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Volkart S, Kym U, Braissant O, Delgado-Eckert E, Al-Samir S, Angresius R, Huo Z, Holland-Cunz S, Gros SJ. AQP1 in the Gastrointestinal Tract of Mice: Expression Pattern and Impact of AQP1 Knockout on Colonic Function. Int J Mol Sci 2023; 24:ijms24043616. [PMID: 36835026 PMCID: PMC9959819 DOI: 10.3390/ijms24043616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 02/04/2023] [Accepted: 02/06/2023] [Indexed: 02/15/2023] Open
Abstract
Aquaporin 1 (AQP1) is one of thirteen known mammalian aquaporins. Its main function is the transport of water across cell membranes. Lately, a role of AQP has been attributed to other physiological and pathological functions including cell migration and peripheral pain perception. AQP1 has been found in several parts of the enteric nervous system, e.g., in the rat ileum and in the ovine duodenum. Its function in the intestine appears to be multifaceted and is still not completely understood. The aim of the study was to analyze the distribution and localization of AQP1 in the entire intestinal tract of mice. AQP1 expression was correlated with the hypoxic expression profile of the various intestinal segments, intestinal wall thickness and edema, as well as other aspects of colon function including the ability of mice to concentrate stools and their microbiome composition. AQP1 was found in a specific pattern in the serosa, the mucosa, and the enteric nervous system throughout the gastrointestinal tract. The highest amount of AQP1 in the gastrointestinal tract was found in the small intestine. AQP1 expression correlated with the expression profiles of hypoxia-dependent proteins such as HIF-1α and PGK1. Loss of AQP1 through knockout of AQP1 in these mice led to a reduced amount of bacteroidetes and firmicutes but an increased amount of the rest of the phyla, especially deferribacteres, proteobacteria, and verrucomicrobia. Although AQP-KO mice retained gastrointestinal function, distinct changes regarding the anatomy of the intestinal wall including intestinal wall thickness and edema were observed. Loss of AQP1 might interfere with the ability of the mice to concentrate their stool and it is associated with a significantly different composition of the of the bacterial stool microbiome.
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Affiliation(s)
- Stefanie Volkart
- Department of Pediatric Surgery, University Children’s Hospital Basel, 4056 Basel, Switzerland
- Department of Clinical Research, University of Basel, 4001 Basel, Switzerland
| | - Urs Kym
- Department of Pediatric Surgery, University Children’s Hospital Basel, 4056 Basel, Switzerland
- Department of Clinical Research, University of Basel, 4001 Basel, Switzerland
| | - Olivier Braissant
- Microcalorimetry Unit, Department of Biomedical Engineering, University of Basel, 4001 Basel, Switzerland
| | - Edgar Delgado-Eckert
- Computational Physiology and Biostatistics, Department of Biomedical Engineering at University of Basel and University Children’s Hospital Basel, 4056 Basel, Switzerland
| | - Samer Al-Samir
- Vegetative Physiologie 4220, Zentrum Physiologie, Medizinische Hochschule Hannover, 30625 Hannover, Germany
| | - Rebecca Angresius
- Department of Pediatric Surgery, University Children’s Hospital Basel, 4056 Basel, Switzerland
- Department of Clinical Research, University of Basel, 4001 Basel, Switzerland
| | - Zihe Huo
- Department of Pediatric Surgery, University Children’s Hospital Basel, 4056 Basel, Switzerland
- Department of Clinical Research, University of Basel, 4001 Basel, Switzerland
| | - Stefan Holland-Cunz
- Department of Pediatric Surgery, University Children’s Hospital Basel, 4056 Basel, Switzerland
- Department of Clinical Research, University of Basel, 4001 Basel, Switzerland
| | - Stephanie J. Gros
- Department of Pediatric Surgery, University Children’s Hospital Basel, 4056 Basel, Switzerland
- Correspondence:
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Freeman DE. Fluid therapy in horses: how much is too much? Vet Rec 2021; 188:103-105. [PMID: 34651870 DOI: 10.1002/vetr.164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- David E Freeman
- Large Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, Florida, USA
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Freeman DE. Effect of Feed Intake on Water Consumption in Horses: Relevance to Maintenance Fluid Therapy. Front Vet Sci 2021; 8:626081. [PMID: 33732739 PMCID: PMC7956953 DOI: 10.3389/fvets.2021.626081] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Accepted: 01/19/2021] [Indexed: 11/13/2022] Open
Abstract
Maintenance fluid therapy is challenging in horses that cannot drink or are denied feed and water because of concerns about gastrointestinal tract function and patency. Intravenous fluid delivery to meet water needs based on current recommendations for maintenance requirements were obtained in fed horses and therefore might not apply to horses that are not being fed. This is a critical flaw because of the interdependence between intestinal tract water and extracellular water to support digestion while preserving water balance, a concept explained by the enterosystemic cycle. Because horses drink less when they are not eating and hence have lower water needs than fed horses, maintenance water requirements need to be adjusted accordingly. This article reviews this topic and identifies benefits of adjusting maintenance fluid therapy to meet lower demands from gastrointestinal function, such as reduced volumes, lower cost, avoidance of overhydration.
