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ECGs > ECGs > Flashcards

ECGs Flashcards

1
Q

How many limb leads are there?

A

three

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2
Q

Where does limb lead I look?

A

RA–> LA

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3
Q

Where does limb lead two look?

A

RA–> LL

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4
Q

Where does limb lead three look?

A

LA–>LL

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5
Q

What does the P wave show?

A

atrial depolarisation

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6
Q

What does the QRS complex show

A

ventricular depolarisation

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7
Q

What does the T wave show?

A

ventricular repolarisation

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8
Q

What does the PR interval show?

A

AV nodal delay

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9
Q

What does the ST segment show?

A

ventricular systole

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10
Q

What does the TP interval show?

A

diastole

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11
Q

What is a electrocardiograph?

A

The DEVICE used the record the potential differences between distant sites on the body surface

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12
Q

What is an electrocardiogram?

A

A recording of the potentail differences

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13
Q

What are the six ‘standard’ lateral looking leads?

A

VR, VL, VF

I, II, III

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14
Q

Where does VL, I and II look>

A

The left lateral surface of the heart

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15
Q

Where doe VF and III look?

A

The inferior surface

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16
Q

Where does VR look?

A

The atria

17
Q

What leads look horizontally at the heart?

A

V1-V6

18
Q

Where do leads V1 and V2 look?

A

Right ventricle

19
Q

Where do leads V3 and V4 look?

A

Septum and the anterior wall of the left ventricle

20
Q

Where do the leads V5-V6 look?

A

Anterior and lateral walls of the left ventricle

21
Q

Which leads can determine the cardiac axis?

A

I, II, III

22
Q

Where does the depolarisation usually spread?

A

From the 11 o, clock to 5 o’clock

23
Q

What does a down ward deflection in lead I indicate?

A

Right axis deviation caused by right ventricular hypertrophy

24
Q

What does a down ward deflection in he QRS of lead II and III indicate?

A

Left axis deviation

Left ventricular hypertrophy

25
Q

What determines the magnitude of the electrical vector?

A

Size of the cardiac muscle

26
Q

What determines the direction of the electrical vector?

A

Overall activity of the heart during the cardiac cycle

27
Q

What is the normal length of the PR intervlal?

A

0.12- 0.2s

28
Q

What is the normal length of the P wave?

A

0.08-0.1 seconds

29
Q

What is the normal length of a QRS complex

A

< 0.1 s

30
Q

What is the standard amplitude on and ECG?

A

10mm/1mV

31
Q

What does one small box represent?

A

o.o4s

32
Q

What does one large box represent?

A

0.2s

33
Q

How do you calculate the heart rate on a regular ECG?

A

300/ number of large squares between QRS complexes

34
Q

Which lead is the rhythm strip?

A

II

ECGs (1 decks)

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