Okay, the user wants me to translate "right-sided heart" into Japanese. Let me think about the correct medical term here. In Japanese, the right side of the heart is typically referred to as 右心 (みかばね). I should confirm if that's the standard term used in medical contexts. Yes, 右心 is the correct term. Since the original content isn't in Japanese, I need to translate it. The user specified to provide only the translation without any explanations, so I'll just output 右心.