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Heart Disease in Sickle Cell Anemia

Primary Purpose

Sickle Cell Anemia, Pulmonary Hypertension

Status
Completed
Phase
Locations
United States
Study Type
Observational
Intervention
Sponsored by
National Institutes of Health Clinical Center (CC)
About
Eligibility
Locations
Outcomes
Full info

About this trial

This is an observational trial for Sickle Cell Anemia focused on measuring Cardiac Arrhythmias, Diastolic Dysfunction, Pulmonary Hypertension, Sickle Cell Anemia, Sudden Death, Thalassemia

Eligibility Criteria

18 Years - 60 Years (Adult)All SexesDoes not accept healthy volunteers

INCLUSION CRITERIA FOR RIGHT HEART CATHETERIZATION AND STRESS ECHO: Either gender, aged greater than 18 years Diagnosis of sickle cell disease (electrophoretic documentation of SS, SC, or S Beta-thalassemia genotype is required) Hematocrit greater than 18 % (with an absolute reticulocyte count greater than 100,000/ml) EXCLUSION CRITERIA FOR RIGHT HEART CATHETERIZATION AND STRESS ECHO: Pregnancy or lactation Known or suspected coronary artery disease Hematocrit less than 18 %: will not be eligible for the study; may return for evaluation at a later date Significant renal insufficiency (patient on hemodialysis or estimated creatinine clearance less than 30% of normal Cerebrovascular accident within the last six weeks New diagnosis of pulmonary embolism within the last three months History of retinal detachment Patients with PAH known to be secondary to other causes, such as systemic lupus erythematosus, other collagen vascular diseases, valvular heart disease, congenital heart disease Poor echo windows Any other condition that would prevent participation in the study (for example HIV infection) INCLUSION CRITERIA FOR NON-INVASIVE PROCEDURES: Either gender, aged greater than 18 years Diagnosis of sickle cell disease (electrophoretic documentation of SS, SC, or S Beta-thalassemia genotype is required) EXCLUSION CRITERIA FOR NON-INVASIVE PROCEDURES: Pregnancy or lactation Known or suspected coronary artery disease Significant renal insufficiency (patient on hemodialysis or estimated creatinine clearance less than 30%of normal Cerebrovascular accident within the last six weeks New diagnosis of pulmonary embolism within the last three months History of retinal detachment Patients with PAH known to be secondary to other causes, such as systemic lupus erythematosus, other collagen vascular diseases, valvular heart disease, congenital heart disease Patients who are intolerant of MRI will not undergo cardiac MRI Any other condition that would prevent participation in the study (for example HIV infection)

Sites / Locations

  • Suburban Hospital
  • National Institutes of Health Clinical Center, 9000 Rockville Pike

Outcomes

Primary Outcome Measures

Secondary Outcome Measures

Full Information

First Posted
June 3, 2005
Last Updated
June 30, 2017
Sponsor
National Institutes of Health Clinical Center (CC)
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1. Study Identification

Unique Protocol Identification Number
NCT00113152
Brief Title
Heart Disease in Sickle Cell Anemia
Official Title
Are Left Ventricular Abnormalities Associated With Pulmonary Hypertension in Sickle Cell Anemia?
Study Type
Observational

2. Study Status

Record Verification Date
October 2, 2007
Overall Recruitment Status
Completed
Study Start Date
June 2, 2005 (undefined)
Primary Completion Date
undefined (undefined)
Study Completion Date
October 2, 2007 (undefined)

3. Sponsor/Collaborators

Name of the Sponsor
National Institutes of Health Clinical Center (CC)

