 Little is known about the long-term neurological outcomes after in-hospital cardiac arrest IHCA. It is also not known whether withdrawal of life-sustaining measures will influence rates of survivors with poor neurological status. Currently, withdrawal of care in comatose patients after cardiac arrest is strongly forbidden by law in Korea. However, a new legislation on allowing withdrawal of care will come into effect since early 2018 in Korea. The investigators aim to determine 1 long-term neurological outcomes in patients who developed IHCA, 2 whether early neurological status can predict late neurological status after IHCA, and 3 whether the proportion of IHCA survivors with good neurological outcomes will change since implementation of new legislation on withdrawal of care. 