{
  "abstract": "Introduction Neo-aortic dilatation is a commonly reported finding after arterial switch operation (ASO) for transposition of the great arteries (d-TGA). Long-term changes in neo-aortic dimensions remain scarcely reported. Dissection risk remains unknown and applying conventional guidelines for this patient group remains topical.Aims We aimed to review neo-aortic dimensions, and changes with time, alongside baseline characteristics for a group of post ASO patients attending an adult congenital heart disease clinic (ACHD, >16 years age) in our tertiary ACHD centre.Methods Data was obtained via our dedicated ACHD clinic database, our dedicated imaging platforms and our national electronic care record. Statistical analysis was performed using SPSS version 30.Results 27 patients in total, 70% male (19), mean age 25 ±4.8 years, mean blood pressure at last clinic review 124/70 mmHg. All patients, except one, had available echocardiographic data for analysis and 89% (24) patients had at least one cross-sectional imaging modality performed during follow-up (23 MRI, 1 gated CT at baseline scan).The maximum neo-aortic diameter on the initial cross-sectional imaging was 33.4 ±5 mm (range 23–42 mm) and 34% patients had mild aortic regurgitation with no moderate or severe regurgitation observed.Of the 24 patients that had initial cross-sectional imaging performed, 11 had available further cross-sectional imaging for comparison. The mean absolute neo-aortic diameter in these patients was 36.3 ±7 mm (range 29–49 mm) , with a mean overall increase of 4 ±3.7 mm (figure 1.(range -1 to 10 mm) over a median interval scanning time-frame of 76 months (range 25–123 months) thus less than 1 mm growth per annum on average. The reasons for the limited number interval cross-sectional scans include not meeting conventional indications (normal echocardiography of good quality), waiting times and non-attendances.Of note for the 26 patients that had recent transthoracic echocardiographic data available, the mean maximum neo-aortic dimension was 34 ±4.6 mm (range 25–42 mm) with a median time interval between echocardiography and cross-sectional imaging of 25 months (IQR 16.5–36 months).Aortic dissection was not seen in any patient. Only 2 patients had moderate neo-aortic regurgitation on last imaging with the remainder being mild or less. No coronary complications from anomalous post-implantation were reported.Abstract 1-009 Figure 1Conclusion In this group of young normotensive ASO patients, neo-aortic growth was seen in the majority of patients, albeit at a slow rate. While no patients had reached cut-off indications for neo-aortic intervention, longer-term follow-up is required to definitively assess the trajectory of growth, alongside the potential clinical sequelae.",
  "authors": [
    {
      "affiliations": [
        "Department of Cardiology, Royal Victoria Hospital, Belfast Health and Social Care Trust, Belfast, UK"
      ],
      "name": "Zeena Cartwright-Shamoon"
    },
    {
      "affiliations": [
        "Department of Cardiology, Royal Victoria Hospital, Belfast Health and Social Care Trust, Belfast, UK"
      ],
      "name": "Paul F Brennan"
    }
  ],
  "title": "1-009 Neo-aortic dimensions after arterial switch operation, over time, in transposition of the great arteries patients",
  "uid": "6203916e-fa52-5c66-b451-4ccb7e8ab107"
}