Sex-based differences in T-wave alternans

Verrier, Richard L.

doi:10.1016/b978-0-12-817728-0.00012-7

Cited by 1 publication

(1 citation statement)

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“…TWA has been recognized as an established marker of repolarization heterogeneity at a cellular level and recommended in guidelines as an additional prognostic marker of TdP or ventricular arrhythmias for various cardiovascular disease settings and non-cardiovascular diseases alike [ 16 , 36 ]. Some studies also highlighted the existence of TWA in channelopathies such as long QT syndrome [ 37 ] and early repolarization syndrome [ 38 ].…”

Section: Discussionmentioning

confidence: 99%

Is T-Wave Alternans a Repolarization Abnormality Marker in COVID-19? An Investigation on the Potentialities of Portable Electrocardiogram Device

Tondas¹,

Munawar

Marcantoni

et al. 2023

Cardiol Res

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Background: Cardiac arrhythmias are significantly associated with poor outcomes in coronavirus disease 2019 patients. Microvolt T-wave alternans (TWA) can be automatically quantified and has been recognized as a representation of repolarization heterogeneity and linked to arrhythmogenesis in various cardiovascular diseases. This study aimed to explore the correlation between microvolt TWA and COVID-19 pathology.Methods: Patients suspected of COVID-19 in Mohammad Hoesin General Hospital were consecutively evaluated using Alivecor ® Kardiamobile 6L™ portable electrocardiogram (ECG) device. Severe COVID-19 patients or those who are unable to cooperate in active ECG self-recording were excluded from the study. TWA was detected and its amplitude was quantified using the novel enhanced adaptive match filter (EAMF) method.Results: A total of 175 patients, 114 COVID-19 patients (polymerase chain reaction (PCR)-positive group), and 61 non-COVID-19 pa-tients (PCR-negative group) were enrolled in the study. PCR-positive group was subdivided according to the severity of COVID-19 pathology into mild and moderate severity subgroups. Baseline TWA levels were similar between both groups during admission (42.47 ± 26.52 µV vs. 44.72 ± 38.21 µV), but higher TWA levels were observed during discharge in the PCR-positive compared to the PCR-negative group (53.45 ± 34.42 µV vs. 25.15 ± 17.64 µV, P = 0.03). The correlation between PCR-positive result in COVID-19 and TWA value was significant, after adjustment of other confounding variables (R 2 = 0.081, P = 0.030). There was no significant difference in TWA levels between mild and moderate severity subgroups in patients with COVID-19, both during admission (44.29 ± 27.14 µV vs. 36.75 ± 24.46 µV, P = 0.34) and discharge (49.47 ± 33.62 µV vs. 61.09 ± 35.99 µV, P = 0.33). Conclusions:Higher TWA values can be observed on follow-up ECG obtained during discharge in the PCR-positive COVID-19 patients.

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Section: Discussionmentioning

confidence: 99%