Effects of potassium aspartate and magnesium on ventricular arrhythmia in ischemia-reperfusion rabbit heart.
The aim of this study was to determine if the potassium aspartate and magnesium (PAM) prevent reperfusion-induced ventricular arrhythmias (RIVA) in ischemia-reperfusion (IR) rabbit heart. Thirty rabbits were randomly divided into control, ischemia and PAM groups. Arterially-perfused rabbit left ventricular preparations were made, and transmural ECG as well as action potentials from both endocardium and epicardium were simultaneously recorded in the whole process of all experiments. In control group rabbit ventricular wedge preparations were continuously perfused with Tyrode's solution, and in ischemia group and PAM groups the perfusion of Tyrode's solution was stopped for 30 min. Then the ischemia group was reperfused with Tyrode's solution and the PAM group with Tyrode's solution containing 2.42 mg/L PAM, respectively. ECG, QT interval, transmural repolarization dispersion (TDR) and action potentials from epicardium and endocardium were simultaneously recorded, and the RIVA of the wedge preparation was observed. Compared with control group, TDR and incidence of RIVA were significantly increased in ischemia group (P<0.05). The incidence of RIVA in control, ischemia and PAM group was 0/10, 9/10 and 1/10, respectively. Compared with ischemia group, TDR and incidence of RIVA were significantly reduced in PAM group (P<0.05). Potassium aspartate and magnesium significantly reduce TDR and prevent ventricular arrhythmia in ischemic rabbit heart.
Department of Cardiology, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200001, China. heben@medmail.com.cn
Jun
J
Pu
Cuntai
C
Zhang
Xiaoqing
X
Quan
Guoan
G
Zhao
Jiagao
J
Lv
Bo
B
Li
Rong
R
Bai
Nian
N
Liu
Yanfei
Y
Ruan
Ben
B
He
D000818:Animals; D001145:Arrhythmias, Cardiac / Q000209:etiology / Q000517:prevention & control*; D005260:Female; D008297:Male; D017202:Myocardial Ischemia / Q000150:complications* / Q000503:physiopathology; D015428:Myocardial Reperfusion Injury / Q000150:complications*; D011195:Potassium Magnesium Aspartate / Q000627:therapeutic use*; D011817:Rabbits; D011897:Random Allocation
D011195:Potassium Magnesium Aspartate