Physiologic Signals and Signatures With the Accuryn Monitoring System - The Accuryn Registry

Inclusion Criteria: 1. Signed or Verbal Informed Consent as required by IRB (if applicable). 2. Adult (age ≥ 18). 3. Monitored on the Accuryn® Monitoring System during their procedure and ICU stay (for retrospective enrollment). 4. Patient is undergoing cardiac surgical intervention(s). Exclusion Criteria: 1. Known history of advanced chronic kidney disease defined by an estimated glomerular filtration rate (eGFR) \<20 mL/min/1.73m2 within 30 days prior to procedure. 2. The patient is unsuitable for the study, in the opinion of the investigator. This may include vulnerable patient populations such as pregnant women, prisoners ,or those detained in a penal institution.