Empty nose syndrome (ENS) refers to the crusting, dryness and paradoxical nasal obstruction that some patients suffer following sinonasal, particularly turbinate, surgery. Although the prevalence of ENS is unknown, it is rare and indeed not everybody that undergoes turbinate resection will suffer from ENS symptoms. The condition has also been described in patients that have normal turbinate volume. These details, combined with a lack of an objective method for diagnosis make ENS a difficult condition to identify and manage.
Endoscopic endonasal approaches to anterior skull base tumours have evolved in recent years and there is now literature supporting its use compared to traditional approaches in terms of gross tumour resection and complication rates (1,2). Approaches to the anterior skull base are tailored to the individual case but commonly include complete middle and/or inferior turbinate resection, septectomy as well as ethmoidectomy and sphenoidotomy. Mucosal flaps are also commonly used to cover defects. The aim of these oncological procedures is to remove all remnants of tumour, and the turbinates, if not involved, often need to be resected for access.
Quality of life (QOL) tools attempt to quantify a patients’ personal assessment of their health status. The Sino-Nasal Outcome Test (SNOT-20) is a validated 20-item QOL survey that requires participants to rate sinonasal related symptoms such as sneezing, discharge and facial pain (3). In order to tailor this assessment for patients suffering ENS, Houser et al. (4) added an additional five domains to create the SNOT-25. This survey better evaluates the specific symptoms these patients suffer. These additional domains include dryness, difficulty nasal breathing, suffocation, nose too open and nasal crusting.
In this study we aim to assess whether patients undergoing resection for anterior skull base tumours develop ENS. As part of their oncological procedure these patients are often left with a true ‘empty nose’ with not only loss of turbinate volume and ethmoid/sphenoidotomy but also significant loss of nasal mucosa. An example of this is demonstrated in Figure 1
Patients from the tertiary practice of a single surgeon that had undergone anterior skull base or craniofacial resection for tumours between January 2009 and December 2014 were identified. The available patients were administered the SNOT-25 questionnaire by phone. The SNOT-25 can found at Houser et al. (4). Informed verbal consent was obtained for all patients. Additional information that was collected included patient demographics, treatment modalities and tumour characteristics.
A total of 34 patients were identified and of these 17 were contactable and amenable to completing the SNOT-25 questionnaire. Of the 17, 13 were male, the average age was 52 years and the median follow up time was 32 months (summarised in Table 1). There was a variety of pathologies, with the most common being adenocarcinoma (summarised in Table 2). The extent of the surgical resection for each patient is summarised in Table 3. Also included in this table are the details of whether septal, pericranial, turbinate or combinations of these were used as flaps to cover defects. Of the included patients, 9 of them received adjuvant radiotherapy prior to undertaking the survey.
The mean SNOT-20 score was 15.6/100 with the mean of the 5 ENS specific domains being 2.2/20 (Table 4). None of the patients described suffering the classic ENS symptoms. The most common ENS symptom identified by patients was nasal crusting with 5 of the patients scoring it as moderate or worse.
ENS is a rare, nebulous condition that presents in patients following sinonasal/turbinate surgery. Its pathophysiology is not well understood but is thought to be due to a combination of reduction in turbinate volume, alterations in air flow and neural damage (8). There is evidence that reducing the surface area within the nasal cavity impairs mucosal cooling, which is required for the sensation of nasal patency (9).
It has been demonstrated that anterior skull base surgery does not have an effect on subjective sinonasal function (10) and that although sinonasal surgery alters nasal anatomy this does not correlate with a change in function (11). In their systematic review, Choby et al. (12) concluded that in the appropriately selected patients, middle turbinate resection did not have a detrimental outcome.
The patients included in this study have had large resections. None of them had postoperative symptoms consistent with ENS. The main complaint was crusting, of which 5 patients suffered. Of these 5, 2 had radiotherapy as well which can contribute to crusting. Overall it does not appear that radiotherapy had a significant impact on the sinonasal function of the patients in this study.
The lack of ENS symptoms in patients that undergo anterior skull base resections suggests that anatomic alterations alone cannot explain why some patients suffer the sensation of obstruction after surgery. It is important to note that these patients are undergoing operations for oncological reasons not necessarily for sinonasal symptoms. It is possible that some patients that complain of obstruction already have underlying neural/psychological issues and when this subgroup undergo surgery, their persisting symptoms are then attributed to the operation.
There are a number of studies that have demonstrated that surgical interventions, mostly implants to replace turbinate bulk, have improved ENS symptoms (15,16) with there also being reports of improvement in SNOT-25 scores (7). In his systematic review of surgical interventions, Leong (17) concluded that although surgery appears to have benefit for some patients, there are some patients that have no or minimal improvement. Although only a case report, Lemogne et al. (18) reported treating a patient with ENS as a somatic symptom disorder with management consisting of cognitive behaviour therapy and psychotropic medication with significant improvement in the patients’ QOL, highlighting a potential psychological component to ENS.
Given that anatomical variation, in the form of turbinate reduction, is a core part of ENS it is a logical assumption that patients undergoing massive oncological sinonasal and anterior skull base resection would as a consequence be more likely to develop the condition. In assessing sinonasal function following anterior skull base surgery we have demonstrated that this is not the case and in doing so support the notion that turbinate reduction alone does not account for ENS.
Limitations of our study include not having preoperative SNOT-25 scores to compare to, or serial scores at set intervals post operatively (i.e., before and after adjuvant radiotherapy treatment). Bias could be reduced by the patients completing the surveys independently rather than answering questions over the phone.
In this study we administered the SNOT-25 questionnaire and were able to demonstrate that patients undergoing significant sinonasal resection in approaching anterior skull base lesions do not subsequently develop ENS. This confirms that anatomic alterations cannot completely explain ENS.
We would like to thank the patients that gave their time to participate in our study. Also we would like to acknowledge the administrative assistance provided by Teneille Certoma.
Conflicts of Interest: The authors have no conflicts of interest to declare.
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Cite this article as: Hardman J, Ahn J, Nirmalananda A. Assessing symptoms of empty nose syndrome in patients following sinonasal and anterior skull base resection. Aust J Otolaryngol 2018;1:9.