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Topic:Complications

Complications in horses refer to unexpected medical or surgical issues that arise during the course of treatment or recovery. These complications can affect various systems within the horse's body and may result from underlying conditions, medical interventions, or environmental factors. Common complications in equines include laminitis, colic, infections, and respiratory issues. Each complication presents distinct clinical challenges and requires careful management to mitigate adverse outcomes. This section compiles peer-reviewed research studies and scholarly articles that explore the incidence, etiology, management strategies, and outcomes associated with complications in equine health.
Complications of Respiratory Surgery in the Horse.
The Veterinary clinics of North America. Equine practice    September 26, 2025   Volume 41, Issue 3 509-527 doi: 10.1016/j.cveq.2025.08.004
Phillips NAI, Hackett ES.Respiratory surgery and procedures typically focus on conditions of the upper airway that restrict airflow at rest or exercise. This article focuses on respiratory anatomy and common surgeries of the trachea and larynx in horses. The trachea serves as the airway conduit from the larynx to the bronchi. A variety of upper airway disorders can lead to obstruction and in these instances, tracheotomy is typically utilized to bypass these obstructions and maintain airway patency. Emergency and permanent tracheotomy procedures are discussed. Other common upper airway operations, such as laryngotomy, ...
Equine Abdominal Surgery: Predicting and Preventing Postoperative Complications.
The Veterinary clinics of North America. Equine practice    September 24, 2025   Volume 41, Issue 3 495-507 doi: 10.1016/j.cveq.2025.08.003
Mudge M.Morbidity after equine abdominal surgery is common and post-operative complications can be costly to owners. The focus of this article is on intraoperative decision-making and current evidence, including surgical techniques and prognostic information that can prevent and predict complications. Emerging techniques for intra-operative monitoring and intestinal viability assessment, anastomotic techniques, body wall suturing, peritonitis treatment, and pain management are discussed.
Midline vs. flank laparotomy- criteria for choosing the optimal surgical technique for uterine torsion correction in the mare.
BMC veterinary research    September 24, 2025   Volume 21, Issue 1 542 doi: 10.1186/s12917-025-04883-w
Samsel J, Gündemir O, Szara T, Witkowski M.Uterine torsion in mares belongs to maternal pregnancy disorders, accounting for 5-10% of complications in the last trimester of pregnancy. Two surgical techniques for repositioning uterine torsion are used: flank laparotomy in local anesthesia on a standing mare (SFL) and midline laparotomy carried out under general anesthesia (MI). The study aims to present the exact protocol used by the authors to qualify a mare with uterine torsion for surgery using one of the above-mentioned methods.A total of 19 mares were operated on, of which 13 underwent midline laparotomy under general anesthesia, an...
Evaluation of a modified one-stage technique for repair of third-degree perineal laceration and rectovestibular fistula with rectal pull-back technique in 12 mares: a retrospective case series.
BMC veterinary research    September 17, 2025   Volume 21, Issue 1 538 doi: 10.1186/s12917-025-04824-7
Sharshar A, Hammad A, Salem M, El-Sunsafty M.This study was carried out to evaluate a rectal pull-back one-stage technique, which is a modification of the one-stage Goetz technique, for treating third-degree perineal laceration or rectovestibular fistula. Methods: This study was performed on 12 mares, ten of whom suffered from third-grade perineal laceration, and two suffered from rectovestibular fistula and were included in this study. After incision of the vestibular shelf horizontally, the dissected rectal flap was pulled caudally and sutured to the anal sphincter during its reconstruction at the final stage. While the vestibular shel...
Correction: Risk assessment in equine anesthesia: a first evaluation of the usability, utility and predictivity of the two-part CHARIOT.
Frontiers in veterinary science    September 11, 2025   Volume 12 1685121 doi: 10.3389/fvets.2025.1685121
Brumund L, Wittenberg-Voges L, Rohn K, Kästner SBR.[This corrects the article DOI: 10.3389/fvets.2024.1384525.].
Equine maxillofacial intraosseous cystic lesions: a retrospective study of 17 cases.
