Medca EKG Practice 58 Questions with Verified Answers
A device on the skin that picks up electrical impulses given off by the heart is known as -
... [Show More] CORRECT ANSWER electrode
The heart is located - CORRECT ANSWER on the left side of the chest
The body returns oxygen-poor blood to the heart via the - CORRECT ANSWER vena cavae
In lead l, activity of the heart is being measured from - CORRECT ANSWER the right arm to the left arm
The human heart weighs approximately - CORRECT ANSWER 11 ounces
What position should the patient be in for an ECG - CORRECT ANSWER supine
Where is the chest electrode V2 located - CORRECT ANSWER at the fourth intercostal space at the left margin of the sternum
Lead l, ll, lll are called - CORRECT ANSWER standard leads
The right and left atrium are the __________chambers - CORRECT ANSWER receiving
The atria contains what kind of blood - CORRECT ANSWER both oxygenated and deoxygenated blood
The __________ valve separates the left ventricle from the aorta - CORRECT ANSWER aortic
The __________ regulate the flow of blood into and out of the proper chambers - CORRECT ANSWER valves
Which electrode is used as a ground reference - CORRECT ANSWER right leg
The standard ECG consists of how many leads - CORRECT ANSWER 12
The contraction of the heart muscle is cause by the flow of ___________ through the muscle tissue - CORRECT ANSWER electrical impulse
The __________ pressure is the pressure inside the arteries during ventricular contraction; when blood is pumped from the heart to the body - CORRECT ANSWER systolic
The ECG tracing should be performed in a quiet environment because - CORRECT ANSWER interference is minimized
(True or False) The ECG records the actual image of the heart - CORRECT ANSWER false
The hardest working chamber if the heart is the - CORRECT ANSWER left ventricle
What is the term used to refer to an electrocardiogram that is within normal limits - CORRECT ANSWER normal sinus rhythm
The augmented leads are - CORRECT ANSWER unipolar
The epicardium is the - CORRECT ANSWER 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 - CORRECT ANSWER automaticity
The precordial leads include - CORRECT ANSWER leads V1 to V6
The QRS complex represents - CORRECT ANSWER contraction of the ventricles
The "rhythm strip" is usually lead - CORRECT ANSWER lead ll
(True or False) An ECG can be used to determine blood pressure - CORRECT ANSWER false
The heart has how many valves - CORRECT ANSWER four: mitral, tricuspid, aortic, pulmonic
If the SA node does not simulate electrical impulses in the heart, this function is usually taken over by - CORRECT ANSWER AV node
Which wave is the first wave of the cardiac cycle - CORRECT ANSWER p wave
Which wave represents repolarization of the ventricles - CORRECT ANSWER t wave
What are artifacts - CORRECT ANSWER 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 - CORRECT ANSWER true
Name the condition in which the heartbeat is too rapid, and the rhythm is regular - CORRECT ANSWER 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 - CORRECT ANSWER bundle of his
Leads V5 and V6 show what view of the heart - CORRECT ANSWER Lateral
If purkinje fibers produce the electrical impulse, the EKG would show a heart rate of - CORRECT ANSWER 20 - 40 bpm
Infraction occurs when the heart muscle - CORRECT ANSWER is dead due to lack of oxygen
What causes sinus bradycardia - CORRECT ANSWER 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 - CORRECT ANSWER 250 - 450 bpm
Identify the true statement(s) about sinus tachycardia - CORRECT ANSWER - 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 - CORRECT ANSWER inspiration
How is premature atrial contraction typically diagnosed - CORRECT ANSWER - 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? - CORRECT ANSWER - It's faster than type l (349 - 440 bpm)
- Different re-entry pathway than type l
Why is atrial flutter fibrillation difficult to diagnose - CORRECT ANSWER - It may cause no symptoms
- screening is not generally performed
The right ventricle pumps oxygen-poor blood through the pulmonary artery to the - CORRECT ANSWER lungs
The left ventricle pumps oxygen-rich blood through the aortic valve to the - CORRECT ANSWER tissues all over the body
What is the name given to the modified myocardial cells that set the pace of the heart - CORRECT ANSWER SA node
Where the blood exchanges carbon dioxide (CO2) for oxygen - CORRECT ANSWER lungs
The muscular wall that separates the left and right side of the heart is the - CORRECT ANSWER septum
Deoxygenated blood from the body returns to the heart, entering the - CORRECT ANSWER right atrium
(True or False) ECG can be used to evaluate the function of the artificial pacemakers - CORRECT ANSWER true
Cardiomegaly is - CORRECT ANSWER enlargement of heart
The heart is made up of specialized muscle tissue called - CORRECT ANSWER myocardium
The American Heart Association's color code for the lead wire to the right leg is - CORRECT ANSWER green
Neurological pathways connect the heart with the __________ of the brain - CORRECT ANSWER medulla
Diastole is when the heart muscle - CORRECT ANSWER relaxes
Systole is when the heart muscle - CORRECT ANSWER contracts [Show Less]
