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