Neurology diagnoses and treats disorders of the nervous system, including the brain, spinal cord, and nerves, as well as thought and memory.
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The clinical presentation of neuromuscular disorders in children is distinct because it occurs against the backdrop of a developing nervous system. The symptoms are rarely painful; instead, they present as a failure of function. The “floppy infant” and the “clumsy child” are the two most common presentations that trigger a referral to a neuromuscular specialist.
In the neonatal period and early infancy, neuromuscular disorders manifest primarily as hypotonia. When the baby is lifted under the arms, they may slip through the examiner’s hands due to lack of shoulder tone. They may have a “frog leg” posture when lying on their back, unable to lift their limbs against gravity.
Severe weakness in utero can lead to decreased fetal movement. This lack of movement can cause the joints to freeze in place, a condition known as arthrogryposis. A baby born with multiple joint contractures (stiff knees, elbows, or hips) requires an immediate evaluation for a congenital neuromuscular condition.
As the child grows, the primary symptom becomes motor delay. The child may be late to roll over, sit, or walk. In conditions like Duchenne Muscular Dystrophy, the weakness is proximal, meaning it affects the hips and shoulders more than the hands and feet. This leads to a distinct way of standing up from the floor.
Gowers’ sign is a classic maneuver used by children with proximal weakness. To get up from the floor, the child turns face down, pushes up with their arms, and then “walks” their hands up their legs to push their torso upright. This sign is almost pathognomonic for Duchenne and Becker Muscular Dystrophy.
Neuromuscular disorders often affect the bulbar muscles—the muscles of the face, mouth, and throat. This can lead to feeding difficulties, a weak cry, or a lack of facial expression. In Myasthenia Gravis, the eyelids may droop (ptosis), and the symptoms may worsen as the day goes on due to fatigue.
Respiratory muscle weakness is a silent killer. The diaphragm and intercostal muscles may be too weak to inflate the lungs fully or cough effectively. This leads to recurrent pneumonia and nocturnal hypoventilation. A weak cough is a major red flag that requires immediate respiratory intervention.
Muscle weakness leads to an imbalance of forces across the joints. Over time, this causes the joints to become stiff and fixed (contractures). The most common site is the Achilles tendon, leading to toe walking. As the muscles around the spine weaken, severe curvature of the spine (scoliosis) can develop rapidly, especially after the child loses the ability to walk.
In Charcot Marie Tooth disease, the weakness is distal (hands and feet). This leads to high arched feet (pes cavus) and hammertoes. The shins may look very thin (“stork legs”) due to muscle wasting. Hand weakness can lead to difficulty with buttons, zippers, and handwriting.
Many neuromuscular disorders are multisystem diseases. The heart is a muscle, and it is frequently affected. Cardiomyopathy (weakness of the heart muscle) is a leading cause of mortality in Duchenne Muscular Dystrophy. Regular cardiac screening is essential even if the child has no cardiac symptoms.
Malignant hyperthermia is a critical risk factor for certain myopathies (like Central Core Disease). This is a severe, life threatening reaction to anesthesia. Knowing the diagnosis before any surgery is vital to avoid triggering agents that could cause a fatal metabolic crisis.
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Toe walking can be a habit, but in neuromuscular disease, it is often caused by the shortening (contracture) of the Achilles tendon due to muscle weakness and imbalance.
Regression means the child is losing abilities they once had, such as a toddler who could walk suddenly starting to crawl again; this is a serious sign of progressive disease.
Usually, the muscle weakness itself is not painful, but the cramps, tight joints, and scoliosis that develop later can cause discomfort that needs management.
The heart is a muscle too; in diseases like Duchenne, the heart muscle gets replaced by scar tissue (cardiomyopathy), which requires medication to protect heart function.
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