Electrocardiogram
rename
Updated
2007-02-05 19:15
Electrocardiogram
| Question | Answer |
|---|---|
| P wave | atrial depolarization |
| PR segment | conduction delay thru AV node (200msec) |
| QRS complex | ventricular depolarization (<120msec) |
| QT interval | mechanical contraction of the ventricles |
| T wave | ventricular repolarization |
| ST segment | isoelectric, ventricles depolarized |
| U wave | caused by hypokalemia |
| Peaked T wave | caused by hyperkalemia |
| Atrial Fibrillation | irregularly spaced QRS complexes |
| Atrial Flutter | sawtooth |
| 1st degree block | prolonged PR interval (>200) |
| 2nd degree block Mobitz 1 | "Wenckebach" progressive lengthening of PR until dropped beat |
| 2nd degree block Mobitz 2 | No change in PR interval, but ratio of P:QRS 2:1, 3:1, etc. |
| 3rd degree block (complete) | atria and ventricles beat independently of each other |
| Ventricular Fibrillation | no identifiable waves. fatal without defibrillation and CPR |
| ST elevation | transmural infarct |
| ST depression | subendocardial infarct |
