1
Q
12 Lead ECG
A
12 Lead ECG
- 10 leads but 12 views
- Bipolar limb leads - I, II, III
- Unipolar limb leads - aVR, aVL, AvF
- Inferior limb leads II, III, AvF
- Chest leads are unipolar
- Lateral precordial leads, V4, V5, V6
- Septal leads - V1, V2 (looking at septum)
- Anterior leads - V2, V3, V4 (mostly left ventrical)
- V1 and V2 - have negative deflections
2
Q
Heart Blocks
A
Heart Blocks
- Abnormal heart rhythm where heart beats too slow
- electrical signals are partially or totally blocked
- 3rd Degree is a life threat
3
Q
Bundle Branch Blocks
A
Bundle Branch Blocks
- Often asymptomatic or could present with syncope
- Common causes of MI and cardiomyopathy
4
Q
Triponins
A
Triponins
Protein enzymes from cardiomyocite breakdown that enter the blood stream
5
Q
Coronary Circulation
A
Coronary Circulation
Coronary arteries become occluded in an MI
6
Q
SA and AV Nodes
A
SA and AV Nodes
- pacemaker cells
- sodium and potassium used to fire
- SA node to AV node/Bundle of His (held up for fraction of second) to L and R bundle branches to purkinjie fibres
- AV junction is AV node and Bundle of His
7
Q
ECG Notes
A
ECG Notes
- P Wave - atrial depolarisation
- QRS Complex - ventricular depolarisation/atrial repolarisation
- T Wave - ventricular repolarisation (resting phase)
- J point (ST joint) should be on the iso-electric line
8
Q
Electrical Conductivity Rates
A
Electrical Conductivity Rates
SA Node 60-100bpm
AV Node 40-60 bpm
Bundle of His 20-40bpm
Purkinjie fibres 10-20bpm
