ECGs

Question 1

Normal calibration for paper speed and voltage

Answer 1

Speed: 25mm/sec
Voltage: 10mm/mv

Question 2

1 large square equates to what time period

Answer 2

0.2 seconds

Question 3

How to calculate HR on ECG

Answer 3

Regular - 300/ R-R interval large squares

Irregular - 10 sec rhythm strip QRS x 10

Question 4

Describe axis interpretation

Answer 4

Correlation between 1 and AVF

Question 5

Normal intervals
PR
QRS width
QTc

Answer 5

PR 120-209
QRS 70-100
QTC 350 - 440 (Male) or 460 (Female)

Question 6

Describe first degree heart block

Answer 6

PR interval greater than 200ms
(5 small squares)

Question 7

Describe second degree heart block type 1

Answer 7

Progressive prolongation or PR interval until non-conducted p wave

Question 8

Describe second degree heart block type 2

Answer 8

PR interval regular, intermittent non-conducted p wave

Question 9

Describe third degree heart block

Answer 9

Complete AV dissociation, independent atrial and ventricular rates

Normally shocked (cardiogenic)

Question 10

Describe ECG findings of a PE

Answer 10

Sinus tachy
Inverted anterior T waves
S1Q3T3
Anterior depression

Right sided heart strain (echo)

Question 11

Describe different locations of a 12 lead ECG with corresponding effected vessel

Answer 11

Anterior = V1, V2, V3, V4
Lateral = V5, V6
High lateral = 1, AVL
Inferior = 2, 3, AVF
Posterior = v7, v8, v9

Question 12

When would you consider a posterior ecg

Answer 12

Anterior depression, ? Posterior stemi
(Lower voltage to diagnose as more tissue)

Question 13

When would you consider right sided EXG

Answer 13

Inferior stemi, to determine right ventricular involvement = low preload and no nitrates