ECG Flashcards
EKG electrode placement for 3 electrode system?
- white on right
- smoke over fire – black over red
SBAR?
S - situation
B - background
A - assessment
R - recommendations
What records electrical activity of the heart?
ECG
On 12 lead ECG, why are only 10 used?
because the final 2 leads are redundent
What 6 leads record electrical signals in the frontal plane?
- leads I, II, III
- aVR
- aVL
- aVF
What 6 leads record electrical signals in the transverse plane?
- V1-6
Placement of 10 electrodes?
- right arm
- left arm
- right leg
- left leg
- V1 = 4th intercostal space to the right of the sternum
- V2 = 4th intercostal space to the left of the sternum
- V3 = between electrodes 2 and 4
- V4 = 5th intercostal space in the mi-clavicular line
- V5 = horizontally even with V4 in the left anterior axilla
- V6 = horizontally even with V4 and 5 in mid axillary line
What is contracting during systole?
left ventricle
Normal conduction pathway?
SA node through atria –> AV node –> bundle of His –> purkinjie fibers –> (travel through intraventricular septum to lateral wall of right and left ventricle)
What is the primary pacemaker?
SA node
All myocardial cells can act as what?
a pacemaker in the absence of other pacers and as a result of pathology
R to R rhythms represent what?
ventricular rhythm
P to P rhythms represent what?
atrial rhythm
What does the PR interval represent?
- conduction time (the atria node slows conduction to give atria time to fire and ventricles time to fill)
- from where the p wave begins to the beginning of the QRS complex
What 2 things does the QRS complex represent?
- ventricular depolarization
- atrial repolarization