Empty Nose Syndrome Pathophysiology: A Systematic Review

The research article presents a systematic review of the pathophysiology of Empty Nose Syndrome (ENS), a condition characterized by paradoxical nasal obstruction and a sensation of emptiness in the nasal cavity, often following surgical interventions aimed at relieving nasal obstruction. The review aimed to consolidate existing knowledge regarding the mechanisms underlying ENS, which remain poorly defined despite significant research efforts.

The authors conducted a comprehensive search of the literature, yielding 2,476 studies after removing duplicates. Ultimately, 19 studies were included in the qualitative analysis. These studies varied in design, including case-control and cross-sectional studies, and involved a total of 489 adult patients diagnosed with ENS. The definition of ENS varied across studies, with some relying on self-identification, while others used specific questionnaires like the Empty Nose Syndrome 6 Questionnaire (ENS6Q) or defined it by the presence of paradoxical obstruction.

Key findings from the review highlighted several important themes:

Symptomatology: Patients with ENS reported a range of symptoms, including nasal obstruction, dryness, and a lack of sensation. The severity of these symptoms was often comparable to those experienced by patients with chronic rhinitis, indicating a significant impact on quality of life.

Mental Health: A notable correlation was found between ENS symptoms and mental health issues, such as anxiety and depression. The burden of these psychological conditions was significant, with some patients experiencing severe distress and a diminished quality of life.

Anatomical and Physiological Changes: The review noted that while patients with ENS often had a patent nasal airway, structural changes in the nasal cavity could still be present. However, the relationship between these anatomical changes and the symptoms of ENS was not straightforward, as many patients did not exhibit typical signs of nasal obstruction.

Airflow Dynamics: The influence of altered airflow on the perception of nasal patency was discussed, with some theories suggesting that changes in airflow dynamics could contribute to the sensation of emptiness experienced by ENS patients.

Neurosensory Dysfunction: The review also explored the possibility of neurosensory decline, where patients may have an altered perception of nasal sensations, leading to the symptoms associated with ENS.

Psychogenic Factors: Psychogenic dysfunction was identified as a potential contributor to ENS, with some patients experiencing heightened awareness of their symptoms, which could exacerbate their condition.In conclusion, the systematic review underscored the complexity of ENS, revealing that it is not merely a result of anatomical changes following surgery but is also influenced by psychological, sensory, and airflow-related factors. The findings emphasize the need for a multidisciplinary approach to understanding and managing ENS, considering both the physical and psychological aspects of the condition. The authors advocate for further research to clarify the pathophysiological mechanisms of ENS and improve diagnostic and therapeutic strategies for affected patients.