The Third Hospital of Hangzhou City 1 article published in JoVE Medicine Assessment of Sarcoplasmic Reticulum Calcium Reserve and Intracellular Diastolic Calcium Removal in Isolated Ventricular Cardiomyocytes Jing Gao*1, Xiaolu Shi*2, Hong He1, Juhong Zhang1, Ding Lin3, Guosheng Fu1, Dongwu Lai1 1Department of Cardiology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, 2Experimental Research Center, China Academy of Chinese Medical Sciences, 3Department of Cardiology, The Third Hospital of Hangzhou City Intracellular calcium recycling plays a critical role in regulation of systolic and diastolic function in cardiomyocytes. Here, we describe a protocol to evaluate sarcoplasmic reticulum Ca2+ reserve and diastolic calcium removal function in cardiomyocytes by a calcium imaging system.