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Affiliation(s)
- David E. Freeman
- Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL, United States
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4
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Rangan V, Ukleja A. Gastroparesis in the Hospital Setting. Nutr Clin Pract 2020; 36:50-66. [PMID: 33336872 DOI: 10.1002/ncp.10611] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Accepted: 11/04/2020] [Indexed: 12/15/2022] Open
Abstract
Gastroparesis (GP) is commonly seen in hospitalized patients. Refractory vomiting and related dehydration, electrolyte abnormalities, and malnutrition are indications for hospital admission. In addition, tube feeding intolerance is a common sign of gastric dysmotility in critically ill patients. The diagnosis and management of GP in the hospital setting can be quite challenging. Diagnostic tests are often deferred because of patient intolerance of the oral meal for standard scintigraphy or severity of the primary disease. The diagnosis of GP is often established on the basis of clinical scenario and risk factors for gastric motor dysfunction. Medical therapy in GP is directed toward controlling nausea and vomiting by prokinetic and antinausea medications and correcting nutrition risks or treating malnutrition with nutrition therapy. Enteral nutrition is the preferred nutrition intervention for patients with GP. Delayed gastric emptying in critically ill patients has a negative impact on the timely delivery of enteral feeding and meeting the energy and protein goals. Measures to improve gastric tolerance or provide feeding beyond the stomach are often needed, since early enteral nutrition has been an important target of therapy for critically ill patients. This review will address the current understanding of the mechanisms of GP and feeding intolerance in critical illness, diagnostic workup, drug therapies, and interventions to improve the provision of enteral nutrition in hospital settings when gastric dysmotility is present or suspected.
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Affiliation(s)
- Vikram Rangan
- Division of Gastroenterology and Hepatology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Andrew Ukleja
- Division of Gastroenterology and Hepatology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
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Fan CN, Yang SJ, Shih PY, Wang MJ, Fan SZ, Tsai JC, Sun WZ, Liu CM, Yeh YC. Comparing effects of intraoperative fluid and vasopressor infusion on intestinal microcirculation. Sci Rep 2020; 10:19856. [PMID: 33199828 PMCID: PMC7670439 DOI: 10.1038/s41598-020-76983-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2020] [Accepted: 10/27/2020] [Indexed: 11/09/2022] Open
Abstract
Several studies have revealed that vasopressor may be more appropriate for treating intraoperative hypotension and preventing hypervolemia. This study compared the effects of vasopressor infusion and fluid supplementation on intestinal microcirculation during treating intraoperative hypotension. Thirty-two rats were randomly divided into the following four groups: Light Anesthesia group (LA, 0.8-1% isoflurane); Deep Anesthesia group (DA, 1.5-1.8% isoflurane); Fluid DA group (1.5-1.8% isoflurane and fluid supplementation); and Norepinephrine DA group (1.5-1.8% isoflurane and norepinephrine infusion). At 240 min, perfused small vessel density (PSVD) of the mucosa did not differ significantly between the Fluid DA and Norepinephrine DA groups [26.2 (3.2) vs 28.9 (2.5) mm/mm2, P = 0.077], and tissue oxygen saturation of the mucosa was lower in the Fluid DA groups than in the Norepinephrine DA groups [ 48 (7) vs 57 (6) %, P = 0.02]. At 240 min, TSVD and PSVD of the seromuscular layer were higher in the Norepinephrine DA group than in the Fluid DA group. Fluid administration was higher in the Fluid DA group than in the Norepinephrine DA group [66 (25) vs. 9 (5) μL/g, P = 0.001]. Our results showed that norepinephrine can resuscitate intraoperative hypotension related microcirculatory alteration and avoid fluid overload.
