AED to denkyokupaddo wo tukau.

Yes—by itself, that is strange. A sentence normally would not begin with と unless it is continuing from something before it.

Here, と is most likely connecting a previous noun to 電極パッド:

• A と 電極パッドを使う
• Use A and electrode pads

So this looks like an excerpt, not a fully self-contained sentence. The part before と has probably been omitted because it was already mentioned earlier.

In this sentence, と is most naturally the particle that connects nouns.

So:

• A と B = A and B

That means と is linking some earlier noun with 電極パッド.

Depending on the English translation, this may sometimes come out as with, but grammatically the Japanese と here is just joining nouns. It is not the quotation と, and it is not the conditional と meaning when/if.

No. When two nouns are joined together, they can form one combined noun phrase, and that whole phrase gets one を.

For example:

• ジェルと電極パッドを使う
• Use gel and electrode pads

Here, ジェルと電極パッド is the full object, and を marks that entire object phrase.

This is similar to English use gel and electrode pads—you do not need to mark each item separately in Japanese.

を marks the direct object of the verb 使う.

• 使う = to use
• the thing being used gets を

So in the full phrase, whatever is connected by と plus 電極パッド is what is being used.

Structure:

• [object] を 使う
• use [object]

It is read:

• でんきょくパッド

Breakdown:

• 電極（でんきょく） = electrode
• パッド = pad

So it is a mixed-script technical term: kanji + katakana.

That is very common in Japanese, especially for medical, scientific, or technical vocabulary.

Because the two parts come from different sources:

• 電極 is a standard Japanese/Sino-Japanese technical word, so it is written in kanji.
• パッド is a loanword from English pad, so it is written in katakana.

Japanese often combines these like this:

• 電極パッド
• コンピューター室
• レーザー治療

So this spelling is completely normal.

Because Japanese normally puts the verb at the end of the clause.

So where English says:

• use electrode pads

Japanese says:

• 電極パッドを使う

This is a basic Japanese word-order pattern:

• subject/topic + object + verb

In this case, the subject is omitted, which is also very common in Japanese.

使う is the plain form, while 使います is the polite form.

Both are grammatically correct, but they are used in different situations:

• 使う: plain, neutral, dictionary form; common in manuals, labels, instructions, notes, and casual style
• 使います: polite; common in normal conversation or polite written explanation

So if this comes from a manual, diagram, checklist, or short instruction, 使う is very natural.

Probably yes.

Japanese often omits information that is clear from context, especially:

• the subject or topic
• repeated nouns
• words already shown in a previous line

So the full idea may be something like:

• [You / the operator / the device] use A and electrode pads

But Japanese often leaves those parts unstated if the context already makes them obvious.

That is why this line feels shorter and less explicit than an English sentence.