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CVS Lecture Reviews > ECG > Flashcards

ECG Flashcards

1
Q

What causes potitive inflection?

A

Depolarisation towards a positve elecrtode

Repolarisation away from a positive electrode

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2
Q

What casues degative inflections?

A

Depolarisation away from a positive electrode

Repolarisation towards a positive electrode

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3
Q

What does the P wave represent?

A

Atrial depolarisation

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4
Q

What does the Q wave represent?

A

Left to right depolarisation of the intraventricular septum

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5
Q

What does the R wave represent?

A

Depolaristaion of main ventricular mass

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6
Q

What does the S wave represent?

A

Last past of ventricular depolarisation

Negative as moving away from + electrode

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7
Q

What does the T wave represent?

A

Ventricular repolarisation

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8
Q

What are segments?

A

Connect specific parts of the ECG
Should be isoelectric
If elevated/ depressed= diseased

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9
Q

What are intervals?

A

Time between 2 specific ECG events

Talk about time not elevation/ depression

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10
Q

What does the QRS complex show?

A

Ventricular depolarisation

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11
Q

What makes up the PR interval and what does it show?

A

PR wave and PR segment

Time between depolarisation of atria to ventricles

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12
Q

What is the QRS interval and what does it show?

A

Is the QRS complex

How long the ventricles take to contract

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13
Q

What is the QT interval and what does it show?

A

QRS complex + ST segment + T wave

Shows how long it takes for ventricles to depolarise and repolarise

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14
Q

How to calculate QT interval?

A

If normal rhythm approximately 0.5 RR
Between 0.33 and 0.44 secs

If tachy or Bradi use formular to take intno account changes in HR

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15
Q

How to calculate HR with a regular rhythm?

A

300/ no big boxes between beats

R-R

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16
Q

How to calculate HR with irregular rhythm?

A

Calculate no beats on ECG rhythm strip (10 secs)

Multiply by 6

17
Q

How to determine if in sinus rhythm?

A

Look at Lead 2

  • Regular rhythm (R waves)?
  • Normal HR (60-100)?
  • P waves? (Present and upright)?
  • P waves all followed by QRS?
  • Normal QRS duration? (Not larger than 3 small boxes)
  • Normal PR interval (3-5 small boxes)?
18
Q

What is the normal PR interval?

A

3-5 small boxes

19
Q

WHat is the normal QRS interval?

A

Less than 3 small boxes

20
Q

What is the normal QT interval?

A
  • Normal HR: less than half RR

- Abnormal HR: use correction formula

21
Q

What leads show the inferior surface of the ventricles?

A

2,3, aVF

22
Q

What leads show the ventricular septum?

A

V1, V2

23
Q

What leads show the anterior surface of the ventricles?

A

V3, V4

24
Q

What leads show the right ventricle and septum?

A

V1, V2, aVR

25
Q

What leads show the apex and anterior surface of the ventricles?

A

V3, V4

26
Q

What leads show the lateral surface of the ventricles?

A

1, aVL, V5, V6

CVS Lecture Reviews (9 decks)

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