I'm no expert in ECG's by any means, but the the ekg2 was circled for the bunnyears, which means from my VERY noobile understanding of ECG's is that there is something messed up with the perkinje fibers and the ventricles are depolarizing at messed up times, either that or their is a rerouting in the nerve pathways.... Up means an electrical signal + going towards the lead, - means away.
leads 1 2 3,
AVR AVF AVL, and
v1 v2 v3 v4 v5 v6
are all basically looking at the same thing from different angles, 1 2 3 and like the basic 3 leads, avr avf avl look at kind of the same thing but they are altered slightly ( i forget what the A stands for, i'm such a noob)
and v1 v2 v3 v4 v5 v6 are looking at the various angles of the heart mostly from the left side. its kind of a way to triple check to make sure, and if you have a really good understanding of 12 leads / 15 leads you can discern which artery it is in.
the ECG 1 I believe the handwriting is your questions?
the significant thing there is the ST depression after the QRS complex, which is indicative of non acute heart tissue ischemia, which essentially means that the person HAD a heart attack, and thats symbolizing the permanent damage, where as ST elevation is ACUTE ischemia, which means the heart attack is happening right now. I'm not cardiologist but as to the QRS spike question, I do not believe there is any significance regarding the HEIGHT of a qrs complex, but rather how far away the P wave is, how wide the QRS complex is, rabbit ears, ST elevation / depression etc.
do not expect to figure out 12 lead ecg's or just regular ecg's with a couple of go's at it, its definitely not an over night learning experience. And if you ask any truely GOOD medical professional who is excellent at interpreting them, most of them will say that they are still learning ECG's lol.
If you're really interested, I recommend buying a book, preferably written by a cardiologist / emerg doctor.
