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If the depression of (2 mm) is used as a criterion the number of false positives is greatly reduced, BUT the number of false negatives results increase.
The cardiologist made a decision based on the 1 mm depression criterion with fewer false negatives with the EKG.
An EKG is not very reliable for a dx, but a cath is more reliable (but not 100%) and would almost always rule out ischemia (blocked vessels). However, you do have the symptoms (angina) that can be related to a heart condition, and you should get another opinion...you shouldn't ignore the pain!