問題一覧
1
Where should the positive electrode for lead V1 be positioned?
right side of the sternum, fourth intercostal space
2
Lead I is perpendicular to lead ____
aVF
3
Patients who experience a(n) ____myocardial infarction have a greater incidence of heart failure and cardiogenic shock than those who have myocardial infarctions affecting other areas of the left ventricle.
anterior
4
Lead V1 views the__
septum
5
second degree AV block type I is caracterized by ___ intervals
regular P to P and irregular R to R
6
tall, peaked T waves observed on the ECG are most commonly see in patients with ___
hyperkalemia
7
Hyperthory refers to a(n)_____
increase in the tickness of a heart chamber because of chronic pressure overload
8
the QRS complex associated with a third-degree AV block is always wide.
false
9
The inferior wall of the left ventricle is supplied by the _____coronary artery in most of the population.
right
10
The first segment of the left coronary artery is the _ artery.
left main coronary
11
In pacing, sensitivity refers to ___
ability of a pacemaker to recognize and respond to instructions electrical activity
12
The term ectopic refers to an extra muscle bundle consisting of working myocardial tissue that forms a connection between the atria and ventricles outside the normal conduction system.
false
13
In the limb leads, the ST segment is normally isoelectric.
true
14
Leads V4R, V5R, and V6R are used to view the posterior wall of the left ventricle.
false
15
Lead V5 views the ____ wall of the left ventricle
lateral
16
An ECG rhythm strip shows a regular ventricular rhythm at a rate of 30 beats/min, more P waves than QRS complexes (the P waves occur regularly), a variable PR interval, and a QRS duration of 0.14 second. This rhythm is____
third degree AV block
17
the term accute coronary syndromes refers to patient presenting with ischemic chest pain
true
18
lead I views the___
lateral wall of the left ventricle
19
AV block is caracterized by___ intervals.
regular P to P interval and regular R to R
20
in third-degree AV block ___
there is no PR interval because the atria and ventricle beat independently of each other
21
Which leads face the septum?
V1, V2
22
Individuals with preexcitation syndrome are predisposed to tachyayshythmias.Individuals with preexcitation syndrome are predisposed to tachyayshythmias.
true
23
delay or block that occurs in one of the bundle branches affects ventricular depolarization.
true
24
The second letter of the pacemaker identification code represents____
the chamber sensed
25
A Q wave, if present, is always a negative waveform.
true
26
In second-degree and third-degree AV blocks ____
P waves ocur regularly
27
Transcutaneous pacing is the treatment of choice for pulseless ventricular tachycardia or ventricular fibrillation.
false
28
Which of the following leads are chest leads?
V1 V2 V3 V4 V5 V6
29
What is meant by the term pulseless electrical activity (PEA)?
an organized rhythm on the cardiac monitor although a pulse is not present
30
Most of the bundle branch tissue is supplied by the ____ coronary artery
left
31
Cardiac output is the amount of blood pumped into the aorta each minute by the heart.
true
32
The first letter of the pacemaker identification code represents___
the chamber paced
33
Capture is___
ability of pacing stimulus to successfully depolarize the cardiac chamber that is being paced
34
Myocardial ischemia delays the process of repolarization; therefore, the ECG changes characteristic of ischemia include____
change in the ST segment and T wave
35
In most ECG leads, a normal Q wave is less than 0.04 second in duration and less than one third of the ampute of the R wave in that lead.
true
36
Which of the following leads are anatomically contiguous?
V2 V3 V4
37
Lead II views the ___ wall of the left ventricle
inferior
38
The electrocardiogram (ECG) is a reflection of the heart's mechanical activity.
false
39
The six limb leads view the heart in the frontal plane as if the body were flat.
true
40
the myocardium is thickest in the___
left ventricle
41
The point where the QRS complex and ST segment meet is called the ST junction or the J point.
true
42
Anterior or lateral wall myocardial infarctions are most often a result of an occlusion of the ____coronary artery.
lateral
43
how are frequent PACS usually managed?
correcting underline cause
44
the anterior surface of the heart consist of the ____
right ventricle
45
Lead aVL views the___
lateral wall of left ventricle
46
where should the positive electrode for lead V5 be positioned?
left anterior axilary line at the same line as V4
47
Depolorazation is the same as contraction
false
48
Lead III views the___ wall of left ventricle
inferior
49
A macro reentrant circuit is one that involves a small area of heart tissue, usually a few centimeters or less.
false
50
Second-degree AV block type II is caracterized by__ intervals
irregular P to P