1 / 27

ECG Part II

ECG Part II. Rate-measure of frequency of occurrence of cardiac cycles(b/m). < 60 beats/min is a bradycardia 60-100 beats/min is normal >100 beats/min is a tachycardia. Rhythm Sinus-normal cardiac rhythm originating via impulse formation in the sinoatrial or sinus node.

stacia
Download Presentation

ECG Part II

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ECG Part II

  2. Rate-measure of frequency of occurrence of cardiac cycles(b/m) • < 60 beats/min is a bradycardia • 60-100 beats/min is normal • >100 beats/min is a tachycardia

  3. Rhythm Sinus-normal cardiac rhythm originating via impulse formation in the sinoatrial or sinus node • Defined by p wave axis that is positive in the inferior leads • Morphology is the same • Cadence is regular • NOT A P BEFORE EVERY QRS

  4. Axis-direction of ECG waveform in the frontal plane measured in degrees • Normal-frontal plane is directed leftward between -30 degrees and +90 degrees • Leads I and AVF should both be positive • Lead 1 is upright and AVF is negatively deflected (towards head) left axis deviation • Lead 1 is negative and AVF is negative, indeterminate axis

  5. Intervals-PR • PR- 0.10-0.220 sec • Time required for impulse to travel from the atrial myocardium(SA node) to ventricular myocardium • Reflects conduction through the AV node

  6. Intervals-QRS • Depends on the lead • Normally it is from the beginning of the Q wave to the end of the S wave • 0.07-0.120 sec

  7. Intervals- QTc • Reflects duration of activation and recovery of the ventricular myocardium • Varies inversly with heart rate • QTc = QT + 1.75(vent rate – 60) • Normal range is <.450 sec • R-R interval and divide in half

  8. Tachycardia's Wide vs. Narrow

  9. ATRIAL FIBRILATION

  10. Bundle Branch Blocks

  11. Myocardial Ischemia • Increase in myocardial demand due to decrease in blood flow, not cessation of flow • Only changes seen are in repolarization, st-t changes away from involved segment of myocardium

  12. Myocardial Infarction • Results due to cessation of blood flow, or a decrease in demand, therefore causing primary changes in QRS complexes with changes in the ST segments • This results in elevation of the J point

More Related