In my opinion the highest troponin level reached after myocardial infarction is the one reported by New Enland Journa Medicine : 28.47 ng/ml. See the enclosed peper,
Rise of troponin after myocardial ischaemia has got prognostic value. I know a case report published in 2010 journal of medical case reports..A patient of myocardial infarction with PTCA stenting who has had of troponin I up-to 515ng/dl 6 hour after intervention. Patient was probably a cocaine addict. He had severe LV dysfunction and survived after prolonged inotropic support andIABP.