ECG

Question 1

What is an ECG?

Answer 1

An electrocardiogram

Question 2

What is the normal speed for an ECG?

Answer 2

25mm/sec

Question 3

What is the size of each big square?

Answer 3

0.2sec

Question 4

What is the size of each small square?

Answer 4

0.04sec

Question 5

How do you calculate heart rate?

Answer 5

divide 300 by the number of heart beats

Question 6

Where do you place chest leads?

Answer 6

V1 - Right sternal edge, 4th intercostal
V2 - Left sternal edge, 4th intercostal
V3 - Half way between V2 and V4
V4 - 5th intercostal space, mid clavicular line
V5 - Anterior axillary line
V6 - Mid axillary line

Question 7

What are the signs of bundle branch block on an ECG

Answer 7

Prolonged QRS >0.12sec
WiLLiaM - Left bundle branch block W shape in V1 and M shape in V6
MaRRoW - Right Bundle branch block M shape in V6 and M shape in V1

Question 8

What does the P-wave represent?

Answer 8

Atrial depolarisation

Question 9

What does the QRS complex represent?

Answer 9

Ventricular depolarisation

Question 10

What does the T wave represent?

Answer 10

Ventricular repolarisation

Question 11

Why do you not see any Atrial repolarisation?

Answer 11

It is hidden in the QRS complex.

Question 12

When is ventricular systole?

Answer 12

Q-T interval

Question 13

When are the two heart sounds made?

Answer 13

Lub - QRS

Dub - T wave

Question 14

What can cause low voltage QRS?

Answer 14

Hypothyroidism

COPD

Question 15

In posterior MI what would you see and on what leads?

Answer 15

ST depression in V1 V2 and V3

Question 16

What can deviate the axis of an ecg to the left or right?

Answer 16

LVH/RVH
WPW
Dextrocardia
PE
MI