Comparing Hypothermic Temperatures During Hemiarch Surgery

Exclusion Criteria

• •Surgery for acute aortic dissection or emergent operations
• •Total arch replacement
• •Inability to perform unilateral selective anterograde cerebral perfusion (uSACP)
• •Patients with known/documented coagulopathy
• •Patients with cold agglutinin disease or those that test positive on routine preop screening
• •Pre-existing severe neurological impairment or inability to accurately assess neurocognitive function as determined by the operating surgeon
• •Severe carotid disease, defined as: any patient with previously documented carotid stenosis of \> 70% (via Doppler ultrasound (US), magnetic resonance angiography (MRA), or computer tomography angiography (CTA)) without neurological deficits; or carotid stenosis \> 50% with neurological deficits; or previous carotid endarterectomy or stenting
• •Patients in renal failure or currently being treated with renal replacement therapy (RRT) or estimated glomerular filtration rate (eGFR) \< 30 ml/min/1.73m2
• •Use of an investigational drug or device at time of enrollment
• •Participation in another clinical trial which interferes with performance of the study procedures or assessment of the outcomes