Okay, the user wants me to translate "right-sided heart" into Thai. Let me check the rules again. The first rule says to translate all content into Thai. The second rule states if the content is already in Thai, leave it as is. The third rule is to provide only the translation without explanations.
So, "right-sided heart" is in English, so I need to translate it. The term "right-sided" would be "ด้านขวา" in Thai. "Heart" is "หัวใจ". Putting it together, it should be "หัวใจด้านขวา". Let me make sure there's no existing Thai term that's more commonly used. Maybe "หัวใจข้างขวา" could be another way, but "ด้านขวา" is more straightforward. I think "หัวใจด้านขวา" is correct. No need for explanations, just the translation.