ABSTRACT
Objective To investigate the effect of laser‐doppler flowmetry (LDF) in the evaluation of established canine spi‐nal cord injury(SCI) model .Methods Totally 15 beagle dogs were randomly divided into the group A ,B and C .Through the im‐proved numerical control SCI apparatus ,different impacts and compression time were adopted to establish the different acute SCI models .The group A was 1 .2 m/s+5 mm+5 mm+15 mns ,the group B was 1 .2 m/s+5 mm+5 mm+10 mns ,while the group C wastakenasthecontrolgroup.LDFwasusedtomeasurethespinalcordbloodflow(SCBF)chart,thepathologicchangewasevalu‐ated by measuring the spinal cord necrosis area .Results The SCBF chart in 3 groups measured by LDF showed that the decrease of SCBF in the group A was most obvious ,the injury degree in the group A was more severe than those in the group B and C ,the difference was statistically significant(P<0 .05) .The motor evoked potential displayed that the decrease degree of SCBF was close‐ly related with the prognosis and motion function .Conclusion LDF could effectively judge the degree of spinal injury and SCBF sit‐uation ,which has a good application prospect in animal experiments and clinical field .
ABSTRACT
OBJECTIVE: This study describes a method for inducing spinal cord injuries in dogs by using balloon catheters via laminectomy and the subsequent changes in the electrophysiological response. METHODS: Female Beagle (Orient Bio, Seongnam, Korea) dogs weighing 10 kg at the time of injury were used. Under inhalation anesthesia, a posterior midline approach laminectomy was performed. A silicone balloon catheter (size 6 Fr; Sewoon Medical, Cheonan, Korea) was then inserted into the vertebral canal at the center of T10. The balloon was inflated to the maximum volume for 1, 2, or 3 days. Open field testing was performed for evaluating motor functions of the hindlimbs. Motor evoked potentials (MEPs) induced by electrical and magnetic stimulation were recorded before and after spinal cord injury. RESULTS: Open field testing yielded locomotor scores of 0 or 1 for dogs subjected to compression for 3 days. These dogs showed no obvious improvement throughout the observation period, and the tonus of their hindlimbs was flaccid. In contrast, motor functions of dogs that had experienced compression for 1 or 2 days were variable, and all dogs showed spastic tonus in their hindlimbs. In dogs subjected to after compression for 3 days, electrically stimulated MEPs for the hindlimbs showed a significant amplitude reduction. Further, hindlimb movements were not evoked by magnetic stimulation of the cervical spine and vertex area. CONCLUSION: Compression for 3 days with a balloon catheter is a safe, reproducible, and reliable method for evaluating electrophysiological changes in a dog model of complete spinal cord injury.
Subject(s)
Animals , Dogs , Female , Humans , Anesthesia, Inhalation , Catheters , Evoked Potentials, Motor , Hindlimb , Laminectomy , Muscle Spasticity , Silicones , Spinal Cord Injuries , SpineABSTRACT
Various energy devices had been used in thyroid surgery. Aim of study is to develop canine model for recurrent laryngeal nerve injury by harmonic scalpel and to evaluate feasibility of using this model for evaluating the safety use of harmonic scalpel during thyroid surgery. Nine dogs were divided into 3 groups according to distance between harmonic scalpel application and recurrent laryngeal nerve; group 1 (1 mm), 2 (2 mm), and 3 (3 mm). Vocal cord function was assessed pre- and postoperatively using video laryngoscopy. Harmonic scalpel was applied adjacent to left recurrent laryngeal nerve and, two weeks later, right recurrent laryngeal nerve at assigned distances. Recurrent laryngeal nerves were evaluated for subacute and acute morphologic changes. Laryngoscopy demonstrated 3 abnormal vocal cords in group 1, 1 in group 2, and no in group 3 (P=0.020). Subacute histologic changes were observed in nerves with abnormal function. Acute histologic changes were observed 5/8 (62.5%) in group 1, 1/7 (14.3%) in group 2, and not in group 3. We developed canine model for recurrent laryngeal injury. The functional outcomes matched with the histologic changes. These warrant further study to determine the safety margin for energy device in vicinity of recurrent laryngeal nerve.
