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A patient complains of muscle weakness and fatigability that improves with rest. What is the most likely diagnosis?

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Final answer:

The most likely diagnosis for a patient with muscle weakness and fatigability that improves with rest is myasthenia gravis, a genetic neuromuscular disorder characterized by fluctuating muscle weakness and fatigue.

Step-by-step explanation:

The most likely diagnosis for a patient who complains of muscle weakness and fatigability that improves with rest is myasthenia gravis, which is a genetic neuromuscular disorder characterized by fluctuating muscle weakness and fatigue. The symptoms described by the patient, along with the improvement of symptoms with rest, align with the characteristics of myasthenia gravis. This disorder is caused by the immune system blocking acetylcholine receptors on muscle cells, leading to progressive muscle weakness and fatigue.

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