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QTC is not a standard medical abbreviation. Is this related to the heart?
If so, it may refer to a specific pattern on an EKG.
Many people with mild QT interval prolongation, don't have any symptoms at all.
The QT interval refers to the recovery of the part of the heart called the ventricle in preparation for receiving the next beat which starts in the part of the heart called the atrium.
Before I get into more explanation of this, please REPLY so that we can clarify what QTC may refer to in your situation.
If this was a result of a heart evaluation, your doctor may be talking about a long QT interval. If that is what this is about, here is an excellent review article of the condition:
If this isn't what your doctor was talking about, please REPLY and let me know what symptoms you were having and the types of tests done so that I can figure out what your doctor was actually referring to.
I want to be sure you have the most helpful information for your situation.