Laparoscopic partial pancreatectomy of the left limb using a harmonic scalpel in nine cats.

OBJECTIVE: To describe a laparoscopic technique and outcome for partial pancreatectomy in cats. STUDY DESIGN: Prospective cohort study. ANIMALS: Nine cats. METHODS: Laparoscopic pancreatectomy was performed using a single incision laparoscopic surgery port and an additional 5.5 mm port. The left pancreatic limb was dissected, sealed and divided at the level of the splenic vein insertion to the portal vein using a harmonic device. Surgical time and complications were recorded. The weight and length of the resected pancreatic limb was recorded. Pre- and postoperative trypsin-like immunoreactivity (TLI), pancreatic lipase immunoreactivity (PLI), and hemoglobin A1C were documented. RESULTS: Laparoscopic partial pancreatectomy was performed successfully in all cats. One grade 1 intraoperative complication occurred (1/9; 11%) resulting in minor hemorrhage from a caudal splenic vein branch. A grade 2 postoperative complication occurred within 3 days after surgery in one cat (1/9; 11%), involving localized, sterile peritonitis in the region of the pancreatic angle. Signs resolved with conservative management. No cats exhibited signs of pancreatitis postoperatively. Long-term, mean TLI decreased by 37% ± 38% (p = .03) following partial pancreatectomy, while PLI and A1C were unchanged. All cats were alive and clinically well at last follow-up 250 to 446 days following surgery. CONCLUSIONS: Laparoscopic partial pancreatectomy using a harmonic device is effective in cats, and offers a minimally-invasive alternative to open surgical pancreatectomy techniques. Laparoscopic pancreatectomy of the left limb results in adequate exocrine and endocrine function in the long-term.

Use of near-infrared fluorescence angiography with indocyanine green to evaluate direct cutaneous arteries used for canine axial pattern flaps.

OBJECTIVE: To describe the use of near-infrared angiography (NIRFA) to identify the vascularization of three canine axial pattern flaps (APFs) omocervical (OMO), thoracodorsal (THO), and caudal superficial epigastric (CSE); to establish a vascular fluorescence pattern (VFP) grading system; and to evaluate the effect of NIRFA on surgeon flap dimension planning compared to traditional landmark palpation (LP) and visualization assessments. STUDY DESIGN: Experimental study. ANIMALS: A total of 15 healthy, client-owned dogs. METHODS: Dogs were sedated and flap sites were clipped. LP-based margins were drawn and preinjection images were recorded. Indocyanine green (ICG) was administered and VFP images were recorded. VFP scores were determined by five surgeons. Margin alterations were performed based on NIRFA-ICG images. Altered measurements were compared between LP and NIRFA-ICG images. RESULTS: Vascularization of the CSE flap was most visible with NIRFA with VFP scores 4/4 for 13/15 dogs. Intersurgeon agreement for VFP grades was poorest for THO (ICC = 0.35) and intermediate for OMO (ICC = 0.49) flaps. Surgeons were more likely to adjust dimensions for CSE flaps relative to OMO (OR 17.3, 95% CI: 6.2, 47.8) or THO (25.5; 8.6, 75.7). CONCLUSION: Using a grading system, we demonstrated that the CSE flap was most visible. Surgeons were more likely to adjust the LP-CSE flap margins based on fluorescence patterns and were more likely to rely on LP when visualization scores were low. CLINICAL SIGNIFICANCE: NIRFA has possible applications identifying some direct cutaneous arteries of APFs and their associated angiosomes in real-time. Further investigation is indicated to study NIRFA's potential to improve patient specific APF planning.

Outcome of video-assisted thoracoscopic treatment of idiopathic chylothorax in 15 cats.

