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Circ J. 2015;79(2):318-24. doi: 10.1253/circj.CJ-14-1028. Epub 2014 Dec 5.

T-wave variability for the prediction of fast ventricular arrhythmias – prospective, observer-blind study.

Author information

1
Department of Internal Medicine II, Division of Cardiology, Medical University of Vienna; Ludwig Boltzmann Cluster for Cardiovascular Research, Austria.

Abstract

BACKGROUND:

The clinical value of T-wave variability (T-var) for ventricular arrhythmia (VA) risk prediction was evaluated.

METHODS AND RESULTS:

Three 20-min Holter-ECG-based T-var measurements (I1 at baseline, I2 after 6.5 ± 1.6 months and I3 after 13.1 ± 2.0 months) were done in 121 patients. T-var was defined as the amplitude variability of the T-wave with the maximum of T-wave oscillation. The endpoint was a fast, potentially fatal VA (>240 beats/min). During follow-up (20 ± 4 months) 20/121 patients (55% ischemic heart disease, 15% preserved left ventricular ejection fraction [LVEF]) had fast VA terminated by ICD or external shock. Although T-var did not differ between patients with vs. without fast VA at baseline (I1: 10.7 ± 7.3 µV vs. 7.8 ± 4.1 µV, P=0.170), patients with fast VA had higher T-var compared to those without fast VA at 2 subsequent measurements (I2: 14.0 ± 6.5 µV vs. 8.2 ± 3.6 µV, P=0.030; I3: 17.0 ± 5.4 µV vs. 8.8 ± 4.6 µV, P=0.004). The increase in T-var between I1 and I2 was higher in patients with fast VA (∆T-var=7.0 ± 9.3 µV), as compared to patients without (∆T-var=0.4 ± 4.3 µV). After adjustment for LVEF in a multiple logistic regression model, the odds ratio for developing fast VA was 1.1 (P=0.056) for each 1-µV increment in T-var at I1.

CONCLUSIONS:

T-var is elevated in patients with fast VA, and both elevation of T-var and increase in T-var may complement LVEF in VA risk stratification.

PMID:
25482297
DOI:
10.1253/circj.CJ-14-1028
[Indexed for MEDLINE]
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