Complete atrioventricular block on isolated guinea pig heart induced by an aqueous fraction obtained from Psidium guajava L. leaf

Revista Brasileira de Farmacognosia

Antonio N.s. Gondim²  Vanda R. Oliveira²  Lusa R. Silva²  Bagnólia A. Silva¹  Eduardo A. Conde-garcia² 

[1] ,Universidade Federal de Sergipe Departamento de Fisiologia Laboratório de Biofísica do CoraçãoAracaju SE ,Brazil

关键词: Psidium guajava;    isolated heart;    electrocardiogram;    atrioventricular block;    Psidium guajava;    coração isolado;    electrocardiograma;    bloqueio atrioventricular;   

DOI  :  10.1590/S0102-695X2006000300006

来源: SciELO

【 摘 要 】

This paper aimed to study the electrocardiographic effect produced by the aqueous fraction (AqF) obtained from the acetic extract of Psidium guajava L. leaf on the isolated guinea pig heart. Electrocardiographic records (ECG) were obtained on isolated hearts beating spontaneously or under regular electrical stimulation. The hearts were mounted in a constant flow Langendorff perfusion system. Until 20 mg/mL, AqF did not change the spontaneous cardiac rate (control: 180 ± 9 bpm, test: 182 ± 10 bpm; N = 3; p > 0.05). Concentrations equal or greater then 20 mg/mL induced complete atrioventricular block (AVB). However, this effect promptly disappeared when AqF was removed from the perfusion fluid (N = 3 hearts). The AVB induced by AqF involves heart muscarinic receptors because atropine sulfate (1.5 mM) could prevent the appearance of such disturbance.

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