Cardiology - ECG Rules

Question 1

Wpw

Answer 1

• Delta wave AND shortened PR interval
• usually presents in teenagers
• nothing that slows the av node otherwise uses the accessory pathway

Question 2

Acute MI

Answer 2

• Hyperacute T waves -> elevate ST segments-> T wave inversion -> Q waves. And repeat every 20 mins x 2 hrs if normal at first.
• The ST elevation needs to be >0.1 mV in >=2 contiguous leads
• OR a new LBBB (obscures usual ST-segment analysis)

Question 3

Pericarditis

Answer 3

• PR depression

- ST elevation in V2-V6

Question 4

Lead –> Location

Answer 4

• V2, V3, V4: anterior, LAD
• II, III, avF: inferior leads, RCA
• I, avL, V5, V6: lateral, LCX

Question 5

Inferior MI

Answer 5

• Often see sinus brady bc RCA supplies SA node
• Doesn’t usually require tx unless hypotension.
• If rate is slow enough to cause dec CO + BP, then give IV atropine.

Question 6

Hyper/ hypo K

Answer 6

HyperK: peaked T waves, flat P waves, prolonged PR + QRS, sine wave + brady if severe.

HypoK: dec T wave, U wave