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Australia has about 26,000 out-of-hospital cardiac arrests annually, with only 12% of patients treated by ambulance surviving to hospital discharge and/or 30 days.

Now, a new study led by has identified Australian regions with high incidence of out-of-hospital cardiac arrest (OHCA) and low rates of bystander cardiopulmonary resuscitation (CPR).

Funded by the and conducted by the , the study is prompting calls for targeted education campaigns to improve awareness about avoiding and treating heart issues.

Cardiac arrest survival depended on a series of interventions known as the Chain of Survival, said senior author Professor Janet Bray, from Monash University鈥檚 School of Public Health and Preventive Medicine, and Curtin University鈥檚 Prehospital, Resuscitation and Emergency Care Research Unit.

鈥淓arly bystander CPR is one of the most important of these interventions. Survival is doubled when cardiopulmonary resuscitation (CPR) is given by bystanders,鈥� Bray said.

The research identified 60 high-risk LGAs with a total population of 1.17 million, mainly in New South Wales. They were typically in regional and remote areas, except for two in Adelaide and two in Perth.

High-risk LGAs were those with an incidence rate greater than its state or territory鈥檚 75th percentile and a bystander CPR rate less than the state or territory鈥檚 25th percentile, the researchers found. A total of 62,579 OHCA cases attended by ambulance across 543 LGAs nationwide were included.

Nationally, the OHCA incidence rate across LGAs ranged from 58.5 to 198.3 per 100,000 people, while bystander CPR rates ranged from 45% to 75%. Bray said the results showed that OHCA incidence and bystander CPR rates varied markedly across Australian LGAs, making targeted education campaigns in areas of high risk crucial.

Published in PLOS ONE, the retrospective, observational study used data from the Aus-ROC Australian and New Zealand OHCA Registry to map OHCA by local government area (LGA) from 2017 to 2019. It applied mathematical models and mapping techniques to estimate incidence and bystander CPR ability rates for witnessed events in each LGA.

Earlier Aus-ROC research with Ambulance Victoria found that Victorian regions with high rates of OHCA had populations with higher rates of cardiovascular risk factors such as being older, lower socioeconomic status and education levels, and higher smoking rates.

OHCA incidence fell during the Heart Foundation鈥檚 Warning Signs campaign for heart attacks, the researchers said, noting that this suggests that when people act quickly when having heart attack symptoms, such as chest pain, they can avert having a cardiac arrest.

鈥淲hereas regions with higher bystander CPR had higher rates of CPR training,鈥� Bray said.

鈥淎mbulance Victoria and the Heart Foundation have since provided community education in these regions in their Heart Safe Community initiative.

鈥淲hat this whole body of work shows us is that we can improve OHCA outcomes with public education and we can now target public education in areas with the greatest need across the whole of Australia.

鈥淢any of the high-risk regions are in regional and remote areas. We are currently completing research in NSW to explore community-based approaches which are best suited to improving OHCA outcomes in regional communities, and a pilot in Victoria teaching high school students how to save a life.鈥�

While similar analysis has been conducted on regional OHCA variations across Queensland and Victoria, this is the first study to apply these methods across all Australian states and territories.

Organisations involved included Monash University, Curtin University, Queensland University of Technology, Auckland University of Technology, Queensland Ambulance Service, St John Western Australia, NSW Ambulance, Ambulance Victoria, SA Ambulance Service, St John Ambulance NT, ACT Ambulance and Ambulance Tasmania.

Image caption: iStock.com/magicmine