Clinical Trials Logo

Clinical Trial Summary

To establish a link among Chlamydia infection, sickle cell anemia, and stroke risk.


Clinical Trial Description

BACKGROUND:

Infection with Chlamydia pneumoniae (C. pneumoniae) is associated with an increased risk of cerebrovascular disease in the general population. Children with sickle cell anemia (SCA) are 200 times more likely to have cerebrovascular disease than normal children and are known to have an altered immune response to many infectious pathogens. C. pneumoniae is the leading infectious cause of acute chest syndrome which, interestingly, is a well- established risk factor for stroke in children with SCA. Preliminary data indicates that SCA patients with magnetic resonance imaging (MRI)-documented cerebral infarction are 12 times more likely to have C. pneumoniae infection than SCA patients with normal MRI scans. The investigators hypothesize that SCA patients have an abnormal immune response to C. pneumoniae that results in persistent infection which, in turn, triggers the development of cerebrovascular disease. Sickle cell anemia patients with an elevated velocity on transcranial doppler ultrasound (TCD) are known to be at high risk to develop stroke and an elevated TCD likely reflects underlying vascular disease. In addition, the Stroke Prevention in Sickle Cell Anemia Trial (STOP) demonstrated that almost 40 percent of children with an elevated TCD have evidence of cerebral infarction on MRI. Children with abnormal TCDs are, therefore, an appropriate population to investigate an association between cerebrovascular disease and C. pneumoniae infection.

The study is in response to an initiative on Ancillary Studies in Heart, Lung, and Blood Disease Trials released in June, 2000.

DESIGN NARRATIVE:

The study is ancillary to the STOP II clinical trial. The intent is: 1) To determine if C. pneumoniae infection is associated with cerebral infarction in children with SCA; 2) To characterize the immunological response to C. pneumoniae infection in patients with SCA. Establishing a link between C.pneumoniae infection and cerebral infarction will open the door to novel, less toxic approaches to the treatment and prevention of stroke in SCA, including antibiotics and vaccines. ;


Study Design

Time Perspective: Retrospective


Related Conditions & MeSH terms


NCT number NCT00037388
Study type Observational
Source National Heart, Lung, and Blood Institute (NHLBI)
Contact
Status Completed
Phase N/A
Start date July 2004
Completion date June 2006

See also
  Status Clinical Trial Phase
Completed NCT05477238 - Oxygen Consumption in Post-stroke Patients During Various Walking Activities Compared to Healthy Controls N/A
Completed NCT00046293 - ReoPro and Retavase to Treat Acute Stroke Phase 2
Completed NCT04584645 - A Digital Flu Intervention for People With Cardiovascular Conditions N/A
Completed NCT01116544 - Treatment of Chronic Stroke With AMES + EMG Biofeedback N/A
Withdrawn NCT04991038 - Clinical Investigation to Compare Safety and Efficacy of DAISE and Stent Retrievers for Thrombectomy In Acute Ischemic Stroke Patients N/A
Active, not recruiting NCT02563886 - Electrically Assisted Movement Therapy N/A
Recruiting NCT02446730 - Efficacy and Safety of BiomatrixTM Stent and 5mg-Maintenance Dose of Prasugrel in Patients With Acute Coronary Syndrome Phase 4
Completed NCT02141932 - Pocket-size Cardiovascular Ultrasound in Stroke N/A
Completed NCT01915368 - Determining Optimal Post-Stroke Exercise (DOSE) N/A
Recruiting NCT01769326 - Influence of Timing on Motor Learning N/A
Recruiting NCT02557737 - Botulinim Toxin Type A Injections by Different Guidance in Stroke Patients With Spasticity on Upper Extremities Phase 3
Terminated NCT01705353 - The Role of HMGB-1 in Chronic Stroke N/A
Completed NCT01423201 - Transient Ischemic Attack (TIA) Triage and Evaluation of Stroke Risk
Completed NCT01656876 - The Effects of Mirror Therapy on Upper Extremity in Stroke Patients N/A
Completed NCT01182818 - Fabry and Stroke Epidemiological Protocol (FASEP): Risk Factors In Ischemic Stroke Patients With Fabry Disease N/A
Withdrawn NCT00573092 - Analyzing Gene Regions That May Interact With the Effectiveness of High Blood Pressure Drugs N/A
Completed NCT00542256 - tDCS and Physical Therapy in Stroke N/A
Completed NCT00377689 - Evaluation of an Intervention Program Targeted at Improving Balance and Functional Skills After Stroke Phase 2
Recruiting NCT00166751 - Sonographic Assessment of Laryngeal Elevation N/A
Completed NCT00125619 - Internally Versus Externally Guided Body Weight-Supported Treadmill Training (BWSTT) for Locomotor Recovery Post-stroke N/A