Term
What are the features of a normal sinus rhythm:
QRS Rate
Rhythm
Atrial Activity
QRS Width
P to QRS Relationship |
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Definition
QRS Rate: 60-100 BPM
Rhythm: Regular
Atrial Activity: Normal and consistent P wave configuration
QRS Width: .04-.12 seconds
P to QRS Relationship: 1:1 relationship with a P-R intervel between .12 and .20 seconds |
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Term
| What distinguishes Sinus Bradychardia from a NSR? |
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Definition
| QRS Rate: Less than 60 BPM |
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Term
| What distinguishes Sinus Tachycardia from a NSR? |
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Definition
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Term
| What distinguishes Sinus Arrhythmia from a NSR? |
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Definition
QRS Rate: Usually b/t 60-100
Rhythm: Irregular |
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Term
| What distinguishes a Sinus Pause from a NSR? |
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Definition
QRS Rate: Usually 60-100, but may vary
Rhythm: Irregular due to pause, but underlying rhythm may be regular
Atrial Activity: Normal and consistent P wave activity in the underlying rhythm
P to QRS: same as NSR except when beats are not present
Heart activity literally pauses |
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Term
| What distinguishes a Junctional Escpae Rhythm from a NSR? |
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Definition
QRS Rate: 40-60 BPM
Atrial Activity: Inverted or absent P-wave
P to QRS Relationship: 1:1 if P is present, P-R intervel will be less than .12 seconds, P waves may be hidden or appear after QRS complex |
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Term
| What distinguishes a Premature Junctional Complex from a NSR? |
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Definition
QSR: may occur at any rate
Rhythm: Irregular when PJCs occur
Atrial Activity: P waves may appear before or after the QRS ectopic complex, or may be hidden within the QRS
QRS Width: similiar to underlying rhythm
P to QRS: 1:1 relationship for all complexes with observable P wave |
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Term
| What distinguishes a First Degree AV block from a normal sinus rhythm? |
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Definition
QRS: 60-100 BPM, occasionally brady
P to QRS Relationship: P-R intervel greater than .20 seconds |
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Term
| What is another name for a second degree AV block Type I? |
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Definition
| Wenckebach/Morbitz Type I |
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Term
| What distinguishes a Second Degree AV Block Type 1 from a NSR? |
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Definition
QRS Rate: may occur at any rate
Rhythm: Irregular w/ dropped beats
P to QRS Relationship: P-R intervel progressively lengthens until QRS complex is dropped |
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Term
| What is another name for Second Degree AV Block Type II? |
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Definition
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Term
| What distinguishes a 2nd Degree AV block Type II from a NSR? |
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Definition
QRS Rate: may occur at any rate, most commonly produces slow ventricular rates
Rhythm: may be regular or irregular
QRS Width: may be normal, or if block is located w/in bundle branches, greater than .12
P to QRS Relationship: P waves can be seen that do not conduct QRS complexes, may occur at regular intervels 2:1, 3:1, etc. P-R intervels will be constant with all conducted QRS complexes. |
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Term
| What distinguishes a Third-Degree Av Block from a NSR? |
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Definition
QRS Rate: usually less than 60 BPM
Rhythm: P waves and QRS complex will have different rates, P waves typically faster
QRS width: depends upon escape pacemaker, may be normal or wide
P to QRS Relationship: no relationship |
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