A case of HornerÓ?s syndrome following ultrasound-guided supraclavicular block in a pediatric patient

Horner's syndrome is a clinical manifestation of sympathetic nerve dysfunction (stellate ganglia).The underlying pathophysiology is the interruption of the sympathetic nerve fibers originating from the cervical sympathetic chain.This can occur due to various etiologies, including surgical trauma, neoplasia, or, as in this case, inadvertent spread of local anesthetic into deep neck compartments during regional anesthesia procedures.We present a case of a pediatric patient who developed Horner's syndrome following an ultrasound-guided supraclavicular block.The patient presented to the post-anesthesia care unit with the characteristic ptosis, miosis, on the affected side.Notably, no other side effects were observed.The clinical signs of Horner's syndrome resolved completely within 8 h.It is crucial for anesthesiologists to be aware that Horner's syndrome is a known potential complication of brachial plexus blocks.Patients should be informed about this possibility and reassured that the condition is typically transient and benign.