ST segment

Question 1

how to measure ST

Answer 1

start of S to start of T

Question 2

what is ST

Answer 2

time from end of ventricular depolarisation to the start of ventricular repolarisation (usually isoelectric)

Question 3

abnormal ST

Answer 3

elevation >2mm (in two adjacent chest leads) elevation >1mm (in two adjacent limb leads = INFARCTION) depression = ischaemia (will be small at rest and larger during exercise)

Question 4

what is the T wave

Answer 4

ventricular repolarisation

Question 5

normal T wave

Answer 5

VR - inverted V1 - inverted (V2 - inverted in the young)

Question 6

abnormal t wave

Answer 6

if inverted in I, II, and v4-v6 this could be ischaemia or infarction

Question 7

digitalis / digoxin effect on T wave

Answer 7

causes T wave inversion and ST segment sloping depression

Question 8

Answer 8

digoxin effect on T wave