Among scheduled children for cardiac catheterization at the Labatt Family Health Center Cardiac Diagnostic and Interventional Unit (CDIU) , potential participants will be identified at their pre-catheterization clinic visit, the study explained, and informed consent obtained. On the day of their procedure, participants will be randomized to one of 4 groups. In the pre-catheterization work-up area, a modified Yale Preoperative Anxiety Scale (mYPAS) plus anxiety and pain self-ratings on verbal 0-10 scales will be obtained. In intervention groups A and C a pre-procedure Comfort Talk script will be read while the parent or guardian is present. Patients in Group B and D will not have a script read. The participants will be reassessed by mYPAS and asked to rate their level of pain and anxiety again on entering the procedure room and then care will continue as usual. The team members and anaesthesiologist will be blinded to the prior treatment and behave naturally but abstain from formalized use of hypnosis, invitation to imagery, use of scripts or electronic means of distraction. Induction of anaesthesia and the procedure will continue according to laboratory routine. Use of premedication will be permitted as per judgement of the anaesthesiologist. After induction a Paediatric Anesthesia Behaviour score (PAB) rating will be obtained. Prior to extubation, one of the CDIU nurses will read the pre-extubation script for those subjects in Groups B and C. Extubation and transfer to recovery will follow usual routine.