What change in muscle strength does a nurse expect in a client with myasthenia gravis?

In clients with myasthenia gravis, the expected change in muscle strength is characterized by fluctuating weakness, particularly affecting muscles that are innervated by cranial nerves. This condition is an autoimmune disorder that impairs communication between nerves and muscles, leading to muscle weakness that can vary in intensity throughout the day or during activity.

As patients use their muscles, especially those related to eye movement, facial expressions, and swallowing, they often experience increased weakness. This is because muscle fatigue occurs with prolonged activity due to the depleted number of acetylcholine receptors at the neuromuscular junction. However, with periods of rest, patients may experience a temporary improvement in muscle strength. This pattern of gradual weakening with exertion and partial recovery after rest is a hallmark of myasthenia gravis.

While some options might refer to aspects of muscle strength changes, they do not reflect the typical clinical manifestations specific to myasthenia gravis as accurately as the fluctuating nature of weakness does. Understanding this characteristic helps in managing the condition and setting appropriate therapeutic goals for patients.