Abstract
Respiratory insufficiency occurs frequently in patients with myotonic dystrophy (MyD). We have performed a quantitative study of neurons linked to respiratory function in the dorsal central medullary nucleus (DCMN), the ventral central medullary nucleus (VCMN), and the subtrigeminal medullary nucleus (SMN) in seven patients with MyD and eight age-matched controls. Alveolar hypoventilation of the central type occurred in three of the MyD patients but not in the remaining MyD patients or controls. The densities of neurons of the DCMN, the VCMN, and the SMN in MyD patients with hypoventilation were significantly lower than in MyD without hypoventilation and controls. These data suggest the neuronal loss of the DCMN, VCMN, and SMN is associated with the presence of hypoventilation in MyD and may be an important feature of MyD.
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