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ECG Rules and Such
I just said... ECG Rules and Such
22
Nursing
Undergraduate 4
10/21/2012

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Cards

Term

 

  

Normal Sinus Rhythm

 

 

R/R, P Wave, PR Interval, QRS Complex

Definition

 

Rate and Rhythm = 60-100/Regular

 

P Wave = Normal

 

PR Interval = Normal

 

QRS Complex = Normal

Term

 

  

 Sinus Bradycardia

 

 

R/R, P Wave, PR Interval, QRS Complex

Definition

 

Rate and Rhythm = <60 bpm/Regular

 

P Wave = Normal

 

PR Interval = Normal

 

QRS Complex = Normal

Term

 

  

Sinus Tachycardia

 

 

R/R, P Wave, PR Interval, QRS Complex

Definition

 

Rate and Rhythm = 101-200 bpm/Regular

 

P Wave = Normal

 

PR Interval = Normal

 

QRS Complex = Normal

Term

 

  

Premature Atrial Contractions

 

 

R/R, P Wave, PR Interval, QRS Complex

Definition

 

Rate and Rhythm = Usually 60-100 bpm/Irregular

 

P Wave = Abnormal Shape

 

PR Interval = Normal

 

QRS Complex = Normal (Usually)

Term

 

 

Paroxysmal Supraventricular Tachycardia

 

 

R/R, P Wave, PR Interval, QRS Complex

Definition

 

Rate and Rhythm = 150-220/Regular

 

P Wave = Abnormal shape, may be hidden in the preceding T Wave

 

PR Interval = Normal or shortened

 

QRS Interval = Normal (Usually)

Term

 

 

Atrial Flutter

 

 

R/R, P Wave, PR Interval, QRS Complex

Definition

Rate and Rhythm = Atrial: 200-350 bpm/Regular Ventricular: > or <100 bpm/Regular or Irregular

 

P Wave = Flutter waves (sawtooth pattern) more flutter waves than QRS complexes, i.e. 2:1, 3:1, 4:1 patterns

 

PR Interval = Not Measurable

 

QRS Complex = Normal (Usually)

Term

 

 

  Atrial Fibrillation

 

 

R/R, P Wave, PR Interval, QRS Complex

Definition

 

Rate and Rhythm = Atrial: 350-600 bpm/Irregular Ventricular: > or <100 bpm/Irregular

 

P Wave = Fibrillatory Waves

 

PR Interval = Not Measurable

 

QRS Complex = Normal (Usually)

Term

 

 

Junctional Dysrhythmias

 

 

R/R, P Wave, PR Interval, QRS Complex

Definition

 

Rate and Rhythm = 40-180 bpm/Regular

 

P Wave = Inverted, may be hidden in QRS complex

 

PR Interval = Variable

 

QRS Complex = Normal (Usually)

Term

 

 

First Degree AV Bock

 

 

R/R, P Wave, PR Interval, QRS Complex

Definition

 

Rate and Rhythm = Normal and regular

 

P Wave = Normal

 

PR Interval = >0.20 seconds

 

QRS Complex = Normal

Term

 

 

Second Degree AV Block (Type I/Mobitz I/Wenckebach)

 

 

R/R, P Wave, PR Interval, QRS Complex

Definition

Rate and Rhythm = Atrial: Normal and Regular Ventricular: Slower and Irregular

 

P wave = Normal

 

PR Interval = Progressively lengthening

 

QRS Complex = Normal QRS width, with pattern of one nonconducted (Blocked) QRS complex

Term

 

 

Second Degree AV Block (Mobitz II) 

 

 

R/R, P Wave, PR Interval, QRS Complex

Definition

Rate and Rhythm = Atrial: Usually normal and regular Ventricular: Slower and regular or irregular

 

P Wave = More P waves than QRS complexes, e.g. 2:1 3:1

 

PR Interval = Normal or Prolonged

 

QRS Complex = Widened QRS, preceded by two or more P waves, with nonconducted (blocked) QRS Complexes

Term

 

 

Third Degree AV Block

(Complete Heart Block)

 

R/R, P Wave, PR Interval, QRS Complex

Definition

Rate and Rhythm = Atrial: Regular, but may appear irregular due to P waves hidden in QRS complexes Ventricular: 20-60 bpm and Regular

 

P Wave = Normal, but no connection with QRS Complex

 

PR Interval = Variable

 

QRS Complex = Normal or widened, no relationship with P waves

Term

 

 

Premature Ventricular Contractions

 

 

R/R, P Wave, PR Interval, QRS Complex

Definition

 

Rate and Rhythm = Underlying rhythm can be any rate; regular or irregular rhythm; PVCs occur at variable rates

 

P Wave = Not usually visible; hidden in the PVC

 

PR Interval = Not measurable

 

QRS Complex = Wide and distorted

Term

 

 

Ventricular Tachycardia

 

 

R/R, P Wave, PR Interval, QRS Complex

Definition

 

Rate and Rhythm = 150-250 bpm and regular/irregular

 

P Wave = Not usually visible

 

PR Interval = Not measurable

 

QRS Complex = Wide and distorted

Term

 

 

Accelerated Idioventricular Rhythm

 

 

R/R, P Wave, PR Interval, QRS Complex

Definition

 

Rate and Rhythm = 40-100 bpm/Regular

 

P Wave = Not usually Visible

 

PR Interval = Not measurable

 

QRS Complex = Wide and Distorted

Term

 

 

Ventricular Fibrillation

 

 

R/R, P Wave, PR Interval, QRS Complex

Definition

 

Rate and Rhythm = Not measurable and Irregular

 

P Wave = Absent

 

PR Interval = Not measurable

 

QRS Complex = Not measurable

Term

 

P Wave

 

Normal Duration

 

Source of possible variation

Definition

 

 

0.06-0.12

 

Disturbance in conduction within atria

Term

 

PR Interval

 

Normal Duration

 

Source of Possible Variation

Definition

 

0.12-0.20

 

Disturbances in conduction usually in AV node, bundle of His, or bundle branches but can be in atria as well

Term

 

QRS Complex

 

Normal Duration

 

Source of Possible Variation

Definition

 

<0.12 (0.06-0.12)

 

Disturbance in conduction in bundle branches or in ventricles

Term

 

ST Segment

 

Normal Duration

 

Source of Possible Variation

Definition

 

0.12

 

Disturbances usually caused by ischemia, injury, or infarction

Term

 

T Wave

 

Normal Duration

 

Source of Possible Variation

Definition

 

0.16

 

Disturbances usually caused by electrolyte imbalances, ischemia, or infarction

Term

 

QT Interval

 

Normal Duration

 

Source of Possible Duration

Definition

 

0.34-0.43 (0.40)

 

Disturbances usually affecting repolarization more than depolarization and caused by drugs, electrolyte imbalances, and changes in heart rate

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