EKG Exam 2- S/A/J
Strips
1. What is the name given to a normal heart rhythm?: Sinus rhythm
2. Dysrhythmia originating in the SA node that occurs when the SA node discharges irregularly; this is a normal
phenomenon associated with the phases of breathing and changes in intrathoracic pressure: Sinus arrhythmia
3. Dysrhythmia originating in the SA node with a ventricular response of less than 60 bpm: Sinus Bradycardia
4. Dysrhythmia originating in the SA node with a ventricular rate faster than 100 bpm with a maximum rate about 220
bpm: Sinus Tachycardia
5. (this is an old question but good to remember bc a lot of people missed it) What is the order of the electrical
conduction system?: 1. SA node
2. Interatrial and nodal tracts
3. AV node
4. Bundle of His
5. Right and Left BB
6. Purkinje fibers
6. The normal heart beat results from an electrical impulse that starts in the: SA node
7. A rhythm that begins in the SA node has the following characteristics: 1. Positive P wave before each QRS
complex
2. P waves that look alike
3. A constant PR interval
4. A regular atrial and ventricular rhythm (usually)
8. An electrical impulse that begins in the SA node may be affected by the following:: 1. medications
2. diseases or conditions that cause the heart rate to speed up, slow down, or beat irregularly
3. diseases or conditions that delay or block the impulse from leaving the SA node
4. diseases or conditions that prevent an impulse from being generated in the SA node
9. If we are measuring the R-R intervals, this gives us the: ventricular rate
10.If we are measuring the P-P intervals, this gives us the: atrial rate
11.What are the EKG characteristics of a sinus rhythm?: Rhythm: R-R and P-P intervals are regular
Rate: 60 to 100 bpm
P waves: Positive (upright) in lead II; one precedes each QRS complex; P waves look alike
PR interval: 0.12-0.20 sec and constant from beat to beat QRS duration: 0.11 sec or
less unless abnormally conducted
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, EKG Exam 2- S/A/J
Strips
12.What are the EKG characteristics of sinus bradycardia?: Rhythm: R-R and P-P intervals are regular
Rate: Less than 60 bpm
P waves: Positive (upright) in lead II; one precedes each QRS complex; P waves look alike
PR interval: 0.12-0.20 sec and constant from beat to beat QRS duration: 0.11 sec or
less unless abnormally conducted
13.What are the EKG characteristics of sinus tachycardia?: Rhythm: R-R and P-P intervals are regular
Rate: Ventricular rate faster than 100 bpm w the maximum rate about 220 bpm P waves: Positive (upright) in
lead II; one precedes each QRS complex; P waves look alike
PR interval: 0.12-0.20 sec and constant from beat to beat QRS duration: 0.11 sec or
less unless abnormally conducted
14.When the SA node fires irregularly, the resulting rhythm is called: Sinus Arrhythmia
15.Sinus arrhythmia associated with the phases of breathing and intratho- racic pressure is called: respiratory
sinus arrhythmia
16.What are the EKG characteristics of sinus arrhythmia?: Rhythm: Irregular and often phasic with breathing;
heart rate increases gradually during inspiration (R-R intervals shorten) and decreases with expiration (R-R
intervals lengthen) Rate: Usually 60 to 100 bpm
P waves: Positive (upright) in lead II; one precedes each QRS complex; P waves look alike
PR interval: 0.12-0.20 sec and constant from beat to beat QRS duration: 0.11 sec or
less unless abnormally conducted
17.What may SA block be called also?: Sinus Exit Block
18.When the SA nodes pacemaker cells initiate an impulse, but it is blocked as it exits the SA node which results in
periodically absent PQRS complexes, this is called an: SA block
19.Why is SA block thought to occur?: Because of the failure of the transitional cells in the SA node to conduct an
impulse from the pacemaker cells to the surrounding atrium.