Frontiers in veterinary science    September 10, 2025   Volume 12 1644866 doi: 10.3389/fvets.2025.1644866
Kelley JL, Rawlinson JE, Bell CM.Cystic and pseudocystic masses of the equine maxilla and mandible are rare lesions that result in clinically significant morbidity and/or mortality for the patient. Previous literature consists of case reports or case series. Few studies have addressed the variety of cystic lesions and comparative features. The aim of this study was to retrospectively describe the clinical signs, imaging findings, histopathologic diagnoses, treatments, and clinical outcomes for cystic masses in the equine maxilla and mandible. Unassigned: Cases were recruited from six sources including a pathology laboratory, ...
Horsing Around: A Retrospective Study of Equestrian Related Eye Injuries in the Emergency Department.
The Journal of emergency medicine    September 10, 2025   Volume 79 446-452 doi: 10.1016/j.jemermed.2025.09.009
Moran C, Harrington M, Barnett J, Wayman L, Bond J.Equestrian activities pose significant risks for ocular and ocular adnexal injuries, particularly from horse kicks and falls from horse riding. Objective: This study characterizes the spectrum of horse-related ocular trauma, analyzes outcomes, and provides recommendations for management of these injuries. Methods: A retrospective review was conducted at a large academic medical institution in the southeastern U.S. using ICD codes to identify horse-related ocular trauma cases. Demographics, injury mechanisms, clinical presentation, treatment, and long-term sequelae were analyzed. Results: Fifty...
Laparoscopic cryptorchidectomy in 10 equids using a single incision laparoscopic surgery (SILS) port device.
The Canadian veterinary journal = La revue veterinaire canadienne    September 1, 2025   Volume 66, Issue 9 966-973 
Muñoz AM, Cribb N.Minimally invasive laparoscopic surgical techniques are desirable in horses and other equids. A new approach called "modified single incision laparoscopic surgery (SILS) for equine cryptorchidectomy" is described, along with the postoperative outcomes of 10 equids. A SILS Port device (Covidien) was placed a 30- to 40-millimeter incision in combination with 1 or 2 15-millimeter para-inguinal incisions to exteriorize the intra-abdominal testicles. Ten animals, 2 bilateral abdominal cryptorchid horses and 8 unilateral abdominal cryptorchid equids, underwent cryptorchidectomy using the SILS tech...
Global survey on the utilisation and experiences with different retrobulbar anaesthesia techniques in horses.
Equine veterinary journal    August 23, 2025   doi: 10.1111/evj.70082
Lieberth S, Thieme K, Dancker C, Merle R, Eule JC.Retrobulbar anaesthesia (RBA) is relevant for ocular surgery in standing sedated horses. Objective: Gathering insights on experiences with RBA techniques. Methods: Cross-sectional survey. Methods: An online survey collected information on the respondents' professional background, indications, injection methods, use of ultrasound assistance, medication, and complications associated with RBA in horses. Results: Two-hundred and thirty-eight veterinarians from 25 countries contributed. 86.1% were members of veterinary specialty colleges. RBA indications were enucleation (97.8%), corneal surgery (2...
Retrospective Evaluation of Dystocia in Miniature Equids: 78 Cases (2002-2023).
Journal of veterinary emergency and critical care (San Antonio, Tex. : 2001)    August 21, 2025   Volume 35, Issue 4 386-391 doi: 10.1111/vec.70014
Merari A, Fielding L.To describe patient characteristics, laboratory data, fetal orientation, methods of correction, survival, and treatment in miniature equids with dystocia. Methods: Retrospective study conducted from January 2002 to June 2023. Methods: Equine referral hospital and field service. Methods: Seventy animals with a total of 78 instances of dystocia. Methods: None. Results: Recorded variables included signalment, clinicopathologic data, fetal presentation, correction method, survival to discharge, and complications. The survival of miniature equid mares was 94% (73/78), while survival of foals was 17...
Primary Jejunal Impactions Resolved via Exploratory Celiotomy in Six Horses: 2017-2023.