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Affiliation(s)
- Chia-Ning Fan
- Department of Anesthesiology, National Taiwan University Hospital, Chung Shan S. Rd, No.7, Taipei, 10002, Taiwan
| | - Szu-Jen Yang
- Department of Anesthesiology, National Taiwan University Hospital, Chung Shan S. Rd, No.7, Taipei, 10002, Taiwan
| | - Po-Yuan Shih
- Department of Anesthesiology, National Taiwan University Hospital, Chung Shan S. Rd, No.7, Taipei, 10002, Taiwan
| | - Ming-Jiuh Wang
- Department of Anesthesiology, National Taiwan University Hospital, Chung Shan S. Rd, No.7, Taipei, 10002, Taiwan
| | - Shou-Zen Fan
- Department of Anesthesiology, National Taiwan University Hospital, Chung Shan S. Rd, No.7, Taipei, 10002, Taiwan
| | - Jui-Chang Tsai
- Institute of Medical Device and Imaging, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Wei-Zen Sun
- Department of Anesthesiology, National Taiwan University Hospital, Chung Shan S. Rd, No.7, Taipei, 10002, Taiwan
| | - Chih-Min Liu
- Department of Anesthesiology, National Taiwan University Hospital, Chung Shan S. Rd, No.7, Taipei, 10002, Taiwan.
| | - Yu-Chang Yeh
- Department of Anesthesiology, National Taiwan University Hospital, Chung Shan S. Rd, No.7, Taipei, 10002, Taiwan.
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York NW, Parker H, Xie Z, Tyus D, Waheed MA, Yan Z, Grange DK, Remedi MS, England SK, Hu H, Nichols CG. Kir6.1- and SUR2-dependent KATP over-activity disrupts intestinal motility in murine models of Cantu Syndrome. JCI Insight 2020; 5:141443. [PMID: 33170808 PMCID: PMC7714409 DOI: 10.1172/jci.insight.141443] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Accepted: 10/28/2020] [Indexed: 11/17/2022] Open
Abstract
Cantύ Syndrome (CS), caused by gain-of-function (GOF) mutations in pore-forming (Kir6.1, KCNJ8) and accessory (SUR2, ABCC9) ATP-sensitive potassium (KATP) channel subunit genes, is frequently accompanied by gastrointestinal (GI) dysmotility, and we describe one CS patient who required an implanted intestinal irrigation system for successful stooling. We used gene-modified mice to assess the underlying KATP channel subunits in gut smooth muscle, and to model the consequences of altered KATP channels in CS gut. We show that Kir6.1/SUR2 subunits underlie smooth muscle KATP channels throughout the small intestine and colon. Knock-in mice, carrying human KCNJ8 and ABCC9 CS mutations in the endogenous loci, exhibit reduced intrinsic contractility throughout the intestine, resulting in death when weaned onto solid food in the most severely affected animals. Death is avoided by weaning onto a liquid gel diet, implicating intestinal insufficiency and bowel impaction as the underlying cause, and GI transit is normalized by treatment with the KATP inhibitor glibenclamide. We thus define the molecular basis of intestinal KATP channel activity, the mechanism by which overactivity results in GI insufficiency, and a viable approach to therapy.
