Upload
others
View
1
Download
0
Embed Size (px)
Citation preview
Electrical interference
Muscle tremor
Limb leads
4 leads on the limbs (right and left wrists and right
and left ankles)
Right ankle acts as ground lead-doesn’t form a trace
Need these 4 leads to have an ECG
Form Einthoven's triangle and the augmented limb
leads
Leads I, II, III, aVR, aVF and aVR
Chest leads 6 unipolar leads placed across the chest:
V1, V2, V3, V4, V5 & V6
Extra care needed with placement of the leads as incorrect placement can result in inaccurate interpretation!!
V1 4th intercostal space, right of sternum
V2 4th intercostal space, left of sternum
V3 halfway between V2 and V4 V4 5th intercostal space , midclavicular line
V5 Same horizontal position as V4, anterior axillary line V6 Same horizontal position of V4, midaxillary line.
The result..
Interpreting an ECG
1. Heart rate
2. Regularity
3. Rhythm
4. Morphology of complexes
5. Duration of complexes
6. Intervals
7. ST segments
Heart rate
We need to be able to calculate the number of QRS complexes in one minute
ECG is recorded over 10 seconds therefore you can multiply the number of
complexes on a strip by 6 to give you the rate per minute
Use the Rhythm strip at the bottom
11 complexes times 6 = 66bpm
Heart rate
Normal resting HR 60- 100 bpm
>100bpm: Tachycardia
< 60 bpm: Bradycardia