Nascimento GAD, Souza DSD, Lima BS, Vasconcelos CMLD, Araújo AADS, Durço AO, Quintans-Junior LJ, Almeida JRGDS, Oliveira AP, Santana-Filho VJD, Barreto AS, Santos MRVD. Bradycardic and Antiarrhythmic Effects of the D-Limonene in Rats.
Arq Bras Cardiol 2020;
113:925-932. [PMID:
31482987 PMCID:
PMC7020959 DOI:
10.5935/abc.20190173]
[Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Accepted: 02/13/2019] [Indexed: 01/09/2023] Open
Abstract
Background
D-limonene (DL) is a monoterpene and is the major component in the essential oil of citrus fruit. It presents antihyperglycemic and vasodilatation activities.
Objectives
This study evaluated the cardiovascular effects and potential antiarrhythmic of DL in rats.
Methods
Hemodynamic and electrocardiographic (ECG) parameters were measured in male Wistar rats, which under anesthesia had been cannulated in the abdominal aorta and lower vena cava and had electrodes subcutaneously implanted. In the in vitro approach, the heart was removed and perfused using the Langendorff technique. The significance level adopted was 5% (p < 0.05).
Results
DL, in doses of 10, 20, and 40 mg/kg (i.v), produced intense and persistent bradycardia associated with hypotension. Bradycardia with prolonged QTc was observed in the ECG in vivo recording. In the in vivo model of arrhythmia induced by Bay K8644, DL (10 mg/kg) decreased the arrhythmia score from 15.33 ± 3.52 to 4.0 ± 2.64 u.a (p < 0.05, n = 4). In isolated perfused hearts, DL (10-3 M) promoted significant reductions in heart rate (from 228.6 ± 8.5 ms to 196.0 ± 9.3 bpm; p < 0.05) and left ventricular development pressure (from 25.2 ± 3.4 to 5.9 ± 1.8 mmHg; n = 5, p < 0.05).
Conclusions
DL produces bradycardia and antiarrhythmic activity in rat heart.
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