Heart Rhythms

Question 1

Rhythm is regular, with heart rate that is 50-120bpm. P wave is absent, the QRS if wide (>0.10sec)

Answer 1

Accelerated Idoventricular Rhythm

Question 2

Rhythm is highly irregular, with a heart rate that is unmeasurable. P wave is absent. The PR interval is not measurable. No QRS complex. EKG tracing is a wavy line.

Answer 2

Ventricular Fibrillation

Question 3

Rhythm is regular, with heart rate that is fast (> 100bpm). The P wave is normal (0.12-0.20sec). The QRS is typically normal (0.06-0.10sec). QT interval shortens with increasing heart rate

Answer 3

Sinus Tachycardia

Question 4

Rhythm is highly irregular, with heart rate that is unmeasurable. The P wave is absent. The PR interval is not measurable. The QRS is typically none. EKG tracings is a wavy line.

Answer 4

Ventricular Fibrillation

Question 5

Rhythm that may be irregular, with heart rate that is normal (60-100bpm). The P wave is changing shape and size beat to beat (at least three different forms). The PR interval is variable. The QRS is typically normal (0.06-0.10sec). T wave is normal.

Answer 5

Wandering Atrial Pacemaker

Question 6

Rhythm that is regular, with heart rate that is slow (40-60 bpm). Notice that the P wave is present before, during (hidden) or after QRS, if visible it is inverted. The PR interval is not measurable. The QRS is typically normal (0.06-0.10 sec).

Answer 6

Junctional Escape Rhythm

Question 7

How much time is a full EKG strip?

Answer 7

6 seconds

Question 8

How much time is a half of a EKG strip?

Answer 8

3 seconds

Question 9

How much time is one big square on an EKG strip?

Answer 9

0.2 seconds

Question 10

How many millivolts (mV) is one big square on an EKG strip?

Answer 10

0.5 mV

Question 11

• First deflection
• Normally positive (upward) waveform
• Indicates atrial depolarization
• Amplitude is normally 0.05 to 0.25mV (0.5 to 2.5 small boxes)
• Normal duration is 0.06-0.11seconds (1.5-2.75 small boxes)

Answer 11

P-Wave

Question 12

• Measure the interval from the beginning of the P-wave until the beginning of the QRS complex
• Normally this interval is 0.12 to 0.20 seconds (3 to 5 small boxes)

Answer 12

PR Interval

Question 13

• Follows the P-wave
• Normally begins with a downward deflection, then a large upward deflection, and then a final downward deflection
• Represents ventricular depolarization and contraction
• Interval (measure from the end of the PR interval to the end of the S-wave) is normally 0.06 to 0.12 seconds (1.5 to 3 boxes)

Answer 13

QRS Complex

Question 14

• Normally a modest upward waveform
• Represents ventricular repolarization
• Take note of those T-waves that have a downward deflection or a tall, pointed peak

Answer 14

T-Wave

Question 15

• Indicates the recovery of the Purkinje fibers

- May not be a observable waveform

Answer 15

U-Wave

Question 16

What is the interval that measures ventricular rhythm?

Answer 16

R to R Intervals

Question 17

What is the interval that measures atrial rhythm?

Answer 17

P to P Interval

Question 18

What is the interval that represents the time of ventricular activity including both depolarization and repolarization?

Answer 18

QT Interval

-0.36 to 0.44seconds (9-11 small boxes)

Question 19

What is the interval that represents the time of AV conduction?

Answer 19

PR Interval

-0.12 to 0.20 seconds (3-5 small boxes)

Question 20

What is the interval that represents the early part of ventricular repolarization?

Answer 20

ST Segment

Question 21

Irregular rhythms

Answer 21

• Sinus Arrhythmia
• Wandering Pacemaker
• Multifocal Atrial Tachycardia
• Atrial Fibrillation

Question 22

Escape Rhythm

Answer 22

• Atrial Escape Rhythm
• Junctional Escape Rhythm
• Ventricular Escape Rhythm

Question 23

Escape Beat

Answer 23

• Atrial Escape Beat
• Junctional Escape Beat
• Ventricular Escape Beat

Question 24

Premature Beats

Answer 24

• Premature Atrial Beat
• Premature Junctional Beat
• Premature Ventricular Beat