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- Abrahamsson, Pernilla, et al.
(författare)
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Outcome of microdialysis sampling on liver surface and parenchyma
- 2016
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Ingår i: Journal of Surgical Research. - : Elsevier BV. - 0022-4804 .- 1095-8673. ; 200:2, s. 480-487
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Tidskriftsartikel (refereegranskat)abstract
- Background: To investigate whether surface microdialysis (μD) sampling in probes covered by a plastic film, as compared to noncovered and to intraparenchymatous probes, would increase the technique's sensitivity for pathophysiologic events occurring in a liver ischemia-reperfusion model. Placement of μD probes in the parenchyma of an organ, as is conventionally done, may cause adverse effects, e.g., bleeding, possibly influencing outcome.Methods: A transient ischemia-reperfusion model of the liver was used in six anesthetized normoventilated pigs. μD probes were placed in the parenchyma and on the liver surface. Surface probes were either left uncovered or were covered by plastic film.Results: Lactate and glucose levels were significantly higher in plastic film covered probes than in uncovered surface probes throughout the ischemic period. Glycerol levels were significantly higher in plastic film covered probes than in uncovered surface probes at 30 and 45 min into ischemia.Conclusions: Covering the μD probe increases the sensibility of the μD–technique in monitoring an ischemic insult and reperfusion in the liver. These findings confirm that the principle of surface μD works, possibly replacing need of intraparenchymatous placement of μD probes. Surface μD seemingly allows, noninvasively from an organ's surface, via the extracellular compartment, assessment of intracellular metabolic events. The finding that covered surface μD probes allows detection of local metabolic changes earlier than do intraparenchymatous probes, merit further investigation focusing on μD probe design.
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| 5. |
- Dillström, M., et al.
(författare)
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Patients' experience of acute unplanned surgical reoperation
- 2017
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Ingår i: Journal of Surgical Research. - : Elsevier BV. - 0022-4804 .- 1095-8673. ; 209, s. 199-205
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Tidskriftsartikel (refereegranskat)abstract
- Background Undergoing surgery always involves various risks of complications, often depending on the type of surgery. Because of complications, a second surgical intervention, a reoperation, must occasionally be done, which in turn often causes an extended hospital stay, a longer recovery phase, greater suffering for the patient, and higher health care costs. Even though complications after general surgery are relatively common, little is known regarding patient experience of a reoperation. Knowledge of this could impact on care models in the future. The aim of this study was to describe patients' experience of acute, unplanned reoperation during a planned hospital stay. Materials and methods A purposive sampling strategy was used, and 16 patients were included, all who had undergone acute unplanned reoperation during a planned hospital stay. Semi-structured interviews were used to collect data, and a content analysis with an inductive approach was used for data analysis. Results The analysis resulted in two main themes: (1) health professionals' importance, having its foundation in categories trust and information, and (2) reaction, based on the categories anxiety and sadness. Conclusions Unplanned reoperation caused psychological, social, and existential reactions. Health care professionals were perceived as important because good communication, accurate information, their presence, and creating feelings of confident and safe care were meaningful factors for the patients as they managed the situation. © 2016 Elsevier Inc.
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| 7. |
- Lundberg, J., et al.
(författare)
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Liver parenchyma access and lesion marker via the endovascular route
- 2015
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Ingår i: Journal of Surgical Research. - : Elsevier BV. - 0022-4804 .- 1095-8673. ; 195:2, s. 488-494
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Tidskriftsartikel (refereegranskat)abstract
- Background Neoadjuvant chemotherapeutic regimens for metastatic colorectal cancer are now so effective that they can cause "vanishing" lesions. With new advances such as local ablation, intra-arterial treatments in bolus with pumps or with beads, and isolation of hepatic perfusion, the need for a working channel to the liver may be warranted, ideally reducing the risk of spreading neoplastic cells. Materials and methods The endovascular trans-vessel wall Extroducer device makes it possible to gain direct access to the liver parenchyma. The distal tip is then detached, to act as both a marker and a securing plug in the vessel defect. We used ex vivo and in vivo tests to evaluate the device as a working channel for local administration of substances to the parenchyma and as a marker for detection with both transabdominal and intraoperative ultrasonography. Results We could deploy the Extroducer device without any hemorrhagic or thromboembolic complications in vivo, and we were able to detect all markers ex vivo and in vivo using both transabdominal and intraoperative ultrasonography. Furthermore, we found that it is possible to administer substances to the liver parenchyma using the catheter. Conclusions The trans-vessel wall technique can be used to establish a working channel to the liver parenchyma for administration of any substance, such as chemotherapeutic agents or cells. The detached device can also be used as a marker for ultrasound-guided partial liver resection in "vanishing lesions." The technique should have a low risk of seeding of neoplastic cells. This study in large animals forms a strong basis for translation to clinical studies.
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| 8. |
- Macarak, Edward J., et al.
(författare)
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Trametinib prevents mesothelial-mesenchymal transition and ameliorates abdominal adhesion formation
- 2018
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Ingår i: Journal of Surgical Research. - : ACADEMIC PRESS INC ELSEVIER SCIENCE. - 0022-4804 .- 1095-8673. ; 227, s. 198-210
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Tidskriftsartikel (refereegranskat)abstract
- Background: Intra-abdominal adhesions are a major cause of morbidity after abdominal or gynecologic surgery. However, knowledge about the pathogenic mechanism(s) is limited, and there are no effective treatments. Here, we investigated a mouse model of bowel adhesion formation and the effect(s) of an Federal Drug Administration-approved drug (trametinib) in preventing adhesion formation. Materials and methods: C57BL/6 mice were used to develop a consistent model of intra-abdominal adhesion formation by gentle cecal abrasion with mortality rates of <10%. Adhesion formation was analyzed histologically and immunochemically to characterize the expression of pro-fibrotic marker proteins seen in pathologic scaring and included alpha smooth muscle actin (alpha SMA) and fibronectin EDA (FNEDA) which arises from alternative splicing of the fibronectin messenger RNA resulting in different protein isoforms. Trichrome staining assessed collagen deposition. Quantitative polymerase chain reaction analysis of RNA isolated from adhesions by laser capture microscopy was carried out to assess pro-fibrotic gene expression. To block adhesion formation, trametinib was administered via a subcutaneous osmotic pump. Results: Adhesions were seen as early as post-operative day 1 with extensive adhesions being formed and vascularized by day 5. The expression of the FNEDA isoform occurred first with subsequent expression of alpha SMA and collagen. The drug trametinib was chosen for in vivo studies because it effectively blocked the mesothelial to mesenchymal transition of rat mesothelium. Trametinib, at the highest dose used (3 mg/kg/d), prevented adhesion formation while at lower doses, adhesions were usually limited, as evidenced by the presence of FNEDA isoform but not alpha SMA. Conclusions: Cecal abrasion in mice is a reliable model to study abdominal adhesions, which can be ameliorated using the MEK1/2 inhibitor trametinib. While blocking adhesion formation at the cell and molecular levels, trametinib, at the therapeutic doses utilized, did not impair the wound healing at the laparotomy site.
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