Technical Aspects in Studying Peritoneal Morphology in Animal Models of Peritoneal Dialysis

2009 ◽  
Vol 29 (2_suppl) ◽  
pp. 40-44 ◽  
Author(s):  
Soner Duman ◽  
Sait Şen
Keyword(s):  
Peritoneal Dialysis ◽  
Abdominal Wall ◽  
Histological Examination ◽  
Anterior Abdominal Wall ◽  
Anterior Wall ◽  
Abdominal Muscle ◽  
Tissue Samples ◽  
Peritoneal Tissue ◽  
Significant Difference ◽  
Peritonitis Model

Objective Peritoneal biopsies are considered useful for gaining a better understanding of the pathophysiology of the peritoneum during experimental peritoneal dialysis (PD). Different peritoneal tissue samples (i.e., abdominal wall, liver, diaphragm, intestine, and omentum) may be used, but there can be artifacts due to peritoneal tissue processing. Aim To investigate differences in peritoneal membranes from different parts of the peritoneum, and also 2 different fixatives, in experimental PD and a peritonitis model in rats. Methods Peritoneal tissues from the anterior abdominal wall, liver, omentum, and intestine were taken from each of 3 groups of animals: sham, experimental PD, and peritonitis model. Tissue samples were immediately fixed with 4% formaldehyde and routinely processed for histological examination. Two parietal peritoneal tissue samples according to longitudinal and horizontal sections of anterior wall inner abdominal muscle were also taken. All samples were immediately fixed with 4% formaldehyde and B5 fixative (B5), and then routinely processed for histological examination. Results In all groups, histopathological findings were more commonly seen in the abdominal wall samples. There were no changes observed in peritoneal membranes other than those of anterior abdominal wall samples from both sham and PD model rats. However, there was a significant difference between anterior and posterior facets of liver in the peritonitis model. Furthermore, the antimesenteric site of intestinal peritoneum was less affected than the mesenteric site. There were no significant histopathological differences between B5 and 4% formaldehyde fixation ( p > 0.05). Conclusion Our results suggest that peritoneum obtained from the anterior abdominal wall is the most affected area and therefore the most suitable site to investigate peritoneal changes in the experimental rat PD model. There were no significant differences between fixation with 4% formaldehyde and B5 solution. Abdominal wall samples should be of the same direction of inner abdominal muscle, that is, horizontal sectioning should be used for measurements of the submesothelial area.

Change in the Transport of Uric Acid under the Influence of Pyrazinoic Acid: In Vitro Studies with Human and Rabbit Peritoneum

1989 ◽  
Vol 9 (4) ◽  
pp. 303-306 ◽  
Author(s):  
Krystyna Czyźewska ◽  
Alicja Grzegorzewska ◽  
Jan Knapowski
Keyword(s):  
Uric Acid ◽  
Peritoneal Dialysis ◽  
Comparative Analysis ◽  
Abdominal Wall ◽  
Experimental Model ◽  
Anterior Abdominal Wall ◽  
Bidirectional Transport ◽  
Abdominal Operations ◽  
Pyrazinoic Acid

Bidirectional transport of uric acid (UA) through human and rabbit peritoneum, and its change under the influence of pyrazinoic acid (PA) was investigated in vitro. Fragments of parietal peritoneum were taken from the region of anterior abdominal wall from rabbits (the animal series) and from patients undergoing abdominal operations (the human series). Under control conditions, higher values of the UA transport were found in the rabbit peritoneum in comparison with the human peritoneum, but in both series it was maintained at a constant level throughout the experiment lasting 120 min. In rabbit as well as in human peritoneum it was found that PA depressed about 50% of the UA transport from the interstitial to the mesothelial side, leaving the opposite direction intact. The results obtained in vitro are in agreement with previous observations in a patient undergoing peritoneal dialysis that showed decreased peritoneal UA excretion evoked by pyrazinamide. The comparative analysis proves the rabbit peritoneum to be a good experimental model for further investigations of peritoneal urate transport in man.

scholarly journals Healing of abdominal wall aponeurosis of rats after incision with either cold scalpel or electrocautery

