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ECG > ECG interpretation > Flashcards

ECG interpretation Flashcards

1
Q

how to calculate rate if regular?

A

300/large squares from R-R
1500/small squares from R-R

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2
Q

how to calculate rate if irregular?

A

number of R waves in rhythm strip x 6

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3
Q

how long is a small square?

A

0.04ms

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4
Q

how long is a large square?

A

0.2ms

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5
Q

where is the sinus node?

A

RA

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6
Q

where do junctional rhythms originate?

A

AV node

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7
Q

P waves in sinus?

A

up in lead II
down in AVR

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8
Q

how to work out axis?

A
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9
Q

what is the P wave?

A

atrial depol

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10
Q

how long should P to R be?

A

3-5ss

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11
Q

what is QRS?

A

ventricular depol

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12
Q

what is normal QRS?

A

<3ss

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13
Q

what is Q wave / R wave?

A

downwards first part of QRS - Q wave
upward deflection of first part of QRS - R wave

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14
Q

what are T waves?

A

ventricular repol

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15
Q

where is normal T wave inversion?

A

V1
AVR

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16
Q

what is the QT interval?

A

ventricular depol and repol

17
Q

normal QT interval?

A

longer than half the R-R interval is abnormal
>460 is abnormal

18
Q

what is 1st degree HB?

19
Q

what types of 2nd degree HB are there?

A

mobits type 1
mobits type 2

20
Q

what is 3rd degree HB?

A

absence of relationship between P and QRS

21
Q

what is mobits type 1?

A

progressive prolongation of the PR interval before the missed QRS complex

22
Q

what is mobits type 2?

A

PR interval constant
QRS missed

23
Q

how to differentiate between RBB and LBB?

A

V1 and V6
William (L)
Marrow (R)

24
Q

where do narrow QRS conduction originate from?

A

SA
atria
junctional (AV)

25
Q

what are non shockable rhythms?

A

PEA
asystole

26
Q

6 stage to analysing rhythm

A

is there electrical activity
is ventricular activity reg/irreg
what is the ventricular rate
QRS broad or narrow
atrial activity? (P wave)
is atrial activity related to ventricular

27
Q

causes for LBBB?

A

aortic stenosis
IHD
hypertension

28
Q

ecg signs for LBBB?

A

v1 deep S wave
V6 M shaped R wave

29
Q

ecg signs for RBBB?

A

v1 RSR
v6 W in S wave

30
Q

causes for RBBB?

A

IHD - exclude
RVH
PE

31
Q

why is new RBBB concerning?

A

Righ bundle supplied by LAD
new RBB may be concerning

32
Q

anterior leads? suppy?

33
Q

lateral leads? suppy?

A

I, aVL, V5+6
circumflex (comes from LAD)

34
Q

inferior leads? supply?

A

II, III, avF
RCA

35
Q

what does 3rd degree HB look like on ECG?

A

constant P-P
no association between QRS and P

ECG (1 decks)

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