is
green
Neurological pathways connect the heart with the __________ of the brain
medulla
Diastole is when the heart muscle
relaxes
Systole is when the heart muscle
contracts [Show Less]