OBJECTIVE: To evaluate the outcomes and complications of video-assisted thoracoscopic (VATS) treatment of chylothorax in cats. STUDY DESIGN: Multi-institutional retrospective study. ANIMALS: Fifteen client-owned cats. METHODS: The medical records of cats undergoing thoracoscopic thoracic duct ligation (TDL) for treatment of idiopathic chylothorax were reviewed. Cats undergoing additional procedures including thoracoscopic pericardectomy and/or laparoscopic cisterna chyli ablation (CCA)_were included. Follow up was obtained through communication with the referring veterinarian or owner. RESULTS: All cats underwent thoracoscopic TDL. Thirteen cats underwent simultaneous pericardectomy and two cats underwent laparoscopic CCA without pericardectomy. Conversion from a thoracoscopic to open approach was necessary in 2/15 (13%) of thoracic duct ligations and 1/11 (9%) of pericardectomies. The most common postoperative complication was persistent pleural effusion in five cats (33%). Four of 15 cats (27%) died or were euthanized prior to hospital discharge following surgery. Recurrence of effusion occurred in 1/7 (14%) of cats that sustained resolution of the effusion at the time of surgery with a median follow up of 8 months. The overall mortality attributed to chylothorax was 47%. CONCLUSION: Thoracoscopic treatment of idiopathic chylothorax resulted in a low incidence of intraoperative complications or conversion in the study population; however, mortality related to feline idiopathic chylothorax remained high. CLINICAL SIGNIFICANCE: While VATS treatment of idiopathic chylothorax is technically feasible, further consideration of the underlying pathology and current treatment algorithm is needed to improve outcomes as this remains a frustrating disease to treat in the feline population.

Computed tomographic features of double aortic arch in six dogs.

Double aortic arch (DAA) is a rare, congenital anomaly in small animals, resulting in a complete vascular ring encircling the esophagus and trachea, and subsequent compression of these organs. Few studies have reported utilizing CT angiography (CTA) for diagnosing DAA in dogs; thus, the imaging features are currently lacking in the literature. The objectives of this retrospective, multicenter, descriptive case series were to report the clinical and CTA characteristics of DAA in surgically treated cases. Medical records and CTA images were reviewed. Six juvenile dogs met the inclusion criteria (median age: 4.2 months; range: 2-5 months). The most common clinical signs included chronic regurgitation (100%), decreased body condition (67%), and coughing (50%). Common CTA features of DAA included a dominant left aortic arch (median diameter: 8.1 mm) and minor right aortic arch (median diameter: 4.3 mm; 83%), an aberrant right subclavian artery arising directly from the right aortic arch (83%), segmental esophageal constriction (100%), and variable degrees of dilation cranial to the heart base, and marked tracheal luminal compression (median percent change: -55%; 100%) and leftward curvature of the trachea at the level of the bifurcation of the aortic arches (100%). All dogs underwent successful surgical correction with only minor postoperative complications. Due to the similarity of clinical and imaging characteristics described to that of other forms of vascular ring anomalies (VRA), CTA is vital for the specific diagnosis of DAA in dogs.

Laparoscopic or laparoscopic-assisted cystopexy for pelvic bladder in 3 dogs.

The techniques and clinical outcomes of laparoscopic or laparoscopic-assisted cystopexy in 3 dogs diagnosed with pelvic bladder are reported herein. The medical records of 2 dogs with pelvic bladder which underwent laparoscopic cystopexy, and 1 dog which underwent laparoscopic-assisted cystopexy were reviewed. Data retrieved included signalment, clinical signs, diagnostic imaging, surgical technique, and clinical outcome. Long-term follow-up was obtained by verbal interviews with owners. Laparoscopic or laparoscopic-assisted cystopexy was successfully performed to reposition the urinary bladder within the abdominal cavity in all dogs. An intracorporeal suture technique was used in 2 dogs, whereas an extracorpreal technique was used in 1 dog. Two dogs with stranguria experienced complete resolution immediately following surgery and remained disease-free at 18 mo after cystopexy. A third dog with urinary incontinence subjectively improved (according to the owner) but had not resolved completely 2 d following surgery. Key clinical message: Laparoscopic or laparoscopic-assisted cystopexy may be an effective treatment for pelvic bladder in dogs and may offer a minimally invasive alternative to laparotomy. Male dogs with stranguria as the primary clinical sign may experience complete resolution following cystopexy.

