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Home > "N" Clinical Trials Conditions > Natural History of West Nile Virus Infection  Natural History of West Nile Virus Infection
Natural History of West Nile Virus Infection
For Condition: Encephalitis,West Nile Virus,Myelitis
Status: Recruiting
Sponsor(s): Warren G Magnuson Clinical Center (CC) ,
Synopsis: This study will examine how West Nile virus (WNV) infection affects the body. Some people infected with WNV have no symptoms. In others, symptoms may vary from fever and headache to a polio-like syndrome with paralysis, to coma and brain changes like those of a stroke. Many patients recover with no lasting effects, while a few can have long-lasting neurological damage or may die. This study will collect clinical, laboratory, diagnostic, and radiographic information on people thought to have WNV to better understand the disease. Patients 18 years of age and older diagnosed with or suspected of having West Nile virus infection may be eligible for this study. Patients will be hospitalized until they are well enough to go home and will undergo the following tests and procedures: - Medical history and physical examination: A thorough history and physical examination will be done on the first day of the study. Then, brief physical exams, including measures of blood pressure, heart rate, breathing rate, and temperature, will be done during each day of hospitalization and at every follow-up clinic visit (at 2 weeks and at 1, 3, and 6 months). - Blood tests: Blood samples will be collected on the first day of the study, at day 7, at hospital discharge, and at follow-up visits to determine if virus remains in the blood and how it is affecting the body. - Magnetic resonance imaging (MRI): MRI scans will be done within 72 hours of beginning the study and 1 month after that. This test uses a strong magnetic field and radio waves to produce images of the brain that might show abnormalities in the brains of patients with WNV and reveal whether the abnormalities can predict how an individual will recover. For the procedure, the patient lies on a table that is moved into the narrow tunnel-like scanner. During the procedure, a contrast agent that brightens the images is injected through a catheter placed in an arm vein. - Neurological examination and neurological function tests: Participants will be tested to see if the West Nile virus has affected their thinking and ability to perform normal daily activities. These tests will be done at the start of the study, on days 3 and 7 (also days 2, 4, 5, and 6 if patients are still in the hospital), at discharge, and at follow-up visits. The tests involve answering a number of questions and performing simple tasks, such as squeezing a hand or lifting a foot. - Patients who develop weakness in their arms or legs will also have the following studies: a. Electromyography (EMG) to study the electrical activity of the muscle. For this test, needles are placed into a muscle to record the electrical activity at that site. b. Nerve conduction studies to measure how well the nerves are working. A small charge of electricity is delivered to a nerve in the affected limb, triggering a muscle to tighten or bend. Small wire electrodes are attached to the skin to measure the time is takes for the nerve to move the electrical current from one part of the limb to another. c. Spinal MRI to see if the virus is affecting the spinal cord. Results of other tests done by the patient's local doctor (such as lumbar puncture, electroencephalogram, x-rays, etc.) will be requested. If a lumbar puncture is done, a small amount of cerebrospinal fluid will be requested for testing for WNV.
Details: 'Investigation of the Natural History of West Nile Virus Infection in Patients with or at Risk for Progression to West Nile Virus Encephalitis and/or Myelitis' is a descriptive natural history study. Since arrival of West Nile virus in North America in 1999, the number of cases and the geographic range have expanded each year, a trend that is expected to continue for the near future. There is little sequentially collected clinical, radiologic and laboratory data. Standardized data collection tools to measure neurologic outcome have not been developed. Prospectively collected data on laboratory and clinical events associated with WNV encephalitis are needed to bridge the gap in current knowledge of this disease and to assist with the design of better treatments. The objectives of this study are to identify and describe the mortality and morbidity, specifically the neurologic and functional outcomes of patients infected with West Nile virus, to characterize their clinical course and diverse manifestations, and to assess kinetics of specific anti-West Nile antibodies following infection with West Nile virus, correlating them with outcomes. Eligible patients fall into 2 categories: those with encephalitis and/or myelitis, presumptively caused by WNV, and those with confirmed acute WNV infection who are at high risk for progression to neurologic illness due to age or immunosuppression. Only hospitalized patients will be enrolled. There will be study visits at Day 1; Days 2, 3, 4, 5, and 6 if hospitalized (if not hospitalized only seen on Day 3); and Days 7, 14, 30, 90, and 180. Evaluations will include serial neurologic exams, an MRI at baseline and at day 30, serology and PCR for WNV, and 4 functional and cognitive scores which have been validated in neurologic illness in adults: the Barthel Index (BI), the Modified Rankin Scale (MRS), the Glasgow Outcome Score (GOS) and the modified Mini-Mental Status Examination (3MS). The subset of patients who develop motor weakness of their extremities will have electromyograms, nerve conduction studies and spinal MRI performed. Results from selected clinically indicated tests (done by study participants' physicians, not mandated for the study) will be recorded in the Case Record Forms (CRFs).
