Key result
Ethanolic garlic extract produces ~15-point greater negative inotropy than aqueous extract in rat atria.
Why the study?
The acute negative inotropic and chronotropic effects of aqueous and alcoholic garlic extracts on rat atria contractions were investigated to understand their cardiovascular impact.
Ethanolic garlic extracts show potent negative inotropic and chronotropic effects in preclinical models, which may contribute to cardiovascular benefits.
Answers are grounded in this paper and cite their sources.
No immediate clinical implications; leaves open whether garlic extracts affect human atrial function or hemodynamics.
The acute negative inotropic and chronotrophic effects of aqueous and alcoholic garlic extracts (Allium sativum L.) on spontaneous and adrenalin-stimulated contractions of the Wistar rat atria were investigated. The addition of garlic extracts to isolated rat atria evoked negative inotropic and chronotropic effects. Ethanolic garlic extract exerts much stronger negative inotropic (58.33 +/- 14.76%) effects than aqueous extract (43.66 +/- 16.32%). The difference in frequency reduction is especially conspicuous. Aqueous garlic extract very slightly affects the frequency, while ethanolic extract reduces it by more than 40%. In addition to these effects, the positive inotropism and chronotropism induced by the addition of noradrenaline, were much more antagonized by ethanolic garlic extract than by aqueous extract. Moreover, ethanolic garlic extract establishes sinus rhythm in the atria with extrasystoles induced by noradrenaline.
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Radenković et al. (2010) studied Spontaneous and adrenalin-stimulated contractions in rat atria. Ethanolic garlic extract vs. Aqueous garlic extract was evaluated on Negative inotropic effect. Ethanolic garlic extract exerted a stronger negative inotropic effect (58.33%) compared to aqueous extract (43.66%) and reduced contraction frequency by over 40% in isolated rat atria.
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