ECG changes with ischaemia and which coronary arteries are effected

Question 1

what ecg changes are seen in ischaemia

Answer 1

normal ECGs have p waves, qrs complexes and t waves.
p waves atrial depolarisation, qrs complexes represent ventricular depolarisation and st segments ad t waves represent repolarisation. when looking for ischaemic changes on an ecg you look for st segment changes particularly depression and t wave changes such as flattening and inversion, but also wide base, tenting and hyper acute (tall) t waves.

Question 2

ECG changes depending on which coronary artery is involved

Answer 2

the pattern of the leads involved allow us to work out which part of the heart muscle is ischaemic and which are coronary arteries are affected.

Question 3

Anterior wall ischaemia

Answer 3

Leads V2 to V4
Left anterior descending artery

Question 4

lateral wall ischaemia

Answer 4

I, aVL , V5, V6
Circumflex artery

Question 5

Inferior ischaemia

Answer 5

II, III, aVF
Right coronary artery
Posterior descending branch

Question 6

Posterior Ischaemia

Answer 6

V1 to V4
left coronary artery circumflex branch
right coronary artery posterior descending branch