Animals : an open access journal from MDPI    August 12, 2025   Volume 15, Issue 16 2363 doi: 10.3390/ani15162363
Willette J, Guinn A, Munsterman A.Impactions of the jejunum are rarely described in the literature. The current case series describes six cases of adult horses with jejunal impactions with feed material diagnosed by exploratory celiotomy. Horses underwent exploratory celiotomy based off of their degree of pain despite medical management and concerns for a primary strangulating small intestinal lesion. All jejunal impactions were relieved via manual decompression of the impaction into the cecum. None of the cases underwent a resection or anastomosis at the site of impaction. All horses were treated with gastroprotectants (omepr...
Ultrasound-Guided Radiofrequency Ablation and Pulsed Radiofrequency Treatment for Chronic Lameness Due to Distal Forelimb Disease in Horses: A Pilot Study.
Animals : an open access journal from MDPI    August 10, 2025   Volume 15, Issue 16 2341 doi: 10.3390/ani15162341
Amari M, Brioschi FA, Auletta L, Ravasio G.Radiofrequency ablation (RFA) and pulsed radiofrequency (PRF) are non-pharmacological techniques employed in humans for chronic pain, but their veterinary application is unexplored. This pilot study evaluated clinical effects of RFA and PRF in twenty-four horses with chronic distal forelimb lameness. Ultrasound-guided RFA (N = 8; 60-90 °C, 2-8 min) or PRF (N = 16; 42 °C; 12 min) was applied to palmar digital nerves. Lameness was scored (American Association of Equine Practitioners scale) at baseline and monthly for six months (T1-T6). At T2, partial- and non-responders in both groups receive...
Surgical Assessment and Post-Operative Complications Following Video-Assisted Thoracoscopic Surgery (VATS) of Horses with Severe Equine Pasture Asthma During Asthma Exacerbation and Remission.
Animals : an open access journal from MDPI    August 4, 2025   Volume 15, Issue 15 2276 doi: 10.3390/ani15152276
Wenzel CJ, Mochal-King CA, Eddy AL, Bowser JE, Wills RW, Jumper WI, Claude A, Swiderski CE.The aim of this retrospective clinical study was to assess surgical duration and surgical and post-operative complications associated with Video-Assisted Thoracoscopic Surgery (VATS) and lung biopsy in horses with severe Equine Pasture Asthma (EPA) and paired control horses. Twelve horses (6 EPA-affected, 6 control) were sex, age and breed matched. Twenty-four thoracic surgeries were performed. Surgery of each matched pair (EPA-affected and healthy) was performed during asthma exacerbation (summer) and remission (winter). Surgical times were shorter with uncomplicated thoracoscopy (85 min) and...
Description and Complications of a New Modified Semi-Closed Castration Technique in Horses.
Veterinary sciences    July 31, 2025   Volume 12, Issue 8 720 doi: 10.3390/vetsci12080720
Gandini M, Bertone C, Giusto G.Castration remains a common surgical procedure in equids, yet postoperative complications such as hemorrhage, infection, and eventration persist, influencing surgical outcomes. This retrospective study introduced a novel modified semi-closed castration technique aimed at minimizing these complications. Eighty-five sexually intact mature male equids (including horses, ponies, and donkeys) underwent the described inguinal castration procedure under general anesthesia. The technique involved a carefully managed opening and subsequent secure closure of the parietal vaginal tunic, enabling direct i...
Possible association of short-term complications and antimicrobial use in standing equine cheek tooth extractions 2018-2022.
Equine veterinary journal    July 13, 2025   doi: 10.1111/evj.14563
Schnierer M, Nekouei O, Huber LC, Jehle M, Biermann N.Despite growing concerns about antimicrobial resistance, prophylactic antimicrobials continue to be routinely administered in many procedures, including dental extractions. Further evidence-based research is needed on whether their use influences post-operative complication rates. Objective: To identify risk factors for short-term complications, associations between complications and antimicrobial use as well as factors leading to antimicrobial use in equine (standing) cheek tooth extractions. Methods: Retrospective analysis of clinical records. Methods: Data were extracted from records of hor...
Short- and long-term survival, complications, return to racing, and racing performance of 150 racehorses with medial condylar fractures of the third metacarpal/metatarsal bone treated by internal fixation (2000-2020).
