Term
Normal Sinus Rhythm
R/R, P Wave, PR Interval, QRS Complex |
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Definition
Rate and Rhythm = 60-100/Regular
P Wave = Normal
PR Interval = Normal
QRS Complex = Normal |
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Term
Sinus Bradycardia
R/R, P Wave, PR Interval, QRS Complex |
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Definition
Rate and Rhythm = <60 bpm/Regular
P Wave = Normal
PR Interval = Normal
QRS Complex = Normal |
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Term
Sinus Tachycardia
R/R, P Wave, PR Interval, QRS Complex |
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Definition
Rate and Rhythm = 101-200 bpm/Regular
P Wave = Normal
PR Interval = Normal
QRS Complex = Normal |
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Term
Premature Atrial Contractions
R/R, P Wave, PR Interval, QRS Complex |
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Definition
Rate and Rhythm = Usually 60-100 bpm/Irregular
P Wave = Abnormal Shape
PR Interval = Normal
QRS Complex = Normal (Usually) |
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Term
Paroxysmal Supraventricular Tachycardia
R/R, P Wave, PR Interval, QRS Complex |
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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) |
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Term
Atrial Flutter
R/R, P Wave, PR Interval, QRS Complex |
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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) |
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Term
Atrial Fibrillation
R/R, P Wave, PR Interval, QRS Complex |
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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) |
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Term
Junctional Dysrhythmias
R/R, P Wave, PR Interval, QRS Complex |
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Definition
Rate and Rhythm = 40-180 bpm/Regular
P Wave = Inverted, may be hidden in QRS complex
PR Interval = Variable
QRS Complex = Normal (Usually) |
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Term
First Degree AV Bock
R/R, P Wave, PR Interval, QRS Complex |
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Definition
Rate and Rhythm = Normal and regular
P Wave = Normal
PR Interval = >0.20 seconds
QRS Complex = Normal |
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Term
Second Degree AV Block (Type I/Mobitz I/Wenckebach)
R/R, P Wave, PR Interval, QRS Complex |
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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 |
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Term
Second Degree AV Block (Mobitz II)
R/R, P Wave, PR Interval, QRS Complex |
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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 |
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Term
Third Degree AV Block
(Complete Heart Block)
R/R, P Wave, PR Interval, QRS Complex |
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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 |
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Term
Premature Ventricular Contractions
R/R, P Wave, PR Interval, QRS Complex |
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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 |
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Term
Ventricular Tachycardia
R/R, P Wave, PR Interval, QRS Complex |
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Definition
Rate and Rhythm = 150-250 bpm and regular/irregular
P Wave = Not usually visible
PR Interval = Not measurable
QRS Complex = Wide and distorted |
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Term
Accelerated Idioventricular Rhythm
R/R, P Wave, PR Interval, QRS Complex |
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Definition
Rate and Rhythm = 40-100 bpm/Regular
P Wave = Not usually Visible
PR Interval = Not measurable
QRS Complex = Wide and Distorted |
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Term
Ventricular Fibrillation
R/R, P Wave, PR Interval, QRS Complex |
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Definition
Rate and Rhythm = Not measurable and Irregular
P Wave = Absent
PR Interval = Not measurable
QRS Complex = Not measurable |
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Term
P Wave
Normal Duration
Source of possible variation |
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Definition
0.06-0.12
Disturbance in conduction within atria |
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Term
PR Interval
Normal Duration
Source of Possible Variation |
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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 |
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Term
QRS Complex
Normal Duration
Source of Possible Variation |
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Definition
<0.12 (0.06-0.12)
Disturbance in conduction in bundle branches or in ventricles |
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Term
ST Segment
Normal Duration
Source of Possible Variation |
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Definition
0.12
Disturbances usually caused by ischemia, injury, or infarction |
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Term
T Wave
Normal Duration
Source of Possible Variation |
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Definition
0.16
Disturbances usually caused by electrolyte imbalances, ischemia, or infarction |
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Term
QT Interval
Normal Duration
Source of Possible Duration |
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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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