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Study of a Red Blood Cell Deformability Parameter in Patients With Sickle Cell Disease (Drepaforme)

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ClinicalTrials.gov Identifier: NCT03977532
Recruitment Status : Unknown
Verified June 2019 by Assistance Publique Hopitaux De Marseille.
Recruitment status was:  Recruiting
First Posted : June 6, 2019
Last Update Posted : June 6, 2019
Information provided by (Responsible Party):
Assistance Publique Hopitaux De Marseille

Brief Summary:

Sickle cell disease is the most common genetic disease in the world. It results in the synthesis of an abnormal hemoglobin (HbS) which, in its deoxygenated form, polymerizes and causes structural changes in red blood cells (RBCs). They become more rigid and less deformable. The fragility of sickle-cell RBCs leads to their massive destruction, leading to chronic anemia (i.e. low hemoglobin in the blood) and to low tissue oxygenation. More rigid and less deformable, sickle-shaped RBCs tend to obstruct microvessels, leading to particularly painful vaso-occlusive crisis (VOC), which can cause organ failure (spleen, kidneys, brain, lungs, heart, liver, bone ...) and patient's lifethreatning. A preliminary work on red blood cells of sickle cell patients showed alteration of a parameter measuring the overall deformability of RBCs by assessing the nature of their movement in a shear flow. This parameter is altered sickle cell patients at basal state compared to a population of healthy individuals. This alteration is increased when sickle cell patients are in crisis.

The main objective of this project is to study the evolution of this parameter in sickle cell patients according to their health status (basal state vs vaso-occlusive crisis). The investigators hypothesize that the alteration of the RBC deformability parameter is significant before symptoms of vaso-occlusive crisis (several hours to several days). The main objective is a weekly analysis of the evolution of the parameter in 30 sickle cell patients (SS or SB°) in the basal state and daily in at least 6 patients at the beginning, during and just after a vaso-occlusive crisis. The comparison between the parameter measured in a subject in the basal state and in the same subject in crisis will be performed. The criteria for the presence of a vaso-occlusive crisis were: the appearance of a attacks of pain affecting at least two territories +/- fever> 38.3 +/- dyspnea and / or sputum. The investigators will differentiate the moderate VOC managed at home with low-level analgesics and VOC requiring hospitalization. The number of days of hospitalization, the occurrence of thrombotic complications, the degree of anemia and hemolysis will be noted. The measurement of the parameter will be performed on a capillary sampling of 40 microliters performed at the fingertip, weekly outside crises and daily when a crisis occurs.

Condition or disease Intervention/treatment Phase
Sickle Cell Disease Other: Micro-blood sampling Not Applicable

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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 30 participants
Allocation: N/A
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Other
Official Title: Study of a Red Blood Cell Deformability Parameter in Patients With Sickle Cell Disease, at Basal State and During Vaso-occlusive Crisis
Actual Study Start Date : September 14, 2018
Estimated Primary Completion Date : September 14, 2020
Estimated Study Completion Date : September 14, 2021

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
Experimental: patients with sickle cell disease Other: Micro-blood sampling
capillary sampling of 40 microliters performed at the fingertip

Primary Outcome Measures :
  1. cytoplasmic viscosity measurement of red blood cells [ Time Frame: 6 months ]
    Determination of the cytoplasmic viscosity parameter variations by measuring percentage of tanktreading (nature of movement of cells in a shear flow) from a micro-blood sample

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Homozygous SS or SB° sickle cell patients
  • Person without regular blood transfusion

Exclusion Criteria:

  • Other general diseases
  • Psychiatric disorder
  • Alcoholics
  • Minors
  • Absence of informed consent
  • Pregnant or lactating woman
  • Person under guardianship
  • Person living in a health or social institution
  • Person in emergency
  • Person out of healthcare system
  • Person deprived of liberty
  • Person who has received a blood transfusion in the previous 3 months
  • Person with regular blood transfusion or in a blood transfusion program

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT03977532

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Contact: Emmanuelle Bernit, MD emmanuelle.bernit@ap-hm.fr

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Assistance Publique Hôpitaux de Marseille Recruiting
Marseille, France, 13005
Contact: Emmanuelle Bernit, MD       emmanuelle.bernit@ap-hm.fr   
Sponsors and Collaborators
Assistance Publique Hopitaux De Marseille
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Study Director: Emilie Garrido Pradalié Assistance Publique Hôpitaux de Marseille
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Responsible Party: Assistance Publique Hopitaux De Marseille
ClinicalTrials.gov Identifier: NCT03977532    
Other Study ID Numbers: 2018-36
First Posted: June 6, 2019    Key Record Dates
Last Update Posted: June 6, 2019
Last Verified: June 2019

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Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: No
Additional relevant MeSH terms:
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Anemia, Sickle Cell
Anemia, Hemolytic, Congenital
Anemia, Hemolytic
Hematologic Diseases
Genetic Diseases, Inborn