"Platelet Rich Plasma for the Management of Post-Viral Olfactory Dysfunction.

Olfactory Disorder Clinical Trial

Official title:

"Platelet Rich Plasma for the Management of Post-Viral Olfactory Dysfunction.

Clinical Trial Details — Status: Enrolling by invitation

Administrative data

• NCT number: NCT05666492
• Other study ID #: 22D.470
• Status: Enrolling by invitation
• Phase: N/A
• Start date: August 17, 2022
• Est. completion date: August 17, 2024

Study information

• Verified date: December 2022
• Source: Thomas Jefferson University
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

SARS COV-19 has resulted in prolonged olfactory dysfunction in many patients. The investigators aim to compare the effect of topical platelet-rich plasma (test) vs saline (placebo) in patients with covid-related post-viral olfactory dysfunction.

Description:

The investigators hypothesize that the use of topical PRP will improve smell identification, threshold, and smell-related quality of life in comparison to a placebo.

This study will provide critical information for a promising new treatment of olfactory dysfunction with the highest level of evidence, in a randomized, placebo-controlled trial. Preliminary results from an ongoing pilot study investigating topical PRP is the basis for the hypothesis.

By investigating the efficacy of topical PRP in smell restoration, the investigators will provide a less-invasive way to deliver this autologous product. A randomized trial will set a precedent for the use of this treatment to serve a growing population of patients affected with post-COVID olfactory dysfunction. Over a period of one year, participants with post-viral olfactory dysfunction will be randomly assigned to a test or control group and will visit the clinic monthly for three months to receive PRP or saline based on their randomized group. This will be followed by 9 months of at-home electronic visits. At each visit both the test and control groups will undergo smell testing and will fill quality of life questionnaire.

Recruitment information / eligibility

• Status: Enrolling by invitation
• Enrollment: 120
• Est. completion date: August 17, 2024
• Est. primary completion date: August 17, 2024
• Accepts healthy volunteers: No
• Gender: All
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

• Adult patients suffering from either post-viral or post-COVID smell loss of any duration, without a history of nasal surgery, nasal polyposis, chronic rhinosinusitis, or intranasal tumors

• Patients who are post-COVID must report at least a positive home test on history

• Patients with post-viral etiology must have recall of a viral illness that immediately preceded smell loss

Exclusion Criteria:

• History of olfactory dysfunction predating COVID-19 infection

• History of trauma, previous surgery, or obstructive cause of OD (nasal polyps, chronic rhinosinusitis)

• Pregnancy

• Patients who are unable to provide consent

• Patients with known bleeding disorders

• Patients with known malignancies

Related Conditions & MeSH terms

• Disease
• Olfaction Disorders
• Olfactory Disorder

Intervention

Other:
• Platelet rich plasma
Platelet-rich plasma will be placed on the olfactory epithelium topically.
• Saline
Saline will be placed on the olfactory epithelium topically.

Locations

Country	Name	City	State
United States	Thomas Jefferson University Hospital	Philadelphia	Pennsylvania

Sponsors (2)

Lead Sponsor	Collaborator
Thomas Jefferson University	Monell Chemical Senses Center

Country where clinical trial is conducted

United States, 

References & Publications (4)

Mattos JL, Edwards C, Schlosser RJ, Hyer M, Mace JC, Smith TL, Soler ZM. A brief version of the questionnaire of olfactory disorders in patients with chronic rhinosinusitis. Int Forum Allergy Rhinol. 2019 Oct;9(10):1144-1150. doi: 10.1002/alr.22392. Epub 2019 Aug 20. — View Citation

Mavrogeni P, Kanakopoulos A, Maihoub S, Krasznai M, Szirmai A. Anosmia treatment by platelet rich plasma injection. Int Tinnitus J. 2017 Apr 19;20(2):102-105. doi: 10.5935/0946-5448.20160019. — View Citation

Yan CH, Mundy DC, Patel ZM. The use of platelet-rich plasma in treatment of olfactory dysfunction: A pilot study. Laryngoscope Investig Otolaryngol. 2020 Feb 21;5(2):187-193. doi: 10.1002/lio2.357. eCollection 2020 Apr. — View Citation

Yasak AG, Yigit O, Araz Server E, Durna Dastan S, Gul M. The effectiveness of platelet-rich plasma in an anosmia-induced mice model. Laryngoscope. 2018 May;128(5):E157-E162. doi: 10.1002/lary.27029. Epub 2017 Dec 15. — View Citation

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Effect of PRP on smell identification	Investigate the effect of topical PRP on olfaction via smell identification testing using a brief smell identification test (B-SIT). The change in smell identification with PRP or placebo over time will be assessed using B-SIT, a validated 12-odorant scratch-and-sniff questionnaire. The maximum possible score is 12, and the minimum score is 0. A score greater than or equal to 8 is considered normal olfaction, while a score lesser than three should raise a suspicion of malingering. Hence a higher score implies better outcomes.	Every month for 12 months
Primary	Effect of PRP on smell intensity	Investigate the effect of topical PRP on olfaction via smell identification testing using SCENTinel smell test.; The SCENTinel test assesses for odor identification and the threshold of identification. Every month the participant is provided with one SCENTinel card - a QR-coded Lift'n'smell card containing a single target odorant and two blank odorants. The QR code leads to an electronic questionnaire the subject must fill out. Results with less than 40% Odor threshold are considered olfactory dysfunction. Hence a higher score implies better outcomes. The change in participants' threshold of identification will be assessed monthly over a year.	Every month for 12 months
Primary	Effect of PRP on smell related quality of life	Investigate and compare the effect of topical PRP vs saline on quality of life participants using the Questionnaire of olfactory disorders negative statements only (QODNS) scale.; QODNS scale has 17 questions with each question scored between 0 to 3. The maximum score is 51 and the minimum score is 0 with higher scores being inversely related to the quality of life ie a higher score implies worse quality of life. The change in quality of life will be assessed monthly over one year.	Every month for 12 months
Secondary	Natural course of covid related olfactory dysfunction	Investigate the natural course of post-COVID / post-viral olfactory dysfunction in patients treated with placebo for the study by comparing the smell test.	12 months from clinic visit