Mint Tea for the Treatment of Nasal Polyps

This study has been completed.
Sponsor:
Information provided by (Responsible Party):
Paul Keith, McMaster University
ClinicalTrials.gov Identifier:
NCT00465543
First received: April 23, 2007
Last updated: December 8, 2011
Last verified: December 2011
  Purpose

The purpose of this study is to evaluate the safety and efficacy of a new treatment for nasal polyps as compared to placebo (an inactive substance). The treatment involved is mint tea high in rosmarinic acid. Rosmarinic acid is a polyphenol, or a chemical substance found in certain plants such as oregano, rosemary, and the mints. It is the active ingredient in spearmint. The placebo used in this study will be mint tea low in rosmarininc acid. In this trial the amount of rosmarinic acid in the high rosmarinic acid tea, or study tea, will be 150mg. The placebo, or low rosmarinic acid tea, will contain 10mg of rosmarinic acid.


Condition Intervention Phase
Nasal Polyps
Other: Mint tea high in rosmarinic acid
Other: Mint tea low in rosmarinic acid
Phase 2

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Safety/Efficacy Study
Intervention Model: Crossover Assignment
Masking: Double Blind (Subject, Investigator)
Primary Purpose: Treatment
Official Title: A Double-blind,Placebo-controlled, Randomized, Crossover Trial of Mint Tea High in Rosmarinic Acid in Adults With Nasal Polyposis

Further study details as provided by McMaster University:

Primary Outcome Measures:
  • Nasal polyposis quality of life questionnaire [ Time Frame: Visits 2, 3,4,5 ] [ Designated as safety issue: No ]
  • Nasal patency as assessed by use of the Clement-Clarke peak nasal inspiratory flow meter (PNIF) [ Time Frame: Daily ] [ Designated as safety issue: No ]

Secondary Outcome Measures:
  • Nasal lavage eosinophils. [ Time Frame: Visits 1,2,3,4,5 ] [ Designated as safety issue: No ]
  • Peripheral blood eosinophils [ Time Frame: Visits 2,3,4,5 ] [ Designated as safety issue: No ]
  • Diary symptom scores. [ Time Frame: Daily ] [ Designated as safety issue: No ]
  • Nasal polyp size on visual inspection. [ Time Frame: Visits 1,2,3,4,5 ] [ Designated as safety issue: No ]
  • Subjects Global Assessment of symptoms [ Time Frame: Visits 3 and 5 ] [ Designated as safety issue: No ]

Enrollment: 22
Study Start Date: May 2007
Study Completion Date: June 2008
Primary Completion Date: June 2008 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Placebo Comparator: II
Arm 2 receives 4 weeks of placebo mint tea (consumed twice a day) followed by 4 weeks of washout and then a further 4 weeks of treatment with study mint tea (consumed twice a day).
Other: Mint tea low in rosmarinic acid
Mint tea low in rosmarininc acid contains 10mg of rosmarinic acid. To be consumed twice a day for 4 weeks. Brewed in 150ml of boiling water and allowed to steep for 10 minutes.
Placebo Comparator: I
Arm 1 receives 4 weeks of treatment with mint tea high in rosmarinic acid, consumed twice a day. Treatment is followed by a 4 week wash-out phase. Subjects then enter a 4 week phase of placebo mint tea (low in rosmarinic acid), to be consumed twice a day.
Other: Mint tea high in rosmarinic acid
Mint tea high in rosmarininc acid contains 150mg of rosmarinic acid. To be consumed twice a day for 4 weeks. Brewed in 150ml of boiling water and allowed to steep for 10 minutes.

Detailed Description:

Nasal polyps are clear, glistening, grape-like structures that occur in two percent of adults and contain a large number of activated eosinophils - about 20% of the constituents of nasal polyp tissue.

The standard treatment for nasal polyp patients is intranasal steroids which, in troublesome cases, may follow a short course of oral steroids. Surgery is reserved for extremely large polyps and those who fail medical treatment. However, many patients tire of using nasal sprays or are troubled by side effects such as nasal irritation or bleeding. So, while all treatments offer some benefit, there is no gold standard.

Rosmarinic acid is categorized as a polyphenolia phytochemical, or a 'plant phenol' and is found in a variety of plants including the herbs oregano and rosemary, as well as the mints. Peppermint is one of the most widely used single ingredient in herbal teas. It has been found in vitro to have significant antimicrobial and antiviral properties, strong antioxidant and antitumor actions, and some antiallergenic ability. Human based research is limited.

