What does this research mean for the field?

Acidosis, but not hyperkalemia, diminishes the effectiveness of sympathomimetic amines in increasing the idioventricular rate during complete A-V heart block, with the reduction correlating to the severity of the acidosis. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To evaluate the impact of acidosis and hyperkalemia on sympathomimetic amines' effectiveness in dogs with complete A-V heart block.

July 1, 1959Circulation ResearchOpen Access

Cardiac Effects of Isoproterenol, Norepinephrine and Epinephrine in Complete A-V Heart Block During Experimental Acidosis and Hyperkalemia

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Why the study?

Does acidosis or hyperkalemia affect the effectiveness of sympathomimetic amines in increasing idioventricular rate in dogs with complete A-V heart block?

Key Points

To evaluate the impact of acidosis and hyperkalemia on sympathomimetic amines' effectiveness in dogs with complete A-V heart block.
Experimental design using dogs with induced complete A-V heart block
Assessment of idioventricular rate changes with isoproterenol, norepinephrine, and epinephrine under varying acidosis levels
Comparison of effects between states of acidosis and hyperkalemia
Acidosis significantly reduced the effectiveness of isoproterenol, norepinephrine, and epinephrine in increasing idioventricular rate.
The reduction in effectiveness correlated with the severity of acidosis.
Hyperkalemia did not significantly impact the effectiveness of the sympathomimetic amines despite unchanged pH.

Structured PICO

Does acidosis or hyperkalemia affect the effectiveness of sympathomimetic amines in increasing idioventricular rate in dogs with complete A-V heart block?

Population

Dogs with experimentally induced complete A-V heart block

Intervention

Sympathomimetic amines (isoproterenol, norepinephrine, and epinephrine) administered during experimental acidosis (metabolic and respiratory) or hyperkalemia

Outcome

Idioventricular ratesurrogate

Acidosis, but not hyperkalemia, reduces the chronotropic efficacy of sympathomimetic amines in a canine model of complete A-V block.

Discussion

No takes yet. Share an insight, caveat, or question.

Implication

May blunt sympathomimetic efficacy in acidotic AV block; hypothesis-generating for human translation.

Cite This Study

Guzmán et al. (1959) studied this question.

synapsesocial.com/papers/6a10d0c8d06b5b96589f94ef https://doi.org/10.1161/01.res.7.4.666

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Cardiac Effects of Isoproterenol, Norepinephrine and Epinephrine in Complete A-V Heart Block During Experimental Acidosis and Hyperkalemia

Key Points

Structured PICO

Discussion

Implication

Cite This Study

Cardiac Effects of Isoproterenol, Norepinephrine and Epinephrine in Complete A-V Heart Block During Experimental Acidosis and Hyperkalemia

Key Points

Structured PICO

Discussion

Implication

Cite This Study

Also Consider

Also Consider