Sam Underwood

Sam Underwood
Occupation	Researcher

Sam Underwood is a researcher affiliated with the University of Maine (Orono) whose published work concerns trauma surgery and transfusion medicine, including studies on blood product storage, massive transfusion protocols, and hemorrhage control techniques.

Research

Underwood's publication record, as indexed by Semantic Scholar, comprises 51 papers with a combined total of 1,269 citations and an h-index of 19. The work spans topics such as thrombelastography, cryopreserved red blood cell transfusion, resuscitative endovascular balloon occlusion of the aorta (REBOA), and coagulation abnormalities in trauma and COVID-19 patients.

One frequently cited study, published in Annals of Emergency Medicine in 2018, examined the relationship between blood storage age and outcomes in massively transfused trauma patients as a secondary analysis of the PROPPR trial, and has been cited 53 times. Another study, published in Surgery in 2015, linked splenectomy to hypercoagulable thrombelastography values and increased thromboembolism risk, accumulating 50 citations. A 2015 randomized trial in Annals of Surgery on the transfusion of cryopreserved packed red blood cells after trauma has been cited 27 times.

Selected publications

• "Extreme γ' fibrinogen levels in COVID-19 patients" (2022), medRxiv
• "Implementing thrombelastography: Experiences from a level I trauma institution" (2020), Transfusion
• "Use of Bilobed Partial Resuscitative Endovascular Balloon Occlusion of the Aorta (pREBOA) is Logistically Superior in Prolonged Management of a Highly Lethal Aortic Injury" (2020), Journal of Trauma and Acute Care Surgery
• "The effects of cryopreserved red blood cell transfusion on tissue oxygenation in obese trauma patients" (2018), Journal of Trauma and Acute Care Surgery
• "Older blood is associated with increased mortality and adverse events in massively transfused trauma patients: secondary analysis of the PROPPR trial" (2018), Annals of Emergency Medicine
• "Massive Transfusion Protocols" (2016)
• "Transfusion of cryopreserved packed red blood cells is safe and effective after trauma: a prospective randomized trial" (2015), Annals of Surgery
• "Efficacy and Safety of Frozen Blood for Transfusion in Trauma Patients - A Multi-Center Trial" (2015)
• "Splenectomy is associated with hypercoagulable thrombelastography values and increased risk of thromboembolism" (2015), Surgery
• "Human dose confirmation for self-expanding intra-abdominal foam: A translational, adaptive, multicenter trial in recently deceased human subjects" (2015), Journal of Trauma and Acute Care Surgery

External links

• Semantic Scholar author profile