Creatine phosphokinase in long-term dialysis patients

Area of Science:

• Nephrology
• Biochemistry
• Endocrinology

Background:

• Patients undergoing regular dialysis often exhibit elevated creatine phosphokinase (CPK) levels.
• The specific isoenzymes and contributing factors to elevated CPK in uremia require further elucidation.

Purpose of the Study:

• To investigate the prevalence and potential causes of elevated creatine phosphokinase (CPK) levels in patients on regular dialysis.
• To determine the correlation between CPK levels and various clinical and biochemical parameters in uremic patients.

Main Methods:

• Analysis of creatine phosphokinase (CPK) levels and isoenzymes in 90 patients undergoing regular dialysis.
• Correlation analysis with biochemical markers (calcium, phosphorus, parathyroid hormone), body weight, muscle weakness, hypothyroidism, and vitamin D status.

Main Results:

• 42% of dialysis patients showed elevated CPK levels, primarily CPK MM.
• Elevated CPK MM did not correlate with calcium, phosphorus, calcium x phosphorus product, dry weight, or parathyroid hormone.
• High CPK levels correlated with muscle weakness in males, hypothyroidism, and inversely with vitamin D supplementation.

Conclusions:

• Elevated CPK in uremia is likely secondary to skeletal muscle abnormalities.
• Hypothyroidism and vitamin D deficiency may contribute to the development of uremic myopathy.