A mint tea high in rosmarinic acid has recently been produced. Anecdotal evidence suggests that it may be beneficial for allergic rhinitis if taken prior to allergen exposure (personal communication). Other anecdotal evidence found a blunting of the sputum eosinophils following allergen challenge in allergic asthmatics (personal communication). This trial aims to study the effects of this mint tea high in rosmarinic acid in adults with bilateral nasal polyps, a condition characterized by chronic eosinophilic inflammation. The control treatment will be a mint tea low in rosmarinic acid.

  Eligibility

Ages Eligible for Study:   18 Years and older
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   Yes
Criteria

Inclusion Criteria:

  1. Subjects who are male or female aged 18 years or older.
  2. Subjects who have signed an informed consent agreement.
  3. Subjects with a history of nasal polyp symptoms during the previous 12 months.

Exclusion Criteria:

  1. Subjects with severe nasal polyps requiring immediate surgery.
  2. Subjects presenting with unilateral polyps.
  3. Subjects who have undergone surgery to treat their nasal polyps (nasal polypectomy) within one year prior to visit one.
  4. Subjects who have a known fungal infection of the nose and/or paranasal sinuses, nasal candidiasis, acute or chronic infectious sinusitis of viral or bacterial nature.
  5. Subjects who have had an upper respiratory tract infection within two weeks prior to Visit one or any time between Visit 1 and Visit 2.
  6. Subjects having cystic fibrosis, Young's syndrome, primary ciliary dyskinesia, known HIV infection or alcohol abuse.
  7. Subjects with clinically significant, uncontrolled evidence of cardiovascular, neurological, hepatic, renal, respiratory, or any other medical condition that may interfere with the study.
  8. Subjects with a recent history (within six months) of a clinically significant psychiatric disorder other than mild depression.
  9. Subjects who have any clinically relevant deviation from normal in the general physical examination.
  10. Subjects who have received any depot, systemic or oral corticosteroid in the previous three months prior to the start of the study.
  11. Subjects who are unable to cease treatment with intranasal steroids four weeks prior to Visit one.
  12. Subjects with a known hypersensitivity to mint.
  13. Females who are pregnant or lactating or are likely to become pregnant during the study or are less than 8 weeks postpartum. Women of childbearing age may be included if in the opinion of the investigator, they are taking adequate contraceptive measures.
  14. Subjects who are unable to follow the instructions within this protocol or known inability to attend all clinic visits within the intervals stated.
  15. Subjects who have participated in a clinical trial involving an investigational or marketed drug within four weeks of visit one.
  16. Subjects who are allergy skin test positive to a seasonal allergen which will be present when performing the trial, that has caused, within the past 2 years, a clinically significant deterioration in nasal symptoms.
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT00465543

Sponsors and Collaborators
Hamilton Health Sciences Corporation
Investigators
Principal Investigator: Paul K. Keith Hamilton Health Sciences Corporation, McMaster Site
  More Information

Publications:
Keith PK, Conway M, Evans S, Edney P, Jennings B, Andersson B, Dolovich J. A double-blind comparison of intranasal budesonide dry powder vs placebo in nasal polyposis. J.Allergy Clin.Immunol. 1995;95:204(Abstract)
Keith PK, Conway M, Dolovich J. Development and validation of a nasal polyposis quality of life questionnaire. J Allergy Clin Immunol 1996;97:192(Abstract)
Keith PK, Ferrie P, Conway M, Waserman S, Schmuck ML, Denburg JA. A double-blind, placebo-controlled, randomized, crossover trial of montelukast in adults with nasal polyposis. Allergy Clin Immunol Int: J World Allergy Org, 2003; Supp 1:185.(Abstract)

Responsible Party: Paul Keith, Associate Professor, McMaster University
ClinicalTrials.gov Identifier: NCT00465543     History of Changes
Other Study ID Numbers: 07-010
Study First Received: April 23, 2007
Last Updated: December 8, 2011
Health Authority: Canada: Health Canada

Keywords provided by McMaster University:
Nasal polyposis
Mint tea
Double-blind
Placebo-controlled
Crossover

Additional relevant MeSH terms:
Nasal Polyps
Polyps
Nose Diseases
Respiratory Tract Diseases
Otorhinolaryngologic Diseases
Pathological Conditions, Anatomical
Rosmarinic acid
Antioxidants
Molecular Mechanisms of Pharmacological Action
Pharmacologic Actions
Protective Agents
Physiological Effects of Drugs
Platelet Aggregation Inhibitors
Hematologic Agents
Therapeutic Uses
Serine Proteinase Inhibitors
Protease Inhibitors
Enzyme Inhibitors
Anti-Inflammatory Agents, Non-Steroidal
Analgesics, Non-Narcotic
Analgesics
Sensory System Agents
Peripheral Nervous System Agents
Anti-Inflammatory Agents
Antirheumatic Agents
Central Nervous System Agents

ClinicalTrials.gov processed this record on July 26, 2014