12-Lead ECG

Question 1

What are the four STEMI mimics?

Answer 1

-LBBB
-BER
-Pericarditis
-LVH

Question 2

What are the characteristics of a LBBB?

Answer 2

-QRS >120ms
-Prominent S wave in V1-V3
-Prominent R wave is V5,V6,1,AVL
-ST elevation common in V1-4

Question 3

What are four characteristics for BER?

Answer 3

-Widespread Concave ST elevation
-Osbourne wave
-No reciprocal changes
-ST changes are stable over time.

Question 4

What are four characteristics of pericarditis?

Answer 4

-Widespread concave ST elevation
- PR depression
-Reciprocal ST depression and PR elevation in AVR
-Sinus tachycardia

Question 5

What are characteristics of LVH/ requirements

Answer 5

S (v1 or V2) + R (V5 and V6) >35mm

Question 6

STEMI requirements by age

Answer 6

-Men <40 2.5mm in V2-3 and 1mm in all other leads
-Men >= 40 2mm in V2-3 and 1mm in all other leads
-Women: 1.5mm IN v2-3 AND 1mm in all other leads.

Question 7

Characteristics of an aVR stemi

Answer 7

-Widespread horizontal ST depression
-ST elevation in aVR >1mm
-ST elevation in aVR is greater than V1
-Cannot be diagnosed in presence of tachycardia

Question 8

Normal ECG intervals

Answer 8

-R-R: 0.6 to 1.2 seconds
-P wave: 80 milliseconds
-PR interval: 120-200 milliseconds
-PR segments: 50-120 milliseconds
-QRS complex: 80-100 milliseconds
-ST segment: 80-120milliseconds
-T wave 160milliseconds