ICU Survivors' dementia risk under the microscope

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: \*Adult patients in a medical and/or surgical ICU for the treatment of: * shock (e.g., with vasopressors, * intra-aortic balloon pump, * Extracorporeal Membrane Oxygenation therapy) and/or * respiratory failure \[e.g., on mechanical ventilation or non-invasive positive pressure ventilation (NIPPV)\] Exclusion Criteria: 1. MRI incompatibility (e.g. known claustrophobia, permanent metal implants) 2. Cumulative ICU time \> 5 days in the past 30 days, prior to this hospitalization 3. Inability to start the informed consent process within the 72 hours following organ failure: * Attending physician refusal * Patient and/or surrogate refusal * 72-hour period of eligibility was exceeded before the patient was screened * Patient unable to consent and no surrogate available within the 72-hour period 4. Residence \> 100 miles from study site and do not regularly visit the area. 5. Patients who are homeless and have no secondary contact person available. 6. Cardiac surgery within the current hospitalization 7. Dementia or other chronic neurologic disease or disorder that either makes the patient incapable of living independently at baseline or results in an IQCODE \>3.8(completed by the patient or their qualified surrogate). (Examples include but are not limited to mental illness requiring long-term institutionalization, acquired or congenital mental retardation, Parkinson's disease, Huntington's disease, severe Alzheimer's disease or dementia of any etiology, and debilitating cerebrovascular disease.) 8. Acute or subacute neurologic deficit that is expected to make the patient incapable of living independently after hospital discharge due to cognitive deficits. (Examples include, but are not limited to stroke, intracranial hemorrhage, cranial trauma, intracranial malignancy, anoxic brain injury, and cerebral edema.) 9. Inability to understand English or Spanish or bilateral deafness or bilateral vision loss 10. Current enrollment in a study that does not allow co-enrollment 11. Prisoners 12. Active substance abuse or psychotic disorder (e.g., schizophrenia or schizo-affective disorder) or recent (within the past 2 years) serious suicidal gesture necessitating hospitalization. 13. Expected death within 12 hours of enrollment or lack of commitment to treatment by family or the medical team (e.g., likely to withdraw life support measures within 12 hours of enrollment)