2007 ◽  
Vol 22 (suppl 1) ◽  
pp. 12-15 ◽  
Author(s):  
Ademar Garcia ◽  
José Eduardo Aguilar-Nascimento ◽  
Eduardo Mulinari Darold ◽  
Rodolfo Edson de Franco Pimentel ◽  
Eloísa Almeida Curvo ◽  
...  
Keyword(s):  
Abdominal Wall ◽  
Histological Study ◽  
Control Group ◽  
Hydroxyproline Content ◽  
Tissue Samples ◽  
Significant Difference ◽  
Experimental Group

PURPOSE: To compare the healing of abdominal wall aponeurosis of rats after incision with either cold scalpel or electrocautery. METHODS: Twelve male adults Wistar inbreed rats weightin 258-362g entered the experiment. They were randomly divided in two groups, control group (N= 6) and experimental group (N= 6). All animals underwent anesthesia followed abdominal wall incision with either cold scalpel (controls) or electrocautery (experimental group). The animals were killed on the 10th day and necropsied. Tissue samples containig the abdominal wall aponeurosis were sent for both histological study and hydroxyproline content assay. RESULTS: The histological study showed no significant difference between the two groups. Hydroxiproline content in experimenral group (128,56 [78,98-198,92] µg /100m) was not significantly different from control group (140,27 [116,20-166,59] mg /100ml; p = 0.53). CONCLUSION: Healing of abdominal wall after dieresis with either cold scalpel or electrocautery are equivalent and do not differ.

How safe is the use of prosthetic materials in the repair of abdominal-wall defects in malnourished subjects?

Open Medicine ◽  
2009 ◽  
Vol 4 (3) ◽  
pp. 331-336 ◽  
Author(s):  
Mehmet Karahan ◽  
Hakan Kulacoglu ◽  
Duray Seker ◽  
Zafer Ergul ◽  
Aysel Kiziltay ◽  
...  
Keyword(s):  
Wound Healing ◽  
Abdominal Wall ◽  
Polypropylene Mesh ◽  
Histopathological Examination ◽  
Abdominal Wall Defect ◽  
Infectious Complications ◽  
Abdominal Wall Defects ◽  
Tissue Samples ◽  
Significant Difference ◽  
Histopathological Studies

AbstractIncisional hernias and abdominal-wall defects consume large amounts of healthcare resources. Use of mesh is effective in treatment of these disorders and can decrease the rate of recurrence. This experimental study focused on the safety of mesh use in the setting of malnutrition, a condition that impairs wound healing. Rats were divided into two groups: normally fed and food-restricted. An abdominal-wall defect, 2 by 2 cm, was covered with polypropylene mesh, 2.5 by 2.5 cm. After sacrifice of the rats at the 21st and 60th days, tissue samples were sent for tensiometric and histopathological studies. No significant difference in infectious complications was observed between the two groups. Tensiometry revealed no significant differences between the groups. On histopathological examination, the only difference noted was in the vascularization scores of normally fed rats. For malnourished subjects that survived after surgery, the use of polypropylene mesh appeared safe in the closure of abdominal-wall defects, with no increase in infection rate and satisfactory wound healing.

Clearance of Tracer Albumin from Peritoneal Cavity to Plasma at Low Intraperitoneal Volumes and Hydrostatic Pressures

1998 ◽  
Vol 18 (5) ◽  
pp. 497-504 ◽  
Author(s):  
Qing Zhu ◽  
Ola Carlsson ◽  
Bengt Rippe
Keyword(s):  
Peritoneal Dialysis ◽  
Peritoneal Cavity ◽  
Fluid Volume ◽  
Free Fluid ◽  
Annual Conference ◽  
Lymphatic Absorption ◽  
Tissue Samples ◽  
Essentially Normal ◽  
Peritoneal Tissue ◽  
Tracer Distribution