Cystopexie laparoscopique ou assistée par laparoscopie pour une vessie pelvienne chez trois c hiens. Les techniques et les résultats cliniques de la cystopexie laparoscopique ou assistée par laparoscopie chez trois chiens diagnostiqués avec une vessie pelvienne sont rapportés ici.Les dossiers médicaux de deux chiens ayant une vessie pelvienne ayant subi une cystopexie laparoscopique et d'un chien ayant subi une cystopexie assistée par laparoscopie ont été examinés. Les données récupérées comprenaient le signalement, les signes cliniques, l'imagerie diagnostique, la technique chirurgicale et les résultats cliniques. Le suivi à long terme a été obtenu par des entrevues verbales avec les propriétaires.La cystopexie laparoscopique ou assistée par laparoscopie a été réalisée avec succès pour repositionner la vessie dans la cavité abdominale chez tous les chiens. Une technique de suture intracorporelle a été utilisée chez deux chiens, tandis qu'une technique extracorporelle a été utilisée chez un chien. Deux chiens atteints de strangurie ont connu une résolution complète immédiatement après la chirurgie et sont restés sans maladie à 18 mois après la cystopexie. Un troisième chien souffrant d'incontinence urinaire s'est amélioré subjectivement (selon le propriétaire) mais celle-ci n'a pas complètement disparu 2 jours après la chirurgie.Message clinique clé :La cystopexie laparoscopique ou assistée par laparoscopie peut être un traitement efficace pour une vessie pelvienne chez le chien et peut offrir une alternative peu invasive à la laparotomie. Les chiens mâles atteints de strangurie comme signe clinique principal peuvent connaître une résolution complète après la cystopexie.(Traduit par Dr Serge Messier).

Prospective evaluation of lymphatic embolization as part of the treatment in dogs with presumptive idiopathic chylothorax.

OBJECTIVE: To describe the embolization technique and short-term clinical outcome in dogs undergoing lymphatic embolization (LE) as part of treatment for presumptive idiopathic chylothorax (IC). Additionally, to document findings in computed tomography lymphangiography (CTLa) following embolization. STUDY DESIGN: Prospective case series. ANIMALS: Eight client-owned dogs. METHODS: Dogs underwent CTLa followed by thoracic duct ligation (TDL), pericardiectomy (PC) and LE. A mixture of 3:1 lipiodol: n-butyl cyanoacrylate embolic solution was injected through a catheterized mesenteric lymphatic vessel via limited abdominal approach using intraoperative fluoroscopy. CTLa was scheduled for 12 weeks postoperatively, and long-term follow-up was obtained via telephone contact. RESULTS: LE was technically successful in six of the eight dogs; and clinically successful in five of the six dogs. In the unsuccessful dog, a diagnosis of lymphangiosarcoma was determined, and the owners elected for euthanasia. Five dogs who underwent successful LE underwent CTLa at 12 weeks. Complete resolution of pleural effusion occurred in three dogs and scant pleural effusion in two dogs. A robust lymphatic embolus preventing antegrade continuation of radiocontrast was documented in all five dogs. Five of the six dogs that underwent LE, were alive and clinically normal at 358-960 days postoperatively. CONCLUSIONS: LE is a feasible part of treatment for dogs with IC. Additionally, a robust lymphatic embolus and lack of radiocontrast flow past the embolus was documented at 12 weeks following surgery. CLINICAL SIGNIFICANCE: LE has the potential to reduce surgical failure by reducing efferent lymphatic chyle flow, occluding missed lymphatic branches and preventing the development of collateral branches.

Transient recovery problem in acoustics: A multichannel model-based deconvolution approach.

Critical acoustical systems operating in complex environments contaminated with disturbances and noise offer an extreme challenge when excited by out-of-the-ordinary, impulsive, transient events that can be undetected and seriously affect their overall performance. Transient impulse excitations must be detected, extracted, and evaluated to determine any potential system damage that could have been imposed; therefore, the problem of recovering the excitation in an uncertain measurement environment becomes one of multichannel deconvolution. Recovering a transient and its initial energy has not been solved satisfactorily, especially when the measurement has been truncated and only a small segment of response data is available. The development of multichannel deconvolution techniques for both complete and incomplete excitation data is discussed, employing a model-based approach based on the state-space representation of an identified acoustical system coupled to a forward modeling solution and a Kalman-type processor for enhancement and extraction. Synthesized data are utilized to assess the feasibility of the various approaches, demonstrating that reasonable performance can be achieved even in noisy environments.

