Which test involving injection of a drug would the nurse anticipate being ordered to diagnose myasthenia gravis (MG)?
1. A Tensilon test
2. A computed tomography (CT) scan of the legs
3. A nerve stimulation study
4. Analysis of antiacetylcholine receptor antibodies
1
Rationale 1: This test involves intravenous administration of Tensilon. A positive response is an increase in muscle strength and is diagnostic of MG.
Rationale 2: A computed tomography (CT) scan of the legs is not indicated for this patient.
Rationale 3: The nerve stimulation study can be done to help diagnose MG but does not require a drug injection.
Rationale 4: An analysis of antiacetylcholine receptor antibodies can help diagnose MG, but it does not require a drug injection.
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