Term
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Definition
| electrical firing of SA node = atrial depolarization. |
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Term
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Definition
| between P and Q, results from pause in electrical conduction as depolarization slows |
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Term
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Definition
| depolarization of R and L atria. 0.12 - 0.20 seconds |
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Term
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Definition
| depolarization of both ventricles. less than 0.12 seconds |
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Term
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Definition
| early repolarization of the ventricles. |
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Term
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Definition
| ventricular repolarization |
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Term
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Definition
| total time required for ventricular depolarization to repolarization. 0.38 - 0.42 seconds |
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Term
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Definition
1. determine rhythm
2. measure HR
3. Examine P waves
4. Examine P to QRS ratio
5. Measure PR interval
6. Examine the QRS complex
7. Interpret rhythm |
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Term
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Definition
| less thank 60 beats/min for both atria & ventricles. May be normal during sleep & for athletes. Caused by vagal stim, acute MI, hypoxia, digitalis, beta blockers and Ca channel blockers |
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Term
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Definition
| greater than 100 beats/min. Normal response to exercise, fever, anxiety, pain, hypoxia, CHF, acute MI, infection, sympathetic stimulation, anemia, and other stressors that increase need for O2 |
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Term
| Sick Sinus Syndrome (SSS) |
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Definition
| different dysrhythmias caused by an unhealthy sinus node. Most often in heart diseased elderly |
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Term
| Premature Atrial Complexes (PAC) |
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Definition
| single early beats within an underlying rhythm. P waves of early beats may have a different configuration |
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Term
| Supraventricular Tachycardia (SVT) |
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Definition
| rapid dysrhythmia that occurs above the ventricle in either the atria or AV junction. AT is often initiated by PACs |
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Term
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Definition
| atrial rhythm is regular and ventricular rhythm may or may not also be regular depending on AV conduction. Atrial rate of 250-350BPM. Often seen w/ heart disease, CHF, cardiac valvular disease, and post cardiac surgery. |
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Term
| Atrial Fibrilation (AF or AFib) |
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Definition
| rapid firing of multiple irritable foci in atria = no effective atrial contraction because there is no uniform wave of depolarization. Tx w/ anticoagulants, coumadin, beta blockers, & cardioversion |
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Term
| Premature Junctional Complexes (PJC) |
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Definition
| early beats that arise from AV junction. P waves usually inverted. Usually do not cause symptoms, but if sympotms occur, Tx like PAC |
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Term
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Definition
| SA node failed, AV node paces heart at 40-60BPM. P wave usually inverted |
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Term
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Definition
| all impulse conducted to ventricles is delayed. HR usually WNL. RRR. PR interval > 0.20 seconds. Usually no Tx necessary |
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Term
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Definition
not all impulses from atria are conducted to ventricles. SA fires regularly, but some impulses are blocked at AV junction.
Type 1 - irregular rhythm d/t non conducted P wave
Type II - more serious, can progress to 3rd degree AV block, bradycardic, block occurs below bundle of His. |
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Term
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Definition
| complete heart block, no impulse from atria are conducted through AV junction. Atria & Ventricles beat independently of each other. HR 40-60BPM. No consistent PR interval. Need a pacemaker. |
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Term
| Bundle Branch Block (BBB) |
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Definition
| Intraventricular conduction delay or block in bundle branches. Impulse may move slowly from one ventricle to the other. May be temp or perm. |
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Term
| Premature Ventricular Complexes (PVC) |
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Definition
| early beats w/in an underlying rhythm initiated by an irritable focus in one ventricle. Has no P wave. |
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