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Cardiology SB > ECG > Flashcards

ECG Flashcards

1
Q

what is the name of the recording device

A

electrocardiograph

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2
Q

what is the name of the recording

A

electrocardiogram

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3
Q

what does the dipole represent

A

electrical vector

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4
Q

what are the components of the electrical vector

A

magnitude

direction

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5
Q

how is the magnitude determined

A

by the mass of cardiac muscle that is involved in the generation of the signal

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6
Q

how is the direction determined

A

by the overall activity of the heart any instant in time and varies during the cardiac cycle

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7
Q

what is meant by the recording electrode

A

depolarisation moves towards this electrode and gives a upward direction

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8
Q

what does the p wave represent and how long does it last for

A

Atrial depolarisation

0.08 - 0.10 sec

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9
Q

what does the QRS complex represent and how long does it last for

A

Ventricular depolarisation

less than 0.1 sec

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10
Q

what does the PR interval represent and how long does it last for

A

AV node delay

0.12 - 0.2 sec

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11
Q

what does the ST interval represent

A

Ventricular systole

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12
Q

what does the T wave represent

A

Ventricular repolarisation

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13
Q

what does the TP interval represent

A

Diastole

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14
Q

what are the three augment leads

A

aVR, aVL, aVF

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15
Q

why is aVR inverted

A

predominant vector is depolarisation moving away from the electrode

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16
Q

what plane of the heart do the chest leads show

A

horizontal plane

17
Q

how long does 1 small square represent

A

0.04s

18
Q

how long does 1 big square represent

A

0.2s

19
Q

how is heart rate calculated from an ECG

A

300/number of large squares between beats

300/number of large squares between R-R interval

20
Q

what is the approach to reading an ECG - 8 steps

A 
1 - Is electrical activity present?
2 - Is the rhythm regular or irregular?
3 - What is the heart rate?
4 - P-waves present?
5 - What is the PR interval?
6 - Is each P-Wave followed by a QRS complex? 
7 - Is the QRS duration normal?
8 - Then look at individual leads
21
Q

what does a normal ECG not exclude

A

MI
Intermittent Rhythm Disturbance
Stable Angina

22
Q

what is the reference pulse

A

10mm/1mV

23
Q

how long is 5 large squares

A

1 second

24
Q

how long is 30 large squares

A

6 seconds

25
Q

what is the standard calibration

A

25mm per sec

Cardiology SB (15 decks)

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