Ligation of the ligamentum arteriosum and aberrant left subclavian artery in five dogs in which persistent right aortic arch had been diagnosed.

OBJECTIVE: To determine and report the diagnosis, treatment, and outcome in dogs with persistent right aortic arch (PRAA) with an aberrant left subclavian artery (ALS) that underwent thoracoscopic surgery. ANIMALS: Dogs with PRAA and an ALS (n = 5). STUDY DESIGN: Short case series. METHODS: Medical records were reviewed from 2014 to 2019. Dogs that underwent thoracoscopy for PRAA with an ALS at an academic referral hospital were included. Signalment, clinical signs, diagnostic imaging, surgical approach, complications, and short- and long-term outcomes were recorded. RESULTS: Persistent right aortic arch with an ALS was identified in five dogs. Dogs initially underwent a three-port intercostal thoracoscopic approach, and an intercostal thoracotomy was performed in converted cases. In all five dogs, the ligamentum arteriosum (LA) and ALS were divided; three were performed by a thoracoscopy alone. Two cases were converted because of poor exposure (1) and requirement to temporary occlude an ALS (1). The ALS was ligated and divided in all dogs without apparent negative effects. No intraoperative or postoperative complications occurred. Four dogs had resolution of regurgitation, three of which required diet modification. One dog had reported regurgitation when it was excited. Median follow-up was 188 days (range, 150-1133). CONCLUSION: Ligation and division of both the LA and the ALS in all dogs in this case series was safe and allowed for improvement in clinical signs and good to excellent long-term outcomes. In addition, both thoracoscopy and thoracotomy were used safely and successfully for ligation and transection of the LA and ALS in all dogs.

Clinical and videofluoroscopic outcomes of laparoscopic treatment for sliding hiatal hernia and associated gastroesophageal reflux in brachycephalic dogs.

OBJECTIVE: To describe a laparoscopic technique for treatment of sliding hiatal hernia (SHH) and associated gastroesophageal reflux (GER) in brachycephalic dogs and document clinical and videofluoroscopic outcomes postoperatively. STUDY DESIGN: Prospective clinical trial. ANIMALS: Eighteen client-owned dogs. METHODS: A three-port laparoscopic approach was used. Intracorporeal suturing was used for hiatal plication and esophagopexy, and left-sided laparoscopic or laparoscopic-assisted gastropexy was performed. A standardized canine dysphagia assessment tool (CDAT) questionnaire was completed by owners pre- and postoperatively. Videofluoroscopic swallow studies (VFSS) were used to evaluate esophageal function, and impedance planimetry was used to assess lower esophageal sphincter geometry preoperatively and in a subset of dogs postoperatively. RESULTS: Median age was 27.5 (range 5-84) months. Conversion to open surgery was necessary in 1 (5.5%) of 18 dogs. Regurgitation after eating, and associated with activity/exercise, improved significantly when comparing pre- and postoperative CDAT assessments. Hiatal hernia and GER severity scores improved significantly between pre- and postoperative VFSS assessments, whereas SHH and GER frequency scores did not. One dog developed pneumothorax intraoperatively, underwent cardiopulmonary arrest, and died. Minor complications included splenic (n = 6) and hepatic lacerations (n = 3) that did not require specific therapy. CONCLUSION: A laparoscopic approach to treatment of SHH and GER led to improvements in clinical and VFSS indices in the majority of brachycephalic dogs. However, a subset of dogs still demonstrated some clinical signs postoperatively. CLINICAL RELEVANCE: In experienced hands, laparoscopic treatment of SHH and GER offers a minimally invasive alternative to open surgery.

Feasibility of laparoscopic liver lobectomy in dogs.

