The nurse administered edrophonium (Tensilon), a cholinesterase inhibitor, to a client diagnosed with rule-out myasthenia gravis (MG). Which response by the client indicates the client has myasthenia...

The nurse administered edrophonium (Tensilon), a cholinesterase inhibitor, to a client diagnosed with rule-out myasthenia gravis (MG). Which response by the client indicates the client has myasthenia gravis?

1. The client loses the ability to breathe without mechanical support.

2. The client’s strength improves briefly without signs of fasciculations.

3. The client cannot gaze at the ceiling for 2 minutes without fatigue.

4. The client’s paroxysmal atrial tachycardia converts to normal sinus rhythm.