Many things: including nothing. Depends on the pattern of the depression (up-sloping or down-sloping) and the exact amount of the depression in millimeters. The doctor who ordered the ECG is in the best position to interpret it. It can be a normal variant, or it can be evidence of a lack of blood flow (ischemia) in that part of the heart. Also depends on your cardiac history. Call your doctor to explain.
Answered 7/17/2017
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