{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2023,10,10]],"date-time":"2023-10-10T05:03:09Z","timestamp":1696914189824},"reference-count":14,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2001,5,29]],"date-time":"2001-05-29T00:00:00Z","timestamp":991094400000},"content-version":"vor","delay-in-days":28,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Muscle and Nerve"],"published-print":{"date-parts":[[2001,5]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>We present the results of subcutaneous microdialysis, a new minimally invasive biochemical monitoring technique, in mitochondrial cytopathy. We studied 6 ambulatory patients with mitochondrial cytopathy and 6 controls without mitochondrial disease using a subcutaneous probe for continuous microdialysis, and obtained measurements of lactate, pyruvate, and glucose from samples gathered at 30\u201360 min intervals during the day and at 3\u2010h intervals at night. The lactate:pyruvate ratio (LPR) was calculated and related to disease severity and metabolic stress. Microdialysis was well tolerated. Controls had stable lactate and pyruvate values in the normal range and a low LPR (average values between 0.0114 and 0.0145). Patients had widely fluctuating lactate and pyruvate values, a higher average LPR between 0.0187 and 0.0724, and marked diurnal variation, especially in the severely affected patients. Increases in the LPR coincided with metabolic stress in individual cases. We conclude that subcutaneous microdialysis is well tolerated and enables continuous metabolic monitoring of patients with mitochondrial cytopathy. It has particular potential for use in the identification of metabolic risk factors and may help to assess the impact of therapeutic regimens. \u00a9 2001 John Wiley &amp; Sons, Inc. 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