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Affiliation(s)
- Nathaniel W York
- Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, United States of America
| | - Helen Parker
- Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, United States of America
| | - Zili Xie
- Department of Anesthesiology, Washington University School of Medicine, St. Louis, United States of America
| | - David Tyus
- Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, United States of America
| | - Maham A Waheed
- Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, United States of America
| | - Zihan Yan
- Department of Anesthesiology, Washington University School of Medicine, St. Louis, United States of America
| | - Dorothy K Grange
- Divison of Clinical Genetics, Washington University School of Medicine, St. Louis, United States of America
| | - Maria S Remedi
- Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, United States of America
| | - Sarah K England
- Department of Obstetrics and Gynecology, Washington University School of Medicine, St. Louis, United States of America
| | - Hongzhen Hu
- Department of Anesthesiology, Washington University School of Medicine, St. Louis, United States of America
| | - Colin G Nichols
- Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, United States of America
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Luo J, Qian A, Oetjen LK, Yu W, Yang P, Feng J, Xie Z, Liu S, Yin S, Dryn D, Cheng J, Riehl TE, Zholos AV, Stenson WF, Kim BS, Hu H. TRPV4 Channel Signaling in Macrophages Promotes Gastrointestinal Motility via Direct Effects on Smooth Muscle Cells. Immunity 2018; 49:107-119.e4. [PMID: 29958798 DOI: 10.1016/j.immuni.2018.04.021] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Revised: 03/06/2018] [Accepted: 04/18/2018] [Indexed: 01/09/2023]
Abstract
Intestinal macrophages are critical for gastrointestinal (GI) homeostasis, but our understanding of their role in regulating intestinal motility is incomplete. Here, we report that CX3C chemokine receptor 1-expressing muscularis macrophages (MMs) were required to maintain normal GI motility. MMs expressed the transient receptor potential vanilloid 4 (TRPV4) channel, which senses thermal, mechanical, and chemical cues. Selective pharmacologic inhibition of TRPV4 or conditional deletion of TRPV4 from macrophages decreased intestinal motility and was sufficient to reverse the GI hypermotility that is associated with chemotherapy treatment. Mechanistically, stimulation of MMs via TRPV4 promoted the release of prostaglandin E2 and elicited colon contraction in a paracrine manner via prostaglandin E receptor signaling in intestinal smooth muscle cells without input from the enteric nervous system. Collectively, our data identify TRPV4-expressing MMs as an essential component required for maintaining normal GI motility and provide potential drug targets for GI motility disorders.
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Affiliation(s)
- Jialie Luo
- Center for the Study of Itch, Department of Anesthesiology, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Aihua Qian
- Department of Gastroenterology, Ruijin Hospital, Shanghai Jiaotong University, Shanghai 200025, China
| | - Landon K Oetjen
- Division of Dermatology, Department of Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Weihua Yu
- Department of Anatomy, Chongqing Medical University, Chongqing 400016, China
| | - Pu Yang
- Center for the Study of Itch, Department of Anesthesiology, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Jing Feng
- Center for the Study of Itch, Department of Anesthesiology, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Zili Xie
- Center for the Study of Itch, Department of Anesthesiology, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Shenbin Liu
- Center for the Study of Itch, Department of Anesthesiology, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Shijin Yin
- College of Pharmacy, South-Central University for Nationalities, Wuhan, Hubei 430073, China
| | - Dari Dryn
- Department of Biophysics, Institute of Biology, Taras Shevchenko National University of Kyiv, Kyiv 03022, Ukraine
| | - Jizhong Cheng
- Department of Medicine, Baylor College of Medicine, Houston, TX 77030, USA
| | - Terrence E Riehl
- Division of Gastroenterology, Department of Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Alexander V Zholos
- Department of Biophysics, Institute of Biology, Taras Shevchenko National University of Kyiv, Kyiv 03022, Ukraine
| | - William F Stenson
- Division of Gastroenterology, Department of Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Brian S Kim
- Center for the Study of Itch, Department of Anesthesiology, Washington University School of Medicine, St. Louis, MO 63110, USA; Division of Dermatology, Department of Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA; Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO 63110, USA.
| | - Hongzhen Hu
- Center for the Study of Itch, Department of Anesthesiology, Washington University School of Medicine, St. Louis, MO 63110, USA.
