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Creatine kinase activity in sickle cell disease
Insights
Creatine kinase (CK) levels are normal in sickle cell disease patients during steady state. However, elevated CK activity indicates muscle damage during vaso-occlusive crises, especially with pain or chest syndrome.
Area of Science:
- Biochemistry
- Hematology
- Clinical Medicine
Background:
- Sickle cell disease (SCD) is a genetic blood disorder characterized by abnormal hemoglobin.
- Vaso-occlusive crises (VOC) are a hallmark of SCD, causing severe pain and potential organ damage.
- Muscle involvement and pain are common during SCD exacerbations.
Purpose of the Study:
- To investigate creatine kinase (CK) activity in patients with sickle cell disease.
- To determine if CK levels can serve as a biomarker for muscle injury during vaso-occlusive crises.
Main Methods:
- Creatine kinase activity was measured in patients with SCD in steady state.
- CK levels were assessed in patients admitted for vaso-occlusive crises, with and without muscle pain or chest syndrome.
- CK activity was correlated with clinical symptoms and pre-admission exercise.
Main Results:
- CK activity was comparable to healthy individuals in SCD patients in steady state.
- Elevated CK levels were observed in a subset of patients during vaso-occlusive crises, particularly those with muscle pain or chest syndrome.
- Significantly higher CK activity was found in all patients experiencing VOC with muscle pain, with extreme elevations in those who exercised prior to admission.
Conclusions:
- Creatine kinase activity is a potential indicator of muscle perturbation in sickle cell disease.
- Measuring CK may help identify muscle damage associated with sickling events during vaso-occlusive crises.
Abstract:
Creatine kinase activity was measured in 28 patients in the steady state of sickle cell disease and ranged from 4-45 IU/l, comparable with that found in healthy adult caucasians. Creatine kinase activity was also measured in 14 patients admitted consecutively for the treatment of vaso-occlusive sickle cell crises. Creatine kinase activity remained within the normal range in eight of these 14 patients throughout their admission; none had muscle pain or a chest syndrome. In the remaining six, three with muscle pain and three with a chest syndrome, increased activity was found on one or more days. A further 17 patients with vaso-occlusive sickle cell crises, associated with muscle pain, were studied. Creatine kinase activity was significantly raised in all 17, the mean creatine kinase activity for men was 578.8 IU/l and 210.6 IU/l for women, with the highest values (up to 1790 IU/l) found in those who had exercised before admission. Measurement of creatine kinase activity may therefore be a useful marker of muscle perturbation due to sickling.