OBJECTIVE: To determine the feasibility of laparoscopic liver lobectomy (LLL) in dogs by using canine cadavers and to describe the clinical application in dogs with liver disease. STUDY DESIGN: Ex vivo experiment and descriptive case series. SAMPLE POPULATION: Twelve canine cadavers and six client-owned dogs. METHODS: Cadavers underwent LLL with an endoscopic stapler. The percentage of liver lobe resected was determined by volume. The distance from the staple line to hilus was measured. Medical records of dogs undergoing LLL were reviewed. RESULTS: In cadavers ≤15 kg, left lateral lobectomy completeness was 87.3% (84.6%-96.6%), and remaining median (interquartile range) hilar length was 1 cm (0.25-1.75). Left medial lobectomy completeness was 72.5% (66.7%-80%), and remaining hilar length was 1.6 cm (0.47-1.75). Central division resection completeness was 68.3% (60%-92.9%), and remaining hilar length was 2.7 cm (0.8-5). Laparoscopic liver lobectomy was not feasible for right division lobes and in cadavers >15 kg. Five dogs with peripheral quadrate or left lateral lobe masses underwent stapled, partial laparoscopic lobectomy (30%-90%). One dog underwent stapled, left lateral lobectomy (90%) after open procedure conversion. Histopathological diagnoses included hepatocellular carcinoma (3), nodular hyperplasia (1), biliary cyst adenoma (1), and fibrosis (1). CONCLUSION: Laparoscopic liver lobectomy of the left and central divisions is feasible in cadavers ≤15 kg with an endoscopic stapler. Partial LLL of the left and central divisions is feasible in select dogs with liver disease. CLINICAL SIGNIFICANCE: Laparoscopic liver lobectomy may be a viable alternative to laparotomy in small-to-medium size dogs with peripheral liver masses of the left and central divisions.

Multichannel spectral estimation in acoustics: A state-space approach.

Spectral estimation is a necessary methodology to analyze the frequency content of noisy data sets especially in acoustic applications. Many spectral techniques have evolved starting with the classical Fourier transform methods based on the well-known Wiener-Khintchine relationship relating the covariance-to-spectral density as a transform pair culminating with more elegant model-based parametric techniques that apply prior knowledge of the data to produce a high-resolution spectral estimate. Multichannel spectral representations are a class of both nonparametric, as well as parametric, estimators that provide improved spectral estimates. In any case, classical nonparametric multichannel techniques can provide reasonable estimates when coupled with peak-peaking methods as long as the signal levels are reasonably high. Parametric multichannel methods can perform quite well in low signal level environments even when applying simple peak-picking techniques. In this paper, the performance of both nonparametric (periodogram) and parametric (state-space) multichannel spectral estimation methods are investigated when applied to both synthesized noisy structural vibration data as well as data obtained from a sounding rocket flight. It is demonstrated that for the multichannel problem, state-space techniques provide improved performance, offering a parametric alternative compared to classical methods.

Vibrational processing of a dynamic structural flight system: A multichannel spectral estimation approach.

Dynamic testing of large flight vehicles (rockets) is not only complex, but also can be very costly. These flights are infrequent and can lead to disastrous effects if something were to fail during the flight. The development of sensors coupled to internal components offers a great challenge in reducing their size, yet still maintaining their precision. Sounding rockets provide both a viable and convenient alternative to the more costly vehicular flights. Some of the major objectives are to test various types of sensors for monitoring components of high interest as well as investigating real-time processing techniques. Signal processing presents an extreme challenge in this noisy multichannel environment. The estimation and tracking of modal frequencies from vibrating structures is an important set of features that can provide information about the components under test; therefore, high resolution multichannel spectral processing is required. The application of both single channel and multichannel techniques capable of producing reliable modal frequency estimates of a vibrating structure from uncertain accelerometer measurements is discussed.

In vitro holding strength of the laparoscopic Miller's knot compared with open Miller's knot, open surgeon's throw, and laparoscopic surgeon's throw in a vascular pedicle model.

OBJECTIVE: To compare in vitro knot holding strength of the laparoscopic Miller's knot (LMK), open Miller's knot (MK), open surgeon's throw (Sx), and laparoscopic surgeon's throw (LSx) in a vascular pedicle model when used as the first throw for vascular ligation. STUDY DESIGN: Experimental study. SAMPLE POPULATION: Ten constructs each of the Miller's knot and surgeon's throw performed openly and laparoscopically with 2-0 polyglyconate suture. METHODS: Knot holding strengths of the LMK, MK, LSx, and Sx knots were evaluated on balloon dilation catheters used as vascular pedicle models. Laparoscopic knots were tied in a laparoscopic box trainer. Knot constructs were pressure tested to failure. Results were compared by Kruskal-Wallis and Steel-Dwass comparisons. RESULTS: Both MK and LMK had mean leakage pressures above 300 mm Hg. The MK leaked at higher pressure than all other knots, including the LMK (P < .001). The LMK leaked at greater pressures compared with the Sx and the LSx (P < .001). No difference was detected between leaking pressures of the Sx and the LSx (P = .226), with both leaking at pressures below 40 mm Hg. CONCLUSION: The LMK created a more secure first throw compared with the Sx and leaked at supraphysiologic pressures. CLINICAL SIGNIFICANCE: The LMK has excellent knot holding strength on a vascular pedicle model and may be further evaluated for clinical application.

