To assess the usefulness of optic nerve sheath diameter and Neuron Specific Enolase in predicting neurological outcomes after In Hospital cardiac arrest.

Postcardiac arrest brain injury is the main cuase of long term diasbility in those who survive the acute phase. even among those who survive the acute phase. in this prospective observational study will be conducted in max hospital vaishali . patient will be recruited as per inclusion criteriaas mentioned. ONSD measurment will be taken on day 1 2 and 3 post cradiac arrest survival and NSE will be taken on day 3 post cardiac arrest survival through cpc scoring. the sensitivity and specificty of this test will be carried out.