The ECG Flashcards

1
Q

How does an ECG work?

A

Potential differences between distant sites on the Body surface measurable by electrodes placed on the skin coupled to a sensitive recording device (ECG)

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2
Q

What are the 3 standard limb leads?

A

Lead 1 : Right arm (RA) -ve to Left arm (LA)+ve
Lead 2: RA-ve - LL+ve
Lead 3 : LA-ve - LL+ve

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3
Q

What are the 3 augmented limb leads?

A
  • augmented voltage right
  • augmented voltage left
  • augmented voltage foot
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4
Q

How many chest leads are there ?

A

6

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5
Q

How do you calculate heart rate?

A

300/number of large squares between beats

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6
Q

What is the ECG Rhythm strip?

A

-prolonged recording of one lead (usually standard limb lead 2) - this allows you to detect rhythm disturbance

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7
Q

Where is the rhythm strip on the paper?

A

Bottom of the page

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8
Q

Why are 12 leads needed?

A
  • Determine the axis of the heart in thorax
  • Look for any ST segment or T wave changes in relation to specific regions of the heart. This is curtail e.g. in diagnosing Ischaemic Heart Disease
  • Look for any voltage criteria changes. This is curtail e.g. in diagnosing chamber hypertrophy
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9
Q

What 3 significant disease cannot be identified by a resting ECG?

A
  • myocardial infarction
  • intermittent rhythm disturbance
  • stable angina
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