Deck 3: Sinus Mechanisms

Question 1

An ECG rhythm strip shows a ventricular rate of 128 bpm,a regular rhythm,a PR interval of 0.16 seconds,a QRS duration of 0.08 seconds,and one upright P wave before each QRS.This rhythm is sinus _____.

A) arrhythmia
B) bradycardia
C) rhythm
D) tachycardia

Answer 1

D
The rhythm described fits the ECG criteria for a sinus tachycardia.

Question 2

Identify the following rhythm (lead II): ____________________

Answer 2

Sinus rhythm at 65 beats/min

Question 3

Which of the following are possible causes of sinus tachycardia?

A) Hypothermia,hypovolemia
B) Hypoxia,calcium channel blocker overdose
C) Fever,pain,anxiety
D) Vomiting,vagal maneuvers

Answer 3

C
Causes of sinus tachycardia include: acute myocardial infarction; caffeine-containing beverages; dehydration,hypovolemia; drugs such as cocaine,amphetamines,ecstasy,cannabis; exercise; fear and anxiety; fever; heart failure; hyperthyroidism; hypoxia; infection; medications such as epinephrine,atropine,and dopamine; nicotine; pain; pulmonary embolism; shock; sympathetic stimulation.

Question 4

An ECG rhythm strip shows a ventricular rate of 46 bpm,a regular rhythm,a PR interval of 0.14 seconds,a QRS duration of 0.06 seconds,and one upright P wave before each QRS.This rhythm is _____.

A) sinus rhythm
B) sinus bradycardia
C) sinus arrest
D) sinoatrial block

Question 5

The rate of a sinus bradycardia is _____ beats/min.

A) slower than 60
B) 60 to 100
C) 80 to 120
D) faster than 100

Question 6

Identify the following rhythm (lead II): ____________________

Question 7

Which of the following are possible causes of sinus bradycardia?

A) Elevated temperature,pain
B) Increased intracranial pressure,beta-blocker overdose
C) Hypoxia,fright,caffeine-containing beverages
D) Hypovolemia,administration of sympathomimetics

Question 8

Identify the following rhythm (lead II): ____________________

Question 9

Identify the following rhythm: ____________________

Question 10

Management of a patient with a sinus tachycardia might include _____.

A) identification and treatment of the underlying cause
B) administration of atropine
C) use of a pacemaker
D) vagal maneuvers,such as carotid sinus pressure

Question 11

Identify the following rhythm (lead II): ____________________

Question 12

Identify the following rhythm (lead II): ____________________

Question 13

The rate of sinus tachycardia is _____ beats/min.

A) slower than 60
B) 40 to 80
C) 60 to 100
D) faster than 100

Question 14

Which of the following correctly reflects the ECG criteria for a sinus rhythm?

A) More P waves than QRS complexes
B) P waves that look alike and upright in lead II,one before each QRS complex
C) Irregular atrial and ventricular rhythm
D) PR interval exceeding 0.20 seconds

Question 15

Identify the following rhythm (lead II): ____________________

Question 16

The rate of a sinus rhythm is ____ beats/min.

A) slower than 60
B) 60 to 100
C) 80 to 120
D) faster than 100

Question 17

Identify the following rhythm (lead II): ____________________

Question 18

Identify the following rhythm (lead II): ____________________

Question 19

Which of the following may cause a sinus bradycardia?

A) Stress or anxiety
B) Increased sympathetic tone
C) Fever
D) Hypothermia

Question 20

In sinus arrhythmia,a gradual increasing of the heart rate is usually associated with _____.

A) expiration
B) inspiration
C) excessive caffeine intake
D) early signs of heart failure

Question 21

Identify the following rhythm (lead II): ____________________

Question 22

Identify the following rhythm (lead II): ____________________

Question 23

Identify the following rhythm: ____________________

Question 24

Complete the following ECG criteria for a sinus rhythm:

Question 25

Identify the following rhythm (lead I): ____________________

Question 26

Identify the following rhythm (lead II): ____________________

Question 27

List three significant signs and/or symptoms that,if observed with a sinus bradycardia,would require management of this dysrhythmia.

Question 28

Identify the following rhythm (lead II): ____________________

Question 29

Identify the following rhythm (lead II): ____________________

Question 30

Identify the following rhythm (lead II): ____________________

Question 31

Identify the following rhythm (lead II): ____________________

Question 32

Identify the following rhythm (lead II): ____________________

Question 33

Identify the following rhythm (lead II): ____________________

Question 34

Identify the following rhythm (lead II): ____________________

Question 35

Identify the following rhythm (lead II): ____________________

Question 36

Identify the following rhythm (lead II): ____________________

Question 37

Identify the following rhythm (lead II): ____________________

Question 38

Identify the following rhythm (lead II): ____________________

Question 39

Identify the following rhythm (lead II): ____________________

Question 40

Identify the following rhythm (lead II): ____________________

Question 41

Complete the following ECG criteria for a sinus arrest:

Question 42

Complete the following ECG criteria for a sinus bradycardia:

Question 43

Complete the following ECG criteria for a sinus arrhythmia:

Question 44

Complete the following ECG criteria for a sinoatrial (SA)block:

Question 45

Complete the following ECG criteria for a sinus tachycardia: