What causes ecg to read myocardia ishemia. i had a emergency heart cather done but it can back good.

Many things.: Ekg's are an imperfect tool. Sometimes it looks like heart disease when it is not. Such is your case.

Patterns: The st segment of the ekg might be depressed or t wave inverted as two common indicators of ischemia. Particularly in the setting of chest pain, must be assumed to be correct and seek source (=cath). While a big procedure, still better to do and be negative than not and risk loss of % of heart muscle function, particularly if at 26 yo.