Background: Patients' satisfaction represents an important indicator for the quality of health care delivery, and it is a widely accepted factor, which needs to be studied repeatedly for better functioning of health care systems. Patient is the best judge for the quality of health care so the factors affecting patients' satisfaction must be taken in consideration. Objective: The aim of this study was improvement of quality of the health care services provided to children in Pediatric Zagazig University Hospital. Patients and methods: This study was a cross sectional study that was held a sample of Cardiology Unit at Pediatric Department of Zagazig University Hospitals. It was carried out during the period from July 2018 to April 2019 on a total sample of 106 patients attending Zagazig University Hospital Cardiology Unit at Pediatric Department. Results: Among 106 participants 100% were females, 70.8% were secondary educated, 73.5% were non-workers, 55.7% were of low social class, 69.8% were from rural resident and 76.4% had not enough income with mean age of 24.48 ± 4.5 years. It was concluded that most of the studied patients (89.6%) were satisfied about the studied cardiology unit at pediatric department. It was found that patient satisfaction is affected by sociodemographic factors as age, sex, occupation, education, and social class. In addition, it was affected by satisfaction about environment, facilities, treatment, doctors, nurses, administrative personnel and information given for them. Conclusion: It was concluded that most of the studied patients are loyal to Zagazig University Hospital, as they will definitely intend to reuse and recommend Zagazig University Hospital Outpatient Clinics to others. Patient loyalty was found to be significantly affected by level of their satisfaction where satisfied patients tend to re-use and recommend the hospital Cardiology Unit at Pediatric Department more than dissatisfied ones.