ECG Yr1 Revision

Question 1

Answer 1

Answer: Anterior-septal wall MI

• Occlusion of the left coronary artery—left anterior descending branch
• ECG changes: pathological Q waves; absence of normal R waves in leads V1 and V2

Question 2

Answer 2

Answer: Inferior MI

• Occlusion of the right coronary artery—posterior descending branch
• ECG changes: ST segment elevation in leads II, III, and aVF

Question 3

Answer 3

Answer: Left axis deviation

Question 4

Answer 4

Answer: V5-6, I and aVL

The circumflex artery supplies the posterior and lateral walls of the left ventricle and thus ECG changes manifest in V5-6, I and aVL.

Question 5

Answer 5

Answer: 50bpm

Question 6

Answer 6

Answer: Lateral wall MI

• Occlusion of the left coronary artery—circumflex branch
• ECG changes: ST segment elevation in leads I, aVL, V5 , and V6

Question 7

Answer 7

Answer: V1-V4

Question 8

Answer 8

Answer: Sinus rhythm

Question 9

Answer 9

Answer: 150bpm

Question 10

Answer 10

Answer: QRS complex: Phase 0 of the ventricular action potential

Question 11

Answer 11

Answer: Lateral

Question 12

Answer 12

Answer: <0.12s

Question 13

Answer 13

Answer: 180ms

Question 14

Answer 14

Answer: It will increase the amplitude of the QRS complex

Question 15

Answer 15

Answer: ST segment

Calcium is entering the cell during the plateau phase - > ST segment

Question 16

Answer 16

Answer: Irregularly irregular

Question 17

Answer 17

Answer: 0.12-0.20s

Question 18

Answer 18

Answer: Anterior MI

• Occlusion of the left coronary artery—left anterior descending branch
• ECG changes: ST segment elevation with tall T waves and taller-than-normal R waves in leads V3 and V4

Question 19

Answer 19

Answer: II, III and aVF

Question 20

Answer 20

Answer: Anterior wall MI

Question 21

Answer 21

Answer: Inferior

Question 22

Answer 22

Answer: Extreme right axis deviation

Extreme right axis deviation is indicative of the heart depolarizing in retrograde fashion. This implies that the electrical impulse originated within the ventricular myocardium and travels upwards and deoplarizes the atria after the ventricles.

Question 23

Answer 23

Answer: 350-450ms

Remember the QT interval is inversely proportional to heart rate, therefore as the rate increases, the QT shortens.

Question 24

Answer 24

Answer: U wave

Question 25

Answer 25

**Answer: 0.2 seconds and 0.5mv amplitude** ## Footnote This is of course assuming the paper speed is 25mm/sec & the gain (or amplitude setting) is 10mm/mV.

Question 26

Answer 26

**Answer: 0.08-0.12s**

Question 27

Answer 27

**Answer: Normal**

Question 28

Answer 28

**Answer: 85bpm**

Question 29

Answer 29

**Answer: Right axis deviation**

Question 30

Answer 30

**Answer: 100 beats/min**

Question 31

Answer 31

**Answer: positive**

Question 32

Answer 32

**Answer: 5th intercostal space**

Question 33

Answer 33

**Answer: Conduction through the AV node**

Question 34

Answer 34

**Answer: isoelectric**

Question 35

Answer 35

**Answer: Right axis deviation**

Question 36

Answer 36

**Answer: 0.6-1.0 seconds**

Question 37

Answer 37

**Answer: left arm, right arm, left leg**

Question 38

Answer 38

**Answer: SA node - AV node - Bundle of His - Left and right bundle branches - Purkinje fibres**

Question 39

Answer 39

**Answer: Atrial depolarisation**

Question 40

Answer 40

**Answer: 0.04 seconds**

Question 41

Answer 41

**Answer: Left axis deviation**

Question 42

Answer 42

**Answer: between -30° and +90°**

Question 43

Answer 43

**Answer: Ventricular depolarisation**

Question 44

Answer 44

**Answer: 300**

Question 45

Answer 45

**Answer: Normal axis**

Question 46

Which is the correct Einthoven's triangle?

Answer 46

A

Question 47

Answer 47

**Answer: Time between heart beats**

Question 48

Answer 48

**Answer: 0.12-0.20 seconds**

Question 49

Answer 49

**Answer: Ventricular repolarisation**

Question 50

Answer 50

**Answer: 300 / number of large squares in between each consecutive R wave**

Question 51

Answer 51

**Answer: 0.2 seconds**

Question 52

Answer 52

**Answer: 5**

Question 53

Answer 53

**Answer: Ventricular depolarisation and repolarisation**

Question 54

Answer 54

**Answer: +30 degrees**

Question 55

Answer 55

**Answer: 80ms**

Question 56

Answer 56

**Answer: Inferior**

Question 57

Answer 57

**Answer: Acute anterolateral MI**

Question 58

Answer 58

**Answer: aVF**

Question 59

Answer 59

**Answer: Septal**

Question 60

Answer 60

**Answer: Anterior**

Question 61

Answer 61

**Answer: 0.08 sec**

Question 62

Answer 62

**Answer: Right axis**

Question 63

Answer 63

**Answer: V6**

Question 64

# Choose the ECG that matches the following criteria: * Rate: Ventricular 150bpm, atrial 280bpm * Rhythm: Regular * P waves: Flutter waves * PR Interval: Variable * QRS: 0.08 seconds

Answer 64

**Answer: Option C**

Question 65

Answer 65

**Answer: Normal**

Question 66

Answer 66

**Answer: ECG leads are not correctly placed.**

Question 67

Answer 67

**Answer: Normal axis**

Question 68

Answer 68

**Answer: Lateral**

Question 69

Answer 69

**Answer: Left anterior descending coronary artery**

Question 70

Answer 70

**Answer: A P-wave precedes each QRS-complex**

Question 71

Answer 71

**Answer: 100bpm**

Question 72

Answer 72

**Answer: +90 degrees**

Question 73

Answer 73

**Answer: 490ms** ## Footnote The QT interval is defined from the beginning of the QRS complex to the end of the T wave. The QT interval should be measured in either lead II or V5-6

Question 74

Answer 74

**Answer: -30 degrees to +90 degrees**

Question 75

Answer 75

**Answer: Leads II, III and aVF**

Question 76

Answer 76

**Answer: Right axis**

Question 77

Answer 77

**Answer: Acute inferior MI**

Question 78

Answer 78

**Answer: 220ms** ## Footnote 5.5 small squares \* 40 ms = 220ms

Question 79

Answer 79

**Answer: 340ms**

Question 80

Answer 80

**Answer: Acute anteroseptal MI**