How the HWD Works

  • The Hospital Wearable Defibrillator (HWD) is a tool for managing patients at risk for cardiac arrest. It provides patients with extra protection and monitoring as well as peace of mind.
  • Unlike an implantable cardioverter defibrillator (ICD), the HWD is worn outside the body rather than implanted in the chest. This device continuously monitors the patient's heart with adhesive electrodes.

When a Minute Matters

With each minute that passes after the start of cardiac arrest, the chance of survival decreases by 10%.1 The HWD complements the hospital's resuscitation protocol and provides timely defibrillation. 

The HWD is designed to deliver treatment during ventricular fibrillation as follows:

 How the HWD Works - Treatment Timeline

1. Arrhythmia detected, siren alert activated
2. Patient audible prompt begins:
    "Press response buttons"

3. Bystander audible prompt:
    "Bystander, do not interfere"

4. Treatment shock

If the arrhythmia continues after the first treatment shock, the sequence repeats. Multiple shocks may be given.

Entire event (arrhythmia detection to treatment shock) typically occurs in less than one minute.

1Larsen MP, et al. Ann Emerg Med. 1993;22: 1652–58.