Despite 30 years of intensive research, morbidity and mortality of sepsis in surgical intensive care unit (ICU) patients remain unacceptably high. Although recent advances in early ICU care have reduced in-hospital mortality, with the aging population a new epidemic of chronic critical illness (CCI) has emerged and its progression into what we call the persistent inflammation, immunosuppression and catabolism syndrome (PICS) has unacceptable morbid long-term consequences. Our overarching hypothesis is that PICS is now a predominant clinical trajectory in the surgical ICU patients after sepsis, and is the greatest, near-term clinical challenge in surgical ICUs. We further hypothesize that PICS is caused, at least in part, by dysregulated myelopoiesis and expansion of myeloid-derived suppressor cells (MDSCs), aggravated by aging and largely driven by acute kidney injury (AKI), resulting in imbalance of angiogenic and anti-angiogenic factors. This Sepsis and Critical Illness Research Center (SCIRC) application comprises four projects and five cores drawn from two colleges (Medicine and Public Health and Health Professions) and eight University of Florida Health departments (Surgery, Medicine, Anesthesiology, Biostatistics, Molecular Genetics and Microbiology, Aging and Geriatric Research, and Physical Therapy) and will address the following questions in four projects: #1a) What is the incidence and early risk factors for CCI in septic surgical ICU patients and what are the long-term cognitive and functional consequences? #1b) Can novel biomarkers predict, early, which patients will develop CCI, and, later, which CCI patients will have morbid long-term outcomes (i.e., PICS)? #2) Is PICS inherently driven by dysregulation in myelopoiesis and inappropriate MDSC expansion, promoting persistent inflammation, immunosuppression and catabolism?;#3) Does AKI, through dysregulation of anti-angiogenic and angiogenic cytokines, drive the expansion of MDSCs, inflammation, and anti-angiogenesis?;and #4) Does CCI contribute significantly to muscle atrophy, especially in mechanically ventilated patients'diaphragms and extremities, and will resistance exercise improve muscle strength, reduce inflammation, and alter the trajectory of CCI away from the PICS phenotype? We will study 400 surgical ICU patients who develop sepsis for at least one year, and use murine models of chronic polymicrobial sepsis for mechanistic studies and interventional methods. We recognize that no single therapeutic intervention will prevent PICS, but the SCIRC's overall goal is to understand the prevalence and pathogenesis of this new syndrome at a mechanistic level. Only through multi-disciplinary translational research by basic and clinical scientists with diverse expertise in critical care medicine, physical therapy, immunology, molecular biology, and understanding of muscle, kidney, and aging physiology, can CCI progression into PICS be understood and novel therapies developed.
Mortality from sepsis has been declining due in part to early detection and improved, evidence-based guidelines for its treatment. However, with improved in-hospital survival, we are seeing an increasing number of sepsis patients who are becoming chronic critically ill (CCI) and expressing a persistent, inflammation, immunosuppression and catabolism syndrome (PICS) associated with morbid long-term outcomes. This Program proposes to investigate and describe the epidemiology of CCI and PICS in sepsis patients, identify early biomarkers that can predict its incidence and outcome, explore mechanisms that drive this process, and examine potential interventions to prevent the development of PICS in septic CCI patients.
| Loftus, Tyler J; Kannan, Kolenkode B; Carter, Christy S et al. (2018) Persistent injury-associated anemia in aged rats. Exp Gerontol 103:63-68 |
| Stortz, Julie A; Mira, Juan C; Raymond, Steven L et al. (2018) Benchmarking clinical outcomes and the immunocatabolic phenotype of chronic critical illness after sepsis in surgical intensive care unit patients. J Trauma Acute Care Surg 84:342-349 |
| Raymond, Steven L; Hawkins, Russell B; Murphy, Tyler J et al. (2018) Impact of toll-like receptor 4 stimulation on human neonatal neutrophil spontaneous migration, transcriptomics, and cytokine production. J Mol Med (Berl) 96:673-684 |
| Davoudi, Anis; Corbett, Duane B; Ozrazgat-Baslanti, Tezcan et al. (2018) Activity and Circadian Rhythm of Sepsis Patients in the Intensive Care Unit. IEEE EMBS Int Conf Biomed Health Inform 2018:17-20 |
| Loftus, Tyler J; Morrow, Megan L; Lottenberg, Lawrence et al. (2018) The Impact of Prior Laparotomy and Intra-abdominal Adhesions on Bowel and Mesenteric Injury Following Blunt Abdominal Trauma. World J Surg : |
| Loftus, Tyler J; Mira, Juan C; Miller, Elizabeth S et al. (2018) The Postinjury Inflammatory State and the Bone Marrow Response to Anemia. Am J Respir Crit Care Med 198:629-638 |
| Loftus, Tyler J; Kannan, Kolenkode B; Carter, Christy S et al. (2018) Persistent injury-associated anemia and aging: Novel insights. J Trauma Acute Care Surg 84:490-496 |
| Loftus, Tyler J; Dessaigne, Camille G; Croft, Chasen A et al. (2018) A protocol for non-operative management of uncomplicated appendicitis. J Trauma Acute Care Surg 84:358-364 |
| Rincon, J C; Cuenca, A L; Raymond, S L et al. (2018) Adjuvant pretreatment with alum protects neonatal mice in sepsis through myeloid cell activation. Clin Exp Immunol 191:268-278 |
| Brakenridge, Scott C; Efron, Philip A; Stortz, Julie A et al. (2018) The impact of age on the innate immune response and outcomes after severe sepsis/septic shock in trauma and surgical intensive care unit patients. J Trauma Acute Care Surg 85:247-255 |
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