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20 Possible Causes for Borderline Prolonged QT Interval

  • Long QT Syndrome 14

    Diagnosis of LQTS can be very difficult, since up to one-third of affected patients may have normal or only borderline prolonged QT intervals.1-3 Each of the different genetic[eplabdigest.com] However, in some cases a borderline prolonged QT interval is seen.[aafp.org] QT interval at rest and QT prolongation and syncope after exercise). 70 More recent studies have shown that mutation location and type influence the variability of symptoms[jstage.jst.go.jp]

  • Long QT Syndrome 10

    Diagnosis of LQTS can be very difficult, since up to one-third of affected patients may have normal or only borderline prolonged QT intervals.1-3 Each of the different genetic[eplabdigest.com] However, in some cases a borderline prolonged QT interval is seen.[aafp.org] QT prolongation is characteristic, with a QTc greater than 440 msec in men and greater than 460 msec in women ( Figure 2 ).[aafp.org]

  • Long QT Syndrome

    However, in some cases a borderline prolonged QT interval is seen.[aafp.org] […] different but borderline the QT went down in all the normals but less than the RR interval therefore the QTc goes up slightly. the QT of those with LQTS didn’t change at[emergencymedicineireland.com] QT prolongation is characteristic, with a QTc greater than 440 msec in men and greater than 460 msec in women ( Figure 2 ).[aafp.org]

  • Long QT Syndrome 13

    However, in some cases a borderline prolonged QT interval is seen.[aafp.org] Long QT refers to the QT-interval measured on the electrocardiogram as being prolonged. The "corrected" QT-interval (QTc) is adjusted for heart rate.[briannabadger.com] However, there are some QT intervals that are at the borderline duration that still may be considered normal.[chop.edu]

  • Long QT Syndrome 6

    However, in some cases a borderline prolonged QT interval is seen.[aafp.org] Long QT syndrome patients with normal to borderline prolonged QTc intervals are at risk for syncope, cardiac arrest and sudden death.[springerlink.com] Exercise testing has been shown to be useful in the diagnosis of LQTS in asymptomatic patients with borderline or normal QT interval.[radcliffecardiology.com]

  • Generalized Motor Seizure

    Chauhan VS, Krahn AD, Klein GJ et al. (2004) Utility of a simplified lidocaine and potassium infusion in diagnosing long QT syndrome among patients with borderline QTc interval[link.springer.com] prolongation.[link.springer.com] Chauhan VS, Krahn AD, Mitoff P et al. (2004) Sudden intense exercise increases QT heart rate slope and T wave complexity in long QT syndrome and normal subjects.[link.springer.com]

  • Torsades De Pointes

    (ms) Normal Borderline 440-460 430-450 450-470 Prolonged (top 1%) 460 450 470 QT C corrected QT interval which corrects for heart rate.[medsafe.govt.nz] Table 1: QTC values for normal and prolonged QT interval after correction with Bazett's formula 3 QT c values by Age and Sex (ms) 1-15 years (ms) Adult males (ms) Adult females[medsafe.govt.nz]

  • Catecholaminergic Polymorphic Ventricular Tachycardia Type 2

    The QT interval can be borderline prolonged in some patients. The heart rate can be lower than normal, especially in the male sex.[symptoma.com] The resting ECG is usually normal, and the QT interval is usually normal or borderline, making diagnosis difficult.[doi.org] The resting ECG is also normal, as is the QTc interval. In some cases, an abnormal u wave regarding amplitude or shape can be noticed.[symptoma.com]

  • Gitelman Syndrome

    QT interval prolongation.[joacp.org] Electrocardiography (ECG) showed sinus bradycardia with heart rate 44/min, QT interval 534 ms and corrected QT interval (QTc) 457 ms (“borderlineQT prolongation) [Figure[joacp.org] […] alkalosis along with hypomagnesemia and hypocalcinuria. [1] Hereby, we describe perioperative management of a 27-year-old female with GS presented for temporary ileostomy with “borderline[joacp.org]

  • Sinus Bradycardia

    In few cases, pure citalopram overdose at doses above 600 mg showed electro-cardiographic changes with prolonged QT intervals and sinus bradycardia gradually resolving within[ncbi.nlm.nih.gov] We report on a 32-year-old patient with borderline personality disorder (BPD) who ingested a total of 800 mg citalopram to attempt suicide due to an interpersonal disappointment[ncbi.nlm.nih.gov]

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