Initial leak pressures of four anastomosis techniques in cooled cadaveric canine jejunum.

OBJECTIVE: To compare the effectiveness of four different intestinal anastomosis techniques at preventing leakage after enterectomy. STUDY DESIGN: Experimental study. SAMPLE POPULATION: Grossly normal jejunal segments (N = 70) from three fresh canine cadavers. METHODS: Eight-centimeter cooled canine cadaveric jejunal segments were randomly assigned to a control group (six segments) and four treatment groups (16 segments each [two segments/anastomotic construct]): (1) handsewn anastomosis (HSA), (2) barbed suture anastomosis (B-HSA), (3) stapled functional end-to-end anastomosis (SFEEA), and (4) stapled functional end-to-end anastomosis with an oversew (SFEEA-O). Control segments and anastomotic constructs were infused intraluminally to the point of leakage. Initial leak pressures were recorded and compared. RESULTS: Initial leak pressures (median + range) for jejunal control segments, HSA, B-HSA, SFEEA, and SFEEA-O were 331.88 mmHg (range, 315.34-346.64), 35.17 (20.29-56.24), 24.99 (6.08-38.64), 28.77 (18.80-85.09), and 35.92 (12.05-80.71), respectively. No difference was detected between leak pressures of anastomosed segments (P = .35), all of which were more variable and lower than those of intact segments. CONCLUSION: No difference in initial leak pressures was detected between the four anastomosis techniques tested in cooled canine cadaveric jejunum. CLINICAL SIGNIFICANCE: All four anastomosis techniques evaluated in this study may be suitable in dogs.

Vascular ring anomalies in cats: 20 cases (2000-2018).

OBJECTIVE: To report the clinical characteristics, types of vascular ring anomalies (VRA), operative findings, complications, and survival after surgical treatment of cats with VRA. STUDY DESIGN: Retrospective, multi-institutional case series. ANIMALS: Client- or shelter-owned cats presenting to academic, referral veterinary institutions. METHODS: Medical records of cats with VRA that underwent surgical treatment were reviewed. Signalment, relevant medical history, clinical signs, diagnostic imaging, surgical findings, complications, and survival were recorded. RESULTS: Twenty cats with VRA were included. Vascular ring anomalies were most commonly (75% [15/20]) diagnosed in cats less than 1 year old, with no breed or sex predilection. Regurgitation was the most common clinical sign, present in 18 of 20 (90%) cats. A persistent right aortic arch was diagnosed in 17 of 20 (85%) cats, with concurrent aberrant left subclavian artery in four of the cats. Surgical treatment was associated with survival to discharge in 18 of 20 (90%) cats. Persistent clinical signs were reported in nine of 13 (69%) cats, and radiographic evidence of megaesophagus persisted in four of 13 (31%) cats, with a median follow-up of 275 days after discharge. CONCLUSION: Persistent right aortic arch was the most commonly diagnosed VRA in cats in this series, although multiple anomalies were observed. Surgical treatment of VRA in cats was associated with a high survival to discharge, although persistence of clinical signs and megaesophagus was noted in 69% and 31% of the cats, respectively. CLINICAL SIGNIFICANCE: Surgical treatment of VRA in cats is associated with a high survival rate; however, persistence of clinical signs is an expected outcome.

Cadaveric evaluation of fluoroscopy-assisted placement of one-lung ventilation devices for video-assisted thoracoscopic surgery in dogs.