4. Oversight

5. Study Description

Brief Summary
This study will explore what may cause people with sickle cell anemia to have heart problems and an increased risk of sudden death. People 18 years of age and older with sickle cell anemia may be eligible for this study. Candidates are screened with a medical history and physical examination, electrocardiogram (EKG), echocardiogram (heart ultrasound), and blood tests. Participants undergo the following tests and procedures: Holter monitoring: The patient wears a small, battery-operated device to record heart rate and rhythm over 24 to 48 hours. QRST surface mapping: An EKG using 64 electrodes is done at rest and during exercise to provide a detailed look at the heart and its conduction system. Chest x-rays are taken to examine the lungs. Bicycle exercise echocardiography test: Blood pressure, pulse, heart rhythm and oxygen use are monitored while the patient exercises on a stationary bicycle. Ultrasound pictures are also obtained during the exercise. Echocardiogram: A heart ultrasound is done to check how well the heart is pumping blood. Pulmonary artery catheterization: A catheter (plastic tube) is inserted into a vein and advanced to the chambers of the heart, through the heart valve and into the lung artery. The pressures in the heart and lung blood vessels are measured while the patient is resting and during exercise, with the bed tilted up and down, and after giving 500 mls of fluid into a vein. Blood tests are done to measure a hormone called brain natriuretic peptide, which can increase with the development of heart failure, and nitrite, a substance that can affect blood vessel dilation. Some blood is stored to test for inflammatory markers and for possible future gene and protein analysis. Cardiac magnetic resonance imaging (cMRI): The patient lies in a donut-shaped magnet while pictures of the heart are obtained using a magnetic field and radio waves. Earplugs are worn to muffle the loud sounds that occur with electrical switching of the magnetic fields. A contrast agent called gadolinium may be injected to enhance the quality of the images. Invasive electrocardiographic (reveal) monitoring: This procedure permits study of the heart rhythms over a long time period. A small device is placed just under the skin on the left side of the chest. It can be left in for up to 14 months to monitor the heartbeat continuously during this time.
Detailed Description
Sickle cell anemia is an inherited blood disorder primarily affecting groups with origins in endemic malarial areas, especially those of African descent. SCA results from one of two single amino-acid substitutions in beta-hemoglobin (Hb-S and Hb-C) that increases the propensity for hemoglobin to polymerize, thus distorting, sickling and hemolyzing red cells. Individuals homozygous for Hb-S (or double heterozygote Hb-S and Hb-C) develop sickle cell anemia (SCA), while heterozygotes have sickle cell trait. SCA is characterized by chronic anemia and crises of red cell sickling and ischemia that are often painful and affect several organs and tissue types. SCA confers considerable disability, morbidity and mortality. Annual mortality from SCA has been estimated at approximately 3%. As a significant number of these deaths are sudden, a cardiac cause has been suspected. However, no cardiac mechanism of sudden death (SD) has been clearly identified. Recently, it has been demonstrated that SCA patients with pulmonary hypertension (PAH) have a higher incidence of SD than those with normal pulmonary pressures. In many patients, PAH occurs in association with elevated pulmonary arterial wedge pressures and normal pulmonary arterial resistance, suggesting that the PAH develops as the result of left ventricular (LV) abnormalities. Furthermore, in other conditions in which PAH develops, SD occurs only at pressures considerably higher than those observed in SCA. These factors suggest that PAH in SCA is a surrogate marker for, rather than the cause of SD. Rather, an SCA cardiomyopathic process may provide a unifying mechanism that associates moderate degrees of PAH and high risk of SD from cardiac causes. We propose to describe the extent of cardiac involvement in SCA. Specifically, we will (1) describe the LV volume-pressure relations in SCA patients with and without pulmonary hypertension in order to determine how elevated pulmonary pressures are related to dynamic filling properties of the LV; and (2) determine whether cardiac arrhythmias are common in SCA patients with PAH and if they contribute to SD. Improved understanding of the etiology and mechanisms of SD in SCA may allow the development and testing of therapies for the primary prevention of SD.

6. Conditions and Keywords

Primary Disease or Condition Being Studied in the Trial, or the Focus of the Study
Sickle Cell Anemia, Pulmonary Hypertension
Keywords
Cardiac Arrhythmias, Diastolic Dysfunction, Pulmonary Hypertension, Sickle Cell Anemia, Sudden Death, Thalassemia

7. Study Design

Enrollment
120 (false)

10. Eligibility

Sex
All
Minimum Age & Unit of Time
18 Years
Maximum Age & Unit of Time
60 Years
Accepts Healthy Volunteers
No
Eligibility Criteria
INCLUSION CRITERIA FOR RIGHT HEART CATHETERIZATION AND STRESS ECHO: Either gender, aged greater than 18 years Diagnosis of sickle cell disease (electrophoretic documentation of SS, SC, or S Beta-thalassemia genotype is required) Hematocrit greater than 18 % (with an absolute reticulocyte count greater than 100,000/ml) EXCLUSION CRITERIA FOR RIGHT HEART CATHETERIZATION AND STRESS ECHO: Pregnancy or lactation Known or suspected coronary artery disease Hematocrit less than 18 %: will not be eligible for the study; may return for evaluation at a later date Significant renal insufficiency (patient on hemodialysis or estimated creatinine clearance less than 30% of normal Cerebrovascular accident within the last six weeks New diagnosis of pulmonary embolism within the last three months History of retinal detachment Patients with PAH known to be secondary to other causes, such as systemic lupus erythematosus, other collagen vascular diseases, valvular heart disease, congenital heart disease Poor echo windows Any other condition that would prevent participation in the study (for example HIV infection) INCLUSION CRITERIA FOR NON-INVASIVE PROCEDURES: Either gender, aged greater than 18 years Diagnosis of sickle cell disease (electrophoretic documentation of SS, SC, or S Beta-thalassemia genotype is required) EXCLUSION CRITERIA FOR NON-INVASIVE PROCEDURES: Pregnancy or lactation Known or suspected coronary artery disease Significant renal insufficiency (patient on hemodialysis or estimated creatinine clearance less than 30%of normal Cerebrovascular accident within the last six weeks New diagnosis of pulmonary embolism within the last three months History of retinal detachment Patients with PAH known to be secondary to other causes, such as systemic lupus erythematosus, other collagen vascular diseases, valvular heart disease, congenital heart disease Patients who are intolerant of MRI will not undergo cardiac MRI Any other condition that would prevent participation in the study (for example HIV infection)
Facility Information:
Facility Name
Suburban Hospital
City
Bethesda
State/Province
Maryland
ZIP/Postal Code
20814
Country
United States
Facility Name
National Institutes of Health Clinical Center, 9000 Rockville Pike
City
Bethesda
State/Province
Maryland
ZIP/Postal Code
20892
Country
United States

12. IPD Sharing Statement

Citations:
PubMed Identifier
7930871
Citation
Charache S. Sickle cells and sudden death. J Lab Clin Med. 1994 Oct;124(4):473-4. No abstract available.
Results Reference
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Heart Disease in Sickle Cell Anemia

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