Inclusion Criteria:  Ability to give informed consent Age 18-80 years First time PAF ablation  Exclusion Criteria:  Creatinine clearance (eGFR) < 30mls/min Contraindication or unable to take anticoagulation Uncontrolled hypertension Contraindication for catheter ablation BMI > 35 Haemodynamically unstable Recent Stroke/ myocardial infarction Significant carotid artery stenosis Significant carotid artery stenosis or peripheral arterial disease Allergy to contrast Presence of pacemaker or implantable cardioverter defibrillator (ICD)