Long-term Non-Invasive ECG-based Risk Stratification of Sudden Cardiac Death: Extended 5-year Results

Elena Okisheva, Dmitry Tsaregorodtsev, Vitaly Sulimov

Abstract


Objectives: To evaluate predictive value of heart rate turbulence (HRT), deceleration capacity (DC) and microvolt T-wave alternans (mTWA) for risk stratification for sudden cardiac death (SCD) in patients after myocardial infarction (MI) during 60 months of follow-up.

Methods: We studied 111 patients after MI occurred > 60 days (27 [9; 84] months) before enrollment (84 men; mean age 64.1±10.5 years). All subjects had 24-hour ambulatory ECG monitoring with HRT, DC and mTWA evaluation. Follow-up period was 60 months; primary endpoint was SCD, secondary endpoint included all non-sudden cardiovascular deaths.

Results: During follow-up, we registered 19 cases of SCD and 11 cases of non-sudden cardiovascular deaths (including 7 fatal MI and 3 fatal strokes). DC had high negative predictive value (97.4% for all-cause mortality and 93.7% for SCD). DC values below 4.15 for all-cause mortality and 2.0 for SCD significantly increased risk of all-cause mortality (OR 8.5, 95% CI 2.9 to 24.6, р<0.001) и SCD (OR 9.6, 95% CI 3.2 to 28.5, р<0.001). Combined risk assessment at 12 months revealed that the most significant combination was HRT2 and mTWA100 > 53 mcV, which increased risk both of all-cause mortality (30.7-fold) and SCD (63.3-fold); however, at 60 months this predictive value for SCD decreased (OR = 20.8 (95% CI 2.8 to 114.0), p <0.001).

Conclusion: Evaluation of HRT, DC and mTWA during 24-hour ECG monitoring may define the high risk of cardiovascular mortality and SCD in post-MI patients especially during the first 12 months after the baseline examination.

Keywords


Sudden cardiac death; Risk stratification; T-wave alternans; Heart rate turbulence; Deceleration capacity

Full Text:

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References


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DOI: http://dx.doi.org/10.17987/icfj.v11i0.393


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