心肌保护
医学
迷走神经电刺激
心脏毒性
心功能曲线
迷走神经
阿霉素
缺血
药理学
麻醉
内科学
心力衰竭
刺激
化疗
作者
Nanthip Prathumsap,Benjamin Ongnok,Thawatchai Khuanjing,Apiwan Arinno,Chayodom Maneechote,Nattayaporn Apaijai,Titikorn Chunchai,Busarin Arunsak,Sasiwan Kerdphoo,Krekwit Shinlapawittayatorn,Siriporn C. Chattipakorn,Nipon Chattipakorn
出处
期刊:Circulation
[Ovid Technologies (Wolters Kluwer)]
日期:2021-11-16
卷期号:144 (Suppl_1)
标识
DOI:10.1161/circ.144.suppl_1.9480
摘要
Introduction: Cardiac sympathovagal imbalance is a common pathologic finding in patients receiving doxorubicin (DOX), and is considered as a cardiovascular risk factor. Growing evidence demonstrates that cardiac autonomic modulation by vagus nerve stimulation (VNS) exerted cardioprotection in both myocardial ischemia/reperfusion injury and heart failure models. However, the cardioprotection of VNS in DOX-induced cardiotoxicity has never been investigated. Hypothesis: Increased cardiac parasympathetic activity by VNS attenuates the sympathovagal imbalance and mitochondrial dysfunction , thereby improving left ventricular (LV) function. Methods: Rats were divided into a sham group and a VNS group. Two weeks after cervical VNS implantation, all rats were subdivided into 3 groups: control (CON), DOX-treated group (3 mg/kg/day, ip, 6 doses) without VNS (DOX+Sham: DS), and DOX-treated group with VNS (DOX+VNS: DV). VNS was activated simultaneously with the first dose of DOX (20 Hz, 500 μs pulse width, 0.5-0.75 mA, turn ON 14 s and turn OFF 48 s (23% duty cycle), and was maintained for 30 days. At the end of the study protocol, cardiac biochemical and functional analyses were evaluated. Results: DOX treatment increased cardiac mitochondrial ROS production, mitochondrial depolarization, and mitochondrial swelling, leading to left ventricular systolic (%LVFS) and diastolic (E/A ratio) dysfunctions (Fig 1). Moreover, LF/HF ratio was increased in DOX-treated rats, indicating cardiac autonomic imbalance (Fig 1F). Interestingly, VNS could effectively protect the Dox-treated heart by alleviating all of those impaired parameters (Fig 1). Conclusions: VNS protects against DOX-induced cardiotoxicity by improving cardiac mitochondrial function and attenuating cardiac autonomic dysfunctions, leading to improved LV function. Thus, enhancing parasympathetic activity by VNS could be a novel therapeutic approach to prevent DOX-induced cardiotoxicity.
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