ECG rhythms

Question 1

Regularity: Regular
Rate: 60-100
P wave: Normal and upright:
One P -wave in front of each QRS
PRI: .12 -.20 seconds & constant
QRS 0.04 – 0.10 and constant

Answer 1

Normal Sinus Rhythm

Question 2

Rate: 101-150 bpm
P wave: Normal and upright:
One P -wave in front of each QRS
PRI: .12 -.20 seconds & constant
QRS 0.04 – 0.10 and constant

Answer 2

Sinus tachycardia

Question 3

Rate; <60
P wave: Normal and upright:
One P -wave in front of each QRS
PRI: .12 -.20 seconds & constant
QRS 0.04 – 0.10 and constant

Answer 3

Sinus bradycardia

Question 4

Regularity:	Irregular	
Rate:		60-100
P wave: Normal and upright, one in front of each QRS
PRI:	          .12 - .20 seconds
QRS		< .12 seconds

Answer 4

Sinus arrhythmia

Question 5

Regularity:	Regular	
Rate:	150-250
P wave:  Abnormal: coming from different foci in heart
PRI: 	.12-.20 seconds
QRS:       < .12 seconds

Answer 5

Atrial tachycardia

Question 6

Regularity:	Can be regular or irregular
Rate:	250-350 bpm (of atrium)
P wave:	“Saw Tooth” appearance
PRI:               Not measurable
QRS:              Normal

Answer 6

Atrial flutter

Question 7

Regularity:	Irregularly, irregular
Rate:	>350
P wave:	Not measurable
PRI:	             Not Measurable
QRS: 	Normal

Answer 7

Atrial fibrillation

Question 8

Regularity: Regular
Rate: 40-60 bpm
P wave: Inverted (in Lead II) before, during, or after QRS
PRI: Measurable only if before the QRS, then < 0.12

Answer 8

Junctional rhythm

Question 9

Regularity: Regular
Rate: 61-100 bpm
P wave: Inverted (in Lead II) before, during, or after QRS
PRI: Measurable only if before the QRS, then 0.12

Answer 9

Accelerated junctional rhythm

Question 10

Regularity: Regular
Rate: 101-180 bpm
P wave: Inverted (in Lead II) before, during, or after QRS
PRI: Measurable only if before the QRS, then < 0.12

Answer 10

Junctional tachycardia

Question 11

Regularity: Usually irregular because of PJC
Rate: Depends on the underlying rhythm
P wave: Inverted before, during, or after QRS
PRI: Measurable only if before the QRS, then < 0.12

Answer 11

Premature junctional contractions

Question 12

a broad term for a group of rhythms originating above the ventricle

Sinus tachycardia
Atrial tachycardia
Atrial flutter
Atrial fibrillation
Junctional tachycardia
Rate: 100-280 with a mean of 170 bpm in adults

Answer 12

Supraventricular tachycardia (SVT)

Question 13

Regularity: Irregular
Rate: Depends on underlying rhythm
P wave: PVC does not have P wave
PRI: PVC (no PRI); Underlying rhythm (PRI Normal)
QRS: PVC wide bizarre, others normal

Answer 13

Premature ventricular contraction

Question 14

Regularity:	Usually regular
Rate:		140-180 bpm (or more) 
P wave:	None
PRI:		None
QRS:	 	Wide bizarre, >.12 sec

Answer 14

Ventricular tachycardia

Question 15

Regularity:	Usually regular
Rate:		20-40 bpm
P wave:		None
PRI:		None
QRS:		Wide bizarre, >.12 sec

Answer 15

Idioventricular rhythm

Question 16

Delay at AV node. Each atrial impulse is eventually conducted through ventricle.
PRI > .20 seconds; constant

Answer 16

First degree heart block

Question 17

Regularity: Irregular in a pattern of grouped beating
Rate: Usually slightly slower than normal
P wave: Upright and uniform: some P waves are not followed by QRS
PRI: Progressively lengthens until one P wave is blocked
QRS:

Answer 17

Type I second degree heart block (Wenckebach) (Mobitz I)

Question 18

Regularity: P-P interval is regular, R-R interval can be regular or irregular
Rate: Usually in the bradycardia range
P wave: Upright and uniform, more than one P wave for each QRS
PRI: Always constant, can be greater than .20
QRS: < 0.12 seconds

Answer 18

Type II second degree heart block (Mobitz II)

Question 19

Regularity: Irregular but can be regular
Rate: Atrial rate usually normal (60-100)
Ventricular rate 40-60 if focus junctional
20-40 if focus is ventricular
P wave: Upright and uniform; more P waves than QRS complexes
PRI: No relationship between P waves and QRS
QRS: < 0.12 seconds if focus junctional, > 0.12 if ventricular

Answer 19

Complete heart block/third degree