Question 1

If a rhythm is IRREGULAR,the best way to determine rate is to:

Accepted Answer

A) count the number of QRS complexes in a 6-sec strip and multiply by 10. 
B) count the number of large squares between two R waves and divide that into 300. 
C) count the number of small squares between two R waves and divide that into 1500. 
D) use a rate meter. A

Question 2

A Normal Sinus Rhythm should have a QRS of less than ________ sec.

Accepted Answer

A) 0.12 
B) 0.18 
C) 0.20 
D) 0.22 A

Question 3

When a P wave originates in the SA node,it is expected to be smooth,rounded,and ________ in Lead II.

Accepted Answer

A) inverted 
B) upright 
C) notched 
D) biphasic B

Question 4

Which of the following best describes a "lost" P wave?

Accepted Answer

A) One that can't be counted because it happens too quickly. 
B) One that is visible but highly irregular. 
C) One that is obscured because it falls on other waves. 
D) One that is there one minute but gone the next.

Question 5

A major EKG finding that can help you distinguish between supraventricular and ventricular rhythms is the width of the:

Accepted Answer

A) QRS complex. 
B) P-P interval. 
C) T wave. 
D) P wave.

Question 6

A rhythm that is "regularly irregular" would describe a rhythm that:

Accepted Answer

A) is chaotic in its irregularity. 
B) has a pattern to its irregularity. 
C) is irregular sometimes but not others. 
D) is consistently irregular every time you see it.

Question 7

To find out if a rhythm is regular or irregular,measure the ________ across the entire strip.

Accepted Answer

A) R-R intervals 
B) QRS complexes 
C) PR intervals 
D) PR segments

Question 8

The QRS complex is indicative of ventricular ________ and thus should correspond to the patient's pulse.

Accepted Answer

A) failure 
B) recovery 
C) irritability 
D) depolarization

Question 9

The P waves are the first waves you should look for when analyzing a rhythm strip because:

Accepted Answer

A) they are the biggest and thus most visible. 
B) they are usually very regular and thus easy to find. 
C) they always have a constant relationship with the waves around them. 
D) they are the most important for diagnosing heart disease.

Question 10

The heart's normal rhythm usually originates in the:

Accepted Answer

A) SA node. 
B) atria. 
C) AV node. 
D) ventricle.

Question 11

If a rhythm is regular,the MOST accurate way to calculate heart rate is to count the number of small squares between two R waves and divide the total into:

Accepted Answer

A) 60. 
B) 150. 
C) 1300. 
D) 1500.

Question 12

The standard systematic approach to arrhythmia interpretation consists of all of the following EXCEPT:

Accepted Answer

A) heart rate and regularity. 
B) P waves and PR interval. 
C) QRS complex. 
D) refractory periods.

Question 13

Which part of the conduction system has the slowest conduction speed,and is thus responsible for slowing down impulses until the heart is ready to receive them?

Accepted Answer

A) SA node 
B) Atria 
C) AV node 
D) Ventricles

Question 14

P waves usually appear before:

Accepted Answer

A) upright waves. 
B) QRS complexes. 
C) PR intervals. 
D) T waves.

Question 15

The cardiac activity that takes place above the ventricles is referred to as ________ activity.

Accepted Answer

A) precipitating 
B) AV nodal 
C) supraventricular 
D) infraventricular

Question 16

If a QRS complex measures less than 0.12 sec,you know that it did NOT originate in the:

Accepted Answer

A) SA node. 
B) atria. 
C) AV junction. 
D) ventricles.

Question 17

Which of the following is the LEAST accurate way to determine heart rate?

Accepted Answer

A) Count the number of QRS complexes in a 6-sec strip and multiply by 10. 
B) Count the number of large squares between two R waves and divide that into 300. 
C) Count the number of small squares between two R waves and divide that into 1500. 
D) Use a rate meter.

Exam 3: Analyzing Ekg Rhythm Strips