Ch 42: Principals Of Electrocardiography

Question 1

The two upper chambers of the heart

Answer 1

Atria

Question 2

The part of the cardiac conduction system between the atria and the ventricles

Answer 2

Atrioventricular node

AV node

Question 3

Specialized muscle fibers that conduct electrical impulses from the AV node to the ventricular myocardium.

Answer 3

Bundle of His

Question 4

I can decision in which cardiac contractions stop completely.

Answer 4

Cardiac arrest

Question 5

The use of electroshock to convert an abnormal cardiac rhythm into a normal one

Answer 5

Cardioversion

Question 6

A machine that delivers and electroshock to the heart through electrodes placed on the chest wall

Answer 6

Defibrillator

Question 7

The period of relaxation of the chambers of the heart, during which blood enters the heart from the vascular system and the lungs.

Answer 7

Diastole

Question 8

Originating outside the normal tissue.

Answer 8

Ectopic

Question 9

An area of tissue that has died from lack of blood supply.

Answer 9

Infarction

Question 10

Decreased blood flow to a body parts or Oregon, caused by construction or blockage of the supplying artery.

Answer 10

Ischemia

Question 11

Electrical connections attached to the body to record electrical heart activity; any of the conductors connected to the electrocardiograph, each comprising two or more electrodes that are attached at specific body sites and it used to examine and record the electrical activity of the heart.

Answer 11

Leads

Question 12

Pertaining to the heart muscle

Answer 12

Myocardial

Question 13

Pounding or racing of the heart; it may or may not indicate a serious heart disorder.

Answer 13

Palpitations

Question 14

The pacemaker of the heart, located in the right atrium

Answer 14

Sinoatrial node

SA node

Question 15

The period of contraction of the heart.

Answer 15

Systole

Question 16

To lower chambers of the heart.

Answer 16

Ventricles

Question 17

A Dutch physiologist who developed Techniques to record the electrical activity of the heart in the late 1800s

Answer 17

William Einthoven

Question 18

Heart activity: Atrial contraction

Electrical current: Atrial depolarization

Answer 18

P wave

Question 19

Heart activity: Contraction transversing the atrioventricular node

Electrical current: Depolarization transversing the AV node

Answer 19

PR interval

Question 20

Heart activity: Ventricular contraction; electrical stimulation travels from the AV node to the Purkinje fibers.

Electrical current: Ventricular depolarization and atrial repolarization

Answer 20

QRS complex

Question 21

Heart activity: Time interval between ventricular contraction and the beginning of the ventricular recovery

Electrical current: Time interval between ventricular contraction and the beginning of the ventricular repolarization

Answer 21

ST segment

Question 22

Heart activity: Ventricular contraction subsides

Electrical current: ventricularrepolarization; atrial polarization begins

Answer 22

T wave

Question 23

Heart activity: Associated with further ventricular relaxation

Electrical current: Purkinje fibers repolarization

Answer 23

U wave

Question 24

Heart activity: The heart at rest

Electrical current: Ventricular and atrial polarization

Answer 24

Baseline

Question 25

Heart activity: Time interval between atrial contraction and ventricular contraction; electrical stimulation travels from the SA noads to the AV nodes.

Electrical current: Time interval between atrial depolarization and ventricular depolarization

Answer 25

PR interval

Question 26

Heart activity: Time interval between the beginning of ventricular contraction and the subsiding of ventricular contraction; electrical stimulation travels from the AV node to the Purkinje fibers

Electrical current: Time interval between the beginning of ventricular depolarization and ventricular repolarization (electrical recovery)

Answer 26

QT interval