20.SA block is a disorder of: impulse conduction
21.In SA block, when an impulse is blocked as it exits the SA node, the atria are not activated therefore the lack of atrial
activation appears on the ECG as a: single missed beat/ one cardiac cycle
22.What are the EKG characteristics of SA block?: Rhythm: Irregular because of the pause caused by the SA block-
the pause is the same as, or an exact multiple
2/
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Strips
1. What is the name given to a normal heart rhythm?: Sinus rhythm
2. Dysrhythmia originating in the SA node that occurs when the SA node discharges irregularly; this is a normal
phenomenon associated with the phases of breathing and changes in intrathoracic pressure: Sinus arrhythmia
3. Dysrhythmia originating in the SA node with a ventricular response of less than 60 bpm: Sinus Bradycardia
4. Dysrhythmia originating in the SA node with a ventricular rate faster than 100 bpm with a maximum rate about 220
bpm: Sinus Tachycardia
5. (this is an old question but good to remember bc a lot of people missed it) What is the order of the electrical
conduction system?: 1. SA node
2. Interatrial and nodal tracts
3. AV node
4. Bundle of His
5. Right and Left BB
6. Purkinje fibers
6. The normal heart beat results from an electrical impulse that starts in the: SA node
7. A rhythm that begins in the SA node has the following characteristics: 1. Positive P wave before each QRS
complex
2. P waves that look alike
3. A constant PR interval
4. A regular atrial and ventricular rhythm (usually)
8. An electrical impulse that begins in the SA node may be affected by the following:: 1. medications
2. diseases or conditions that cause the heart rate to speed up, slow down, or beat irregularly
3. diseases or conditions that delay or block the impulse from leaving the SA node
4. diseases or conditions that prevent an impulse from being generated in the SA node
9. If we are measuring the R-R intervals, this gives us the: ventricular rate
10.If we are measuring the P-P intervals, this gives us the: atrial rate
11.What are the EKG characteristics of a sinus rhythm?: Rhythm: R-R and P-P intervals are regular
Rate: 60 to 100 bpm
P waves: Positive (upright) in lead II; one precedes each QRS complex; P waves look alike
PR interval: 0.12-0.20 sec and constant from beat to beat QRS duration: 0.11 sec or
less unless abnormally conducted
1/
9
, EKG Exam 2- S/A/J
Strips
12.What are the EKG characteristics of sinus bradycardia?: Rhythm: R-R and P-P intervals are regular
Rate: Less than 60 bpm
P waves: Positive (upright) in lead II; one precedes each QRS complex; P waves look alike
PR interval: 0.12-0.20 sec and constant from beat to beat QRS duration: 0.11 sec or
less unless abnormally conducted
13.What are the EKG characteristics of sinus tachycardia?: Rhythm: R-R and P-P intervals are regular
Rate: Ventricular rate faster than 100 bpm w the maximum rate about 220 bpm P waves: Positive (upright) in
lead II; one precedes each QRS complex; P waves look alike
PR interval: 0.12-0.20 sec and constant from beat to beat QRS duration: 0.11 sec or
less unless abnormally conducted
14.When the SA node fires irregularly, the resulting rhythm is called: Sinus Arrhythmia
15.Sinus arrhythmia associated with the phases of breathing and intratho- racic pressure is called: respiratory
sinus arrhythmia
16.What are the EKG characteristics of sinus arrhythmia?: Rhythm: Irregular and often phasic with breathing;
heart rate increases gradually during inspiration (R-R intervals shorten) and decreases with expiration (R-R
intervals lengthen) Rate: Usually 60 to 100 bpm
P waves: Positive (upright) in lead II; one precedes each QRS complex; P waves look alike
PR interval: 0.12-0.20 sec and constant from beat to beat QRS duration: 0.11 sec or
less unless abnormally conducted
17.What may SA block be called also?: Sinus Exit Block
18.When the SA nodes pacemaker cells initiate an impulse, but it is blocked as it exits the SA node which results in
periodically absent PQRS complexes, this is called an: SA block
19.Why is SA block thought to occur?: Because of the failure of the transitional cells in the SA node to conduct an
impulse from the pacemaker cells to the surrounding atrium.
20.SA block is a disorder of: impulse conduction
21.In SA block, when an impulse is blocked as it exits the SA node, the atria are not activated therefore the lack of atrial
activation appears on the ECG as a: single missed beat/ one cardiac cycle
22.What are the EKG characteristics of SA block?: Rhythm: Irregular because of the pause caused by the SA block-
the pause is the same as, or an exact multiple
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