ECG: Differentials

Question 1

Short PR interval

Answer 1

• Lown–Ganong–Levine syndrome (LGL) is a pre-excitation syndrome of the heart due to abnormal electrical communication between the atria and the ventricles.

Question 2

Long PR interval

Answer 2

Question 3

Wide P wave

Answer 3

LAE

Question 4

Tall P wave

Answer 4

RAE

Question 5

Pathological Q waves

Answer 5

Question 6

Large R or S waves

Answer 6

Question 7

Small QRS complexes

Answer 7

Question 8

Wide QRS complexes

Answer 8

Question 9

Abnormal shaped QRS complexes

Answer 9

Question 10

ST segment elevation

Answer 10

Question 11

ST segment depression

Answer 11

Question 12

J waves present

Answer 12

Hypothermia

Question 13

Diffuse J point

Answer 13

Early repolarization, LVH with strain, pericarditis, acute MI

Question 14

Short QTc interval

Answer 14

Question 15

Long QTc interval

Answer 15

Question 16

Tall T waves

Answer 16

Question 17

Small T waves

Answer 17

Question 18

Inverted T waves

Answer 18

Question 19

Prominent U waves

Answer 19

• • Hypokalemia
• • Hypercalcemia
• • Hyperthyroidism