Our Team


Celia M. Marr


  • Medical Referrals
  • Internal Medicine
  • Cardiology
  • Neonatology
  • Clinical Referrals (Medicine)
  • Laboratory

RCVS Recognised Specialist in Equine Internal Medicine
European Veterinary Specialist in Equine Internal Medicine
Responsible for Internal Medicine, Cardiology

Celia joined the team at Rossdales Equine Hospital and Diagnostic Centre in 2003. She is a Specialist in Equine Internal Medicine and works with both inpatients and outpatients with medical problems. She was awarded a Fellowship by the Royal College of Veterinary Surgeons in 2016.

She graduated from the Glasgow University Veterinary School in 1985, then remained in Glasgow to complete both Masters and PhD degrees. She then held a Fulbright Scholarship studying equine cardiology and internal medicine at the New Bolton Center, University of Pennsylvania. Before joining Rossdales, she held positions at the University of Cambridge Veterinary School, Valley Equine Hospital, Lambourn and the Royal Veterinary College.

Her clinical and research interests are in Cardiovascular Medicine, Internal Medicine, Adult and Neonatal Intensive Care & Medical Imaging. She has published over 50 research papers and educational material relating to a range of medical disorders of the horse, concentrating on cardiovascular disease and diagnostic methods in medical disorders including editing a book on Cardiology of the Horse, the 2nd edition of which was published in 2010.

Celia is an Honorary Professor of the University of Glasgow and Editor-in-Chief of Equine Veterinary Journal.

Publications (66)

