Prevention of Arrhythmia in Rats by Puhuang Protection of extract from pigeonpea leaves on myocardial ischemia reperfusion injury in rats Study on effect of total flavonoids from Scutellaria amoenaon experimental arrhythmia Effect of shensongyangxin capsule on myocardial remodeling and ventricular fibrillation threshold value in rat with coronary artery ligation