Study population
We conducted a retrospective study including every consecutive ablation
procedure of AF or atrial tachycardia (AT) using the Rhythmia™ system at
both University Hospitals of Caen and Toulouse from August 2015 to April
2018. We considered de novo and redo procedures, paroxysmal and
persistent AF and AT. AT was defined as organized atrial activity on 12
lead ECG and electrophysiological study demonstrating macro/micro
reentrant or focal mechanism. We excluded AT displaying ECG pattern of
typical cavotricuspid dependant atrial flutter.: Patients with reduced
left ventricular ejection fraction (LVEF) (i.e. <50%), or
with preserved LVEF and signs/symptoms of HF and evidence for cardiac
structural of functional abnormalities (elevated filling pressures,
natriuretic peptides) were designated the HF group, and the remaining
patients constituted the non-HF group.12 HF patients
were divided into subgroups based on LVEF : reduced or mildly reduced
LVEF (HFrEF) if LVEF<50%, and HFpEF if LVEF≥50%.