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Lactate-stress testing in 54 patients with mitochondriopathy
J Finsterer1, H Eichberger, C Jarius
1fij@2nr.nkr.magwien.gv.at
European Archives of Psychiatry and Clinical Neuroscience
|March 30, 2000
Summary
The lactate stress test shows 69% sensitivity for diagnosing mitochondrial myopathy. This exercise test helps identify the condition when combined with other diagnostic methods.
Area of Science:
- Neurology
- Metabolic Disorders
- Exercise Physiology
Background:
- Limited data exists on the lactate stress test's utility in mitochondrial myopathy.
- Mitochondrial myopathies are a group of debilitating neuromuscular disorders.
Purpose of the Study:
- To evaluate the sensitivity of the lactate stress test in a larger cohort of patients with mitochondrial myopathy.
- To determine the diagnostic value of the lactate stress test in mitochondrial myopathy.
Main Methods:
- Serum lactate levels were measured in 54 mitochondrial myopathy patients and 47 controls before, during, and after a 15-minute, 30W bicycle ergometer exercise.
- Lactate's upper reference limits were established at rest and various time points during and after exercise.
Main Results:
- The sensitivity of the lactate stress test in diagnosing mitochondrial myopathy was found to be 69%.
- Established reference limits for serum lactate during exercise were: rest (2.0), 5 min (2.1), 10 min (2.1), 15 min (2.1), and 15 min post-exercise (1.8) mmol/l.
Conclusions:
- The lactate stress test is a valuable tool for diagnosing mitochondrial myopathy.
- This test complements electrophysiological and bioptical findings, enhancing diagnostic accuracy.