Packet 8 - Circulatory Function Part 2

Question 1

Electrocardiogram

Represents depolarization of SA node and atria.

1. ) P wave
2. ) T wave
3. ) QRS complex
4. ) isoelectric line

Answer 1

P wave

Represents depolarization of SA node and atria.

Question 2

Electrocardiogram

Between P wave and Q wave. Represents depolarization of AV node, bundle branches, and Purkinje system.

1. ) P wave
2. ) T wave
3. ) QRS complex
4. ) isoelectric line

Answer 2

isoelectric line

Between P wave and Q wave.

Represents depolarization of AV node, bundle branches, and Purkinje system.

Question 3

Electrocardiogram

Represents ventricular depolarization.

1. ) P wave
2. ) T wave
3. ) QRS complex
4. ) isoelectric line

Answer 3

QRS complex

Represents ventricular depolarization.

Question 4

Electrocardiogram

Represents ventricular repolarization.

1. ) P wave
2. ) T wave
3. ) QRS complex
4. ) isoelectric line

Answer 4

T wave

Represents ventricular repolarization.

Question 5

Sinus Node Dysrhythmias

Question 6

A fib

Question 7

Disorders of AV Conduction

Link (conduction) between atria and ventricles is completely lost, causing the atria and ventricles to beat independently (no coordination) of each other.

a. ) first-degree heart block
b. ) second-degree heart block
c. ) third-degree heart block (complete)

Answer 7

c.) third-degree heart block (complete)

Link (conduction) between atria and ventricles is completely lost, causing the atria and ventricles to beat independently (no coordination) of each other.

Heart block → abnormal conduction through AV node/bundle of His

Question 8

Disorders of AV Conduction

Delayed (slowed way down) conduction, but all sinus impulses are conducted through (still QRS after every P wave).

a. ) first-degree heart block
b. ) second-degree heart block
c. ) third-degree heart block (complete)

Answer 8

a.) first-degree heart block

Delayed conduction, but all sinus impulses are conducted through.

Heart block → abnormal conduction through AV node/bundle of His

Question 9

Disorders of AV Conduction

Intermittent failure of conduction of one or more impulses from atria to ventricles (not every P wave has a QRS complex after it).

a. ) first-degree heart block
b. ) second-degree heart block
c. ) third-degree heart block (complete)

Answer 9

b.) second-degree heart block

Intermittent failure of conduction of one or more impulses from atria to ventricles.

Heart block → abnormal conduction through AV node/bundle of His

Question 10

Ventricular Dysrhythmias

Caused by ventricular ectopic stimulus → distortion of QRS complex (wide, bizarre looking). Ventricles are not sufficiently filled to eject blood, since depolarization is premature. In absence of heart disease, may not be clinically significant; however, if frequent, predisposes to other more serious dysrhythmias.

a. ) Ventricular tachycardia
b. ) Ventricular fibrillation
c. ) Premature ventricular complex/contraction (PVC)

Answer 10

c.) Premature ventricular complex/contraction (PVC)

Caused by ventricular ectopic stimulus → distortion of QRS complex (wide, bizarre looking).

Ventricles are not sufficiently filled to eject blood, since depolarization is premature.

In absence of heart disease, may not be clinically significant; however, if frequent, predisposes to other more serious dysrhythmias.

Ventricular Dysrhythmias are generally more serious than those arising from atria related to an increased potential for interfering with pumping action of the heart.

ectopic = in an abnormal place or position

Question 11

Ventricular Dysrhythmias

Ventricular rate of 100-250 beats/min → decrease in diastolic filling time → decrease in cardiac output.

a. ) Ventricular tachycardia
b. ) Ventricular fibrillation
c. ) Premature ventricular complex/contraction (PVC)

Answer 11

a.) Ventricular tachycardia

Ventricular rate of 100-250 beats/min → decrease in diastolic filling time → decrease in cardiac output.

Ventricular Dysrhythmias are generally more serious than those arising from atria related to an increased potential for interfering with pumping action of the heart.

Question 12

Ventricular Dysrhythmias

Ventricles quiver, but do not contract → decrease in cardiac output → fatal unless successfully treated with defibrillation. EKG tracing is totally disorganized.

a. ) Ventricular tachycardia
b. ) Ventricular fibrillation
c. ) Premature ventricular complex/contraction (PVC)

Answer 12

b.) Ventricular fibrillation

Ventricles quiver, but do not contract → decrease in cardiac output → fatal unless successfully treated with defibrillation. EKG tracing is totally disorganized.

Ventricular Dysrhythmias are generally more serious than those arising from atria related to an increased potential for interfering with pumping action of the heart.