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irregular pulse; arrhythmia
不整脈が心配なので、近いうちに病院で検査を受ける予定だ。
As I'm worried about arrhythmia, I plan to get an examination at the hospital soon.
医師が不整脈の治療法を詳しく説明した。
The doctor explained the treatment method for arrhythmia in detail.
彼の不整脈が悪化し、手術が必要となった。
His arrhythmia worsened, and surgery became necessary.