Abstract
A woman in her 70s presented to accident and emergency (A&E) with shortness of breath and fever following atrial flutter ablation. Initial investigations revealed a new onset of pleural and pericardial effusion with raised inflammatory markers. After systematically ruling out chest infection and heart failure, a diagnosis of post-cardiac injury syndrome (PCIS) was made. After a short course of steroids and colchicine, she showed significant improvement in her symptoms, and subsequent follow-up showed resolution of her pleural and pericardial effusion.