shinpaisosei no renshuu ni saishite, kokyuu no kakunin o suru.

During CPR practice, I check for breathing.

Breakdown of shinpaisosei no renshuu ni saishite, kokyuu no kakunin o suru.

• を: direct object particle
• の: possessive case particle
• する: to do
• 練習れんしゅう: practice

Questions & Answers about shinpaisosei no renshuu ni saishite, kokyuu no kakunin o suru.

How do you read this sentence?

A natural reading is:

しんぱいそせい の れんしゅう に さいして、こきゅう の かくにん を する。

Word by word:

• 心肺蘇生（しんぱいそせい）= CPR / cardiopulmonary resuscitation
• 練習（れんしゅう）= practice, training
• に際して（にさいして）= on the occasion of / when / in doing
• 呼吸（こきゅう）= breathing / respiration
• 確認（かくにん）= confirmation, checking
• をする = do, perform

What does に際して mean here?

に際して is a formal expression meaning something like:

• when
• at the time of
• on the occasion of
• in carrying out

So 練習に際して means when doing the practice or in the course of the practice.

In this sentence, it gives a formal, instructional tone. It sounds more official than a simple 〜とき.

Compare:

• 心肺蘇生の練習をするとき、呼吸の確認をする。
  = When practicing CPR, check breathing.
  → more plain and conversational
• 心肺蘇生の練習に際して、呼吸の確認をする。
  = When conducting CPR practice, perform a breathing check.
  → more formal, like a manual or instruction

Why is it 心肺蘇生の練習 and not something with を?