denkisyokku no mae ni, syoubyousya ni denkyokupaddo wo tukeru.

It is read:

でんきショック の まえ に、しょうびょうしゃ に でんきょくパッド を つける。

Word by word:

• 電気ショック = でんきショック
• 前 = まえ
• 傷病者 = しょうびょうしゃ
• 電極パッド = でんきょくパッド
• 付ける = つける

This is the pattern A の 前に, which means before A.

Here:

• 電気ショック = the electric shock
• の links the noun to 前
• 前 literally means front or before
• に marks the time point for the action that follows

So 電気ショックの前に means before the electric shock or more naturally before delivering the shock.

With 付ける, the thing being attached takes を, and the person or place it is attached to takes に.

So the pattern is:

X を Y に 付ける = attach X to Y

In this sentence:

• 電極パッドを = the electrode pads
• 傷病者に = to the casualty/patient

So 傷病者に marks the target of attachment.

を marks the direct object of the verb.

Here, the direct object is the thing being attached, so:

• 電極パッドを = the electrode pads

This matches the pattern:

電極パッドを 傷病者に 付ける
= attach the electrode pads to the casualty

Also, Japanese nouns usually do not show singular/plural clearly, so 電極パッド can mean pad or pads depending on context. Here it naturally means pads.

Yes. In this sentence, 付ける means attach, put on, or apply.

That verb can have several meanings in Japanese depending on context, such as:

• attach
• put on
• add
• switch on

But here, because the object is electrode pads, the meaning is clearly attach/apply.

It is a broad, common verb. A more technical or formal manual might sometimes use a verb like 装着する, but 付ける is very natural and easy to understand.

Japanese often uses the plain non-past form in manuals, instructions, and procedure steps.

So 付ける here does not sound like a casual statement such as I attach. In this kind of context, it works like a neutral instructional style:

• Attach the pads
• One attaches the pads
• The pads are attached

English often prefers the imperative in instructions, but Japanese frequently uses the plain form for a matter-of-fact procedural tone.

The subject is omitted because it is understood from context.

In a first-aid or AED instruction, the implied subject is usually:

• you
• the rescuer
• the person performing the procedure

Japanese very often leaves out subjects when they are obvious. So even though the sentence does not explicitly say you attach the pads, that is what is understood.

傷病者 is a formal first-aid/emergency term meaning an injured or ill person.

It is made up of:

• 傷 = injury, wound
• 病 = illness
• 者 = person

So it literally means injured/sick person.

This is different from 患者, which usually means patient in a medical setting.
傷病者 is especially common in emergency, rescue, disaster, and first-aid language, because the person may not yet be a hospital patient.

You are right: normal Japanese is usually written without spaces.

The spaces here are probably added:

• for learners
• for readability
• for training or safety materials

So this sentence would normally appear more like:

電気ショックの前に、傷病者に電極パッドを付ける。

The comma after 前に is also just a pause marker to make the sentence easier to read.