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Basic EKG > Chapter 7 > Flashcards

Chapter 7 Flashcards

1
Q

t or f The ventricular rhythm is regular in second-degree AV block type I.

A

false

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2
Q

t or f…The QRS complex associated with a third-degree AV block is always wide

A

false

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3
Q

In 2:1 AV block, the PR interval _____.a. Shortens

b. Lengthens
c. is absent
d. remains constant

A

d. remains constant

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4
Q

The PR interval of a first-degree AV block _____.

a. is constant and less than 0.12 seconds in duration
b. is constant and more than 0.20 seconds in duration
c. is generally progressive until a P wave appears without a QRS complex
d. gradually decreases in duration until a P wave appears without a QRS complex

ANS: B

A

b. is constant and more than 0.20 seconds in duration

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5
Q

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 seconds. This rhythm is _____.

a. 2:1 AV block
b. third-degree AV block
c. second-degree AV block type I
d. second-degree AV block type II

ANS: B

A

b. third-degree AV block

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6
Q

A 2:1 AV block is characterized by _____ intervals.

a. irregular P to P
b. irregular R to R
c. regular P to P intervals and regular R to R
d. irregular P to P intervals and regular R to R

A

c. regular P to P intervals and regular R to R

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7
Q

Second-degree AV block type II is characterized by _____ intervals.

a. irregular P to P
b. irregular R to R
c. regular P to P intervals and regular R to R
d. irregular P to P intervals and irregular R to R

ANS: B

A

b. irregular R to R

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8
Q
  1. Second-degree AV block type I is characterized by _____ intervals.
    a. irregular P to P
    b. regular R to R
    c. regular P to P intervals and irregular R to R
    d. irregular P to P intervals and irregular R to R

ANS: C

A

c. regular P to P intervals and irregular R to R

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9
Q

In second-degree and third-degree AV blocks, _____.

a. P waves occur regularly
b. every other P wave is dropped
c. P waves are periodically dropped
d. there are more QRS complexes than P waves

ANS: A

A

a. P waves occur regularly

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10
Q

In second-degree AV block type I, the PR interval _____.

a. shortens
b. is absent
c. is inconstant
d. remains constant

ANS: C

A

c. is inconstant

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11
Q

In 2:1 AV block, _____.

a. the atrial rhythm (P-P interval) is regular
b. the ventricular rhythm (R-R interval) is irregular
c. the PR interval lengthens until a P wave appears with no QRS complex
d. there is no PR interval because the atria and ventricles beat independently of each other

ANS: A

A

a. the atrial rhythm (P-P interval) is regular

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12
Q

Most of the bundle branch tissue is supplied by the _____ coronary artery.

a. right
b. left

A

b. left

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13
Q

Indicate the ECG criteria for the following dysrhythmias:
Third-Degree AV Block 2:1 AV Block
Ventricular
Rhythm ____________________ _____________________
PR interval ____________________ _____________________
QRS width ____________________ _____________________

ANS:	
	Third-Degree AV Block	2:1 AV Block 
Ventricular		
Rhythm	Regular	Regular
PR interval	None	Constant
QRS width	Narrow or wide	Narrow or wide
A

x

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14
Q

Complete the following ECG criteria for 2:1 AV block:
Rhythm ________________________________________
Rate ________________________________________
P waves ________________________________________
PR interval ________________________________________
QRS duration ________________________________________

ANS:
Rhythm Ventricular regular; atrial regular (Ps plot through on time).
Rate Atrial rate is twice the ventricular rate.
P waves Normal in size and shape; every other P wave is not followed by a QRS complex (i.e., more Ps than QRSs).
PR interval Constant.
QRS duration May be narrow or wide; complexes are absent after every other P wave.

