Quercetin Reduces the Susceptibility to Cardiac Reperfusion Arrhythmias in Ovariectomized Rats.

Area of Science:

• Cardiology
• Pharmacology
• Biochemistry

Background:

• Cardiovascular diseases (CVDs) are a leading global cause of death.
• Decreased estrogen levels during menopause elevate the risk of CVDs, particularly ischemic heart disease (IHD).
• Quercetin, a flavonoid, exhibits antioxidant, anti-inflammatory, and anti-apoptotic properties beneficial for CVDs.

Purpose of the Study:

• To investigate the cardioprotective effects of quercetin.
• To assess quercetin's impact on cardiac reperfusion arrhythmias.
• To evaluate quercetin's influence on mitochondrial function in an ovariectomized rat model.

Main Methods:

• Ovariectomized (OVX) Wistar rats were treated with quercetin (25 mg·kg⁻¹) or vehicle for 4 weeks.
• Cardiac reperfusion arrhythmias and myocardial infarct size were assessed.
• Mitochondrial swelling and ATP production were measured.

Main Results:

• Quercetin treatment significantly reduced myocardial infarct size and susceptibility to reperfusion arrhythmias.
• Quercetin prevented mitochondrial swelling in OVX rats.
• Quercetin administration increased ATP production compared to the vehicle-treated OVX group.

Conclusions:

• Quercetin demonstrates therapeutic potential in mitigating cardiovascular damage associated with low estrogen levels.
• Quercetin may offer protective benefits against ischemic heart disease in postmenopausal women.
• The findings support quercetin's role in improving mitochondrial function and reducing cardiac injury.