An animated education program about cardiac catheterization will be presented 24 hours to children in the intervention group before undergoing cardiac catheterization. While children in the control group will receive routine care. Dependent variables are (Anxiety 2 hours before undergoing cardiac catheterization, hematoma and bleeding at the catheterization site 2 hours post sheath removal, flat time post cardiac catheterization).

After ethical approvals are obtained, to facilitate the process of data collection, the researcher will contact the director of nursing and the head nurse of the pediatric cardiac clinic to inform them about the purpose, protocol, and duration of data collection. All days of the week, excluding holidays and weekends, between the hours of seven AM and four PM, recruitment, intervention, and data collecting will take place. To identify the clinical data regarding the health status of the children who will participate, the researcher will review children's medical records and contact their cardiologists. The researcher will introduce herself to the study participants, a simple explanation of the study's aims without mentioning anxiety level specifically, and the method of data collection will be clarified to gain their approval to participate in the study. Data collection for this study will be carried out for three months. Every child with parents will be interviewed individually by the researcher to collect the necessary data, and the interview will be conducted within 20 minutes. The interview will be classified into four phases (assessment phase, planning phase, implementation phase, and evaluation phase).

Assessment phase In QACHD, the schedule for the CC procedure is informed at 2 pm on the day before CC, when it is confirmed, which children will undergo CC the next day, the following steps will be followed; The researcher will approach the children and parents in the children's rooms and provide them with a description of the study phases. Children who expressed interest in participating in the study and are eligible to participate, researchers will ask their parents to sign the consent form, and the children's assent will also be obtained. The researcher will collect the baseline sociodemographic questionnaire from both study groups (Tool 1). Then randomize study groups for control and intervention as mentioned before.

Implementation phase Usual care will be presented to both study groups by the health team members in the pediatric unit. The researcher will present an animated education program individually to the children in the intervention group 24 hours before undergoing CC. To reduce interruptions during a teaching session and data collecting, a sign stating "Study in progress please do not disrupt" will be posted on the front door of the children's room. The AEP will be loaded on a laptop. The program will be presented in 12 minutes. The animated education program will familiarize children and their parents with the events occurring before, during, and after the post-CC procedure. Children's acquisition of the knowledge and skills taught in the AEP will be evaluated by using the ten-minute discussion that will be offered after they receive intervention from the researcher. Children in the intervention group will be encouraged to ask questions related to the material presented in the AEP. All answers to participants' questions will be provided based on the material available in the literature so that the same questions will be answered in the same way.

Evaluation phase:

After giving standardized instructions to respond to the SASC presented to children, children will be asked to read and answer the Arabic version of the SASC. Children will be informed to ask the researcher's assistance (data collector) to read the tool for them if they find difficulties in reading. Children's anxiety level will be assessed 2 hours before undergoing CC; based on previous literature findings CC-related anxiety is highest on the day of the procedure just before the CC procedure. Vascular complications will be assessed 2 hours post sheath removal by trained staff nurses in the pediatric ward; if vascular complications are present will be confirmed by an expert nurse who works in the CC lab. Flat time will be assessed and will be recorded after admission to the recovery area until physician discharge orders are obtained.

Inclusion Criteria:

• aged between 6-12 years
• admitted for their first scheduled cardiac catheterization non-emergency CC procedure.

Exclusion Criteria:

• children with developmental delay
• emergency CC because
• having major hearing or visual difficulties
• children have deteriorated health conditions before CC and need to be admitted for intensive care before undergoing CC
• children who have bleeding disorders

De-identified data will be uploaded to selected Repository

3 months after completion

on request