Objective To assess the clearance of radiolabeled tracer albumin (RISA) from peritoneal cavity to plasma (CI → P) in rats under essentially “normal” conditions, that is, when intraperitoneal hydrostatic pressure (IPP) is subatmospheric and the intraperitoneal (IP) “free” fluid volume (IPV) is low. Methods A volume of 0.3 mL of RISA was injected IP into anesthetized Wistar rats (wt = 300 g) when the IPV was approximately 2 mL (normal) or the IPV was approximately 10 mL, and IPP was either -1.8 mmHg (normal) or +1.5 mmHg (produced by an external cuff). Plasma samples (25 μL) were obtained repeatedly during the dwell, which lasted 30 300 min, after which the peritoneal cavity was opened to recover the IPV and residuallP RISA activity. The CI → P was assessed as the mass transfer of RISA into plasma, occurring per unit time,-divided by the calculated mean IP RISA concentration (CD). The interstitial RISA space was measured as the mass of RISA accumulated, per unit tissue weight, in peritoneal tissue samples divided by the CD. Results A markedly lower CI → P (2.47 ± 0.67 μL/min), as well as total RISA clearance out of the peritoneal cavity (CI), was found under “normal” conditions (an IPV of approximately 2 mL and an IPP of approximately -1.8 mmHg) compared to the situation during peritoneal dialysis (an IPV of approximately 20 mL and an IPP of +1 mmHg). Furthermore, the interstitial RISA space increased linearly over time even at negative IPPs and at an unchanging peritoneal interstitial fluid volume. At a low (normal) IPV the CI → P did not increase significantly with elevating IPP, and increased only marginally when tracer distribution was improved by artificial vibration of the rats. However the CI → P increased when larger volumes were infused to increase the totallPV. Conclusions It is concluded that the CI → P and CI at low IPPs and IPVs are not as high as during peritoneal dialysis. Increases in CI → P were, however, coupled to increases in IPV. This highlights the importance of the IPV per se and of a sufficient IP tracer distribution for direct lymphatic absorption to be efficient. This study was presented in part at the XVIth Annual Conference on Peritoneal Dialysis, Denver, Colorado, U.S.A., 1997 (33).

THE ROLE OF LASER AND ULTRASONIC DOPPLER FLOWMETRY IN THE CORRECTION OF COSMETIC DEFECTS OF THE ANTERIOR ABDOMINAL WALL AND PREVENTION OF COMPLICATIONS

2021 ◽  
Vol 74 (7) ◽  
pp. 1605-1611
Author(s):  
Orest V. Panchuk ◽  
Yaroslav M. Susak ◽  
Ievgen G. Donets ◽  
Pavlo l. Byck ◽  
Olena F. Panchuk ◽  
...  
Keyword(s):  
Blood Flow ◽  
Abdominal Wall ◽  
Anterior Abdominal Wall ◽  
Main Group ◽  
Control Group ◽  
Entire Study ◽  
Doppler Flowmetry ◽  
Significant Difference ◽  
Simultaneous Operations ◽  
Ultrasonic Doppler Flowmetry

The aim: Of work is to determine changes in blood flow in the vessels of the anterior abdominal wall that occur after plastic surgeries in order to improve the results of operations and to develop new methods for the prevention of complications. Materials and methods: The study was conducted in 132 patients. Patients were divided into 2 groups: main group 64 and control group 68 patients. Main group has patients who underwent abdominoplasty in combination with liposuction; control group has patients who underwent abdominoplasty without liposuction. In both groups we make different simultaneous operations. Laser Doppler Flowmetry and Ultrasonic Doppler Flowmetry were performed to determine the blood flow indices in the flaps. Results: Liposuction volumes averaged 3.57 ± 0.74 liters of lipoaspirate. In the main group there were totaly 4 complications, in the control group complications developed in 9 patients. Comparing daily indicators between the two groups, no statistically significant difference in the dynamics of MI changes was found during the entire study period (p = 0.767). Increase in caliber of vessels, on average, from 1.55 ± 0.8 mm in the preoperative period to 1.68 ± 0.75 mm on the 14th day of the postoperative period was statistically significant (p < 0.05). Conclusions: The combination of abdominoplasty with liposuction and simultaneous operations does not lead to greater development of complications and allows to achieve good aesthetic results.

scholarly journals Age-related structural changes in the myenteric nervous plexus ganglion along the anterior wall of the proximal human duodenum: A morphometric analysis

2013 ◽  
Vol 70 (2) ◽  
pp. 177-181
Author(s):  
Predrag Mandic ◽  
Snezana Lestarevic ◽  
Tatjana Filipovic ◽  
Natasa Djukic-Macut ◽  
Milena Saranovic
Keyword(s):  
Morphometric Analysis ◽  
Structural Changes ◽  
Age Groups ◽  
Anterior Wall ◽  
Test System ◽  
Cresyl Violet ◽  
Tissue Samples ◽  
Age Related ◽  
Significant Difference ◽  
Myenteric Ganglia

