What question did this study set out to answer?

To characterize the spatial distribution of action potential characteristics and troponin T isoform expression in the right atrium across adult and newborn canine models.

December 1, 1989Circulation Research

Multiple regional differences in cellular properties that regulate repolarization and contraction in the right atrium of adult and newborn dogs.

Q: What is the clinical evidence from this study?

Study design: Other. Primary outcome: Spatial distribution of action potentials and troponin T isoform expression.

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Key result

In adult and newborn canine right atria, regional differences in action potential duration correspond with troponin T isoform expression, suggesting coordinated developmental and regional control.

Authors

MSMadison S. SpachPediatric / Congenital Cardiology PDPaul C. DolberPennsylvania State University PAPage A.W. AndersonUniversity of North Carolina at Chapel Hill

Discussion

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Implication

Hypothesis-generating in canine atria; leaves open translational relevance to human atrial arrhythmias.

Key Points

To characterize the spatial distribution of action potential characteristics and troponin T isoform expression in the right atrium across adult and newborn canine models.
Measured the spatial distribution, shape, and duration of action potentials across right atrial regions in adult and newborn dogs.
Evaluated electrophysiological responses to pacing pauses to test intrinsic cellular properties versus electronic interactions.
Analyzed the regional distribution and expression patterns of troponin T isoforms (TnT1, TnT2, TnT3, TnT4) in adult and newborn atrial tissue.
Adult right atria showed a continuous spatial gradient where action potential duration was longest near the sinus node and decreased with increasing distance; newborn atria showed adult-like patterns only in the upper crista, with minimal regional variation elsewhere.
Adult tissues exhibited the highest proportion of TnT1 near the sinus node with increasing proportions of TnT2 at greater distances, whereas newborn tissues displayed high TnT1 restricted to the upper crista and uniform isoform distribution elsewhere.
Testing of electronic interactions failed to account for regional electrical differences, whereas cellular response variations to pauses supported cell-intrinsic developmental regulation.

PICO

Primary Outcome

Spatial distribution of action potentials and troponin T isoform expression

Cite This Study

Spach et al. (1989) studied this question. In adult and newborn canine right atria, regional differences in action potential duration correspond with troponin T isoform expression, suggesting coordinated developmental and regional control.

synapsesocial.com/papers/6a0f8d8e01be78fe815fd2d2 https://doi.org/10.1161/01.res.65.6.1594

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Multiple regional differences in cellular properties that regulate repolarization and contraction in the right atrium of adult and newborn dogs.

Discussion

Member takes

Implication

Key Points

PICO

Cite This Study

Multiple regional differences in cellular properties that regulate repolarization and contraction in the right atrium of adult and newborn dogs.

Discussion

Member takes

Implication

Key Points

PICO

Cite This Study

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