INTRODUCTION

Stridor is a variably pitched respiratory sound that results from abnormal air passage during breathing and usually is the most characteristic sign of upper airway obstruction. It is often heard during inspiration (classically caused by supraglottic or glottic obstruction) yet may appear on expiration (caused by obstruction at or below glottic levels and/or severe upper airway obstruction). Stridor caused by congenital anomalies might be present from birth or might appear within days, weeks or months. Different congenital and acquired disorders are common in neonates, infants, children, and adolescents, and must be determined. History, age of the child and physical examination all together usually enable assumed diagnosis. Further investigations might be required to establish a distinct diagnosis, and flexible airway endoscopy is considered the diagnostic approach of choice in the majority of cases in the majority of circumstances.
aim
The main aim of this study was to determine the causes of stridor in early infancy in children attended bronchoscopy unit in Alexandria University Children's Hospital during period from 1st of January 2017 to 31st of December 2019.
Patient
A retrospective study was performed by reviewing the medical records of the children subjected to endoscopy of upper airway at Alexandria University Children's Hospital to determine the cause of stridor from January 2017 to December 2019.