Dispersion of QT interval in premature ventricular beats is not an independent marker for inducible sustained ventricular tachycardia

Abstract

Keywords

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Ventriküler prematüre atımların QT interval dispersiyonu indüklenebilir sürekli ventriküler takikardi için bağımsız bir gösterge değildir

Abstract

Amaç: 12 derivasyonlu EKG nin farklı derivasyonları arasında QT interval süresinde değişkenlik birçok klinik durumda ventriküler aritmiler için bir risk göstergesi olarak öngörülürken, QTd-V nin değeri henüz açık değildir. Çalışmanın amacı reentran ventriküler takiaritmilere (VT) duyarlılığı olan hastaları belirlemede ventriküler premature atımlarda QT dispersiyonu’nun (QTd-V) değerini araştırmaktır. Gereç ve Yöntem: Elektrofizyolojik çalışma yapılmış 34 hastada indüklenebilir VT nin tahmini için prekordiyal QTd-V, sinyal ortalamalı EKG de geç potansiyeller ve azalmış sol ventrikül ejeksiyon fraksiyonu karşılaştırıldı. Bulgular: İndüklenebilir VT li 12 hastadaki QTd-V (110±50 msec) VT nin indüklenemediği 22 hastadaki QTd-V den (65±38 msec, p=0.006) daha büyük bulundu. Ejeksiyon fraksiyonu ve geç potansiyel varlığının dahil edildiği çok değişkenli analiz QTd-V nin ventriküler takiaritmilere duyarlı hastaları belirlemede bağımsız bir faktör olmadığını gösterdi. Sonuç: Artmış QTd-V tek başına reentran ventriküler takiaritmilere duyarlılıkla ilintili olsa da, geç potansiyeller ve sol ventrikül ejeksiyon fraksiyonu hesaba katıldığında ilave tanısal bilgi sağlamadığı gözükmektedir.

Keywords

• QT dispersiyon, ventriküler prematüre atım, elektrofizyolojik çalışma

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