A

x

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15
Q
  1. Complete the following ECG criteria for third-degree AV block:
    Rhythm ________________________________________
    Rate ________________________________________
    P waves ________________________________________
    PR interval ________________________________________
    QRS duration ________________________________________

ANS:
Rhythm Ventricular regular; atrial regular (Ps plot through); no relationship between the atrial and ventricular rhythms (i.e., AV dissociation is present).
Rate The ventricular rate is determined by the origin of the escape rhythm; the atrial rate is greater than (and independent of) the ventricular rate; ventricular rate is determined by the origin of the escape rhythm.
P waves Normal in size and shape; some P waves are not followed by a QRS complex (i.e., more Ps than QRSs).
PR interval None. The atria and the ventricles beat independently of each other; therefore there is no true PR interval.
QRS duration Narrow or wide, depending on the location of the escape pacemaker and the condition of the intraventricular conduction system.

A

x

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16
Q

Complete the following ECG criteria for second-degree AV block type II:
Rhythm ________________________________________
Rate ________________________________________
P waves ________________________________________
PR interval ________________________________________
QRS duration ________________________________________

ANS:
Rhythm Ventricular irregular; atrial regular (i.e., Ps plot through on time).
Rate Atrial rate is greater than the ventricular rate; ventricular rate is often slow.
P waves Normal in size and shape; some P waves are not followed by a QRS complex (i.e., more Ps than QRSs).
PR interval Within normal limits or prolonged but constant for the conducted beats; the PR intervals before and after a blocked P wave are constant.
QRS duration Within normal limits if the block occurs above or within the bundle of His; greater than 0.11 seconds if the block occurs below the bundle of His; complexes are periodically absent after P waves.

A

x

17
Q

Complete the following ECG criteria for second-degree AV block type II:
Rhythm ________________________________________
Rate ________________________________________
P waves ________________________________________
PR interval ________________________________________
QRS duration ________________________________________

ANS:
Rhythm Ventricular irregular; atrial regular (i.e., Ps plot through on time).
Rate Atrial rate is greater than the ventricular rate; ventricular rate is often slow.
P waves Normal in size and shape; some P waves are not followed by a QRS complex (i.e., more Ps than QRSs).
PR interval Within normal limits or prolonged but constant for the conducted beats; the PR intervals before and after a blocked P wave are constant.
QRS duration Within normal limits if the block occurs above or within the bundle of His; greater than 0.11 seconds if the block occurs below the bundle of His; complexes are periodically absent after P waves.

A

x

18
Q

Complete the following ECG criteria for second-degree AV block type I:
Rhythm ________________________________________
Rate ________________________________________
P waves ________________________________________
PR interval ________________________________________
QRS duration ________________________________________

ANS:
Rhythm Ventricular irregular; atrial regular (i.e., Ps plot through on time); grouped beating may be present.
Rate Atrial rate is greater than the ventricular rate.
P waves Normal in size and shape; some P waves are not followed by a QRS complex (i.e., more Ps than QRSs).
PR interval Inconstant; the PRI after a nonconducted P wave is shorter than the interval preceding the nonconducted beat.
QRS duration Usually 0.11 seconds or less; complexes periodically dropped.

A

x

19
Q

Complete the following ECG criteria for first-degree AV block:
Rhythm ________________________________________
Rate ________________________________________
P waves ________________________________________
PR interval ________________________________________
QRS duration ________________________________________

ANS:
Rhythm Regular.
Rate Usually within normal range, but depends on underlying rhythm.
P waves Normal in size and shape; one positive (upright) P wave before each QRS.
PR interval Prolonged (i.e., more than 0.20 seconds) but constant.
QRS duration Usually 0.11 seconds or less unless abnormally conducted.

A

x

20
Q

In second-degree and third-degree AV blocks, _____.

a. P waves occur regularly
b. every other P wave is dropped
c. P waves are periodically dropped
d. there are more QRS complexes than P waves

ANS: A

A

a. P waves occur regularly

21
Q

In third-degree AV block, _____.

a. the atrial rhythm (P-P interval) is irregular
b. the ventricular rhythm (R-R interval) is irregular
c. there is no PR interval because the atria and ventricles beat independently of each other
d. the PR interval after a nonconducted P wave is shorter than the interval preceding the nonconducted beat

ANS: C

A

c. there is no PR interval because the atria and ventricles beat independently of each other

Basic EKG (9 decks)

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