What does this research mean for the field?

Potassium channel blockers antagonize the negative inotropic and chronotropic effects of the muscarinic agonist carbachol but not the adenosine A1-receptor agonist R-PIA, supporting the conclusion that R-PIA acts by inhibiting calcium influx through L-channels. Novelty: ClaimNovelty.CONFIRMATORY. Consensus alignment: ConsensusAlignment.SUPPORTS_CONSENSUS.

July 1, 1989British Journal of PharmacologyOpen Access

Potassium channel blockers differentially affect carbachol and (−)‐N6‐phenylisopropyladenosine on guinea‐pig atria

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Population

guinea-pig isolated atria

Comparison

Potassium channel blockers and variations in K+… vs Baseline responses / responses without blockers

Design

Preclinical

Authors

MBMariella De BiasiCalifornia University of Pennsylvania GFGuglielmina FroldiUniversity of Padua EREugenio RagazziUniversity of Padua

Discussion

Member takes

Implication

Distinguishes carbachol from R-PIA signaling in atria; supports L-type Ca2+ inhibition by R-PIA but leaves open human translation.

Structured PICO

Population

guinea-pig isolated atria

Intervention

Potassium channel blockers (tetraethylammonium [TEA], 4-aminopyridine [4-AP], and apamin) and variations in K+ and Ca2+ concentrations

Comparator

Baseline responses / responses without blockers

Outcome

Negative inotropic and chronotropic effects induced by R-PIA and carbacholsurrogate

The study suggests that R-PIA acts on isolated atria by inhibiting Ca2+ influx through L-channels, unlike carbachol whose effects are antagonized by potassium channel blockers.

Cite This Study

Biasi et al. (1989) studied this question.

synapsesocial.com/papers/6a1709b2b082e78ad77bcd66 https://doi.org/10.1111/j.1476-5381.1989.tb12026.x

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Potassium channel blockers differentially affect carbachol and (−)‐N6‐phenylisopropyladenosine on guinea‐pig atria

Discussion

Member takes

Implication

Structured PICO

Cite This Study

Potassium channel blockers differentially affect carbachol and (−)‐N6‐phenylisopropyladenosine on guinea‐pig atria

Discussion

Member takes

Implication

Structured PICO

Cite This Study

Also Consider

Also Consider