Subject(s)
Animals , Dogs , Laryngoscopy , Recurrent Laryngeal Nerve , Recurrent Laryngeal Nerve Injuries , Thyroid Gland , Vocal CordsABSTRACT
Calbindin-D9k (CaBP-9k) is a cytosolic calcium-binding protein expressed in tissues in the intestine, uterus, placenta, kidney, pituitary gland and bone. Its exact function is unknown, but it is considered to regulate intracytoplasmic concentration and transport of free ions (Ca2+). CaBP-9k protein is involved in intestinal calcium absorption in the intestine and in the regulation of myometrial activity by intracellular calcium in the uterus. Renal CaBP-9k protein is expressed at the site of calcium re-absorption in the kidney and expressed in distal convoluted tubules, where it is thought to facilitate calcium re-absorption. Expression of the CaBP-9k gene has been explored in most mammalians except in a canine model. Presently, we elucidated the expression of CaBP-9k mRNA and protein in the duodenum, kidney and uterus in a canine model involving two adult (2.5-year-old) female beagles. To collect tissues, the dogs were euthanized and then the abdominal cavity was exposed by midline incision. The proximal duodenum, cortex of kidney and uterine horn were collected. Expression of CaBP-9k mRNA was confirmed by reverse transcription-polymerase chain reaction (RT-PCR) and real-time PCR. CaBP-9k protein expression and localization were ascertained by Western blot analysis and immunohistochemistry, respectively. CaBP-9k mRNA was detected in the duodenum, but not in the kidney and uterus. Its protein was expressed only in the enterocytes of the duodenum. Taken together, the results indicate that CaBP-9k mRNA and protein are highly expressed in the enterocytes of the duodenum of a canine model, consistent with findings in other mammalian species.
Subject(s)
Animals , Female , Blotting, Western/veterinary , S100 Calcium Binding Protein G/biosynthesis , Dogs/physiology , Duodenum/physiology , Immunohistochemistry/veterinary , Kidney/physiology , RNA, Messenger/biosynthesis , Reverse Transcriptase Polymerase Chain Reaction/veterinary , Transcription, Genetic , Uterus/physiologyABSTRACT
Objective To assess the efficacy and safety of a newly-designed temporary covered cardia stent for the treatment of achalasia in canine models and to investigate the histopathological changes at different points of follow-up time after the stent was removed. Methods The canine achalasia model was created by injecting benzyl-dimethyl-tetradecyl ammonium chloride (BAC) circumferentially into the lower esophageal sphincter (LES) of the dogs. Twenty-four dogs with achalasia were randomly and equally divided into two groups with 12 dogs in each group:control group (using routine esophageal stents) and study group (using newly-designed temporary covered cardia stents). Under fluoroscopic guidance stents were implanted in the esophagus and were taken away from the esophagus 4 days after stent insertion in experimental dogs of both groups. LES pressures and timed barium esophagography (TBE) were performed in all dogs before and immediately after the stenting procedure,as well as at one week,3 and 6 months after the stent was removed. Every three dogs were sacrificed each time at one week,3 and 6 months after the stent was removed. The esophageal cardia was excised and sent for pathological examination. Results All animals well tolerated the stent insertion / removal and the follow-up procedures. No severe complications such as esophageal perforation occurred. Comparison between two groups showed that stent migration occurrence was much lower in study group (n = 1) than that in control group (n = 5). The reduction of LES pressures in study group was more significant in comparison with control group (at 6-month follow-up,P = 0.027). The difference in barium column product (height ? width) between 0-min and 5-min TBE was statistically significant in study group (at 3-month follow-up,P = 0.009). Integrated analysis of multi-comparison for LES pressures among subgroups of each group revealed that the dogs in study group exhibited better outcomes than the dogs in control group. Both proliferating cell nuclear antigen (PCNA) and ?-smooth muscle actin (?-SMA) immuno-staining revealed that the inflammatory reaction reached its peak at 1-month follow-up. Trichrome staining indicated that the collagenous fiber proliferating index inclined to be stable at 3-month follow-up. Conclusion In treating achalasia in canine models the newly-designed temporary covered cardia stent is superior to the routine esophageal stent in respect of safety and efficacy.