The correct spelling for the medical term "Backstoke of the heart" is actually "Backward Flow of Blood in the Heart." The confusion around the spelling arises from the similar-sounding words "backstroke" and "backflow." The pronunciation for this term, using IPA phonetic transcription, is /ˈbæk.wərd floʊ əv blʌd ɪn ði hɑːrt/. It is essential to use the correct spelling in medical terminology to ensure effective communication among healthcare professionals and reduce the risk of confusion or errors.