ECG Workshop Flashcards
how many electrodes form a 12 lead ECG?
10
how many electrodes go on the chest?
6
where are V1 and 2 located on ECG?
4th intercostal space at each sternal border
what limbs are used for ecg?
RA
LA
RL
what is V3 used for in ECG?
V2-4
where is V4 placed in ECG?
5th intercostal space midclavicular line
leads are placed on the inner/outer aspect of the limb
inner
lead 1 measures
RA-LA
recording electrode for lead 1 is…
LA
lead 2 is..
right arm to left leg
recording electrode for lead 2 is…
left leg
lead 3 is..
LA to LL
recording electrode for lead 3 is…
LL
name the 6 chest leads
1, 2, 3
avL, avF, avR
name the anterior ECG leads
V3-4
name the septal ECG leads
V1-2
name the lateral ECG leads
1, avL, V5, V6
calibration of an ECG?
25mm/s
how many large boxes are there per second on an ECG?
5 boxes
a large box equates to how many seconds?
0.4s
what is the normal electrical axis of the heart
+90 to -30
the axis is normal if what axes are upright?
1 and avF
what will leads 1 and avF look like in left axis deviation?
1 positive
avF negative
what will leads 1 and avF look like in right axis deviation
1 negative
avF positive
how can you work out if an ECG is irregular in rhythm?
if there is uneven space between each QRS complex
how to work out an irregular heart rate on ECG
no. of QRS complexes in 30 boxes x 10
how to work out normal HR on ECG
no. of large boxes between 2 QRS complexes, divide this by 300
how to work out normal HR on ECG
300 / no. of large boxes between 2 QRS complexes
QRS should be shorter than…
<0.1secs
<2-3 small squares
how to introduce an ECG?
ECG of (patient name, DOB) taken at (date, time), calibration
how should you describe an ECG?
is electrical activity present? rhythm irregular or regualar rate p waves present? each p wave followed by QRS changes to QRS/ST wave?
how should you describe an ECG?
is electrical activity present? rhythm irregular or regular rate p waves present? each p wave followed by QRS changes to QRS/ST wave?
describe mobitz 1
progressive prolongation of the PR interval until you get a dropped beat
describe mobitz 2
normal PR interval length but some arent followed by a QRS complex
Tx mobitz 1
mostly conservative
Tx mobitz 2
pacemaker
why can you get chest pain in tachycardia?
myocardium is perfused during diastole
adenosine works on the __ node
AV
ST depression is a sign of…
myocardial ischaemia
