In patients with spinal muscular atrophy, what is a common symptom seen during infancy?

In patients with spinal muscular atrophy, what is a common symptom seen during infancy?

• A. Progressive hypotonia
• B. Severe limb pain
• C. Joint hypermobility
• D. Neuropathy

Answer: (A)

In spinal muscular atrophy (SMA), a key characteristic symptom in infants is progressive hypotonia, which refers to decreased muscle tone and strength. This condition is due to the degeneration of motor neurons in the spinal cord, leading to muscle weakness and atrophy. During infancy, this progressive hypotonia can manifest as general weakness and difficulties with motor milestones such as sitting up, crawling, or holding the head up. Typically, infants with SMA may exhibit a "floppy" appearance, struggle to achieve typical developmental milestones, and show poor head control. The progression of hypotonia often becomes more evident as the infant grows, particularly in comparison to peers. Identifying hypotonia early is crucial for timely intervention and supportive care. Other symptoms listed, such as severe limb pain, joint hypermobility, and neuropathy, are not characteristic of SMA. Joint hypermobility and neuropathy are more often associated with distinct conditions unrelated to the motor neuron degeneration seen in SMA, and while pain can be experienced in various neurological disorders, it is not a hallmark of this condition in infancy.

In spinal muscular atrophy (SMA), a key characteristic symptom in infants is progressive hypotonia, which refers to decreased muscle tone and strength. This condition is due to the degeneration of motor neurons in the spinal cord, leading to muscle weakness and atrophy. During infancy, this progressive hypotonia can manifest as general weakness and difficulties with motor milestones such as sitting up, crawling, or holding the head up.

Typically, infants with SMA may exhibit a "floppy" appearance, struggle to achieve typical developmental milestones, and show poor head control. The progression of hypotonia often becomes more evident as the infant grows, particularly in comparison to peers. Identifying hypotonia early is crucial for timely intervention and supportive care.

Other symptoms listed, such as severe limb pain, joint hypermobility, and neuropathy, are not characteristic of SMA. Joint hypermobility and neuropathy are more often associated with distinct conditions unrelated to the motor neuron degeneration seen in SMA, and while pain can be experienced in various neurological disorders, it is not a hallmark of this condition in infancy.