chapter 2 - ecg
DESCRIPTION
Chapter 2 - ECG. Supraventricular Rythms Early beats arising from above the ventricles. PAC, PJC. Normal Sinus Rhythm Sinus Arrythmia Can be caused by respiration. HR increases with inspiration ( vagal nerve depressed) and decreases with expiration ( vagal nerve stimulated). - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Chapter 2 - ECG](https://reader035.vdocuments.us/reader035/viewer/2022062305/5681594e550346895dc68cd1/html5/thumbnails/1.jpg)
Chapter 2 - ECGSupraventricular Rythms
Early beats arising from above the ventricles.PAC, PJC
![Page 2: Chapter 2 - ECG](https://reader035.vdocuments.us/reader035/viewer/2022062305/5681594e550346895dc68cd1/html5/thumbnails/2.jpg)
![Page 3: Chapter 2 - ECG](https://reader035.vdocuments.us/reader035/viewer/2022062305/5681594e550346895dc68cd1/html5/thumbnails/3.jpg)
Normal Sinus Rhythm
Sinus ArrythmiaCan be caused by respiration. HR increases with inspiration (vagal nerve depressed) and decreases with expiration (vagal nerve stimulated).
![Page 4: Chapter 2 - ECG](https://reader035.vdocuments.us/reader035/viewer/2022062305/5681594e550346895dc68cd1/html5/thumbnails/4.jpg)
Normal Sinus Rythm
• A. Figure 2.4, page 21.
Sinus Tachycardia and SA Nodal Re-Entrant Tachycardia
If obtained under resting conditions this would be considered:“SA Nodal Re-Entrant Tachycardia” (pg. 23)
![Page 5: Chapter 2 - ECG](https://reader035.vdocuments.us/reader035/viewer/2022062305/5681594e550346895dc68cd1/html5/thumbnails/5.jpg)
Sinus Pauses – Difficult to know why• Failure of SA Node to depolarize
– Note: after pause rhythm resumes with a “P” wave that is normal with a normal QRS.
• SA Block – depolarization does not “escape” from the SA Node– Note: Rhythm resumes with a normal
QRS.
![Page 6: Chapter 2 - ECG](https://reader035.vdocuments.us/reader035/viewer/2022062305/5681594e550346895dc68cd1/html5/thumbnails/6.jpg)
PAC – premature, ectopic beat arising somewhere other than the SA Node. Arises in atria or AV node. P wave morphology is different. PR interval will differ (shorter) due to change in time for conduction to move to ventricles. QRS is normal.
• Blocked or non-conducted PAC. AV node is still in the refractory period.
*= ectopic focus
![Page 7: Chapter 2 - ECG](https://reader035.vdocuments.us/reader035/viewer/2022062305/5681594e550346895dc68cd1/html5/thumbnails/7.jpg)
Junctional Premature Complex or PJC• Premature beats w/- or
absent P waves due to origin at or near the AV Node
• Sometime difficult to decide origin so both terms will work.