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Freeman DE. Fifty years of colic surgery. Equine Vet J 2018; 50:423-435. [DOI: 10.1111/evj.12817] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Revised: 12/05/2017] [Accepted: 01/10/2018] [Indexed: 12/21/2022]
Affiliation(s)
- D. E. Freeman
- Department of Large Animal Clinical Sciences; College of Veterinary Medicine; University of Florida; Gainesville Florida USA
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9
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Affiliation(s)
- D. Freeman
- College of Veterinary Medicine; University of Florida; Gainesville Florida USA
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10
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Raftery AG, Morgan RA, MacFarlane PD. Perioperative trends in plasma colloid osmotic pressure in horses undergoing surgery. J Vet Emerg Crit Care (San Antonio) 2015; 26:93-100. [PMID: 26397385 DOI: 10.1111/vec.12369] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2012] [Revised: 01/31/2014] [Accepted: 07/24/2015] [Indexed: 01/29/2023]
Abstract
OBJECTIVE To compare perioperative trends in plasma colloid osmotic pressure (COP) between horses undergoing orthopedic and colic surgery. DESIGN Prospective clinical study September 2009-January 2011. SETTING Veterinary university teaching hospital. ANIMALS Thirty-three healthy, client-owned horses presenting for orthopedic surgery (non-GI) and 85 client-owned horses presenting for emergency exploratory celiotomy (GI, gastrointestinal). INTERVENTIONS None. MEASUREMENTS Data relating to the horse's parameters on presentation, surgical lesion, post-operative management and survival were extracted from computerized clinical records. Heparinized blood samples were taken on presentation (PreOp, pre-operative), on recovery from anesthesia (T0), at 12 (T12) and 24 (T24) hours post recovery. COP was measured within 4 hours of collection. RESULTS There was no significant difference in PreOp or T0 COP between groups. Both groups had a significant decrease in COP during anesthesia. When compared to their respective pre-operative values, horses in the non-GI group had significantly increased COP at T12, whereas those in the GI group had significantly reduced COP. This trend was continued at T24. Horses in the GI group placed on intravenous crystalloid isotonic fluids post-operatively had a significantly lower COP at T12 and T24. Horses in the GI group that did not survive had significantly lower post-operative COP values at T24. CONCLUSIONS Horses undergoing exploratory celiotomy had significantly lower COP post-operatively than those horses undergoing orthopedic surgery. This difference was more marked in those horses receiving isotonic crystalloid intravenous fluid therapy post-operatively and in those that did not survive to discharge. In the non-GI group an increase in COP post-operatively was common.
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Affiliation(s)
- Alexandra G Raftery
- Philip Leverhulme Equine Hospital, University of Liverpool, Neston, CH64 7TE, UK
| | - Ruth A Morgan
- Philip Leverhulme Equine Hospital, University of Liverpool, Neston, CH64 7TE, UK
| | - Paul D MacFarlane
- Philip Leverhulme Equine Hospital, University of Liverpool, Neston, CH64 7TE, UK
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11
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Freeman DE, Schaeffer DJ, Cleary OB. Long-term survival in horses with strangulating obstruction of the small intestine managed without resection. Equine Vet J 2014; 46:711-7. [PMID: 24237247 DOI: 10.1111/evj.12216] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2013] [Accepted: 11/03/2013] [Indexed: 10/26/2022]
Abstract
REASONS FOR PERFORMING STUDY Although many studies have described results after small intestinal resection and anastomosis in horses, few have described the outcome in horses with strangulating lesions managed without resection. OBJECTIVES To examine short- and long-term recoveries in horses with strangulated small intestine that was judged to be viable during surgery and not resected. STUDY DESIGN Retrospective analysis of case records. METHODS Data were reviewed from all cases (35 horses) with colic caused by small intestinal strangulation that underwent surgery between 1996 and 2011 at 2 university hospitals and that were managed without resection by 2 surgeons who used a clinical grading system to assess intestinal viability. Kaplan-Meier analyses were used to examine long-term survival. RESULTS Survival to discharge from the hospital was 100%, and post operative complications developed in 11 horses (31%). Three horses (8.6%) required repeat coeliotomy because of persistent pain with or without reflux, and they responded favourably to decompression of distended intestine. Ten horses died after discharge, and 12 were still alive at follow-up from 20 to 192 months after surgery. Information was available on 13 horses after discharge, but these were eventually lost to follow-up. Kaplan-Meier analyses yielded a median survival probability of 120 months. CONCLUSIONS A subjective method of assessing small intestinal viability in strangulated small intestine in horses, as used in this study, could reduce the need for resection and anastomosis, with the associated complications and costs. Also, the favourable post operative course in these horses provides strong evidence that early referral could avoid the need for resection and improve survival. The numbers of horses with the most severe changes that were not resected were too small to allow a conclusion that such segments should be left in place, and additional criteria might be needed to guide that decision in such cases.
