Study of Proteins Associated With Complex Regional Pain Syndrome

This study has been completed.
Sponsor:
Information provided by:
National Institutes of Health Clinical Center (CC)
ClinicalTrials.gov Identifier:
NCT00033969
First received: April 17, 2002
Last updated: March 14, 2014
Last verified: February 2012
  Purpose

This study will try to learn more about complex regional pain syndrome, or CRPS (previously known as reflex sympathetic dystrophy, spreading neuralgia, and sympathalgia), by examining the release of small proteins in the blood of patients with this condition. Patients with CRPS usually have three types of symptoms:

  • Sensory abnormalities increased sensitivity to pain or a painful reaction to a harmless stimulus
  • Perfusion abnormalities alterations in blood flow, temperature abnormality, swelling, decrease or increased nail growth, and hair and skin changes
  • Motor abnormalities weakness, guarding (Holding the limb in such a fashion that it minimizes accidental or intentional contact from possible sources of pain), and atrophy (wasting)

The cause of CRPS is unknown, and there are no definitive diagnostic tests for the condition. Because early treatment improves the prognosis of CRPS, a test that enables early diagnosis would be important for optimal medical management. The findings of this study may contribute to the development of such a test and possibly new drug treatments.

Normal healthy volunteers and patients of any age with complex regional pain syndrome who are in otherwise good general health may be eligible for this study.

Participants will have a medical history, physical examination and collection of a blood sample. They will fill out several questionnaires, providing information on their health, personality, mood, pain levels, and symptoms. Participation in the study requires one outpatient clinic visit.


Condition
Complex Regional Pain Syndromes
Healthy

Study Type: Observational
Official Title: Complex Regional Pain Syndrome Proteomics Study

Resource links provided by NLM:


Further study details as provided by National Institutes of Health Clinical Center (CC):

Enrollment: 120
Study Start Date: April 2002
Detailed Description:

The etiology of Complex Regional Pain Syndrome (CRPS) is unknown but a patient typically presents with a triad of clinical findings: sensory abnormalities, perfusion abnormalities and alterations in motor function. Since some of these findings are seen in the other disease states, the diagnosis is often not clear. A response to a sympathetic ganglion block (stellate or lumbar) is also suggestive of the disorder. However, there is no definitive diagnostic test for CRPS. Experience has shown that early aggressive treatment improves the prognosis. Therefore, tests that facilitate the early diagnosis would have important clinical implications.

Advances in laboratory techniques allow analysis of clinical samples to identify protein or patterns of protein changes associated with a disease state. Patients suffering with CRPS who are currently seen in a pain clinic will be asked to participate in this study. The subjects will complete a brief symptom survey, be examined by a co-investigator to document sensory, temperature and trophic changes, and have a blood sample collected for protein and gene expression (RNA) analysis. Blood samples from age-matched controls will be collected from non-CRPS patients. Fifty patient samples collected from each group will be analyzed and used to teach the diagnostic software and an additional 20 samples (10 controls, 10 CRPS patients) will be used to validate diagnostic accuracy.

  Eligibility

Ages Eligible for Study:   18 Years and older
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   Yes
Criteria
  • INCLUSION CRITERIA
  • Male or female patients referred by their physician with the diagnosis of CRPS criteria as outlined by Stanton-Hicks et al.

OR

  • Healthy volunteers will be screened according to the eligibility criteria as specified in the appendix (see Healthy Subject Eligibility).
  • Age restrictions: Patients and volunteers must be (Bullet)18 years of age at the time of enrollment. There is no upper limit for age of inclusion.
  • Good general health (other disease states could may confound the results see exclusion criteria)
  • Willing to have blood drawn
  • Willing to have behavioral measures
  • Willing to provide a directed medical history
  • There is expected to be a greater number of females than males being recruited to this study since there is a much higher occurrence of CRPS in women. Additionally, it is expected to be equal across all ethnic groups. However, we do not anticipate requiring any special recruiting strategies for specific gender or ethnic groups.

EXCLUSION CRITERIA

  • Contraindication to blood screening
  • Advanced disease other than the CRPS (cardiovascular, liver, kidney disease ASA III or above excluding CRPS) that may cause a theoretical inclusion of samples resulting in confounding results.
  • Pregnant and lactating women.

No exclusions will be made based on race, gender, or religion.

  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: NCT00033969

Locations
United States, Maryland
National Institutes of Health Clinical Center, 9000 Rockville Pike
Bethesda, Maryland, United States, 20892
Sponsors and Collaborators
Investigators
Principal Investigator: Andrew J Mannes, M.D. National Institutes of Health Clinical Center (CC)
  More Information

Additional Information:
Publications:
ClinicalTrials.gov Identifier: NCT00033969     History of Changes
Other Study ID Numbers: 020169, 02-NR-0169
Study First Received: April 17, 2002
Last Updated: March 14, 2014
Health Authority: United States: Federal Government

Keywords provided by National Institutes of Health Clinical Center (CC):
CRPS
RSD
Causalgia
Chronic Pain
Neuropathic Pain
Normal Control
Complex Regional Pain Syndrome
Healthy Volunteer
HV

Additional relevant MeSH terms:
Syndrome
Somatoform Disorders
Complex Regional Pain Syndromes
Disease
Pathologic Processes
Mental Disorders
Autonomic Nervous System Diseases
Nervous System Diseases
Peripheral Nervous System Diseases
Neuromuscular Diseases

ClinicalTrials.gov processed this record on September 18, 2014