What is the clinical evidence from this study?

Study design: Other. Population: Cx40 deficiency. Intervention: Cx40 deficiency vs. Wild-type mice. Primary outcome: Cardiac activation and Connexin distribution.

What question did this study set out to answer?

This study aims to explore the role of connexin40 in cardiac conduction by comparing hearts of normal and connexin40-deficient mice.

March 20, 2001Circulation

Impaired Conduction in the Bundle Branches of Mouse Hearts Lacking the Gap Junction Protein Connexin40

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Key result

Cx40 deficiency in mice results in right bundle-branch block and impaired left bundle-branch conduction compared with wild-type animals.

Population

Langendorff-perfused adult mice hearts (normal/wild-type and Cx40-deficient)

Comparison

Cx40 deficiency (genetic knockout) vs Wild-type mice hearts

Design

Preclinical

Authors

HRHarold V.M. van RijenCentre National de la Recherche Scientifique TVToon A.B. van VeenElectrophysiology MKMarjan J. A. van KempenUniversity Medical Center Utrecht

Discussion

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Implication

No immediate clinical implications for conduction disorders; leaves open Cx40 relevance to human bundle branch disease.

Key Points

This study aims to explore the role of connexin40 in cardiac conduction by comparing hearts of normal and connexin40-deficient mice.
Recorded epicardial and septal activation in Langendorff-perfused adult mouse hearts using a 247-point electrode.
Conducted immunohistochemistry and histology to assess connexin distribution and fibrosis.
Cx40-deficient mice exhibited right bundle-branch block and impaired left bundle-branch conduction.
Histology showed continuity of myocytes from the common bundle to the septal myocardium, with Cx45 expressed in proximal bundles.

Structured PICO

Population

Adult mice hearts (wild-type and Cx40-deficient) evaluated for cardiac activation and Connexin distribution.

Exposure

Cx40 deficiency (genetic knockout)

Comparator

Wild-type mice hearts

Outcome

Cardiac activation (epicardial and septal) and Connexin distributionsurrogate

Cx40 deficiency in mice leads to right bundle-branch block and impaired left bundle-branch conduction, highlighting its critical role in the cardiac conduction system.

Cite This Study

Rijen et al. (2001) studied Cx40 deficiency. Cx40 deficiency vs. Wild-type mice was evaluated on Cardiac activation and Connexin distribution. Cx40 deficiency in mice results in right bundle-branch block and impaired left bundle-branch conduction compared with wild-type animals.

synapsesocial.com/papers/6a23968abcda00f3e0a013cc https://doi.org/10.1161/01.cir.103.11.1591

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Impaired Conduction in the Bundle Branches of Mouse Hearts Lacking the Gap Junction Protein Connexin40

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Impaired Conduction in the Bundle Branches of Mouse Hearts Lacking the Gap Junction Protein Connexin40

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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