Research Article

Repolarisation Changes Associated with Serum Vitamin B12 Levels : Evaluation with Frontal QRS-T Angle

Volume: 16 Number: 4 January 1, 2026
TR EN

Repolarisation Changes Associated with Serum Vitamin B12 Levels : Evaluation with Frontal QRS-T Angle

Abstract

Introduction: Vitamin B12 deficiency may influence cardiac autonomic function and ventricular repolarization. The frontal QRS-T angle is a novel and useful electrocardiographic parameter that reflects the relationship between ventricular depolarisation and repolarisation. The aim of this study was to evaluate the association between serum vitamin B12 levels and the frontal QRS-T angle in asymptomatic individuals. Method: The current retrospective study comprised 92 adults who underwent a standard 12-lead ECG and serum vitamin B12 testing on the same day. Participants were divided into two groups according to their vitamin B12 levels (Group 1 was defined as abnormal having a level of less than 300 pg/mL, while Group 2 was defined as normal having a level of 300 pg/mL or more). The patient's clinical characteristics, laboratory findings and ECG parameters were recorded. The frontal QRS-T angle was calculated automatically using the QRS and T axes provided by the ECG device. Results: The average age of participants was 46.1 (±12.2) years, and 51.9% of participants were female (p < 0.001). Individuals with low vitamin B12 concentrations exhibited a wider frontal QRS-T angle. It was determined that vitamin B12 level is an independent predictive factor for the frontal QRS-T angle. Conclusion: The frontal QRS-T angle may serve as a useful parameter for evaluating electrical changes and susceptibility to ventricular arrhythmias in individuals with vitamin B12 deficiency.

Keywords

References

  1. Aytemir K, Aksöyek S, Büyükasik Y, Haznedaroglu I, Atalar E, Ozer N et al. Assessment of autonomic nervous system functions in patients with vitamin B12 deficiency by power spectral analysis of heart rate variability. Pacing Clin Electrophysiol 2000; 23: 975-8.
  2. Oh R, Brown DL. Vitamin B12 deficiency. Am Fam Physician 2003; 67: 979-86.
  3. Beitzke M, Pfister P, Fortin J, Skrabal F. Autonomic dysfunction and hemodynamics in vitamin B12 deficiency. Auton Neurosci 2002; 97: 45-54.
  4. Monitillo F, Leone M, Rizzo C, Passantino A, Iacoviello M. Ventricular repolarization measures for arrhythmic risk stratification. World J Cardiol 2016; 8: 57–73.
  5. Kuyumcu MS, Özbay MB, Özen Y, Yayla Ç. Evaluation of frontal plane QRS-T angle in patients with slow coronary flow. Scand Cardiovasc J 2020; 54: 20–5.
  6. Oehler A, Feldman T, Henrikson CA, Tereshchenko LG. QRS-T angle: A review. Ann Noninvasive Electrocardiol 2014; 19: 534–42.
  7. Tekin A, Tanrıverdi Z, Kapıcı Y, Güc B, Karamustafalıoglu O. Comparison of frontal QRS-T angle in patients with schizophrenia and healthy volunteers. J Psychiatr Res 2022; 149: 76–82.
  8. Demir FA, Bingöl G, Ersoy İ, Arslan A, Ersoy P, Demir M et al. The Relationship between Frontal QRS-T Angle and Vitamin D Deficiency. Medicina (Kaunas) 2024; 60: 776.

Details

Primary Language

English

Subjects

Cardiology

Journal Section

Research Article

Publication Date

January 1, 2026

Submission Date

December 7, 2025

Acceptance Date

December 26, 2025

Published in Issue

Year 2025 Volume: 16 Number: 4

APA
Avcı Demır, F., Bingöl, G., Arslan, A., Demır, M., Ozden Kayhan, O., & Ünlü, S. (2026). Repolarisation Changes Associated with Serum Vitamin B12 Levels : Evaluation with Frontal QRS-T Angle. Turkish Journal of Clinics and Laboratory, 16(4), 637-643. https://doi.org/10.18663/tjcl.1837555
AMA
1.Avcı Demır F, Bingöl G, Arslan A, Demır M, Ozden Kayhan O, Ünlü S. Repolarisation Changes Associated with Serum Vitamin B12 Levels : Evaluation with Frontal QRS-T Angle. TJCL. 2026;16(4):637-643. doi:10.18663/tjcl.1837555
Chicago
Avcı Demır, Fulya, Gülsüm Bingöl, Akif Arslan, Meltem Demır, Ozge Ozden Kayhan, and Serkan Ünlü. 2026. “Repolarisation Changes Associated With Serum Vitamin B12 Levels : Evaluation With Frontal QRS-T Angle”. Turkish Journal of Clinics and Laboratory 16 (4): 637-43. https://doi.org/10.18663/tjcl.1837555.
EndNote
Avcı Demır F, Bingöl G, Arslan A, Demır M, Ozden Kayhan O, Ünlü S (January 1, 2026) Repolarisation Changes Associated with Serum Vitamin B12 Levels : Evaluation with Frontal QRS-T Angle. Turkish Journal of Clinics and Laboratory 16 4 637–643.
IEEE
[1]F. Avcı Demır, G. Bingöl, A. Arslan, M. Demır, O. Ozden Kayhan, and S. Ünlü, “Repolarisation Changes Associated with Serum Vitamin B12 Levels : Evaluation with Frontal QRS-T Angle”, TJCL, vol. 16, no. 4, pp. 637–643, Jan. 2026, doi: 10.18663/tjcl.1837555.
ISNAD
Avcı Demır, Fulya - Bingöl, Gülsüm - Arslan, Akif - Demır, Meltem - Ozden Kayhan, Ozge - Ünlü, Serkan. “Repolarisation Changes Associated With Serum Vitamin B12 Levels : Evaluation With Frontal QRS-T Angle”. Turkish Journal of Clinics and Laboratory 16/4 (January 1, 2026): 637-643. https://doi.org/10.18663/tjcl.1837555.
JAMA
1.Avcı Demır F, Bingöl G, Arslan A, Demır M, Ozden Kayhan O, Ünlü S. Repolarisation Changes Associated with Serum Vitamin B12 Levels : Evaluation with Frontal QRS-T Angle. TJCL. 2026;16:637–643.
MLA
Avcı Demır, Fulya, et al. “Repolarisation Changes Associated With Serum Vitamin B12 Levels : Evaluation With Frontal QRS-T Angle”. Turkish Journal of Clinics and Laboratory, vol. 16, no. 4, Jan. 2026, pp. 637-43, doi:10.18663/tjcl.1837555.
Vancouver
1.Fulya Avcı Demır, Gülsüm Bingöl, Akif Arslan, Meltem Demır, Ozge Ozden Kayhan, Serkan Ünlü. Repolarisation Changes Associated with Serum Vitamin B12 Levels : Evaluation with Frontal QRS-T Angle. TJCL. 2026 Jan. 1;16(4):637-43. doi:10.18663/tjcl.1837555

e-ISSN: 2149-8296

Publication Model: Continuous Publication

Peer Review Model: Double-Blind Peer Review

Publication Language: Turkish and English

Access Model: Open Access

DOI Prefix: (Crossref DOI numaranız)

Publisher: DNT Ortadoğu Publishing Inc.

Journal Abbreviation: Turk J Clin Lab

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