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Affiliation(s)
- D E Freeman
- Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, USA
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12
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Chang M, Yu J, Zhang L, Guo G, Zhang W, Chen J, Chen P, Li Y. A new model for the study of secondary intra-abdominal hypertension in rats. J Surg Res 2013; 187:244-51. [PMID: 24209805 DOI: 10.1016/j.jss.2013.09.038] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2013] [Revised: 09/25/2013] [Accepted: 09/26/2013] [Indexed: 10/26/2022]
Abstract
BACKGROUND To build a new and appropriate model of secondary intra-abdominal hypertension (IAH) in rats. METHODS A total of 32 female Sprague-Dawley rats were randomized into four groups. Group I: the rats were hemorrhaged to a mean arterial pressure (MAP) of 40 mm Hg for 1 h and portal hypertension was induced by partial ligation of the portal vein 1 h later; Group II: after inducing portal hypertension, hemorrhagic shock of MAP of 40 mm Hg was induced and maintained for 1 h; Group III: after inducing portal hypertension, hemorrhagic shock of MAP of 40 mm Hg was induced and maintained for 2 h; Group IV: after inducing portal hypertension, hemorrhagic shock of MAP of 40 mm Hg was induced and maintained for 2 h, and a specially designed abdominal restraint device was used. After these procedures, respectively, the collected blood was reinfused and lactated Ringer solution was continuously infused until the secondary IAH model was established. RESULTS No models were built in Groups I, II, and III. One rat died in Group IV after portal vein ligation, and all the remaining rats successfully developed IAH; the success rate was 87.5%. During the resuscitation period, the average time was 5.26 ± 0.59 h and the average total infusion volume was 665.5 ± 86.04 mL/kg. CONCLUSION A rat model of secondary IAH was successfully established by resuscitation after a combination of inducing portal hypertension, hemorrhaging to a MAP of 40 mm Hg for 2 h, and using an abdominal restraint device. All these criteria mimic key etiological factors for the development of secondary IAH.
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Affiliation(s)
- Mingtao Chang
- Trauma Center, State Key Laboratory of Trauma, Burns and Combined Injury, Institute of Surgery Research, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Jian Yu
- Trauma Center, State Key Laboratory of Trauma, Burns and Combined Injury, Institute of Surgery Research, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Lianyang Zhang
- Trauma Center, State Key Laboratory of Trauma, Burns and Combined Injury, Institute of Surgery Research, Daping Hospital, Third Military Medical University, Chongqing, China.
| | - Guangkuo Guo
- Trauma Center, State Key Laboratory of Trauma, Burns and Combined Injury, Institute of Surgery Research, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Weiguo Zhang
- Trauma Center, State Key Laboratory of Trauma, Burns and Combined Injury, Institute of Surgery Research, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Jinghua Chen
- Trauma Center, State Key Laboratory of Trauma, Burns and Combined Injury, Institute of Surgery Research, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Peng Chen
- Trauma Center, State Key Laboratory of Trauma, Burns and Combined Injury, Institute of Surgery Research, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Yang Li
- Trauma Center, State Key Laboratory of Trauma, Burns and Combined Injury, Institute of Surgery Research, Daping Hospital, Third Military Medical University, Chongqing, China
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