okay delirium......I pulled out my old cardiac book and EKG index cards, and in a nutshell....it says that Sinus Tach can go as high as 200 BPM. Possible causes are a possible normal response to demand for increased oxygen during fever, stress, pain, and dehydration. Can also be caused by caffeine, nicotine, or alcohol ingestion. They treated your ST with all the appropriate meds, and ordered the appropriate test and follow-up according to my books here.
As for your EKG showing elevated ST waves....those are usually seen in pericarditis, myocarditis, left ventricular hypertrophy, pulmonary emboli, and electrolyte disturbances and secondary to medications that alter depolarization and repolarization. May indicate myocardial ischemia or injury (must also be associated with patient's clinical presentation).
Well.....that's all I know about this. Back in the day when I worked cardiac, I knew a lot more, then I switched to babies and pedi tykes......and haven't worked as a nurse in five years.....so I don't think I qualify to expound on anything further than what I found in my cardiac books. Hope someone else comes along with some answers for you, and hope nothing I wrote here scares the beegeebees out of you. :kiss