Screening and Managing Comorbidities for Patients With Duchenne Muscular Dystrophy

Summary for Physicians

Common Comorbidities in Duchenne Muscular Dystrophy (DMD)
Patients with DMD patients often experience a wide range of comorbidities that require ongoing monitoring and management. These include the following:

1. Cognitive and Behavioral Issues
   1. Affects around 1/3 of patients, presenting as autism, attention-deficit/hyperactivity disorder, learning difficulties, and behavioral challenges.
2. Ophthalmologic Concerns
   1. Annual ophthalmology checkups are recommended due to the risk of cataracts from steroid use.
3. Swallowing and Respiratory Issues
   1. Difficulty in swallowing develops later, but respiratory muscle weakness (diaphragm and intercostal muscles) can cause restrictive lung disease and obstructive sleep apnea.
4. Cardiac Issues
   1. Cardiomyopathy can be detected early, with studies showing changes in cardiac MRI at 10 years old or younger in 17% of patients.
5. Gastrointestinal and Urinary Complications
   1. Common issues include reflux, constipation, urinary urgency, and retention, with kidney stones also a concern in adults due to low water intake.
6. Orthopedic Problems
   1. Patients often develop contractures (ankles, knees, hips, elbows, hands) and scoliosis, though the latter is less common due to steroid use. Some patients may still develop scoliosis in adulthood, requiring surgery.
7. Psychological Problems
   1. Depression, anxiety, and obsessive-compulsive disorder behaviors are common in this population.

Comorbidity Screening Approach
A multidisciplinary approach is crucial for effective care, focusing on early detection and management:

1. Neurological Screening
   1. As a neurologist, I screen for motor and cognitive issues and make referrals to specialists when needed (e.g.eg, gastroenterologists, endocrinologists).
2. Cardiological Monitoring
   1. Regular electrocardiograms, echocardiograms, and cardiac MRIs are essential. Early intervention with medications can prevent cardiac deterioration.
3. Pulmonary Function Testing
   1. Pulmonologists and respiratory therapists perform pulmonary function tests, which are most reliable after 5 years of age.
4. Nutrition Support
   1. Nutritionists monitor and manage obesity (a significant issue due to steroids) by promoting a low-carb, low-fat, low-sugar diet and providing vitamin D and B12 supplements. Regular lab work includes lipid profiles and vitamin testing.
5. Physical and Occupational Therapy
   1. Standardized tests, such as North Star and 10-meter walk/run, help track motor function and progression, guiding equipment needs.