Effect of Cranberry Extract on Infections in Burn Patients

Methods

Design. The present study is a prospective, randomized, double-blind, placebo-controlled study of the effect of taking three times daily doses of cranberry extract in capsule form on the incidence of infection in burn patients.

Participants. Eighty patients suffering from burns and admitted to the Saint Elizabeth Regional Medical Center Burn Center, Lincoln, NE will take place in the proposed study.

Inclusion Criteria. Patients will be asked to participate in the study if the following criteria are met:

• Patients are admitted to the Saint Elizabeth Regional Medical Center Burn Unit.
• Age 19 and older.
• Patients have an expected hospital stay of 7 days or more.
• Patients are able to consume oral medication capsules.

Exclusion Criteria. Patients will not be asked to participate in the study if any of the following are present:

• Patients have a known infection.
• Patients are not able to consume oral medication capsules.
• Patients have any known allergies to cranberry or placebo components.
• Patients have known allergy to aspirin (cranberries may contain salicylic acid).
• Patients are pregnant or breast-feeding.
• Patients are taking warfarin
• Patients with known nephrolithiasis.
• Patients with renal impairment as evidenced by a creatinine clearance that is less than predicted by Cockroft-Gault formula.

A cranberry extract standardized by Ocean Spray Cranberries, Inc. will be placed into capsules in the Saint Elizabeth Regional Medical Center pharmacy. Each cranberry capsule will contain 500mg of cranberry extract. Placebo capsules will be made to look identical to cranberry capsules and will also be made at the Saint Elizabeth Regional Medical Center pharmacy. A staff pharmacist will separate the capsules into a cranberry extract group and a placebo group. A staff pharmacist will randomly assign patients to either the cranberry extract group or the placebo group. The patient, physicians, and research staff involved in data collection will be blinded to patient group assignment.

Procedure. After admission to the burn unit and after the physician has deemed that the patient is able to consume medication capsules orally, patients meeting all other selection criteria will be asked to participate in the study. Study rationale and procedures will be described to patients and informed consent will be obtained if patients indicate a willingness to participate. Basic demographic data, burn/wound related information and information pertaining to any other infections will be obtained. Participants will be randomly assigned to either the placebo or the cranberry group. Participants will be given one capsule as soon as possible after hospital admission (or as soon as they have been deemed capable of consuming medication capsules orally) and then as close as possible to 8 hours after the first dose. Patients will then be placed on an 8 hour dosing schedule (i.e., one capsule every 8 hours). Burn wounds will be examined for any clinical signs of infection as judged by attending physician on a daily basis. The determination as to whether an infection is present vs. absent will be made by a physician utilizing specific criteria. If signs of infection are present, cultures of the wound site will be taken and bacterial type will be recorded. After initial infection, wound sites will be observed to determine if infections resolve with treatment. If treatment does not seem to eradicate the infection, another bacterial culture will be taken and bacterial analysis will be performed and recorded. Data pertaining to wound infection and wound appearance will be taken on a daily basis throughout the duration of the patient's hospital stay. In addition, information pertaining to all infections present in each patient will be recorded on a daily basis throughout the patient's entire hospital stay. The determination as to whether other infections are present vs. absent will be made by a physician utilizing specific criteria.