Limitations
Our study is single centre and has relatively small numbers with both prospective and retrospective aspects. Groups were not well matched by demographics, and it remains possible that these differences in RACT were influenced by confounding factors. Missing data on RA and LA volumes prevented more conclusive data interpretation. Atrial flutter is predominately diagnosed in male subjects and women were underrepresented in our sample. Although no statistical sex difference was observed, this should be interpreted with caution given the small sample size.