Background/Aim. Aging is one of the most complex biological processes which probably affect structure and function of the enteric nerve system. However, there is not much available information on this topic, particularly in humans. The aim of this study was to investigate the influence of aging on the structure of the myenteric ganglia in the anterior wall of the human proximal duodenum. Methods. We examined the myenteric ganglia in the proximal duodenal anterior wall specimens obtained from 30 cadaver persons aged from 20 to 84 years. Tissue samples were classified into three age groups: 20-44, 45-64 and 65-84 years. After standard histological preparation, specimens were stained with HE, Cresyl Violet and AgNO3. Morphometric analysis of all the specimens, using a multipurpose test system M42, was performed. The data were subjected to the ttest. Results. The myenteric ganglia of very old humans contains an empty space, i.e. the respective parts of ganglia show a decreased number of neuron as compared to younger population. The average number of neuron per cm2 of the duodenum in the youngest people (20-44 years) was 69,370 ? 1,750.00, in the people aged 45-64 years 69,211 ? 1,573.33, and in the oldest persons (65-84 years) 57,951 ? 1,291.52. The loss of neurons in the oldest persons was 16.46%. The applied statistic test demonstrated a significant difference between the observed groups (p < 0.0001). Conclusion. Aging does not induce changes in size and surface of neurons in the ganglia, but it decreases the number of neurons. The nerve structures in the elderly are partly emptied of bodies of nerve cells (?empty ganglions?), which indicates the existence of changed myenteric ganglia in the duodenum. These changes could be related to the duodenum motility disorder associated with aging.

scholarly journals Comparative study of the healing process of the aponeurosis of the anterior abdominal wall of rats after wound closure using 3-0 nylon suture and N-butil-2-cyanoacrylate tissue adhesive

2008 ◽  
Vol 23 (4) ◽  
pp. 352-363 ◽  
Author(s):  
Carlos Augusto Marques Batista ◽  
Ramiro Colleoni Neto ◽  
Gaspar de Jesus Lopes Filho
Keyword(s):  
Tensile Strength ◽  
Abdominal Wall ◽  
Wound Closure ◽  
Proportional Hazards ◽  
Proportional Hazards Model ◽  
Anterior Abdominal Wall ◽  
Healing Process ◽  
Tissue Adhesive ◽  
Nylon Suture ◽  
Significant Difference

PURPOSE: To investigate the healing process of the aponeurosis of the anterior abdominal wall of rats, comparing two different materials for wound closure: 3-0 nylon suture and tissue adhesive N-butyl-2-cyanoacrylate. METHODS: Forty-four Wistar rats were randomly divided into four groups according to the type of material used (suture or adhesive) and the number of days until reoperation (seven or 14 days). After a 4 cm incision in the aponeurosis, 22 rats underwent wound closure using 3-0 nylon suture and the other 22, the tissue adhesive. After seven days, 11 rats from each group were weighed again, submitted to reoperation and then euthanized. The same procedure was carried out after 14 days with the remaining rats. The surgical wound was macroscopically examined, the tensile strength was measured and the tissue edges were histologically examined. The statistical analysis was performed using analysis of variance and Cox's proportional hazards model. Significance level was set at p < 0.05. RESULTS: The animals lost on average 20 g over the period between the two operations. Wound closure was faster using the tissue adhesive. Only one animal, from the tissue adhesive group, had a small abscess with wound dehiscence. With regard to tensile strength, the best results were obtained with the tissue adhesive 14 days after the first surgery. The results of the histological examination showed no significant difference between groups. CONCLUSIONS: Upon morphological evaluation, the two types of material analyzed in this study (3-0 nylon suture and N-butyl-2-cyanoacrylate, a tissue adhesive) were not significantly different with regard to the healing process of the aponeurosis of the anterior abdominal wall of rats. Wound closure using the tissue adhesive was faster. Higher tensile strength was observed in the tissue adhesive group 14 days after the first surgery.

scholarly journals Experimental study comparing the tensile strength of different surgical meshes following aponeurotic-muscle deformity synthesis on Wistar rats

