Dr. Johnson, suspecting nothing so grave as this, had sent Johnny into Greenfield that morning--luckily with a nurse--for his metabloism test.
from Death Be Not Proud by John Gunther
This sentence uses two appositive phrases. One set apart by commas and the other set apart by dashes.
The mother, hoping that everything was alright, had rushed to the hospital that evening--luckily wtih a friend--for her son.