OBJECTIVE: To evaluate the feasibility of fluoroscopy-assisted placement of one-lung ventilation (OLV) devices in dogs. STUDY DESIGN: Experimental study. SAMPLE POPULATION: Canine cadavers (n = 8) weighing between 20.2 and 37.4 kg. METHODS: Thoracoscopic access with a two-port approach was established to evaluate bilateral lung ventilation patterns. Advancement of a left-sided Robertshaw double-lumen endobronchial tube (DLT) and the EZ-blocker (EZ) were evaluated under direct fluoroscopic guidance. Each dog also underwent bronchoscopy-assisted placement of an Arndt endobronchial blocker (EBB). Time to initial placement, success of creating complete OLV (after initial placement attempt and after up to two repositionings), and ease of placement score were recorded. Device position was evaluated bronchoscopically after each fluoroscopy-assisted placement attempt. RESULTS: Time to initial placement was significantly shorter for EZ than for DLT and EBB. The rate of successful placement after up to two repositioning attempts was 87.5%, 87.5%, and 100.0% on the right and 87.5%, 100.0%, 100.0% on the left for DLT, EZ, and EBB, respectively, and was not different between devices. Ease of placement scores were significantly higher for DLT compared with EZ and EBB on both the left and the right sides. CONCLUSION: Fluoroscopy-assisted placement of DLT and EZ appears feasible in canine cadavers. EZ-blocker placement was efficient and technically easier than DLT, but positioning must be adapted for dogs. Bronchoscopy-assisted placement of EBB remains highly successful. CLINICAL SIGNIFICANCE: Fluoroscopy-assisted placement of EZ and DLT is a useful alternative to bronchoscopy-assisted placement of these OLV devices.

Clinical findings and outcomes of 153 dogs surgically treated for intestinal intussusceptions.

OBJECTIVE: To describe perioperative characteristics and outcomes of dogs surgically treated for intestinal intussusception. STUDY DESIGN: Multi-institutional, retrospective study. ANIMALS: One hundred fifty-three client-owned dogs with intestinal intussusception. METHODS: Dogs were included when they had undergone surgical treatment of a confirmed intestinal intussusception. Medical records were reviewed for demographics and clinical data, including surgical complications (graded 1-4). Follow-up was obtained via telephone interview with owners and referring veterinarians. RESULTS: Dogs had a median age of 10 months (range, 2-156), and the most common location for intussusception was ileocolic (66/153 [43%]). Most cases had no identifiable cause (104/155 [67%]). Intestinal resection and anastomosis (IRA) was performed in 129 of 153 (84%) dogs; enteroplication was performed in 28 of 153 (18%) dogs, including 13 with and 15 without IRA. Intraoperative complications occurred in 10 of 153 (7%) dogs, all involving intestinal damage during attempted manual reduction. The median duration of follow-up after discharge was 334 days (interquartile range, 15-990; range, 1-3302). Postoperative complications occurred in 53 of 153 (35%) dogs, including 22 of 153 (14%) with severe (grade 3 or 4) events. Diarrhea, regurgitation, and septic peritonitis were the most common postoperative complications; intussusception recurred in four of 153 (3%) dogs, all within 72 hours postoperatively. Fourteen-day postoperative mortality rate was 6%. CONCLUSION: Surgical treatment of intestinal intussusception was curative in most dogs, even when an underlying cause was not identified. Surgical complications were common, including a 14% risk of life-threatening short-term complications. CLINICAL SIGNIFICANCE: Surgical treatment of intestinal intussusception offers an excellent prognosis, but the potential life-threatening complications should be considered.

Prognostic factors for short-term survival of dogs that experience postattenuation seizures after surgical correction of single congenital extrahepatic portosystemic shunts: 93 cases (2005-2018).

