Complications during Fiberoptic Endoscopic Evaluation of Swallowing in 5,680 Examinations

To evaluate retrospectively the incidence of complications during fiberoptic endoscopic evaluation of swallowing (FEES) in 5,680 examinations.

5,680 patients were evaluated at the Department of Otorhinolaryngology, Audiology and Phoniatrics of Pisa University Hospital between January 2014 and December 2018, involving both inpatients and outpatients. Most common comorbidities included neurological pathologies such as stroke (11.8%), neurodegenerative diseases (28.9%) and a history of previous head and neck surgery (24.6%). The evaluation was conducted by clinicians with experience in swallowing for a minimum of 10 years with the assistance of one or more speech-language pathologists.

In all patients studied the endoscope insertion was tolerated, and it was possible to visualize the pharyngolaryngeal structures. Three subjects refused to undergo the procedure after being informed regarding the protocol and were therefore not included in this study. Most patients reported discomfort (70.1%) and gagging (20.8%). In a minority of patients complications were recorded, such as anterior epistaxis (0.1%), posterior epistaxis (0.02%), vasovagal crises (0.08%) and laryngospasm (0.04%). Especially laryngospasm was recorded in patients affected by amyotrophic lateral sclerosis. Multivariate binary logistic regression showed that discomfort (OR 9.944; CI 7.643-12.937), chronic gastrointestinal diseases (OR 2.003; CI 1.518-2.644), neurodegenerative diseases (OR 1.550; CI 1.302-1.846) and brain tumors (OR 1.577; CI 1.179-2.111) were risk factors associated with minor complications.

FEES proved to be easy to perform, well tolerated by the patients and cost-effective. It can be performed at the patient's bedside, and it is characterized by a low rate of complications. As a matter of fact, normally only discomfort, gagging and/or vomiting are reported. Complications occurred only rarely, such as anterior or posterior epistaxis episodes or vasovagal crises, but these are still easily managed. Exceptionally, more severe complications are reported: adverse drug reactions to substances such as blue dye (methylene blue) and local anesthetics (not used in our protocol), and laryngospasm.