ECG - Introduction Flashcards

1
Q

What does the P wave represent?

A

Atrial Depolarization

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2
Q

What does the QRS complex represent?

A

Ventricular depolarization

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3
Q

What does the T wave represent?

A

Ventricular RE-polarization

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4
Q

What is is the Isoelectric line?

A

Beneath the line = negative impulses
Above the line = positive impulses

Isolelectric line = Baseline; no electrical activity

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5
Q

What is the J point?

A

The end of the QRS complex

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6
Q

What does the PR interval tell us, and how is it measured?

A

measured from START of P wave to START of the QRS complex.

Tells us the time from Atrial depolarization –> to ventricular depolarization

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7
Q

What is a normal PR interval

A

0.12 - 0.20 Seconds (3-5 small squares)

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8
Q

What is a normal QRS complex duration?

A

0.12s (3 small squares)

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9
Q

What does the QT interval tell us, and how is it measured?

A

Tells us the time it takes for ventricular depolarization and depolarization to both occur.

take Measured from START of QRS complex to end of the T wave.

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10
Q

What is a normal QT interval?

A

Males = 440ms

Females = 460ms

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11
Q

What does the ST segment tell us, and how is it measured?

A

represents the period between ventricular depolarization (the QRS complex) and the beginning of ventricular repolarization (the T wave)

It is measured from the end of the QRS complex and the beginning of the P wave.

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12
Q

What is a normal ST segment time?

A

0.08 - 0.12 seconds or 80 - 120ms

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13
Q

how long is 1 small box on an EC?

A

0.04 seconds or 40ms

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14
Q

5 small boxes = 1 big box, how long does 1 big box represent?

A

0.2 seconds or 200ms

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15
Q

how long does 5 big boxes boxes represent?

A

1 second or 1000ms.

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16
Q

Vertical Axis?

A

represents amplitude

17
Q

How to measure heart rate on an ECG?

A

if it is a six second lead strip ( 30 big boxes) = times the heart rate by 10

1500 method: count the small boxes in between two QRS complexes and divide that by 1500 <– only works accurate for regular rhythm

18
Q

What are the pre cordial leads?

19
Q

Which leads provide an inferior view of the heart (INFERIOR LEADS) ?

A

CONTIGUOUS LEADS (next to each other or touching):

  • lead II
  • Lead III
  • aVF
20
Q

Which leads provide a Lateral view of the heart (LATERAL LEADS) ?

A

CONTIGUOUS LEADS (touching or next to each other):

  • Lead I
  • aVL
  • V5
  • V6

All view lateral wall of left ventricle

21
Q

Which leads provide an Anterior view of the Heart?

A

CONTIGUOUS LEADS:

  • V3
  • V4

(V1,V2 (septal anterior view)

View anterior wall of the left Ventricle

22
Q

Which leads provide a view of the hearts septum (SEPTAL LEADS)?

A

CONTIGUOUS LEADS:

  • V1
    -V2

View septal wall of the heart

23
Q

Which leads in an ECG usually have positive T waves?

A
  • lead I
  • Lead II
  • Lead V3 - V6
24
Q

Which lead in an ECG usually shows the T waves as negative?

25
ECG wave formation (depolarisation)
• depolarisation TOWARDS a positive electrode = positive complex • Depolarisation AWAY from a positive electrode = negative complex
26
What does lead V6 look at?
Left ventricle and bundle branch
27
What does lead V1 look at?
Right ventricle and bundle branch