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Funding Acknowledgements Type of funding sources: None. Background "Legacy" cardiac implantable electronic devices (CIEDs) have historically been considered non-MRI-conditional. However, a number of recent studies indicate that if certain protocols are followed, patients with such devices may undergo MRI without significant adverse outcomes. Nowadays, industry standards dictate that "modern" CIEDs are MRI compatible. Despite these developments, some patients with CIEDs are denied MRI. Paucity of access to this vital service has been shown to increase expense, lead to more invasive imaging and later diagnosis, and poorer patient outcomes.  This study aims to identify if Australian public hospitals provide MRI services for patients with modern and legacy CIEDs, the characteristics of the services, and the barriers to implementing such a service.  Methods This study surveyed all Australian Tertiary Referral Public Hospitals (n = 38), with a mixed qualitative and quantitative questionnaire.  Results 35 of the 38 sites completed the survey. Figure 1A shows that the majority of hospitals (30/35, 85.7%) offer MRIs for modern MRI-conditional CIEDs. In contrast, Figure 1B shows that only a minority of hospitals (3/35, 8.6%) offer MRIs for legacy CIEDs.  Protocols governing patient eligibility vary greatly among hospitals that scan modern devices. Locations either allow all CIEDs to be scanned, only non-dependent CIEDs, or only pacemaker CIEDs. 1.5 Tesla is the preferred strength to scan Modern CIEDs (59%), however a sizeable proportion scan at only 3.0 Tesla (10%) or both strengths (31%). A majority (80%) of staff in attendance of the scan were ACLS-trained (Advanced Cardiac Life Support), with no correlation to strength of MRI used. A range of different personnel attend the scan with varied patient monitoring strategies, and a majority (79%) offer thoracic as well as extra-thoracic scanning.  The few hospitals that scan legacy devices only scan at 1.5 tesla, and follow individualised protocols. These sites offer more personnel in attendance for the scan than for modern CIED scans, with all staff ACLS-trained including a physician who can direct CIED programming of required. These sites have more involved patient monitoring, and all also offer thoracic and extra-thoracic MRI scanning.  The predominant barrier identified was an absence of National Guidelines, followed by a lack of formal training or logistical device support. Conclusions The majority (85.7%) of Australian Tertiary Referral Public Hospitals have a MRI service for patients with modern CIEDs, but only 8.6% offer this service to patients with legacy CIEDs.  This highlights the need for a national effort to guide the provision of MRI services for patients with CIEDs, and address the identified barriers.

Assessing access to mri in patients with cardiac implantable electronic devices in australia