Veterinary surgery : VS    July 4, 2025   Volume 54, Issue 6 1176-1184 doi: 10.1111/vsu.14308
Ruspi BD, Bramlage LR, Ruggles AJ, Slone SA.To report the rate of survival, rate of return to racing, and quality of racing performance following surgical fixation of medial condylar fractures. Methods: Retrospective study. Methods: A total of 150 Thoroughbred and Standardbred racehorses surgically treated for medial condylar fracture (100 lag screw fixation, 50 plate fixation). Methods: Medical records, radiographs, and racing databases (2000-2020) were reviewed to collect signalment, fracture characteristics, fixation methods, survival rate, and complication rate. Change in racing performance was assessed using Wilcoxon rank sum tests...
What ‘knot’ to do whilst castrating donkeys. A retrospective comparison of ligation method on spermatic cord haemorrhage in 261 donkeys castrated by vet students in rural Malawi using transfixing and modified millers’ ligatures.
Journal of equine veterinary science    June 30, 2025   Volume 152 105639 doi: 10.1016/j.jevs.2025.105639
Yeomans A, Hampson R, Razemba T.Special considerations for donkeys undergoing castration compared with horses include the presence of large scrotal vessels, larger testicular artery and vein and the consequential increased risk of post-operative haemorrhage which necessitates spermatic cord ligation. Objective: This retrospective study compares haemorrhagic complication rates between two methods of spermatic cord ligation in donkeys castrated in rural Malawi. Methods: All donkeys presenting to Veterinary Education Malawi / Lilongwe Society for the Protection and Care of Animals rural large animal outreach clinics for castrat...
Mosaic arthroplasty in equine stifle and fetlock joints: A retrospective study of 31 cases between 1998 and 2023.
Veterinary surgery : VS    June 27, 2025   doi: 10.1111/vsu.14296
Pál Z, Tuska P, Vásárhelyi G, Hangody L, Hurtig M, Kaposi AD, Bodó G.To evaluate the clinical application of equine mosaic arthroplasty for joint surface repair, including outcomes and complications. Methods: Retrospective clinical study. Methods: A total of 31 horses diagnosed with subchondral bone cysts (SBCs) in the femoral condyle (22/31), distal metacarpus (7/31), or metatarsus (2/31). Methods: Medical records of horses that underwent autologous or allogeneic osteochondral graft transplantation were reviewed. Follow-up lasted at least 12 months. Success was determined in terms of improvements in lameness and post-surgical athletic performance, classified...
Complications associated with subpalpebral lavage systems in upper and lower equine eyelids: A prospective, randomised study in 73 cases (2015-2024).
Equine veterinary journal    June 26, 2025   doi: 10.1111/evj.14540
Graham AE, Carslake HB, Malalana F.Evidence for optimal location of subpalpebral lavage (SPL) systems is lacking. Objective: To compare the rate and types of complications with SPL systems located in central upper- compared with medial lower-eyelid in hospitalised patients. Methods: Prospective, randomised treatment trial. Methods: Horses admitted for ophthalmic treatment using an SPL system from February 2015 to January 2024 were included if ocular pathology did not necessitate SPL system placement in a specific location. Coin toss was used to determine location. SPL systems were monitored at least daily, and complications wer...
Perioperative factors and outcomes associated with antimicrobial therapy duration in horses undergoing exploratory celiotomy.
The Canadian veterinary journal = La revue veterinaire canadienne    June 13, 2025   Volume 66, Issue 6 653-662 
Crabtree NE, Capper AM, McKinnon LH, Epstein KL.The objective was to compare perioperative factors that may influence clinician decisions regarding antimicrobial therapy duration and outcomes in horses undergoing exploratory celiotomy. Unassigned: Horses > 1 mo of age undergoing exploratory celiotomy for colic that survived without repeat celiotomy for ≥ 5 d. Unassigned: Retrospective cohort study. Cases were grouped by duration of antimicrobial therapy: G1, ≤ 24 h; G2, 1 to 3 d; G3, > 3 d. Admission, surgical, and postoperative data from the medical records and long-term outcome assessed telephone follow-up were compared among g...
