ECG

Question 1

U waves

Answer 1

Hypokalemia

Question 2

What U waves look like?

Answer 2

Like a second T wave
U wave is usually in the same direction as the T wave.
U wave is best seen in leads V2 and V3.

U -wave size is inversely proportional to heart rate: the U wave grows bigger as the heart rate slows down
More promininet U waves in bradycardia, slow heart rate

Due to delayed repolarization of some purkinjee fibres or myocardial cells.

Question 3

J wave

Answer 3

Hypothermia
At J point (where s ends)
An extra wave is present

Question 4

Prolonged QT

Answer 4

Hypocalcemia

Risk of torsades de pointes (defib)

Question 5

Short QT

Answer 5

Hypercalcemka

Question 6

Short QT

Answer 6

Hypercalcemka

Question 7

Delta wave

Answer 7

Best seen in lead ll
Wolf parkinsons white syndrome

Question 8

Atrial flutter

Answer 8

Best seen in ll, lll,avf

Question 9

Normal Chest leads and limb leads

Answer 9

Chest leads V1- V6 -

Limb leads, l,ll,lll, avr, avL, avf

Question 10

Amplitude of R and S waves in normal chest leads

Answer 10

From V1 to V6
progressive R wave,
regressive S wave

Question 11

Inferior leads

Answer 11

2,3,avf
Covered by RCA

Question 12

Lateral leads

Answer 12

l , aVL, V5, V6
Supplied by LAD and Left circumflex artery

Question 13

Anterior leads

Answer 13

V3-V4
LAD artery

Question 14

Septal leads

Answer 14

V1- V2
LAD

Question 15

How to detect ishaemic changes in LBBB

Answer 15

Look for ST depression and ST elevation (with respective ST depression) very closely.
Especially when there is history of typical chest pain.
You want to especially look into limb leads because they will give a clue