ECG Basics 1 Flashcards

1
Q

Name what is happening at each step.

A
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2
Q

On ECG paper

1 large block = ____ seconds

____ large blocks = 1 second

___ large blocks = 3 seconds

A
  • 1 large block = 0.2 seconds, with each small box repreentnig 0.04 seconds
  • 5 large blocks = 1 second
  • 15 large blocks = 3 seconds
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3
Q

1 small box measured vertically = ____

1 large box measured vertically = _____

2 large boxes measured vertically = _____

A
  • 1 small box measured vertically = 0.1 mV
  • 1 large box measured vertically = 0.5 mV
  • 2 large boxes measured vertically = 1 mV
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4
Q

For ventricular rhythms, examine the ______.

For atrial rhythm, examine the _______.

A
  • R-R intervals
    • Q: Are they regular? Is each heart beats R-R interval equal?
  • P-P intervals
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5
Q

How do we calculate HR?

A

[Number of QRS complexes in 6 seconds] * [10]

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6
Q

P wave

  • NL amplitude:
  • NL duration:
A
  • NL amplitude: 0.05 to 0.25 mV (0.5 to 2.5 small boxes)
  • NL duration: 0.06 - 0.11 seconds (1.5 -2.75 small boxes)
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7
Q

PR interval indicates the ___________.

NL?

How is this affected as HR increases?

A
  • AV conduction
  • NL: 0.12 to 0.2 seconds (3-5 small boxes)
  • Shortens as HR increases
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8
Q

QRS wave: ventricular depolarization and contraction

  • NL duration
A

0.08- 0.10 seconds

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9
Q

T wave: ventricular repolarization

We should take note of what kind of T waves?

A

Downward (negative) deflection or ones with tall, pointed peaks.

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10
Q

QT interval represents the time of_________

A

Ventricular depolarization + ventricular repolarization

-begining of QRS wave => end of T wave

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11
Q

QT interval is _______seconds (_____ boxes)

A

0.36 to 0.44 seconds (9-11 boxes)

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12
Q

ST segment represents the ______________

The ST segment is the line ___________

A
  • ST segment represents the early part of ventricular repolarization.
  • The ST segment is the line that from the end of the QRS complex to beginning of the T wave.
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