What is the clinical evidence from this study?

Study design: Case Report. Population: Unstable bilateral bundle branch block (n=2). Intervention: His bundle recordings and electrocardiograms. Primary outcome: Concealed intraventricular conduction phenomena.

What question did this study set out to answer?

To identify and characterize sites of concealed intraventricular conduction by analyzing functional aftereffects on His bundle recordings.

May 1, 1976CirculationOpen Access

Concealed intraventricular conduction in the His bundle electrogram.

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Key result

His bundle recordings in two patients with unstable bilateral bundle branch block demonstrated multiple areas of concealed intraventricular conduction based on observed aftereffects.

Population

2 patients with unstable bilateral bundle branch block

Design

Case_series

Authors

HCHoward C. CohenIllinois College IDI A D'CruzVeterans Health Administration APAlfred PickUniversity College Dublin

Discussion

Member takes

Implication

May detect multiple concealed conduction sites via His bundle recordings; leaves open effects on management of bilateral bundle branch block.

Key Points

To identify and characterize sites of concealed intraventricular conduction by analyzing functional aftereffects on His bundle recordings.
Evaluated surface electrocardiograms and intracardiac His bundle electrograms in two patients (N=2) with unstable bilateral bundle branch block.
Assessed changes in conduction dynamics across varying timing intervals of ventricular depolarization triggered by sinus or paced impulses.
Demonstrated concealed transseptal retrograde penetration occurring across both the left and right bundle branch systems.
Identified alternate-beat Wenckebach block involving concealed proximal penetration and concealed right bundle branch re-entry that reset 2:1 H-V block sequences to induce subsequent A-H block.
Observed infrahisian Wenckebach block causing simultaneous variations in atrioventricular conduction timing and QRS morphology.

Study Design

Type

Case Report (n=2)

Structured PICO

Population

Two patients with unstable bilateral bundle branch block evaluated with electrocardiograms and His bundle recordings.

Exposure

His bundle recordings and electrocardiograms

Outcome

Mechanisms of concealed intraventricular conductionsurrogate

His bundle recordings in patients with unstable bilateral bundle branch block can reveal complex mechanisms of concealed intraventricular conduction.

Cite This Study

Cohen et al. (1976) conducted a case report in Unstable bilateral bundle branch block (n=2). His bundle recordings and electrocardiograms was evaluated on Concealed intraventricular conduction phenomena. His bundle recordings in two patients with unstable bilateral bundle branch block demonstrated multiple areas of concealed intraventricular conduction based on observed aftereffects.

synapsesocial.com/papers/6a6c810cf44fa9f079db4388 https://doi.org/10.1161/01.cir.53.5.776

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Implication

May detect multiple concealed conduction sites via His bundle recordings; leaves open effects on management of bilateral bundle branch block.

Concealed intraventricular conduction in the His bundle electrogram.

Discussion

Member takes

Implication

Key Points

Study Design

Structured PICO

Cite This Study

Concealed intraventricular conduction in the His bundle electrogram.

Discussion

Member takes

Implication

Key Points

Study Design

Structured PICO

Cite This Study

Also Consider

Also Consider