HomeAnswersCardiologyqt prolongationIs an isolated slight elongation in QT intervals on one ECG, followed by normal QT intervals on previous and subsequent ECGs, a cause for concern?

What could be the reason for a prolonged QT?


The following is an actual conversation between an iCliniq user and a doctor that has been reviewed and published as a Premium Q&A.

Medically reviewed by

iCliniq medical review team

Published At November 8, 2023
Reviewed AtNovember 24, 2023

Patient's Query

Hello doctor,

I would really appreciate some advice on what to do. I am a 31-year old-female. About four months ago, I started experiencing bad anxiety and panic attacks. I went to a doctor for blood tests and ECG, just to rule out any health issues. In fact, I had two ECGs done three months ago. The first one was perfectly normal. The second one was done two weeks later. When my doctor got the results of the second ECG, he asked me if I was taking any medication. I said no and enquired about the reason for his question. He told me that my QTC interval was a little long on my recent ECG. He compared the two ECGs and told me he was not concerned at all. He has reassured me over and over again that I do not have LQTS (long QT syndrome) and that the QTC interval was just slightly longer on the second ECG. I want to believe him but I am so scared of possibly having it. I had an ECG done right after that, and it was fine. Should I get another ECG done? Or see a cardiologist or just believe my doctor? Please help.

Thank you.


Welcome to icliniq.com.

I understand your concern.

How much was QTC? Diagnosis of long QT is not a difficult one, so if he is saying it is within the normal limits, then it may be. Slight variations in the QTC may occur from time to time with changes in the heart rate. If both of your QTC are normal (that is, less than 470 msec), then no need to worry. However, it is better if you could upload both your ECGs so that I can calculate the QTC.

I hope this information will help you.

Please revert in case of more queries.

Thank you.

Same symptoms don't mean you have the same problem. Consult a doctor now!

Dr. Sagar Ramesh Makode
Dr. Sagar Ramesh Makode


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