Olfactory Training in Chronic Rhinosinusitis
|The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.|
|ClinicalTrials.gov Identifier: NCT03055572|
Recruitment Status : Withdrawn (Staffing issues resulted in the closure of the study prior to any participants being enrolled.)
First Posted : February 16, 2017
Last Update Posted : May 30, 2019
|Condition or disease||Intervention/treatment||Phase|
|Olfactory Dysfunction||Other: Olfactory Training with Essential Oils Other: Olfactory Training with Pure Fragrance Oils||Not Applicable|
Problems with the ability to smell are referred to as olfactory dysfunction (OD). This condition is a widespread issue. 10-20% of all adults have OD, with 15 million individuals in the US self-reporting it in the past year. Chronic rhinosinusitis (CRS) is defined as 12 weeks or longer of non-clear nasal drainage, nasal congestion, facial pain or pressure, and/or decreased sense of smell. CRS is a common cause of OD. Up to 78% of patients with CRS reporting decreased sense of smell.
Several previous studies have shown a beneficial treatment option for OD called olfactory training (OT). OT consists of smelling different odors several times per day, every day for several months. These studies have shown that OT improves the sense of smell in patients who lost their sense of smell due to acute infection, head trauma, or diseases of the brain like Parkinson's disease. OT has not, however, been studied previously as a treatment for OD due to CRS.
The proposed study will use a randomized controlled trial to investigate if OT is effective for the treatment of OD in CRS. It will also investigate if widely available and lower cost odors, called essential oils, are as effective as traditionally used, pure fragrance oils, for OT in CRS. Lastly, the modified Questionnaire of Olfactory Disorders (mQOD) will be tested to determine if it can be used as a valid measure for monitoring patient's response to treatment.
Patients diagnosed with CRS who report that their sense of smell is diminished on a standard intake survey given to all patients will be recruited for the study by their treating practitioner. Once enrolled and consented, the subject will take the mQOD and then undergo a baseline Brief Smell Identification Test (BSIT) test. They will then be randomly assigned to one of three groups. The subjects in two groups (n = 50 subjects per group) will receive OT while the subjects in the third group (n = 50 subjects) will serve as a control group and will not receive OT. Subjects in the OT groups will be asked to smell four different odors in rotation for five minutes two times per day, a total of 10 minutes of participation per day. Half of the patients assigned to the OT group will be given odors made of fragrance oils. The other half will be given odors made of essential oils to use. Patients will be blinded to whether they were given fragrance oils or essential oils. Subjects in the OT groups will be asked to record each training session in a provided journal.
All subjects regardless of group will be sent an electronic version of the mQOD via email after the first and second month. Regardless of which group subjects are assigned, they will continue taking all medications and treatments for CRS as if they were not enrolled in this study. After three months, all subjects will again complete this survey as well as a second BSIT test. This study will determine if a) OT is an effective treatment for OD due to CRS, b) essential oils are as effective as pure fragrance oils for OT in CRS, and c) if the mQOD can be used to monitor treatments for OD in CRS.
|Study Type :||Interventional (Clinical Trial)|
|Actual Enrollment :||0 participants|
|Intervention Model:||Parallel Assignment|
|Intervention Model Description:||Participants are randomized into one of three study arms: essential oil arm, pure fragrance oil arm, and control arm.|
|Masking Description:||Participants assigned to the either of the olfactory training arms will not know if they are in the essential oil arm or the pure fragrance oil arm.|
|Official Title:||Olfactory Training for Olfactory Dysfunction in Chronic Rhinosinusitis|
|Estimated Study Start Date :||March 1, 2019|
|Estimated Primary Completion Date :||December 15, 2019|
|Estimated Study Completion Date :||December 15, 2019|
Experimental: Olfactory Training with Essential Oils
Participants assigned to this group will do olfactory training using essential oils, while continuing the medical therapy prescribed by their provider.
Other: Olfactory Training with Essential Oils
Participants will be instructed to sniff one of four provided odors for approximately 10 seconds followed by a 10 second break before repeating with each successive odor for a total of 5 minutes. Essential oils will be used for the odors. The intervention will be completed in the morning before breakfast and in the evening before bed. Participants will document compliance by completing a log of olfactory training sessions.
Active Comparator: Olfactory Training with Pure Fragrance Oils
Participants assigned to this group will do olfactory training using pure fragrance oils, while continuing the medical therapy prescribed by their provider.
Other: Olfactory Training with Pure Fragrance Oils
Participants will be instructed to sniff one of four provided odors for approximately 10 seconds followed by a 10 second break before repeating with each successive odor for a total of 5 minutes. Pure fragrance oils will be used for the odors. The intervention will be completed in the morning before breakfast and in the evening before bed. Participants will document compliance by completing a log of olfactory training sessions.
No Intervention: Control Group
The control group will continue the medical therapy prescribed by their provider.
- Changes in Brief Smell Identification Test (BSIT) [ Time Frame: Baseline, Week 12 ]The Brief Smell Identification Test (BSIT) is a 12-question scratch-n-sniff test to evaluate sense of smell. Score ranges from 0 to 12. Higher BSIT score indicate a better sense of smell. BSIT scores ≥ 9 is considered normal. Lower BSIT scores (≤ 8) indicate olfactory dysfunction. A change in BSIT by 1 is considered clinically significant.
- Changes in modified Questionnaire of Olfactory Disorders (mQOD) score [ Time Frame: Baseline, Week 4, Week 8, and Week 12 ]The modified Questionnaire of Olfactory Disorders (mQOD) is a 17-item survey assessing quality of life in individuals with olfactory disorder. Respondents rate how much they agree with statements about how much their daily lives, social encounters, and feelings of safety are impacted by loss of smell by selecting "I agree" , "I agree partly", "I disagree partly" or "I disagree".
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT03055572
|Principal Investigator:||Thomas Edwards, MD||Emory University|