There were no critical events in either group : In PRO , mean BP during MRI ( from @ @ to @ mmHg ) was significantly less than before anesthesia ( @ @ mmHg ) , while HR remained relatively constant ( range of @-@ ) at its baseline of @ @ , but in DEX , mean BP remained unchanged ( from @ @ to @ @ ) during anesthesia compared with before anesthesia ( @ @ mmHg ) , while HR decreased ( @ @ to @ @ ) during anesthesia from its baseline ( @ @ ) .