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Marchesi S, Ortiz Nieto F, Ahlgren KM, Roneus A, Feinstein R, Lipcsey M, Larsson A, Ahlström H, Hedenstierna G. Abdominal organ perfusion and inflammation in experimental sepsis: a magnetic resonance imaging study. Am J Physiol Gastrointest Liver Physiol 2019; 316:G187-G196. [PMID: 30335473 DOI: 10.1152/ajpgi.00151.2018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Diffusion-weighted magnetic resonance imaging (DW-MRI) uses water as contrast and enables the study of perfusion in many organs simultaneously in situ. We used DW-MRI in a hypodynamic sepsis model, comparing abdominal organ perfusion with global hemodynamic measurements and inflammation. Sixteen anesthetized piglets were randomized into 3 groups: 2 intervention (sepsis) groups: HighMAP (mean arterial pressure, MAP > 65 mmHg) and LowMAP (MAP between 50 and 60 mmHg), and a Healthy Control group (HC). Sepsis was obtained with endotoxin and the desired MAP maintained with norepinephrine. After 6 h, DW-MRI was performed. Acute inflammation was assessed with IL-6 and TNFα in abdominal organs, ascites, and blood and by histology of intestine (duodenum). Perfusion of abdominal organs was reduced in the LowMAP group compared with the HighMAP group and HC. Liver perfusion was still reduced by 25% in the HighMAP group compared with HC. Intestinal perfusion did not differ significantly between the intervention groups. Cytokine concentrations were generally higher in the LowMAP group but did not correlate with global hemodynamics. However, cytokines correlated with regional perfusion and, for liver and intestine, also with intra-abdominal pressure. Histopathology of intestine worsened with decreasing perfusion. In conclusion, although a low MAP (≤60 mmHg) indicated impeded abdominal perfusion in experimental sepsis, it did not predict inflammation, nor did other global measures of circulation. Decreased abdominal perfusion partially predicted inflammation but intestine, occupying most of the abdomen, and liver were also affected by intra-abdominal pressure. NEW & NOTEWORTHY The study increases the knowledge of abdominal perfusion during sepsis. We used diffusion weighted imaging to assess perfusion simultaneously and noninvasively in different abdominal organs. The technique has not been used in a sepsis model before. Cytokine concentrations were measured in different abdominal organs and vascular beds and related to regional perfusion. Decreased abdominal perfusion, but not global measures of circulation, predicted inflammation. Intestine, occupying most of the abdomen, and liver were also affected by intra-abdominal pressure.
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Affiliation(s)
- Silvia Marchesi
- Hedenstierna Laboratoriet, Department of Surgical Science, Uppsala University , Uppsala , Sweden
| | | | - Kerstin M Ahlgren
- Hedenstierna Laboratoriet, Department of Surgical Science, Uppsala University , Uppsala , Sweden
| | - Agneta Roneus
- Hedenstierna Laboratoriet, Department of Surgical Science, Uppsala University , Uppsala , Sweden
| | | | - Miklos Lipcsey
- Hedenstierna Laboratoriet, Department of Surgical Science, Uppsala University , Uppsala , Sweden
| | - Anders Larsson
- Hedenstierna Laboratoriet, Department of Surgical Science, Uppsala University , Uppsala , Sweden
| | - Håkan Ahlström
- Section of Radiology, Department of Surgical Science, Uppsala University , Sweden
| | - Göran Hedenstierna
- Hedenstierna Laboratoriet, Department of Surgical Science, Uppsala University , Uppsala , Sweden
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