Welcome to HCM,
After going through your history,our presurgical check showed abnormal EKG it is not clear that is it old infarct or S T segment and T wave
If there are ST and T wave changes then after examination by Cardiologist.
Tests like Echocardiography
and if required TMT may be performed to know any significant Coronary disease is there or not.
Future action depends on result of these investigation result.
If You have Old silent infarct then a 2 D Echocardiography will be able to identify and may be coronary angiography
is required to detect lesions but this is less likely.
Hopefully everything comes finre and then your surgery may be performed.
Please take care
Dr.Akhilesh Dubey M.D.