What does this research mean for the field?

The initial phase of ventricular systole is a period of asynchronous contraction and sphericalization, rather than an 'isometric contraction', because myocardial fibers change length as the chamber's longitudinal axis shortens and lateral walls bulge. Novelty: ClaimNovelty.CONTRADICTORY. Consensus alignment: ConsensusAlignment.CHALLENGES_CONSENSUS.

What question did this study set out to answer?

This research aims to reevaluate the characteristics of the initial phase of ventricular systole and its contraction dynamics.

December 31, 1955American Journal of Physiology-Legacy Content

Initial Phase of Ventricular Systole: Asynchronous Contraction

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Authors

RRRobert F. RushmerUniversity of Washington

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Implication

Early ventricular expansion challenges the isometric contraction paradigm; leaves open updated mechanics models for imaging and simulation.

Key Points

This research aims to reevaluate the characteristics of the initial phase of ventricular systole and its contraction dynamics.
Direct gauges applied to the ventricular walls recorded cyclic changes in left ventricle dimensions.
Measurements included diameter, circumference, and length during the onset of systole.
Observations focused on the behavior of myocardial fibers and the shape of the chamber.
The internal diameter, external circumference, and external length of the left ventricle quickly expanded at the onset of systole.
Early contraction of papillary muscles and trabeculae led to the chamber becoming more spherical as internal pressure rose.
The term 'isometric contraction' is deemed inappropriate for this phase due to the observed dimensional changes.

Cite This Study

Robert F. Rushmer (1955) studied this question.

synapsesocial.com/papers/6a1577f9d64fa333899fb478 https://doi.org/10.1152/ajplegacy.1955.184.1.188

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Implication

Early ventricular expansion challenges the isometric contraction paradigm; leaves open updated mechanics models for imaging and simulation.

Initial Phase of Ventricular Systole: Asynchronous Contraction

Discussion

Member takes

Implication

Key Points

Cite This Study

Initial Phase of Ventricular Systole: Asynchronous Contraction

Discussion

Member takes

Implication

Key Points

Cite This Study

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