Term
| Which cells in heart have automaticity? |
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Definition
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Term
| Which heart cells have excitability and conductivity? |
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Definition
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Term
| Which heart cells have contractility? |
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Definition
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Term
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Definition
| The ability of the pacemaker cells to generate their own electrical impulses spontaneously. |
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Term
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Definition
| The ability of cardiac cells to respond to an electrical impulse |
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Term
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Definition
| The ability of cardiac cells to conduct an electrical impulse |
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Term
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Definition
| The ability of cardiac cells to cause cardiac muscle contraction |
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Term
| How does a cell become depolarized? |
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Definition
Cell is stimulated
Potassium leaves, sodium enters. Inside becomes positive. (depolarized)
Muscle contraction occurs. |
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Term
| How does a cell become repolarized? |
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Definition
Na/K pump activated
Brings K back into cell, inside is more negative (repolarized) |
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Term
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Definition
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Term
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Definition
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Term
| AV node three main functions: |
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Definition
*Slow conduction of electrical impulse, allowing for atrial kick (20-30% of CO)
*Serve as a backup pacemaker if SA fails
*Block some impulses from being conducted to ventricles when atria is rapid, protecting ventricles from dangerously fast rates. |
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Term
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Definition
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Term
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Definition
Atrial depolarization
Electrical impulse spreads fthroughout R/L atria. |
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Term
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Definition
| Onset of atrial depolarization to onset of ventricular depolarization. |
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Term
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Definition
Ventricular depolarization
Spread of electrical impulse throughout the R/L ventricle |
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Term
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Definition
| Early ventricular repolarization |
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Term
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Definition
| Ventricular repolarization |
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Term
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Definition
| Late ventricular repolarization |
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Term
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Definition
| Total ventricular activity |
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Term
| Absolute refractory period def |
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Definition
Cardiac cells are unable to respond to an electrical stimulus.
Cells have not completely repolarized. |
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Term
| Absolute refractory period on wave |
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Definition
| Onset of QRS to peak of T wave |
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Term
| Relative refractory period def |
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Definition
| Cardic cells have been repolarized sufficiently to respond to a strong stimulus. |
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Term
| Relative refractory period on wave |
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Definition
| Peak of T wave to end of T wave. |
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Term
| A p wave that is tall and beaked, possibly biphasic in some leads could be d/t? |
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Definition
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Term
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Definition
| seen when impulse originates from ectopic site |
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Term
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Definition
Impulse delayed longer than normal in AV node.
AV block |
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Term
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Definition
| MI, Hyperkalemia, Hypothermia |
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Term
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Definition
| Myocardial ischemia, Hypokalemia, digitalis effects (swooped) |
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Term
| Normal QT interval should be.... |
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Definition
| Less than 1/2 the R-R interval. |
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Term
| False high rate alarms by be d/t |
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Definition
| Muscle movement from patient turning in bed or moving extremities. Seizure activity |
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Term
| False low rate alarms d/t |
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Definition
disturbance in transmission of signal.
Ineffective contact between skin and electrode.
Dried gel
Loose electrode
Disconnected lead wire.
Low voltage QRS |
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Term
| Telemetry related interference may be caused by |
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Definition
Weak batteries
Transmitter being used on outer reception area.
Sharp spikes or straight lines on ECG |
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Term
| Electrical interference may occur from |
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Definition
Pt using hair dryer or electric razor
Multiple pieces of equipment plugged into same electrical receptacle
Improperly grounded equipment is in use
Loose connections or exposed wiring present.
Shows as fine, even, rapid spikes on ECG |
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Term
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Definition
| Caused by exaggerated respiratory movements, (COPD pts) |
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Term
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Definition
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Term
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Definition
Time in seconds to form clot.
Will be monitored with heparin therapy. |
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Term
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Definition
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Term
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Definition
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Term
| Sinus arrhythmia results from |
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Definition
| Changes in intrathoracic pressure during breathing. HR increases slightly during inspiration and decreases slightly during exhalation. |
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Term
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Definition
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Term
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Definition
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Term
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Definition
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Term
| Tacydysrhythimas effects on CO |
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Definition
| Initially increase CO and BP. Over time decreases CO/BP |
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Term
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Definition
Palpitations
Chest discomfort
Restlessness or anxiety
Pale, cool skin
Syncope |
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Term
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Definition
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Term
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Definition
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Term
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Definition
| Watch for confusion, paresthesias, slurred speech, drowsiness or seizure activity. |
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Term
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Definition
| AF, atrial flutter, PSVT, PVC’s. |
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Term
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Definition
Monitor HR/BP
Assess for SOB or wheezing.
Assess for insomnia, fatigure and dizziness. |
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