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CVS > 6 ECG > Flashcards

6 ECG Flashcards

1
Q

Where is the SA node located?

A

Located in the top right corner of the right atrium, near the junction of the SVC and the RA

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2
Q

What initiates the heart beat?

A

The SA node

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3
Q

What is considered the electrical gateway to the ventricles?

A

AV node

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4
Q

What does the P-wave show?

A

Atrial depolarization

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5
Q

What does the PQ segment show?

A

Time the signal travels from the SA node to the AV node

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6
Q

What does the Q wave show?

A

Septal depolarisation

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7
Q

What does the R wave show?

A

Depolarisation of the main ventricular mass

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8
Q

What does the S wave show?

A

Late ventricular depolarisaton at the base of the heart

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9
Q

Depolarisation spreading towards a positive electrode results in a ……

A

Upward deflection

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10
Q

Repolarisation spreading away from a positive electrode results in a

A

Upward deflection

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11
Q

What signal does SA node depolarisation give on an ECG

A

insufficient signal to register on an ECG

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12
Q

What is a Q wave?

A

Depolarisation of the inter-ventricular septum

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13
Q

How many recording electrodes are there?

A

10

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14
Q

Where are the limb electrodes placed?

A

Red - Right arm
Yellow - Left arm
Green - Left leg
Black - Right leg

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15
Q

Where is the V1 lead placed?

A

4th intercostal space to the right of the sternum

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16
Q

Which leads are the limb leads?

A

Lead 1 – voltage between the left arm and the right arm

Lead 2 – voltage between the left leg and the right arm

Lead 3 – voltage between the left leg and the left arm

17
Q

What are the augmented limb leads?

A

aVR, aVL, aVF

18
Q

Which leads are looking at the lateral side of the heart?

A

Lead I
aVL
V5
V6

19
Q

Which leads are looking at the inferior aspect of the heart?

A

Lead II
Lead III
aVF

20
Q

Which leads are looking at the anterior part of the heart?

A

V3 and V4

21
Q

Which leads are looking at the septum?

A

V1 an V2

22
Q

How many squares make up a second?

A

5 large squares

23
Q

How long is one large square?

A

0.2 seconds

24
Q

How do you work out the a regular heart rate?

A

300 divided by the RR

25
Q

How do you calculate an irregular heart rate?

A

Calculate the irregular heart rate by counting the number of QRS complexes per 6 seconds (30 Large boxes) and multiplying by 10

26
Q

How long is a normal PR interval?

A

3-5 small boxes

0.12 - 0.2 seconds

27
Q

What is the width of a normal QRS complex?

A

less than 0.12 seconds

2-3 small boxes

CVS (22 decks)

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