title: Public access defibrillation remains out of reach for most victims of out-of-hospital sudden cardiac arrest.
abstract: BACKGROUND
  Public access defibrillation (PAD) prior to ambulance arrival is a key determinant of survival from out-of-hospital (OOH) cardiac arrest. Implementation of PAD has been underway in the UK for the past 12 years, and its importance in strengthening the chain of survival has been recognised in the government's recent 'Cardiovascular Disease Outcomes Strategy'. The extent of use of PAD in OOH cardiac arrests in the UK is unknown. We surveyed all OOH cardiac arrests in Hampshire over a 12-month period to ascertain the availability and effective use of PAD.
  
  
  METHODS
  A retrospective review of all patients with OOH cardiac arrest attended by South Central Ambulance Service (SCAS) in Hampshire during a 1-year period (1 September 2011 to 31 August 2012) was undertaken. Emergency calls were reviewed to establish the known presence of a PAD. Additionally, a review of all known PAD locations in Hampshire was undertaken, together with a survey of public areas where a PAD may be expected to be located.
  
  
  RESULTS
  The current population of Hampshire is estimated to be 1.76 million. During the study period, 673 known PADs were located in 278 Hampshire locations. Of all calls confirmed as cardiac arrest (n=1035), the caller reported access to an automated external defibrillator (AED) on 44 occasions (4.25%), successfully retrieving and using the AED before arrival of the ambulance on only 18 occasions (1.74%).
  
  
  CONCLUSIONS
  Despite several campaigns to raise public awareness and make PADs more available, many public areas have no recorded AED available, and in those where an AED was available it was only used in a minority of cases by members of the public before arrival of the ambulance. Overall, a PAD was only deployed successfully in 1.74% OOH cardiac arrests. This weak link in the chain of survival contributes to the poor survival rate from OOH cardiac arrest and needs strengthening.
authors.affiliation: South Central Ambulance Service, , Otterbourne, UK.
authors.forename: Charles D
authors.initials: CD
authors.lastname: Deakin
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Shewry
authors.forename: Huon H
authors.initials: HH
authors.lastname: Gray
mesh_terms: D047548:Defibrillators; D004554:Electric Countershock / Q000009:adverse effects / Q000295:instrumentation / Q000401:mortality; D004632:Emergency Medical Services; D004739:England; D019538:Health Care Surveys; D007722:Health Knowledge, Attitudes, Practice; D006293:Health Promotion; D006297:Health Services Accessibility; D006301:Health Services Needs and Demand; D006801:Humans; D058687:Out-of-Hospital Cardiac Arrest / Q000401:mortality / Q000628:therapy*; D011634:Public Health; D012189:Retrospective Studies; D016019:Survival Analysis; D015996:Survival Rate; D013997:Time Factors; D016896:Treatment Outcome