Did Chiu et al. uncover changes of heart ECG/EKG parameters in Taipei City after Pfizer BNT162b2 mRNA technology gene based vaccine in the senior high school students (4928)? Yes! 763 students (17.1%)

had at least one cardiac symptom after second vaccine dose, mostly chest pain and palpitations. Abnormal ECGs were obtained in 51 (1.0%) of the students, of which 1 was diagnosed with mild myocarditis

https://link.springer.com/article/10.1007/s00431-022-04786-0

‘performed a ECG screening study during the second dose of Pfizer BNT162b2 vaccines.

Serial comparisons of ECGs and questionnaire survey were performed before and after vaccine in four male-predominant senior high schools.

Among 7934 eligible students, 4928 (62.1%) were included in the study. The male/female ratio was 4576/352.

In total, 763 students (17.1%) had at least one cardiac symptom after the second vaccine dose, mostly chest pain and palpitations.

The depolarization and repolarization parameters (QRS duration and QT interval) decreased significantly after the vaccine with increasing heart rate.

Abnormal ECGs were obtained in 51 (1.0%) of the students, of which 1 was diagnosed with mild myocarditis and another 4 were judged to have significant arrhythmia.’