Final answer:
In the case of a sudden worsening of myasthenia gravis with difficulty in breathing, the initial treatment is usually an increased dose of anticholinesterase drugs.
Step-by-step explanation:
When a client with myasthenia gravis (MG) experiences a sudden worsening of their condition with difficulty in breathing, the initial treatment typically involves an increased dose of anticholinesterase drugs. These drugs help to improve muscle strength and function by inhibiting the breakdown of acetylcholine, a neurotransmitter that plays a crucial role in muscle contraction.