I'm a 26-year old woman and I'd need some advice regarding my QT values. If I understand correctly, QTc intervals of less than 440 Ms. are considered to be normal, whereas QTc intervals of 440 Ms. to 460 Ms. in men and 440 Ms. to 470 Ms. in women are considered borderline. A couple of days ago I had an ECG. My QT/QTc was 412/447 Ms. at a heart rate of 71 bpm. Is this something to worry about (long QT syndrome)? I've been suffering from PVCs every day for over a year, but my heart should be structurally fine according to an echocardiogram. During the past few months I have had short bursts of an accelerated heartbeat with fluttering sensation and sometimes irregular heartbeat. I've decided to have 24-hour Holter monitoring again, just in case.

Dr. Sameer MehrotraCardiologist21yrs exp

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Hi lybrate-user, your qtc is within normal limits for women. But in patients who have QT prolongation, this at times gets precipitated by certain triggers. Since you have mentioned that you are having PVC's, then few things become important - What is the percentage of PVC load you have in 24 hrs (the holter will tell you that) 2. What is the cause of these PVC and whether the fluttering feeling you are experience is some abnormal rhythm. A holter will be able to tell this only if these things happen during the time of holter monitoring. A better way can Electrophysiology study, where we do detailed study of your heart's conduction system and see if at all any abnormal beats or rhythms are coming and where they are coming from and give you a definitive answer. So, you should consult a cardiac electrophysiologist with your present and past ECG and holter reports.  

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