ArticleLaryngoscope investigative otolaryngology2025
Efficacy of Platelet Rich Plasma Versus Placebo for Improvement in Olfactory Function in Adults With Olfactory Dysfunction: A Systematic Review and Meta-Analysis.
Article in Laryngoscope investigative otolaryngology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
2 citing papers in PubMed.
- Conductive Mechanisms of Olfactory Dysfunction in Chronic Rhinosinusitis: A Focus on Nasal Airflow Dynamics and Olfactory Mucus.Clinical reviews in allergy & immunology · 2026Review
- Efficacy of Platelet Rich Plasma Versus Placebo for Improvement in Olfactory Function in Adults With Olfactory Dysfunction: A Systematic Review and Meta-Analysis.Laryngoscope investigative otolaryngology · 2025Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
5 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Background: Olfactory dysfunction significantly impairs quality of life. Conventional treatments such as corticosteroids and olfactory training offer limited and inconsistent efficacy. Platelet-rich plasma (PRP), a biologically active agent, has shown potential regenerative effects in olfactory neuroepithelium. This study systematically evaluates the efficacy of PRP compared to placebo in improving olfactory function. Methods: A systematic review and meta-analysis was conducted according to PRISMA guidelines and was registered in PROSPERO (CRD 420251045079). The databases searched included PubMed, Scopus, Embase, Central, and Web of Science. Seven studies (four RCTs, three non-RCTs) involving 789 patients were included. Subjective and objective outcomes were extracted and pooled using a random-effects model. Risk of bias was assessed using ROB-2 and ROBIN-I tools. Results: PRP was significantly more effective than placebo in improving subjective olfactory scores at 1 month (SMD = 1.16, 95% CI [0.29-2.03], Conclusion: PRP demonstrates both short- and long-term benefits in olfactory recovery compared to placebo, especially among younger adults. Given the promising results and safety profile, PRP represents a viable treatment option for olfactory dysfunction. Standardization of PRP protocols and further high-quality RCTs need to be further explored.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.