I have answered this twice already, not realizing that I had to be a
member of the group to reply, so those messages are forever lost in
cyberspace. Those flattened T waves, if looked at without other
presenting factors are not that significant. They can mean many things.

Ischemia - Doubtful, as V1 and V2 look at the right side , V3 and V4
at the anterior wall, and V5 and V6 at the left side. So that for you
to have flattened to waves in all 6 makes it very unlikely that
ischemia is the problem.

hyperventilation - I doubt if you were hyperventilating during your EKG.

Digitalis - Do you take that?

Pulmonary Embolus - You would have other symptoms, ie chest pain and
shortness of breath.

pericarditis - Again you would have had symptoms other than EKG changes.

Interventricular conduction delays ie: LBBB: Doubtful as other EKG
signs would have shown up.

Gulping Ice Water - Doubtful

Electrolyte imbalance - Most likely. Hypokalemia - check potassium

pam