Clinical Trials Logo

Clinical Trial Summary

This study will 1) identify characteristics of bone marrow mast cells in patients with unexplained anaphylaxis and flushing or with mastocytosis and 2) determine whether mastocytosis might be the underlying cause of unexplained anaphylaxis in some patients with this condition. Anaphylaxis is a hypersensitivity reaction in which patients may have flushing, hives, stuffy nose, red itchy eyes, difficulty breathing, swelling of the tongue, throat, palms and soles, abdominal cramping, lightheadedness, decreased blood pressure, and loss of consciousness. Although allergens are a common cause of anaphylactic episodes, no cause can be identified in up to 50 percent of patients who have recurrent events. Mastocytosis is a disease of excessive mast cells in tissues such as skin and bone marrow. These cells can release chemicals that result in itching, blisters, flushing, bone pain, and abdominal pain.

Patients 18 years of age and older who have episodes of anaphylaxis or flushing with no apparent cause or who have mastocytosis may be eligible for this study. Participants will have a medical history and physical examination; blood tests to identify genetic changes that are important in the growth, development, and functioning of human mast cells; and bone marrow aspiration and biopsy. For the bone marrow procedure, the skin over the hipbone and the outer surface of the bone itself are numbed with local anesthesia. Then, a special needle is inserted into the hipbone and about 1 tablespoon of bone marrow is drawn into a syringe. Another needle is inserted into the same area to collect a small piece of the bone marrow. Additional procedures may include allergen testing, urinalysis, and 24-hour urine collection.

Participants will return to NIH for reassessment of disease status in 12 to 18 months. The follow-up evaluation will include a history and physical examination, blood tests, possible repeat bone marrow and aspiration in patients whose clinical signs or symptoms change significantly, and other tests as clinically indicated.

First-degree relatives (parents, children, siblings) may be enrolled in limited instances to provide a blood sample for genetic analysis related to mast cell development and function for comparison with that of patients when they have similar symptoms.


Clinical Trial Description

Anaphylaxis is a severe systemic hypersensitivity reaction caused by release of mediators from mast cells and basophils. Signs and symptoms of anaphylaxis may include generalized flushing, hives, stuffy nose, red and itchy eyes, difficulty in breathing, swelling of the tongue, throat, palms and soles, gastrointestinal cramping, lightheadedness and loss of consciousness. Although most common causes of anaphylaxis include foods, drugs and stinging insects, a causative factor is not identified in up to 50% of the patients with recurrent anaphylactic episodes. Mast cells are important mediators of anaphylaxis. This study will examine the hypothesis that some patients with unexplained anaphylaxis may have systemic mastocytosis, a disorder of pathologic mast cell proliferation, as an underlying cause. In addition, it will investigate hematopoietic cells, which result in their tissue mast cells being more susceptible to degranulation. The study will enroll patients with mastocytosis with or without flushing or anaphylaxis, and patients with unexplained flushing or anaphylaxis. Patients will receive a clinical evaluation, blood tests and a bone marrow biopsy and aspirate. Research studies planned include flow cytometric analysis of blood and bone marrow cells, investigation of mutations or polymorphisms in genes involved in mast cell growth and differentiation, determination of surrogate disease markers and examination of mast cell growth and function. The study will improve the understanding of the mechanisms involved in anaphylactic reactions, which could in turn lead to development of strategies to better prevent or treat the episodes. ;


Study Design

N/A


Related Conditions & MeSH terms


NCT number NCT00047918
Study type Observational
Source National Institutes of Health Clinical Center (CC)
Contact
Status Completed
Phase N/A
Start date October 2002
Completion date August 2004

See also
  Status Clinical Trial Phase
Not yet recruiting NCT04475003 - Health Literacy Among Caregivers of Children With IgE-mediated Allergy With Risk of Anaphylaxis
Recruiting NCT04615065 - Acutelines: a Large Data-/Biobank of Acute and Emergency Medicine
Recruiting NCT06065137 - Standardised Drug Provocation Testing in Perioperative Hypersensitivity N/A
Active, not recruiting NCT03953482 - Evaluation of Medical Care and Patient's Knowledge About the Behavior to Take on Secondary Prevention of Anaphylaxis
Recruiting NCT05112367 - Epidemiology and Management of Pediatric Anaphylaxis and Allergy in the Pediatric Emergency Department of Montpellier
Completed NCT03366298 - Pharmacokinetics of Intramuscular Adrenaline in Food--Allergic Teenagers Phase 4
Completed NCT02958605 - Smartphone Apps for Pediatric Resuscitation N/A
Completed NCT04696822 - Bioavailability of Nasal Epinephrine Phase 1
Completed NCT03942692 - What is the Allergy Follow-up for Children After Anaphylactic Reaction? AFCAR : Allergy Follow-up for Children After Anaphylactic Reaction
Completed NCT02854969 - Satisfaction of Patient With Anaphylaxis in the Use of a Medical Device N/A
Completed NCT03282929 - Study to Explore the Pharmacokinetics and Pharmacodynamics of Epinephrine in Healthy Male and Female Subjects With Different Skin to Muscle Depth (STMD) Phase 1
Recruiting NCT01326741 - Clonal Mast Cell Disorders in Exercise-Induced Anaphylaxis N/A
Recruiting NCT06445374 - Effects of Inhaled Epinephrine on Systemic Allergic Reactions During Allergy Testing Immunotherapy or Oral Challenges Phase 1
Completed NCT01217138 - Make up for the Epinephrine Autoinjector Phase 4
Completed NCT02424136 - PEAnut Anaphylaxis Predictors N/A
Completed NCT01432522 - A Study for Absorption of Intranasal Epinephrine Compared to Conventional Intramuscular Epinephrine N/A
Completed NCT02028065 - A Study to Evaluate the Incidence of Hypersensitivity After Administration of Sugammadex in Healthy Participants (MK-8616-101) Phase 1
Active, not recruiting NCT01247415 - Clinical Investigation on Allergic-like Reactions and Oculo-respiratory Syndrome After the H1N1 Pandemic Vaccine N/A
Completed NCT00868842 - Desensitization of Human Mast Cells: Mechanisms and Potential Utility for Preventing Anaphylaxis N/A
Completed NCT04290507 - Epidemiology and Outcome of Anaphylactic Shocks Admitted to Intensive Care Unit