ISSN 2149-2263 | E-ISSN 2149-2271
Volume : 25 Issue : 6 Year : 2021
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The Anatolian Journal of Cardiology Incomplete right bundle branch block: Challenges in electrocardiogram diagnosis [Anatol J Cardiol]
Anatol J Cardiol. 2021; 25(6): 380-384 | DOI: 10.5152/AnatolJCardiol.2021.84375

Incomplete right bundle branch block: Challenges in electrocardiogram diagnosis

Mariana Floria1, Noela Parteni1, Alexandra Ioana Neagu2, Radu Andy Sascau2, Cristian Statescu2, Daniela Maria Tanase3
1Internal Medicine Clinic, “Dr. Iacob Czihac” Military Emergency Clinical Hospital; Iasi-Romania;Department of Internal Medicine, "Grigore T. Popa" University of Medicine and Pharmacy; Iasi-Romania
2Department of Internal Medicine, "Grigore T. Popa" University of Medicine and Pharmacy; Iasi-Romania;“Prof. Dr. George I.M. Georgescu” Institute of Cardiovascular Disease; Iasi-Romania
3Department of Internal Medicine, "Grigore T. Popa" University of Medicine and Pharmacy; Iasi-Romania;Internal Medicine Clinic, "St. Spiridon" County Clinical Emergency Hospital; Iasi-Romania

Incomplete right bundle branch block (IRBBB), an entity undefined by a general consensus, can express a large pallet of both benign and pathological patterns. IRBBB is a common electrocardiogram (ECG) finding at all ages, more frequent in men and athletes. Usually, IRBBB does not need further evaluation; however, if abnormalities are found on the clinical exam, heart disease should be excluded. The RSR’ pattern and a QRS width below 100 ms define the crista supraventricularis (CSV) pattern. CSV is a right ventricular crest, one of the last structures to be depolarized by the Purkinje network. CSV pattern might result from posterior apex deviation, subpulmonic area delay, or late CSV activation. IRBBB can appear because of higher placement of electrodes V1 and V2 and pectus excavatum, in which P wave is negative, or in athletes, considered a benign pattern unless family history, symptoms, or left ventricular hypertrophy. It is necessary to differentiate IRBBB from pathological patterns such as type-2 Brugada ECG pattern, right ventricular enlargement, arrhythmogenic right ventricular cardiomyopathy, ventricular preexcitation—Wolf-Parkinson-White syndrome, and hyperkalemia. Examiners should be particularly alert to the splitting of the second heart sound because RBBB is a common finding in ostium secundum atrial septal defect. Therefore, clinicians need to be familiar with this ECG finding, which is not always a benign condition.

Keywords: incomplete right bundle branch block, crista supraventricularis, RSR’ pattern

Mariana Floria, Noela Parteni, Alexandra Ioana Neagu, Radu Andy Sascau, Cristian Statescu, Daniela Maria Tanase. Incomplete right bundle branch block: Challenges in electrocardiogram diagnosis. Anatol J Cardiol. 2021; 25(6): 380-384

Corresponding Author: Noela Parteni, Romania