Mitochondrial respiratory-chain defects presenting as nonspecific features in children.

Abstract excerpt

Patients with mitochondrial respiratory-chain defects frequently exhibit lactic acidosis, ragged red fibers in skeletal muscle samples, and abnormal enzyme assays for the respiratory-chain complex. However, ragged red fibers and lactic acidosis are not always seen in all patients with mitochondrial respiratory-chain defects. We have encountered six children with biochemically proven respiratory chain defects, but...

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