Kinn's Medical Assistant - Ch.49 - Principles of Electrocardiography
10. myocardial
...
11. arrhythmia
...
12. orthopnea
...
13. sinoatrial (SA) node
...
9. ischemic
...
...
1. aortic arch....................8. inferior vena cava 2. pulmonary artery..........9. right ventricle 3. pulmonary veins........ 10. tricuspid valve 4. mitral valve.................11. AV node 5. Purkinje fibers............12. SA node 6. R & L bundles............13. superior vena cava 7. left ventricle
14. tachycardia
100 > bpm
*Vocabulary Review* 1. bradycardia
< 60 bpm
4. Label the precordial leads on the following drawing.
A. V - 1 B. V - 2 C. V - 3 D. V - 6 E. V - 4 F. V - 5
11. Describe the procedure in the following illustration.
Defibrillation - a machine that delivers an electroshock to the heart through electrodes placed on the chest wall. Corrects V-tach and V-fib
*Fill in the blanks* 12. The _______wave occurs during the contraction of the atria and shows the beginning of cardiac depolarization.
P
14. The ______ interval is the time from the beginning of atrial contraction to the beginning of ventricular contraction
PR
13. The ______complex shows the contraction of both ventricles and also reflects the completion of cardiac depolarization.
QRS
Describe the electrical conduction of the heart.
Signals arising at the SA node stimulate the atria to contract and travel to the AV nodes. After a delay, the stimulus is conducted through the bundle of His to the Purkinje fibers and the endocardium at the apex of the heart, then finally to the ventricular endocardium.
21. augmented
The electrical activity recorded by the 3 __________ leads is relatively small so the ECG machine amplifies the electrical activity of each to record them on the strip.
20. standard or bipolar
The first 3 leads recorded in an electrocardiogram (ECG) are call the __________ or __________ leads because each lead uses two limb electrodes to record the heart's electrical activity.
10. Name the rhythm shown in the following illustration
asystole
18. ectopic
beat doesn't begin in the sinoatrial node (SA)
3. cardiac arrest
complete cessation of cardiac contractions
6. dyspnea
difficulty breathing
5. defibrillator
fibers that
2. bundle of His
fibers that conduct electrical impulses from the atrioventricular node (AV) to the ventricular myocardium
7. hypertension
high blood pressure in which the diastolic pressure is greater than 90 mm Hg
17. myocardium
medical term for the heart muscle
5. Name the rhythm shown in the following illustration.
normal rhythm
16. ECG paper has horizontal and vertical lines at _____ -mm intervals.
one
15. The T wave indicates ventricular recovery, or __________ of the ventricles.
repolarization
19. palpitations
sensation of the heart racing for pounding
6. Name the rhythm shown in the following illustration.
sinus bradycardia
7. Name the rhythm shown in the following illustration.
sinus tachycardia
8. infarction
tissue that has died because of lack of blood supply
16. ventricles
two lower chambers of the heart
15. atria
two upper chambers of the heart
4. cardioversion
use of electroshock to convert an abnormal cardiac rhythm to a normal one
9. Name the rhythm shown in the following illustration.
ventricular fibrillation V-fib
8. Name the rhythm shown in the following illustration.
ventricular tachycardia monomorphic V-tach
