This week we review a novel paper on MRI changes observed in TOF adults. Are these signs for advanced brain 'aging' in tetralogy adults? We also review a prospective trial of different mechanical ventilation strategies during SVT ablations in children. Can tidal volume or PEEP affect catheter stability while mapping or ablating SVT? We discuss this question with the first author of this work, Dr. Christopher Janson, Assistant Professor of Pediatrics at The Children's Hospital of Philadelphia. Articles: DOI: 10.1371/journal.pone.0202496; DOI: 10.1007/s00246-018-1968-7