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Adjuvant therapies to fluid resuscitation in experimental sepsis: Intervention studies in models of ARDS and peritonitis
ISBN: 9151316862 ;ISBN: 9789151316864
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Title:
Adjuvant therapies to fluid resuscitation in experimental sepsis: Intervention studies in models of ARDS and peritonitis
Author:
Barrueta Tenhunen, Annelie
Subjects:
Acute respiratory distress syndrome
;
Anaesthesiology and Intensive Care
;
Anestesiologi och intensivvård
;
animal model
;
edema formation
;
fluid resuscitation
;
peritonitis
;
sepsis
Description:
Fluid resuscitation is essential to antagonize the deleterious effects of tissue hypo-perfusion in sepsis. If not thoroughly monitored and individually tailored, fluid therapy increases the risk of volume overload. Volume overload is associated with higher mortality in sepsis. Although considerable progress has been made to understand the complex nature of the cardiovascular derangements in sepsis and septic shock, the optimal fluid resuscitation strategy is yet to be defined. Current guidelines recommend balanced crystalloids and albumin for resuscitation; synthetic colloids are harmful and no longer in use. In search of adjuvant therapies to fluid resuscitation in sepsis and sepsis related complications with a volume sparing potential, this doctoral thesis aimed at exploring the effects of two endogenous molecules involved in fluid homeostasis. In Study I, the peptide containing the active site of the endogenous protein antisecreterory factor (AF-16) reduced lung edema formation, as reflected in a reduction in extra vascular lung water (EVLW), in a model of ventilator induced lung injury (VILI). The aim of Study I was to test the intervention AF-16 in a well-established porcine model of lung edema and capillary leak. In Study II, the intervention AF-16 was tested in a model of fecal peritonitis sepsis. The first aim of Study II was to elaborate a clinically relevant porcine model of fecal peritonitis-sepsis, including a standardized resuscitation protocol. Second aim was to test the effect of the intervention on volume status and inflammation. Wet-to-dry ratio was lower in liver samples of the intervention group, indicating less edema formation. No other differences were detected between intervention and control groups. In Study III, the intervention high molecular weight hyaluronan (HMW-HA) was tested in our model of fecal peritonitis as adjuvant to standardized fluid resuscitation. Fluid balance and the inflammatory response were comparable throughout the experiment in the intervention and control groups. The intervention counteracted the increase in proportion of fragmented hyaluronan associated with peritonitis-sepsis and was associated with lower modified shock index (MSI) than placebo. In Study IV, we administered an increased dose of HMW-HA directly after induction of peritonitis. The aim of Study IV was to study the effects of the intervention in a fluid restrictive model, to reduce a potentially negative effect of crystalloid infusion per se on the endothelial glycocalyx layer. In Study IV, hemodynamics and surrogate markers of endothelial damage were comparable in the intervention and control groups. The intervention was associated with an increase in cardiac output and diastolic blood pressure during the infusion, these effects disappeared as the experiment proceeded. Lactate was higher in the intervention group as a function of time.
Creation Date:
2023
Language:
English
Identifier:
ISBN: 9151316862
ISBN: 9789151316864
Source:
SWEPUB Freely available online
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