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The QT interval is a measurement made on an electrocardiogram used to assess some of the electrical properties of the heart.It is calculated as the time from the start of the Q wave to the end of the T wave, and approximates to the time taken from when the cardiac ventricles start to contract to when they finish relaxing.
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once every 2 weeks qAc Before every meal (from Latin quaque ante cibum) q.a.d. every other day (from Latin quaque altera die) QALY: quality-adjusted life year: q.AM: every day before noon (from Latin quaque die ante meridiem) q.d. every day (from Latin quaque die) q.d.s. four times each day (from Latin quater die sumendus) q.h.
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Long QT syndrome (LQTS) is a condition affecting repolarization (relaxing) of the heart after a heartbeat, giving rise to an abnormally lengthy QT interval. [7] It results in an increased risk of an irregular heartbeat which can result in fainting, drowning, seizures, or sudden death. [1]
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The first report of short QT syndrome to be published was in 2000, describing a family with short QT intervals on the 12-lead ECG, atrial fibrillation occurring at a young age, and an unrelated patient who had a sudden cardiac death associated with a short QT interval. [2] [4] The association between short QT and sudden cardiac death was ...
The QTc interval is longer in females, as well as having a stronger response to IKr-blocking agents. In males, the presence of testosterone upregulates IKr channels and therefore decreases QT interval. [2] Stated otherwise, estrogens prolong the QT interval, while androgens shorten it and decrease the response to IKr-blocking agents. [citation ...