Progression

Duchenne's

Males

Toddler or preschool

Initial loss of pelvic girdle and shoulder muscle control; Gower's sign; rapid progression with death in late adolescence or 20s from cardiac or respiratory complications

Becker's

Males

Early teens

Similar to Duchenne's, no cardiac involvement; slow, near-normal life span

(table continues on page 638)

638 Muscular Dystrophy

• TABLE S Four Types of Muscular Dystrophy (continued)
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