Basis to ECG

Question 1

We measure electrical gradient and vectors with respect to the ________ (positive/negative) electrode.

Answer 1

Positive

REMEMBER: The electrical wave moves from positive to negative

Question 2

A pair of elctrodes on the body surface, called leads, can detect, the ___________.

Answer 2

Electrical front wave

Question 3

Precordial leads

Answer 3

V1-V6

Question 4

Augmented leads

Answer 4

AvL, AvR, AvF

Question 5

Locations of the precordial leads

Answer 5

V1: right of sternum in 4th intercostal space

V2: Left of sternum in 4th intercostal space

V3: Between V2 and V4

V4: Mid clavicular line in 5th intercostal space

V5: Between V4 and V6

V6: Mid-axillary line

Question 6

Which repolarizes first the epicardium or the endocardium?

Answer 6

Epicardium

Question 7

PR segment

Answer 7

All ventricular mass is at rest

Question 8

ST segment

Answer 8

Entire ventricular mass is depolarized

Question 9

TP segment

Answer 9

All of ventricular mass is reporalized