Term
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Definition
NORMAL SINUS RHYTHM (NSR)
Rate: 60 - 100 bpm
Rhythm: Regular
P Waves: Normal
PR Interval: 0.12 - 0.20 sec
QRS Complex: 0.10 sec or less |
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Term
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Definition
SINUS BRADYCADIA
Rate: Less than 60 bpm
Rhythm: Regular
P Waves: Normal
PR Interval: 0.12 - 0.20 sec
QRS Complex: 0.10 sec or less |
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Term
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Definition
SINUS TACHYCARDIA
Rate: Greater Than 100 bpm
Rhythm: Regular
P Waves: Normal
PR Interval: 0.12 - 0.20 sec
QRS Complex: 0.10 sec or less
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Term
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Definition
SINUS ARRHYTHMIA
Rate: Usually 60 - 100 bpm, but may be slower
or faster
Rhythm: Irregular
P Waves: Normal
PR Interval: 0.12 - 0.20 sec
QRS Complex: 0.10 sec or less |
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Term
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Definition
SUPRAVENTRICULAR TACHYCARDIA (SVT)
INCLUDES ATRIAL TACHYCARDIA, AVNRT & AVRT
Rate: 100 - 250 bpm (usually 180 - 220 bpm)
Rhythm: Regular
P Waves: Usually not identifiable
PR Interval: Not measurable
QRS Complex: 0.10 sec or less
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Term
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Definition
ATRIAL FIBRILLATION (COURSE)
Rate: Atrial rate usually 400 - 600 bpm;
ventricular rate variable
Rhythm: Ventricular rhythm usualyy irregularly
regular
P Waves: No identifiable P waves, course F waves
PR Interval: Not measurable
QRS Complex: 0.10 sec or less |
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Term
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Definition
ATRIAL FIBRILLATION (FINE)
Rate: Atrial rate usually 400 - 600 bpm;
ventricular rate variable
Rhythm: Ventricular rhythm usualyy irregularly
regular
P Waves: No identifiable P waves, very fine F
waves
PR Interval: Not measurable
QRS Complex: 0.10 sec or less
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Term
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Definition
ATRIAL FLUTTER
Rate: Atrial rate usually 250 - 450 bpm;
typically 300 bpm
Rhythm: Atrial regular, Ventricular regular
irregular
P Waves: No identifiable P waves "saw tooth" F
waves are present
PR Interval: Not measurable
QRS Complex: 0.10 sec or less, but may be widened if
waves are buried in the QRS
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Term
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Definition
PREMATURE VENTRICULAR CONTRACTION (PVC)
Rate: Usually WNL, but depends on the
underlying rhythm
Rhythm: Essentially regular
P Waves: Usually absent
PR Interval: None
QRS Complex: Usually 0.12 sec or greater, wide and
bizzare; T wave usually in opposite
direction of QRS
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Term
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Definition
VENTRICULAR TACHYCARDIA
Rate: 150 - 300 bpm; typically 200 - 250
Rhythm: May be regular, or irregular
P Waves: None
PR Interval: None
QRS Complex: 0.12 sec or greater
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Term
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Definition
VENTRICULAR FIBRILLATION
Rate: Cannot be determined, there are no
discernable waves or complexes
Rhythm: Rapid and caotic with no pattern or
regularity
P Waves: Not identifiable
PR Interval: Not identifiable
QRS Complex: Not identifiable
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Term
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Definition
ASYSTOLE
Rate: No discernable Rate
Rhythm: Irregular
P Waves: None
PR Interval: None
QRS Complex: None
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Term
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Definition
FIRST DEGREE AV BLOCK
Rate: Usually WNL, but depends on the
underlying rhythm
Rhythm: Regular
P Waves: Normal
PR Interval: Prolonged, greater than 0.20 sec
QRS Complex: 0.10 sec or less
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Term
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Definition
SECOND DEGREE AV BLOCK
TYPE 1
Rate: Atrial faster rate than ventricular
Rhythm: Atrial regular, Ventricular irregular
P Waves: Normal, but not always followed by
a QRS
PR Interval: Lengthens w/ each cycle until a QRS
is dropped
QRS Complex: 0.10 sec or less
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Term
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Definition
SECOND DEGREE AV BLOCK
TYPE 2
Rate: Atrial faster rate than ventricular
Rhythm: Atrial regular, Ventricular irregular
P Waves: Normal, but not always followed by
a QRS
PR Interval: Normal or slightly prolonged
QRS Complex: Usually greater than 0.10 sec,
periodically absent
