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

Background: Cardiac arrhythmias are significantly associated with poor outcomes in coronavirus disease 2019 (COVID-19) 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 patients (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 (R2 = 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.

COVID arm as a common cutaneous manifestation after mRNA-1273 vaccination: a systematic review.

BACKGROUND: By August 2022, CoronaVirus Disease-2019 (COVID-19) had caused 600 million illnesses and 6.5 million fatalities globally. A massive vaccination program is being implemented worldwide to suppress this condition. Several works of literature stated that mRNA COVID-19 vaccination, specifically with the mRNA-1273 vaccine, is followed by clear evidence of the COVID arm effects associated with this vaccine. OBJECTIVE: To analyze the latest evidence of COVID arm as a common effect of mRNA-1273 vaccination with the ultimate goal of improving vaccine counseling to help healthcare professionals and reassure patients. METHODS: A comprehensive search was performed on topics that assess the COVID arm as a cutaneous manifestation following mRNA-1273 vaccination from inception up until July 2022. RESULTS: Eighteen studies with a total of 1129 participants after the first and second dose of mRNA-1273 vaccination reported that most participants had COVID arm following the first dose administration. The characteristics of the patients were a mean age of 43.8 years old, and females represented ≥ 50% in most studies, with a mean onset of 6.9 days after the first dose administration. Symptoms resolved within seven days following the treatment and were harmless. CONCLUSIONS: This study found that the COVID arm condition is most common following the first mRNA-1273 vaccination in the female and middle-aged group. The correlation between demographic variables and COVID arm risk elucidates that the reaction is a type IV allergic skin reaction.

Arrhythmia Risk Profile and Ventricular Repolarization Indices in COVID-19 Patients: A Systematic Review and Meta-Analysis.

INTRODUCTION: Coronavirus disease 2019 (COVID-19) has been associated with cardiac arrhythmias. Several electrocardiographic markers have been used to predict the risk of arrhythmia in patients with COVID-19. We aim to investigate the electrocardiographic (ECG) ventricular repolarization indices in patients with COVID-19. METHODOLOGY: We performed a comprehensive systematic literature search from PubMed, EuropePMC, SCOPUS, Cochrane Central Database, and Google Scholar Preprint Servers. The primary endpoints of this search were: Tp-e (T-peak-to-T-end) interval, QTd (QT dispersion), and Tp-e/QTc ratio in patients with newly diagnosed COVID-19 from inception up until August 2020. RESULTS: There were a total of 241 patients from 2 studies. Meta-analysis showed that Tp-e/QTc ratio was higher in COVID-19 group (mean difference 0.02 [0.01, 0.02], p < 0.001; I2: 18%,). Tp-e interval was more prolonged in COVID-19 group (mean difference 7.76 [3.11, 12.41], p < 0.001; I2: 80%) compared to control group. QT dispersion (QTd) also was increased in COVID-19 group (mean difference 1.22 [0.61, 1.83], p < 0.001 ; I2:30%). CONCLUSIONS: Several electrocardiographic markers including Tp-e/QTc, Tp-e interval, and QTd are significantly increased in patients with COVID-19.