What question did this study set out to answer?

The study investigates how EDTA affects ouabain-induced contractures in frog heart muscle fibers and calcium handling.

July 1, 1960American Journal of Physiology-Legacy Content

Ouabain contracture of frog heart: Ca45 movements and effect of EDTA

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Population

Frog heart muscle fibers

Design

Preclinical

Authors

LTLyell J. ThomasUniversity of Southern California

Discussion

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Implication

EDTA selectively relaxes ouabain-induced contractures in frog myocardium; leaves open calcium's role in digitalis effects for mammalian studies.

Key Points

The study investigates how EDTA affects ouabain-induced contractures in frog heart muscle fibers and calcium handling.
Frog heart muscle fibers were treated with ouabain and assessed for contractures.
EDTA was applied to evaluate its effects on ion permeability and muscle contraction.
Calcium movements were tracked using Ca<sup>45</sup> to determine uptake during contractures.
EDTA caused relaxation of ouabain-induced contractures but did not affect those induced by iodoacetate.
A slight increase in Ca<sup>45</sup> uptake occurred during ouabain contracture, indicating altered calcium handling.
Contractures induced by iodoacetate could be reversed aerobically, regardless of EDTA presence.

Structured PICO

Population

Frog heart muscle fibers

Intervention

Ouabain, EDTA, and iodoacetate

Outcome

Muscle contracture and Ca45 uptakesurrogate

The study suggests that ouabain-induced contracture in frog heart muscle is primarily due to altered calcium handling rather than shifts in sodium/potassium or energy metabolism.

Cite This Study

Lyell J. Thomas (1960) studied this question.

synapsesocial.com/papers/6a717136fe4101aa97e09380 https://doi.org/10.1152/ajplegacy.1960.199.1.146

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Implication

EDTA selectively relaxes ouabain-induced contractures in frog myocardium; leaves open calcium's role in digitalis effects for mammalian studies.

Ouabain contracture of frog heart: Ca45 movements and effect of EDTA

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Ouabain contracture of frog heart: Ca45 movements and effect of EDTA

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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