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1.  Laboratory Abnormalities in Patients with Myotonic Dystrophy Type 2 
Archives of neurology  2011;68(9):1180-1184.
Background
Myotonic dystrophy type-2 (DM2) is a recently discovered adult muscular dystrophy. Similar to DM1, this disease causes progressive debilitating weakness, clinical myotonia, and early cataracts, and is thought to cause widespread physiologic dysfunction of multiple organ systems.
Objective
To analyze and compile the laboratory abnormalities of patients with DM2.
Design
Baseline DM2 laboratory data were compiled representing 68 different types of laboratory tests and 1442 total studies.
Setting
University Medical Center.
Patients
Eighty-three adults with genetically confirmed or clinically probable DM2 were identified. Of these patients, 49 had documented baseline laboratory screening.
Main Outcome Measures
The individual frequencies of abnormal values in the population with DM2 studied.
Results
Of the 1442 studies, results for 359 (24.9%) were outside of their standard reference ranges. Of the 68 types of laboratory tests studied, 43 had values from fifteen or more different patients with DM2. The relative frequency of an abnormally elevated laboratory value was greater than 50% in several tests, including the levels of creatine kinase, total cholesterol, lactate dehydrogenase, and alanine aminotransferase (ALT). In addition, serum levels of immunoglobulin G (IgG) were low in 75% of all DM2 patients tested and absolute lymphocyte counts were low in 54% of all DM2 patients tested.
Conclusion
There is a high frequency of laboratory abnormalities in patients with DM2. These abnormalities provide insight into the widespread pathologic manifestations of DM2 and may form a basis for clinical monitoring and disease screening.
doi:10.1001/archneurol.2011.191
PMCID: PMC3429333  PMID: 21911698

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