Pilot Clinical Study of the LRS ThermoSuit™ System in Post Arrest Patients

Inclusion Criteria: * Cardiac arrest prior to or during hospital admission, with restoration/return of spontaneous circulation (ROSC). * Cardiac arrest of presumed cardiac origin. * Initial (pre-resuscitation) cardiac rhythm of ventricular fibrillation, non-perfusing ventricular tachycardia, pulseless electrical activity, or asystole. * Estimated or known age \> 18 years. * Intubation, ventilation and placement of esophageal probe. * Estimated time from collapse to the initiation of Advanced Cardiac Life Support (ACLS) \< 15 minutes and return of spontaneous circulation with defibrillation within 60 minutes of collapse. * Persistent neurologic dysfunction i.e. comatose upon enrollment \[GCS ≤ 8\]. Exclusion Criteria: * Height greater than 188 cm. * Elbow-to-elbow width greater than 60 cm (as measured above the supine patient). * Core temperature less than 34°C after ROSC (as measured at the tympanic membrane, esophagus, sub-lingual space, nasopharynx, or central blood vessel). * Comatose state before the cardiac arrest due to the administration of drugs that depress the central nervous system. * Known pregnancy. * Response to verbal commands after ROSC (but before enrollment). * Known terminal illness that preceded the arrest. * Known enrollment in another study of a device, drug, or biologic. * Major trauma or other co-morbidity requiring urgent surgery. * Improving neurologic status. * \> 8 hours since return of spontaneous circulation. * Unknown time of arrest. * Severe or known coagulopathy (with active bleeding). * Hemodynamic instability despite vasopressors (SBP \< 90 mmHg or MAP \< 60 mmHg for \> 30 minutes after ROSC and before enrollment).