The Impact of Bone Pain Crises on Platelet Parameters in Sample of Iraqi Sickle Cell Anemia Patients

Abstract

BACKGROUND: Volume indices and count of platelets through sickle cell anemia (SCA) steady state are modified by chronic hemolysis, red blood cell sickling, and vaso-occlusion induced by this structural hemoglobinopathy. The bone pain crises additionally change these parameters. The recognition of the modification in platelet indices has a significant impact on understanding the pathogenesis and outcome of sickle cell disease patients. OBJECTIVES: This study objective is to compare volume indices and count of platelets of SCA patients in steady and through bone pain crisis states. PATIENTS AND METHODS: This is a retrospective cohort study that included 82 SCA patients who received care between October 2022 and October 2023 at the Hereditary Blood Disease Center, Basra, Iraq Written consent was obtained from all the participants and legal guardians. The criteria of inclusion involved SCA patients of 13 years old and older who presented to the center at the period of the stdy. They had their platelet count and volume indices measured during the crises of bone pain and in the steady state later on. Platelet count, platelet distribution width (PDW), plateletcrit (PCT), mean platelet volume (MPV), and platelet-large cell ratio (P-LCR) were measured by the automatic analyzer. RESULTS: Through bone pain crises as well as steady state, patients had a normal mean platelet count in comparison to the reference values of non-SCA population. It was found that MPV, PDW, PCT, and P-LCR were different in a significant way between the steady and bone pain crisis states, with P ≤ 0.001 with the mean values of 9.69 ± 1.25 versus 11.09 ± 0.99 for MPV, 13.27 ± 0.46 versus 15.78 ± 0.65 for PDW, 0.31 ± 0.03 versus 0.36 ± 0.01 for PCT, and 0.16 ± 0.01 versus 0.18 ± 0 for P-LCR, respectively. CONCLUSIONS: Through the steady state as well as bone pain crisis, the platelet count of SCA patients showed a normal value according to the range of reference for the normal population with no SCA. The P-LCR, MPV, PCT, and PDW were different significantly between SCA two clinical states as they became higher through the state of bone pain crises. This finding reflects the increment in the activation of platelets and the existence of large platelets in circulation at the time of vaso-occlusive crises.