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ST Depression normal?

Recently had a holter monitor for 18 hours, showed Tachycardia and one ST Depression - 1.5mm is this normal?
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MEDICAL PROFESSIONAL
Hi, usually the reciprocal leads are involved. The ST segments should not be more than 1 mm above or below the baseline. With a full-thickness infarct there may be ST depression over the reciprocal leads.  ST depression ≥ 1 mm is significant. But a single finding may not be significant, but please check with your doctor. Regards.
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Thank you.  I did a stress ECG and there were a lot more ST Depressions.  Thank you for your advice.
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