Evidence Related to the Effects of Intralesional/Intrasynovial Corticosteroids on Tendon/Ligament Homeostasis and Healing.
The Veterinary clinics of North America. Equine practice    May 26, 2025   S0749-0739(25)00024-0 doi: 10.1016/j.cveq.2025.04.006
Quam V.Inflammation plays a role in acute and chronic equine tendon/ligament injury; anti-inflammatories are often indicated. Local corticosteroids provide consistent and profound short-term effects on pain and inflammation across species. However, there is no demonstrated benefit in the long term, and complications can occur. Alternative biologic anti-inflammatory treatments are available and should be used in horses at risk of complications. Nonetheless, corticosteroids remain an affordable and effective anti-inflammatory that, with continued research, may be indicated on a case-by-case basis as pa...
Survey of veterinarians’ usage and satisfaction with intra-articular polyacrylamide gel in horses.
Journal of equine veterinary science    May 19, 2025   105610 doi: 10.1016/j.jevs.2025.105610
Pluim M, Frippiat T.Polyacrylamide gel is increasingly used in equine veterinary medicine for osteoarthritis and other joint disorders. This study aimed to document the indications, treatment protocols, rehabilitation plans, outcomes, and satisfaction with intra-articular polyacrylamide gel in horses, as reported by equine veterinarians. An online questionnaire was distributed to practitioners through the European and American Colleges of Veterinary Sports Medicine and Rehabilitation mailing lists, social media, and direct contact. Of 197 respondents, 160 completed the survey, forming the basis for the descriptiv...
Effect of a ventral midline colopexy on large colon volvulus recurrence and days to next live foal in Thoroughbred broodmares.
Veterinary surgery : VS    May 7, 2025   Volume 54, Issue 5 952-961 doi: 10.1111/vsu.14269
Warren AS, Werner LA, Thombs LA, Rodgerson DH, Spirito MA, Sandow CB, McCracken MJ.To report the impact of ventral midline colopexy on colic, recurrence of large colon volvulus (LCV) and time to next live foal. Methods: Retrospective case control study. Methods: A total of 188 Thoroughbred broodmares surgically treated for LCV (2016-2020). Methods: Horses treated for LCV were grouped based on whether they received a colopexy (CP) or did not (NCP). All broodmares that underwent a second LCV surgery were subsequently categorized into two groups: those that received a colopexy (RCP) and those that did not (NRCP). Differences in the number of horses with large colon compromise, ...
Retrospective radiographic myelogram measurements and long-term outcomes in horses undergoing cervical interbody fusion surgery: 22 cases.
PloS one    May 7, 2025   Volume 20, Issue 5 e0323083 doi: 10.1371/journal.pone.0323083
England D, Newsom L, White C, McKenzie E.Site selection for cervical stabilization surgery in horses with spinal ataxia frequently relies on measurements derived from radiographic myelography. A variety of measurement criteria exist and can provide conflicting results. The main objectives of this study were to assess the correlation between two commonly used myelographic measures, dorsal contrast column reduction (DCCR) and dural diameter reduction (DDR), and their association with previously selected operative sites in a population of horses operated at a tertiary clinic. Secondary objectives were to determine if articular process j...
Surgical technique, outcome, complications, and recurrence rate for removal of extensive perianal melanomas: 50 treated horses.
Journal of the American Veterinary Medical Association    May 7, 2025   Volume 263, Issue 7 914-921 doi: 10.2460/javma.24.12.0816
Haegeman L, Foucaud M, Joostens Z, Declercq J, Vinardell T, Kadic D, Mariën T.To describe surgical treatment and outcome for horses with extensive perianal melanomas. Unassigned: Gray horses treated surgically for extensive perianal melanoma between July 1, 2020, and July 31, 2023, were eligible. Horses without the entire perianal skin covered with coalescing or ulcerating melanomas were excluded. Unassigned: 59 horses (30 mares, 27 geldings, and 2 stallions) met the inclusion criteria. Median age was 16 years (range, 7 to 28 years). Clinical signs included tenesmus (n = 53), weight loss (3), and hind limb lameness (1). Six horses presented with no complaints; in these ...
Sixty years of equine anaesthesia – are we getting better at it?
