Cerebrovascular Involvement in Sickle Cell Disease - Comprehensive Sickle Cell Center

Cerebrovascular Accident Clinical Trial

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT00005326
• Other study ID #: 4111
• Secondary ID: P60HL028381
• Status: Completed
• Phase: N/A
• First received: May 25, 2000
• Last updated: March 15, 2016
• Start date: January 1988
• Est. completion date: March 2004

Study information

• Verified date: December 2004
• Source: National Heart, Lung, and Blood Institute (NHLBI)
• Contact: n/a
• Is FDA regulated: No
• Health authority: United States: Federal Government
• Study type: Observational

Clinical Trial Summary

To continue studies on the two major neurological complications of sickle cell disease (SCD): namely, stroke and chronic encephalopathy.

Description:

BACKGROUND:

Stroke represents a focal brain insult whereas chronic encephalopathy represents a diffuse brain disturbance involving cognition and memory. The predisposition to stroke and the potential for dementia were increasingly apparent from our studies and the work of other investigators in sickle cell disease. The ontogeny of these two processes required further study before the mechanisms could be clearly articulated; and a coordinated assessment of cerebrovascular perfusion was needed to decipher the relationship between focal perfusion deficits and occlusion of large and small cerebral vessels. 150 subjects were enrolled in these studies. Improved understanding of the mechanisms underlying these two devastating neurological complications of SCD should result in prevention or effective treatment.

DESIGN NARRATIVE:

Three hypotheses were tested: (1) clinically-silent cranial magnetic resonance imaging (MRI) abnormalities represented the minimal expression of the neurovascular diathesis, and were the harbingers of clinically-overt strokes (study A); (2) sickle cell disease patients who developed cerebral infarctions had a predisposing risk factor(s) that contributed to this neurological complication (study B); and (3) sickle cell disease patients developed a chronic encephalopathy and dementia that was independent of the neurovascular diathesis (study C). Study A was a prospective evaluation of 50 SCD children aged 6 to 12 years attempting to identify a subgroup of patients at risk for the development of a clinically-apparent stroke. These patients were evaluated clinically, and underwent MRI scan, magnetic resonance angiography (MRA), and single photon emission computerized tomography (SPECT). Study B represented two studies designed to analyze risk factors for stroke. The first study was a retrospective case-control analysis of 25 young adults who suffered one or more strokes. These patients were age-matched to an SCD control group which had been clinically free of strokes and had MRI, MRA, and SPECT studies. The second study represented a prospective case-control analysis of children who were being followed in study A. Study C represented a prospective study of 50 SCD children, and 50 age-matched siblings or closest available relatives. Annual neurological examinations and neuropsychological evaluations were performed searching for evidence of chronic encephalopathy and dementia. The longitudinal study design was necessary to dissect out the subtle variables that contributed to the cognitive deficits. The study was renewed in FY 1998 to continue through FY 2004.

Note: Darryl DeVivo was PI on Subproject which began in FY 1988 as a competing renewal. The total grant began several years prior to that. Dollars for the subproject were estimated at 10% of the total funds awarded each year.

The study completion date listed in this record was obtained from the "End Date" entered in the Protocol Registration and Results System (PRS) record.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 0
• Est. completion date: March 2004
• Accepts healthy volunteers: No
• Gender: Male
• Age group: N/A to 100 Years
• Eligibility: No eligibility criteria

Study Design

N/A

Related Conditions & MeSH terms

• Anemia, Sickle Cell
• Blood Disease
• Cerebrovascular Accident
• Hematologic Diseases
• Stroke

Locations

Country	Name	City	State
n/a

Sponsors (1)

Lead Sponsor	Collaborator
National Heart, Lung, and Blood Institute (NHLBI)

References & Publications (4)

Brass LM, Prohovnik I, Pavlakis SG, DeVivo DC, Piomelli S, Mohr JP. Middle cerebral artery blood velocity and cerebral blood flow in sickle cell disease. Stroke. 1991 Jan;22(1):27-30. — View Citation

Hurlet-Jensen AM, Prohovnik I, Pavlakis SG, Piomelli S. Effects of total hemoglobin and hemoglobin S concentration on cerebral blood flow during transfusion therapy to prevent stroke in sickle cell disease. Stroke. 1994 Aug;25(8):1688-92. — View Citation

Kugler S, Anderson B, Cross D, Sharif Z, Sano M, Haggerty R, Prohovnik I, Hurlet-Jensen A, Hilal S, Mohr JP, et al. Abnormal cranial magnetic resonance imaging scans in sickle-cell disease. Neurological correlates and clinical implications. Arch Neurol. 1993 Jun;50(6):629-35. — View Citation

Venketasubramanian N, Prohovnik I, Hurlet A, Mohr JP, Piomelli S. Middle cerebral artery velocity changes during transfusion in sickle cell anemia. Stroke. 1994 Nov;25(11):2153-8. — View Citation