How to Use a Mediana AED in a Cardiac Emergency

In this guide, we’ll show you how to use a Mediana Automated External Defibrillator (AED) during a cardiac emergency. We are demonstrating the semi-automatic Mediana A16, but most Mediana models work in a similar way. Please note: this is a simulation — you should never use a live AED or perform CPR unless it is a real emergency.

Initial Scene Assessment

• Approach the scene carefully and check for dangers to yourself or others. Stop, think, and act.
• If gloves are available, wear them — but don't waste time if they are not, as time is critical.

Assessing the Casualty

• Attempt to get a response by speaking loudly and gently shaking the person's shoulders.
• Open the airway and check for obstructions.
• Look, listen, and feel for normal breathing for up to 10 seconds.

If they are not breathing or are breathing abnormally, start CPR immediately.

Call for Help and Get the AED

• If someone is with you, ask them to call emergency services (999) and fetch the AED.
• If you are alone, call 999 yourself — use speakerphone so you can continue chest compressions.
• Continue CPR until the AED arrives.

Using the Mediana AED

Step-by-Step Instructions

1. Turn on the AED by pressing the power button. The voice prompts will guide you.
2. Expose the chest — remove or cut away clothing, including bras and anything obstructing pad placement.
3. Check for pacemakers or surgical scars — avoid placing pads directly over them.
4. Remove any medical patches that may contain metal.
5. If you have an AED prep kit:
   • Use a razor to remove excessive chest hair if needed (only if it prevents pad contact).
   • Remove necklaces and jewellery from the chest area.

Pad Placement

• Adult pad position:
  • One pad goes just below the collarbone on the right side of the chest.
  • The other pad goes on the side of the chest, under the left armpit.
• Child pad position: One pad on the front of the chest, the other on the back — refer to the diagrams on the pads.

Press the pads firmly to ensure full contact with the skin for effective shock delivery.

Analysing and Delivering the Shock

• Once the pads are placed, the AED will automatically analyse the heart rhythm.
• Do not touch the patient — clearly state “Everyone stand clear.”
• If a shock is advised:
  • Semi-automatic AED: Press the shock button when prompted.
  • Fully automatic AED: The device will deliver the shock automatically.

If no shock is advised, resume CPR immediately and follow the AED voice instructions.

Continuing CPR with the AED

• The AED provides a metronome to guide compressions at 100–120 per minute.
• Give 30 compressions followed by 2 rescue breaths, if trained and confident.
• If not confident with rescue breaths, perform hands-only CPR.
• The AED will re-analyse the heart rhythm approximately every two minutes.
• Continue to follow prompts until emergency services arrive or the patient shows signs of life.

If You're Alone

If you’re by yourself, continue until help arrives or you physically cannot continue. Acting quickly and applying an AED as soon as possible significantly increases survival rates.

Final Tips

• Remain calm — the AED will guide you step-by-step.
• Trust the voice prompts, even if you’re unfamiliar with the specific AED model.
• All AEDs work in a similar way — just turn them on and follow the instructions.

Conclusion

Using an AED is safe and simple. While it might seem daunting, these devices are designed to be intuitive, even for those with no medical training. With early CPR and defibrillation, you can save a life. Stay calm, act fast, and let the AED guide you through the emergency.