Veterinary anaesthesia and analgesia    May 7, 2025   Volume 52, Issue 6 720-729 doi: 10.1016/j.vaa.2025.04.012
Taylor PM, Gozalo-Marcilla M, Bettschart-Wolfensberger R, Redondo JI, Johnston GM.To present the essence of the presentation 'CEPEF - what we knew then and what we know now' given at the autumn meeting of the Association of Veterinary Anaesthetists in 2024, celebrating its 60th anniversary. Methods: (this is not a formal systematic review). PubMed, Scopus, Google Scholar and the 4th Confidential Enquiry into Equine Perioperative Fatalities (CEPEF4). Search terms used: horse; pony; equine; anaesthesia; anesthesia; recovery; morbidity and mortality. Conclusions: It is well recognized that general anaesthesia carries a greater risk of mortality in horses than in other domestic...
Infracyanine Green-Based Photodynamic Therapy for Immune-Mediated Keratitis in Horses.
Veterinary ophthalmology    May 5, 2025   doi: 10.1111/vop.70027
Lam KP, Keys DA, McMullen RJ.To describe infracyanine green-based photodynamic therapy (InfraCG-PDT) and evaluate outcomes in horses with immune-mediated keratitis (IMMK). Methods: Medical records from 2014 to 2020 from the Equine Clinic Munich-Riem, Germany, and Auburn University Equine Ophthalmology Service identified horses diagnosed with IMMK following ophthalmic examination that had undergone InfraCG-PDT. Methods: Multiple intrastromal injections of EmunDo (InfraCG, A.R.C. Laser, Nuernberg, Germany) within an affected quadrant or the entire cornea were treated with diffuse diode laser energy (FOX A.R.C., Laser, Nuern...
Standing repair of long frontal plane fractures of the proximal phalanx in UK Thoroughbred racehorses: A retrospective analysis of 13 fractures.
Equine veterinary journal    April 30, 2025   doi: 10.1111/evj.14521
Findley JA, Bladon BM, O'Neill HD.Sagittal plane fractures of the proximal phalanx (P1) are commonly observed in the UK Thoroughbred racehorse, with the technique and outcome following standing lag screw fixation widely reported. Long frontal plane P1 fractures propagating from the central third of the proximal articular surface occur less frequently, with information concerning repair methods and outcomes currently lacking. Objective: To describe a surgical technique for standing lag screw fixation of long frontal P1 fractures and report on post-operative performance in a UK Thoroughbred population. Methods: Single centre ret...
S. suis serotype 2 meningitis in a patient with horse contact in a Japanese stable: A case report.
Diagnostic microbiology and infectious disease    April 25, 2025   Volume 112, Issue 4 116868 doi: 10.1016/j.diagmicrobio.2025.116868
Oshida J, Ito H, Ubukata K, Takata M, Ohkusu K, Ohba S, Saida A, Nakamura S, Kobayashi D.Streptococcus suis is a Gram-positive zoonotic pathogen primarily associated with pigs, but its potential transmission from other animals remains unclear. We report a case of S. suis serotype 2 meningitis in a 56-year-old Filipino stable worker with no known contact with pigs but a history of direct exposure to horses. He presented with fever and persistent headache following a head injury sustained one month prior. Cerebrospinal fluid (CSF) analysis revealed bacterial meningitis, and blood and CSF cultures identified S. suis serotype 2. Despite appropriate antibiotic therapy, the patient deve...
Survey on outcomes of emergency standing caesarean section in equids.
Frontiers in veterinary science    April 24, 2025   Volume 12 1548978 doi: 10.3389/fvets.2025.1548978
de la Rebière de Pouyade G, Binard M, Deleuze S, Ponthier J.Standing caesarian section (C-section) in mares is poorly documented in the literature. It is reportedly straightforward to perform for veterinarians experienced in bovine practice and is more accessible and less expensive than recumbent techniques. The study aimed to create a survey to report the outcomes of in field C-section through a flank laparotomy with the mare standing under sedation. Unassigned: A survey was developed for field veterinarians practicing standing C-sections. Data were collected regarding the veterinarian's experience and practice type, details about the mare and the rea...