Term
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Definition
| Impulses originate at SA node at a normal rate; regular, normal, 60-100, P:QRS = 1:1; PR interval 0.12-.20 |
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Term
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Definition
| Impulses originate at the SA node at a slow rate; regular, slow, P:QRS = 1:1; PR interval .12-.20; <60bpm |
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Term
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Definition
| Impulses originate at the SA node at a rapid rate; regular, fast, P:QRS = 1:1, PR interval .12-.20; >100bpm |
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Term
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Definition
| Impulses originate at the SA node at a varying rate; irregular, normal, P:QRS = 1:1, PR interval .12-.20; Irregular rate |
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Term
| Paroxysmal atrial tachycardia (PAT) |
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Definition
| Impulses recycle repeatedly in and near the AV node due to slowing in the area of the unidirectional block; Regular, fast, P:QRS = 1:1, PR interval is short (<.12), Atrial rate of 160-220 bpm, P waves regular but often inverted due to impulse recycling due to block |
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Term
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Definition
| Impulses travel in circular course in atria, setting up regular, rapid (220-300 bpm) waves without any isoeletric baseline; Variable block; Usually the ratio will remain constant; QRS occurs at regular intervals; QRS looks normal; P for every QRS; Not a QRS for every P, therefore no PR interval |
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Term
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Definition
| Impulses take chaotic, random pathways in the atria; Baseline can be coarsely or finely irregular; P waves are absent; QRS looks normal, but doesn't always occur at a regular rate |
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