Electrophysiological study of functional bundle branch block: With particular reference to the similarity to premature ventricular contraction and R on T phenomenon

Q: What is the clinical evidence from this study?

Study design: Observational. Population: Functional bundle branch block (n=36). Intervention: Atrial extrastimulus technique. Primary outcome: Occurrence of R on T phenomenon (Prematurity Index ≤ 0.85).

Ken Okumura; Yutaka Horio; Manabu Rokutanda; Atsumi Hirata; Hideo Uchida; K Takaoka; Koshi Matsuyama; Shukuro Araki; T. Ono; Yoshiaki Matsumoto

doi:10.5105/jse.4.309

January 1, 1984Japanese Journal of ElectrocardiologyOpen Access

Electrophysiological study of functional bundle branch block: With particular reference to the similarity to premature ventricular contraction and R on T phenomenon

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Key result

Functional LBBB is linked to a ~184% higher rate of R on T phenomenon versus RBBB.

n=36

Study Design

Type

Observational (n=36)

Multicenter

Yes

PICO

P

Population

36 patients with functional bundle branch block (21 right, 15 left) who underwent electrophysiological study using His bundle electrogram and atrial extrastimulus technique.

E

Exposure / Comparator

Atrial extrastimulus technique

O

Primary Outcome

Occurrence of R on T phenomenon (Prematurity Index ≤ 0.85)

Limitations

Small sample size
Direct comparison of QT-V2 and min V2V3 between FRBBB and FLBBB groups was difficult due to different basic QT intervals and cycle lengths

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Implication

Higher R on T frequency in functional LBBB than RBBB during testing merits caution; leaves open its role in arrhythmia risk prediction.

Abstract

[in Japanese]

Discussion

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Cite This Study

Okumura et al. (1984) conducted an observational in Functional bundle branch block (n=36). Atrial extrastimulus technique was evaluated on Occurrence of R on T phenomenon (Prematurity Index ≤ 0.85). During atrial extrastimulus testing, the R on T phenomenon was observed in 25% of functional right bundle branch block cases and 71% of functional left bundle branch block cases.

synapsesocial.com/papers/6aa75547e109f999186d1c90 https://doi.org/10.5105/jse.4.309

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Electrophysiological study of functional bundle branch block: With particular reference to the similarity to premature ventricular contraction and R on T phenomenon

Study Design

PICO

Limitations

Ask about this paper

Implication

Abstract

Discussion

Cite This Study

Electrophysiological study of functional bundle branch block: With particular reference to the similarity to premature ventricular contraction and R on T phenomenon

Study Design

PICO

Limitations

Ask about this paper

Implication

Abstract

Discussion

Cite This Study

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