meaning of linguistic interpreter

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the patient is an elderly man in a hospital,waitng toreceive a treatment for his heart conditon.he doesn't know anything about it.his osn was interpreting and making decisons for him before.the doctor is recommending an operation,and says it's a routine operation with a 100% success rate. what will happen to the patient if the interpreter is using (1) linguistic model? and (2) community interpreting