Eligibility:
Study Type: Observational, Natural History
Minimum Age/Maximum Age: /
Genders: Both
Protocol Entry Criteria: INCLUSION CRITERIA: Hospitalized patients, regardless of race or gender, who consent and meet entry criteria will be enrolled. Eligible patients must fall into one of two categories: A. Hospitalized patients greater than or equal to 18 years of age with encephalitis and/or myelitis as defined below: New neurologic abnormality: Asymmetric extremity weakness without sensory abnormality; or Other neurologic abnormality (including altered level of consciousness) plus fever (subjective or objective) within the previous 4 days AND CSF examination within the previous 72 hours showing: Absence of organism on gram or fungal stain White blood cell count greater than or equal to 4 per mm(3) Ratio of CSF: plasma glucose of greater than or equal to 40% (CSF glucose/plasma glucose greater than or equal to 0.4) OR B. Hospitalized patients without encephalitis and/or myelitis who meet the following criteria: A positive IgM serology or PCR test for WNV in blood or cerebrospinal fluid, AND Clinical illness compatible with WNV infection as described by occurrence of greater than or equal to 3 of the following findings during the preceding less than or equal to 7 days: Diarrhea, headache, fever greater than 38 degrees Celsius, nausea and/or vomiting, myalgias and/or arthralgias, nuchal rigidity, macular or papular rash, new neurological abnormality AND A risk factor for the development of encephalitis as defined by: Age greater than or equal to 50 years, or Age greater than or equal to 18 years, plus immunosuppression, as defined by any one of the following: Hematologic malignancy, previous diagnosis of diabetes mellitus, chemotherapy within previous 4 weeks, stem cell transplant recipient or solid organ transplant recipient, taking immunosuppressive medications, including prednisone greater than or equal to 7.5 mg/day within the previous 4 weeks, history of human immunodeficiency virus (HIV) infection, congenital immunodeficiency syndrome (including common variable immunodeficiency) EXCLUSION CRITERIA: Unable to obtain valid informed consent Alternate explanation (as determined by the investigator) for clinical findings (such as structural brain lesions, cerebrovascular accident, or other infectious disease) Investigator's opinion that patient would be unable to adhere to protocol requirements
Total Enrollment: 110
Location and Contact Information:
Warren G. Magnuson Clinical Center (CC) *Recruiting*
Bethesda, Maryland, 20892
United States
Recruiting Patient and Public Liaison Office 1-800-411-1222
Additional Information:
Study ID Numbers: 030305; 03-CC-0305
Study Start Date: September 16, 2003
Record last reviewed: September 12, 2003
Additional information available at: clinicaltrials.gov
Clinicaltrials.gov Reference link: NCT00069303
Other West Nile Virus Studies:
1. Natural History of West Nile Virus Infection
2. Structure of the Herpes Simplex Virus Receptor
Related Studies:
Other West Nile Virus Clinical Trials
Other Maryland Clinical Trials
Other Bethesda Clinical Trials
Natural History of West Nile Virus Infection
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