2007 ◽  
Vol 22 (1) ◽  
pp. 47-52 ◽  
Author(s):  
Armando José d'Acampora ◽  
Darlan de Medeiros Kestering ◽  
Marly da Silveira Soldi ◽  
Lucas Félix Rossi
Keyword(s):  
Tensile Strength ◽  
Abdominal Wall ◽  
Mechanical Test ◽  
Abdominal Muscle ◽  
Abdominal Muscles ◽  
Test Machine ◽  
Experimental Conditions ◽  
Average Force ◽  
Surgical Meshes ◽  
Significant Difference

PURPOSE: To assess the tensile strength of polypropylene and polypropylene associated with polyglactin meshes (Vypro II® - Ethicon®, Somerville, NJ, USA) in a situation of partial separation of abdominal muscle aponeurosis on rats. METHODS: Thirty rats were used of the Wistar strain, which were randomized into two groups of 15 specimens each. In both groups an aponeurotic-muscle deformity was created on the abdominal wall measuring 3.0 x 1.0 cm, which was closed with polypropylene mesh (polypropylene group) or Vypro® mesh (vypro group). After 28 days the rats underwent euthanasia and an area was removed from the abdominal wall with which a strip was made measuring 2.0 cm in length and 6.0 cm in width comprising the abdominal muscles with the implanted mesh. This sample was placed in a mechanical test machine in which a constant force was applied contrary to the tissue strips. Maximum force expressed in Newton was considered until full rupture of the sample occurred. The non-parametric Kruskal - Wallis test was used for statistical analysis admitting p<0.05. RESULTS: Out of the thirty animals, there were two deaths in the vypro group and one unit in the polypropylene group was lost. One animal in the polypropylene group developed hernia during the study and another one developed granuloma of the abdominal wall. All animals in both groups developed epiplon adherence to the mesh. The average force was 48.08 N for the polypropylene group and 45.32 for the vypro® group. CONCLUSION: In these experimental conditions it could be observed that there is no statistically significant difference in the rupture force of the polypropylene and Vypro® meshes (p=0.54).

scholarly journals Erythrocytes as Volume Markers in Experimental PD Show that Albumin Transport in the Extracellular Space Depends on PD Fluid Osmolarity

2016 ◽  
Vol 36 (3) ◽  
pp. 247-256 ◽  
Author(s):  
Magnus Braide ◽  
Dick Delbro ◽  
Jacek Waniewski
Keyword(s):  
Peritoneal Dialysis ◽  
Bovine Serum Albumin ◽  
Kinetic Data ◽  
Abdominal Muscle ◽  
Distribution Volume ◽  
Surrounding Tissue ◽  
Strongly Correlated ◽  
Edema Formation ◽  
Peritoneal Tissue ◽  
The Difference

Background Macromolecules, when used as intraperitoneal volume markers, have the disadvantage of leaking into the surrounding tissue. Therefore, 51Cr-labeled erythrocytes were evaluated as markers of intraperitoneal volume and used in combination with 125I-labeled bovine serum albumin to study albumin transport into peritoneal tissues in a rat model of peritoneal dialysis (PD). Methods Single dwells of 20 mL of lactate-buffered filter-sterilized PD fluid at glucose concentrations of 0.5%, 2.5%, and 3.9% were performed for 1 or 4 hours. Tissue biopsies from abdominal muscle, diaphragm, liver, and intestine, and blood and dialysate samples, were analyzed for radioactivity. Results The dialysate distribution volume of labeled erythrocytes, measured after correction for lymphatic clearance to blood, was strongly correlated with, but constantly 3.3 mL larger than, drained volumes. Erythrocyte activity of rinsed peritoneal tissue biopsies corresponded to only 1 mL of dialysate, supporting our utilization of erythrocytes as markers of intraperitoneal volume. The difference between the distribution volumes of albumin and erythrocytes was analyzed to represent the albumin loss into the peritoneal tissues, which increased rapidly during the first few minutes of the dwell and then leveled out at 2.5 mL. It resumed when osmotic ultrafiltration turned into reabsorption and, at the end of the dwell, it was significantly lower for the highest osmolarity PD fluid (3.9% glucose). Biopsy data showed the lowest albumin accumulation and edema formation in abdominal muscle for the 3.9% fluid. Conclusion Labeled erythrocytes are acceptable markers of intraperitoneal volume and, combined with labeled albumin, provided novel kinetic data on albumin transport in peritoneal tissues.

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