Evaluation of Post Burn Rehabilitation Population for Itch Control

The mechanism of pruritus is poorly understood, but much stems from the inflammatory process during wound healing. Damaged nerve endings, substance P, mast cells releasing histamines, and presence of inflammatory prostaglandins can induce neuropathic and peripheral pruritoceptive itching. Absence of oil glands leading to dry skin and itching further aggravate the itching.

Swiss-American Products, Inc, has developed new non-prescription skin products containing a blend of endopeptidase enzymes in a moisturizer base to aid the body during recovery from injury and inflammation. In Stage II and III pressure ulcers, an amorphous hydrogel containing the enzymes was observed to help resolve inflammation and enhance healing. Anecdotal reports indicate a fast release cream with the enzymes, applied to insect stings and bites on intact skin resolved the itching and reduced, sometimes even preventing, edema. In a case study of chronic persistent contact dermatitis, one product was successfully used for immediate relief of pruritus and the slow release version was used for relief at night. Several centers have independently reported the resolution of pruritus associated with cellulitis in subjects with chronic wounds.

The hypothesis that itching can be reduced through the use of endopeptidase enzyme containing product in the post burn population will be tested. The use of the product has not been previously evaluated in burn subjects with pruritus. The primary objective of the preliminarily study would be to detect reduction of post burn itching through the use of the endopeptidase enzyme containing product.

Inclusion criteria

• Post burn subject must be experiencing pruritus as defined by
• at least three episodes of itch during the past week AND
• itching occurs at least twice during the episode day AND
• itching lasts for more than 5 minutes and is bothersome
• TBSA of burn is between 10 and 70%
• Currently performing rehabilitation at Villa Medica Rehabilitation Hospital
• Subject available for 4 weeks
• Test area has complete epithelialization
• Subject is willing to complete daily diary
• Subject is male or female and over 18 years of age

Exclusion criteria

• Subject will be excluded if pruritus is of nonburn etiology
• Subject requires topical steroids, topical antihistamines, or other topical medication and such medication cannot be discontinued
• Subject with known sensitivity to the enzyme papain or to the papaya fruit
• Subject requires immunosuppressives such as systemic steroid therapy, cancer chemotherapeutic agents
• Subject presently requires morphine for pain relief
• Subject is a known alcohol or drug abuser
• Subject is unable to communicate pain and itch scores or medication used