AST Surgical Technologist Practice Exam 2026 – Complete All-in-One Guide for Exam Success

In pediatric patients experiencing upper respiratory infections, the nasolacrimal duct is particularly susceptible to blockage or dysfunction, which may manifest as excessive tearing or discharge from the eyes. This anatomical structure is responsible for draining tears from the eyes into the nasal cavity. Upper respiratory infections can lead to inflammation and increased production of mucus, contributing to this blockage.

Probing and dilating the nasolacrimal duct can help in managing complications associated with upper respiratory infections in children, such as dacryocystitis (an infection of the tear sac) or persistent epiphora (excessive tearing). The procedure helps reopen the duct to restore proper drainage and alleviate symptoms.

In contrast, while the nasal cavity, pharynx, and trachea are all involved in respiratory function and can be affected during infections, they do not specifically require probing and dilating as part of the management for issues typically arising from upper respiratory infections.