OBJECTIVE: To identify prognostic factors for short-term survival of dogs that experience seizures within 7 days after surgical correction of single congenital extrahepatic portosystemic shunts (cEHPSS). STUDY DESIGN: Multi-institutional retrospective study. SAMPLE POPULATION: Ninety-three client-owned dogs. METHODS: Medical records at 14 veterinary institutions were reviewed to identify dogs that underwent surgical attenuation of a single cEHPSS from January 1, 2005 through February 28, 2018 and experienced postattenuation seizures (PAS) within 7 days postoperatively. Logistic regression analysis was performed to identify factors associated with 1-month survival. Factors investigated included participating institution, signalment, shunt morphology, concurrent/historical conditions, presence of preoperative neurologic signs, presence of preoperative seizures, aspects of preoperative medical management, surgical details including method and degree of shunt attenuation, type of PAS (focal only or generalized ± focal), drugs administered as part of the treatment of PAS, and development of complications during treatment of PAS. RESULTS: Thirty (32.3%) dogs survived to 30 days. Seventy-six (81.7%) dogs experienced generalized PAS. Factors positively associated with short-term survival included having a history of preoperative seizures (P = .004) and development of focal PAS only (P = .0003). Most nonsurvivors were humanely euthanized because of uncontrolled or recurrent seizures. CONCLUSION: Dogs that experienced PAS that had a history of preoperative seizures and those that experienced focal PAS only had significantly improved short-term survival. CLINICAL SIGNIFICANCE: The results of this study provide information that will help in the counseling of owners who seek treatment for PAS after surgical correction of cEHPSS. © 2020 The American College of Veterinary Surgeons.

Outcome after surgical and conservative treatments of canine peritoneopericardial diaphragmatic hernia: A multi-institutional study of 128 dogs.

OBJECTIVE: To compare demographics and disease characteristics in dogs in which peritoneopericardial diaphragmatic hernia (PPDH) had been diagnosed and report outcomes after surgical treatment (ST) or conservative treatment (CT). STUDY DESIGN: Retrospective study. SAMPLE POPULATION: One hundred twenty-eight dogs (91 ST, 37 CT) in which PPDH had been diagnosed. METHODS: Medical records were reviewed for demographics, perioperative findings, and outcomes. Follow-up was obtained via telephone interview and email correspondence with owners and referring veterinarians. Baseline variables were compared between treatment groups. RESULTS: Dogs treated surgically were younger (P < .001), more likely to be sexually intact (P = .002), more likely to have clinical signs from PPDH vs an incidental diagnosis (P < .001), and more likely to have other congenital abnormalities (P = .003) compared with dogs treated conservatively. Ninety-seven percent of ST dogs were discharged from hospitals. Intraoperative and postoperative complications were reported in 22% and 41% of dogs, respectively, although most complications were classified as low grade (75% and 83%, respectively). Follow-up was available in 87 dogs, at a median of 1062 days. Hernia recurrence was not reported in any surgically treated dog. The deaths of nine dogs (five ST, four CT) could be attributed to PPDH, and long median survival times were observed in both the ST and CT groups (8.2 and 5 years, respectively). CONCLUSION: Preoperative characteristics differed between dogs treated conservatively vs surgically. Surgical treatment was associated with low operative mortality, and both ST and CT dogs had good long-term survival. CLINICAL SIGNIFICANCE: A diagnosis of PPDH can confer a good long-term prognosis for both ST and CT dogs.

Single-Port Laparoscopic Treatment and Outcome of Dogs with Ovarian Remnant Syndrome: 13 Cases (2010-2018).

Ovarian remnant syndrome (ORS) is a condition resulting from incomplete removal of ovarian tissue during ovariectomy and/or ovariohysterectomy. Single-port laparoscopy (SPL) is an alternative to ventral midline laparotomy for treatment of ORS. Medical records of 13 client-owned female dogs who underwent SPL for the treatment of ORS were retrospectively reviewed to evaluate surgical technique and outcome. Dogs who had undergone a previous attempt at open ovariectomy or ovariohysterectomy were included. Major intraoperative complications did not occur and conversion to open laparotomy was not required. In 1 dog, an SPL + 1 technique was used, in which an additional port was placed cranial to the single-port device to aid in dissection and tissue manipulation. Median surgical time was 45 min (range, 30-90 min). Clinical signs related to estrus had resolved in 11 of 13 dogs with a median follow-up time of 18 mo. Two of 13 dogs were lost to follow-up at 3 mo postoperatively; however, signs of estrus had resolved at time of last follow-up. SPL treatment for ORS was feasible and successful in this cohort of dogs. Reduced surgical time was found in this study compared with previous reports investigating multiple-port laparoscopic treatment of ORS.