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EKG Waves
What do the bumps and squiggles mean?
| Question | Answer |
|---|---|
| What is another name for the baseline in an EKG? | isoelectric line |
| What happens at the isoelectric line? | nothing; no electrical activity |
| What happens during the P wave? | atrial depolarization (firing) |
| How long is the P wave? | 0.10 seconds |
| What does the PR interval represent? | The time required for the impulse to travel from the atria through the AV node and to the Purkinje network. |
| Where does the PR interval start and stop? | It starts at the beginning P wave and ends at the beginning of the QRS complex. |
| How long should the PR interval last? | 0.12-0.20 sec |
| What can the PR segment be used for? | diagnosing conditions. EX: depressed PR segment usually indicates pericarditis |
| Why is the QRS called a complex instead of a wave? | It is composed of three different waves; Q, R, and S |
| How would describe the look of a QRS complex? | narrow, steep angles, and sharp points |
| What does the QRS complex represent? | ventricular depolarization and atrial repolarization |
| How do you recognized the Q wave? | It is the first negative deflection (below the isoelectric line) after the P wave. |
| How do you recognize the R wave? | It is the first positive deflection (above the isoelectric line) after the P wave. |
| How do you recognize the S wave? | It is the second negative deflection (below the isoelectric line) after a Q or R wave. |
| How long should the QRS complex be? | less than or equal to 0.12 seconds |
| Where is the J point? | where the QRS complex ends and the ST segment begins |
| What is considered normal variance for the J point? | 1 mm up or down |
| What might be the problem is the J point is beyond its 1 mm variance? | This would indicate cardiac ischemia |
| Where is the ST segment found? | from the end of the QRS complex to the beginning of the T wave |
| What does the ST segment represent? | time between ventricular depolarization and ventricular repolarization |
| The ST segment is ___________ dependent. | heart rate |
| The ST segment should be at the isoelectric line. (TRUE / FALSE) | TRUE; being elevated or depressed indicates ischemia or infarction (both are bad) |
| The T wave should be symmetrical. (TRUE / FALSE) | FALSE; it should be asymmetrical |
| How long should the QT interval be? | 0.36-0.44 seconds |
Created by:
MrsReynolds
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