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Term
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Definition
THIRD DEGREE AV BLOCK
Rate: Atrial faster rate than ventricular
Rhythm: Atrial regular, Ventricular regular
P Waves: Normal, but not always followed by
a QRS
PR Interval: None
QRS Complex: May be narrow or wide & unusual
looking
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Term
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Definition
VENTRICULAR TACHYCARDIA
(monomorphic)
Rate: 150 - 300 bpm; typically 200 - 250
Rhythm: May be regular, or irregular
P Waves: None
PR Interval: None
QRS Complex: 0.12 sec or greater
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Term
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Definition
IDIOVENTRICULAR ESCAPE RHYTHM
Rate: 20 - 40 BPM
Rhythm: Regular
P Waves: None
PR Interval: None
QRS Complex: Greater than 0.12 sec
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Term
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Definition
JUNCTIONAL RHYTHM
Rate: 40 - 60 BPM
Rhythm: Very Regular
P Waves: May occur before, during, or after the QRS; if visible, the P wave is inverted in leads II, III, and AVR
PR Interval: If a P wave occurs before the QRS, the PR interval will usually be 0.12 sec or less; if no P wave occurs before the QRS, there will be no PR interval
QRS Complex: Usually 0.10 sec or less unless it is aberrantly conducted or an intraventricular conduction delay exists.
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Term
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Definition
JUNCTIONAL BRADYCARDIA
Rate: Les than 40 BPM
Rhythm: Regular
P Waves: May occur before, during, or after the QRS; if visible, the P wave is inverted in leads II, III, and AVR
PR Interval: If a P wave occurs before the QRS, the PR interval will usually be 0.12 sec or less; if no P wave occurs before the QRS, there will be no PR interval
QRS Complex: Usually 0.10 sec or less unless it is aberrantly conducted or an intraventricular conduction delay exists. |
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Term
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Definition
ACCELERATED JUNCTIONAL RHYTHM
Rate: Greater than 60 BPM
Rhythm: Regular
P Waves: May occur before, during, or after the QRS; if visible, the P wave is inverted in leads II, III, and AVR
PR Interval: If a P wave occurs before the QRS, the PR interval will usually be 0.12 sec or less; if no P wave occurs before the QRS, there will be no PR interval
QRS Complex: Usually 0.10 sec or less unless it is aberrantly conducted or an intraventricular conduction delay exists. |
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Term
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Definition
JUNCTIONAL TACHYCARDIA
Rate: 101 - 180 BPM
Rhythm: Regular
P Waves: May occur before, during, or after the QRS; if visible, the P wave is inverted in leads II, III, and AVR
PR Interval: If a P wave occurs before the QRS, the PR interval will usually be 0.12 sec or less; if no P wave occurs before the QRS, there will be no PR interval
QRS Complex: Usually 0.10 sec or less unless it is aberrantly conducted or an intraventricular conduction delay exists. |
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Term
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Definition
PREMATURE JUNCTIONAL COMPLEX
Rate: Usually WNL but depends on the underlying rhythm
Rhythm: Regular with premature beats
P Waves: May occur before, during, or after the QRS; if visible, the P wave is inverted in leads II, III, and AVR
PR Interval: If a P wave occurs before the QRS, the PR interval will usually be 0.12 sec or less; if no P wave occurs before the QRS, there will be no PR interval
QRS Complex: Usually 0.10 sec or less unless it is aberrantly conducted or an intraventricular conduction delay exists. |
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Term
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Definition
PREMATURE ATRIAL COMPLEX
Rate: Atrial rate usually within normal range but depends on the underlying rhythm
Rhythm: Regular with premature beats
P Waves: Premature (occurring earlier than the next expected sinus P wave), positive (upright) in lead II, one before each QRS complex, often differ in shape from sinus P waves - may be flattened, notched, pointed or biphasic or lost in the preceeding T wave
PR Interval: May be normal or prolonged depending on the prematurity of the beat.
QRS Complex: Usually 0.10 sec or less, but may be wide (abberant) or absent depending on the prematurity of the beat; the QRS of the PAC is similar in shapes to those of the underlying rhythm unless the PAC is abnormally conducted.
waves are buried in the QRS
NOTE: A PAC is not a rhythm. It is a complex that appears in an underlying rhythm.
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