What is the clinical evidence from this study?

Study design: Case Report. Population: intermittent left septal fascicle block (n=1). Intervention: intermittent left septal fascicle block.

What question did this study set out to answer?

To clarify the electrocardiographic characteristics of intermittent septal fascicle block and its clinical implications.

May 11, 2026Journal of Electrocardiology0 citations

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Could this intermittent prominent anterior force be a septal fascicle block?

DBDaniel Teixeira de Campos e BarreiroFaculdade de Medicina de Marília LCLivia Maria de Paula CastroFaculdade de Medicina de Marília JAJosé Nunes de AlencarInstituto Dante Pazzanese de Cardiologia

Key Result

An intermittent left septal fascicle block was identified as the cause of transitory prominent anterior forces on a preoperative ECG in 1 adult male.

Key Points

To clarify the electrocardiographic characteristics of intermittent septal fascicle block and its clinical implications.
Case study of an adult male with a history of diabetes mellitus and systemic hypertension
Identified prominent anterior forces on a preoperative ECG
Analyzed the intermittent pattern of the R-wave in right precordial leads
Documented transitory prominent anterior forces consistent with septal fascicle block
Highlighted the relevance of recognizing septal fascicular block in ECG interpretations
Asserted its underrecognized impact on right precordial lead patterns

Study Design

Type

Case Report (n=1)

Structured PICO

Population

1 adult male with a history of diabetes mellitus and systemic hypertension presenting with transitory prominent anterior forces on a preoperative ECG.

Exposure

Preoperative ECG

Outcome

Identification of intermittent left septal fascicle block

Clinicians should recognize septal fascicular block as an emerging cause of a prominent R-wave in the right precordial leads, especially when intermittent.

Abstract

BACKGROUND: A septal fascicle of the left bundle branch is an anatomical variant present in a substantial number of human hearts. However, the electrocardiographic features of its block remain controversial. CASE SUMMARY: We describe a case of transitory prominent anterior forces consistent with an intermittent left septal fascicle block, identified on a preoperative ECG of an adult male with a history of diabetes mellitus and systemic hypertension. CONCLUSION: Clinicians should recognize septal fascicular block as an emerging and underrecognized cause of a prominent R-wave in the right precordial leads, particularly when the pattern is intermittent.

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Cite This Study

Barreiro et al. (Fri,) conducted a case report in intermittent left septal fascicle block (n=1). intermittent left septal fascicle block was evaluated. An intermittent left septal fascicle block was identified as the cause of transitory prominent anterior forces on a preoperative ECG in 1 adult male.

synapsesocial.com/papers/6a025f20c9581ed855361ca7 https://doi.org/https://doi.org/10.1016/j.jelectrocard.2026.154356

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