  • Cardiac and Respiratory Disease in Aged Horses
    (2016) Vet Clin North Am Equine Pract, 32 (2), 283-300. doi: 10.1016/j.cveq.2016.04.006. epub: Review, PubMed: 27329492 .
  • The effect of mare obesity and endocrine function on foal birthweight in Thoroughbreds
    Smith S, Marr CM, Dunnett C, Menzies-Gow NJ.
    (2016) Equine Vet J, doi: 10.1111/evj.12645. epub: Nov 8 [Epub ahead of print], PubMed: 27862248.
  • Indications, complications, and outcome of horses undergoing repeated celiotomy within 14 days after the first colic surgery: 95 cases (2005-2013).
    Dunkel B, Mair T, Marr CM, Carnwath J, Bolt DM
    (2015) J Am Vet Med Assoc, 246 (5), 540-6. doi: 10.2460/javma.246.5.540. PubMed: 25671287.
  • The Equine Neonatal Cardiovascular System in Health and Disease
    (2015) Vet Clin North Am Equine Pract, 51 (3), 545-65. doi: 10.1016/j.cveq.2015.09.005. epub: Review, PubMed: 26612747 .
  • Partial mandibular condylectomy and temporal bone resection for chronic, destructive, septic arthritis of the temporomandibular joint in a horse
    Barnett TP, Powell SE, 1009, Marr CM, Steven WN, Payne RJ
    (2014) Equine Vet Educ, 26 (2), 59-63.
  • Intraoperator, intraobserver and interoperator variability of echocardiographic measurements in healthy foals
    Slack J, Durandot MM, Belcher CN, Collins N, Palmer L, Ousey J, Birks EK, Marr CM
    (2012) Equine Vet J Suppl, 44 69-75. PubMed: 22594030.
  • The impact of birthweight on mare health and reproductive efficiency, and foal health and subsequent racing performance
    Whittaker S, Sullivan S, Auen S, Parkin TD, Marr CM
    (2012) Equine Vet J Suppl, 44 26-Sep. PubMed: 22594022.
  • Pneumocephalus in five horses.
    Dunkel B, Corley KT, Johnson AL, Witte TH, Leitch M, Marr CM, Weller R
    (2012) Equine Vet J, 7 epub: Epub ahead of print, PubMed: 23094967.
  • Characterization of the responses of equine digital veins and arteries to calcitonin gene-related peptide.
    Katz LM, Marr CM, Elliott J. .
    (2011) Am J Vet Res, 72 (7), 975-81. PubMed: 21728859.
  • Retrospective study of neurological signs and management of seven English horses with temporohyoid osteoarthropathy
    Palus V, Bladon B, Brazil T, Cherubini GB, Powell SE, Greet, TR, Marr CM
    (2011) Equine Vet Educ, epub: Epub ahead of print,
  • European outbreak of atypical myopathy in the autumn 2009.
    Van Galen, G, Amory, H, Busschers, E, Cassart, D, De Bruijn, M, Gerber, V, Keen, J. Lefere, L, Marcillaud Pitel, C, Marr CM, Muller, J-M, Pineau, X, Saegarman, C, Sanderson, C, Serteyb, D, Torfs, S, Unger, L, Verwilghen, D, Votion, D-M.
    (2010) J. Vet. Emerg. Crit. Care, 20 (5), 528-532.
  • Repeatability and reproducibility of the Obel grading system for equine laminitis
    Menzies-Gow NJ, Stevens KB, Sepulveda MF, Jarvis N, Marr CM
    (2010) Vet Rec, 167 (2), 52-5. PubMed: 20622203.
  • Epidemiological study of pasture-associated laminitis and concurrent risk factors in the South of England
    Menzies-Gow NJ, Katz LM, Barker KJ, Elliott J, De Brauwere MN, Jarvis N, Marr CM, Pfeiffer DU
    (2010) Vet Rec, 167 (18), 690-4. PubMed: 21257484.
  • Two-dimensional and M-mode echocardiographic findings in healthy Thoroughbred foals.
    Collins NM, Palmer L, Marr CM
    (2010) Aust Vet J, 88 (11), 428-33. PubMed: 20958282.
  • Severity and outcome of equine pasture-associated laminitis managed in first opinion practice in the UK
    Menzies-Gow NJ, Stevens K, Barr A, Camm I, Pfeiffer D, Marr CM
    (2010) Vet Rec, 167 (10), 364-9. PubMed: 20817896.
  • Effect of left-sided valvular regurgitation on mortality and causes of death among a population of middle-aged and older horses
    Stevens KB, Marr CM, Horn JN, Pfeiffer DU, Perkins JD, Bowen IM, Allan EJ, Campbell J, Elliott J
    (2009) Vet Rec, 164 (1), 06-Oct. PubMed: 19122214.
  • Novel oblique radiographic projection of the temporomandibular articulation of horses
    Ramzan P, Marr CM, Meehan J, Thompson A
    (2008) Vet Rec, 162 (22), 714-6. PubMed: 18515758.
  • Multinodular pulmonary fibrosis in five horses
    Wong DM, Belgrave RL, Williams KJ, Del Piero F, Alcott CJ, Bolin SR, Marr CM, Nolen-Walston R, Myers RK, Wilkins PA
    (2008) J Am Vet Med Assoc, 232 (6), 898-905. PubMed: 18341449.
  • Incisional complications following exploratory celiotomy: does an abdominal bandage reduce the risk?
    Smith LJ, Mellor DJ, Marr CM, Reid SW, Mair TS
    (2007) Equine Vet J, 39 (3), 277-83. PubMed: 17520982.
  • Repeatability of Doppler ultrasonographic measurement of equine digital blood flow
    Menzies-Gow NJ, Marr CM
    (2007) Vet Radiol Ultrasound, 48 (3), 281-5. PubMed: 17508518.
  • Platelets in equine recurrent airway obstruction
    Hammond A, Bailey SR, Marr CM, Cunningham FM
    (2007) Res Vet Sci, 82 (3), 332-4. PubMed: 17107696.
  • What is the likelihood that a horse treated for septic digital tenosynovitis will return to its previous level of athletic function?
    Smith LJ, Mellor DJ, Marr CM, Mair TS
    (2006) Equine Vet J, 38 (4), 337-41. PubMed: 16866201.
  • Pelvic vascular prospects for uterine transplantation
    Sieunarine K, Boyle DC, Corless DJ, Noakes DE, Ungar L, Marr CM, Lindsay I, Del Priore G, Smith JR
    (2006) Int Surg., 91 (4), 217-22. PubMed: 16967683.
  • Survey of cardiac arrhythmias during submaximal and maximal exercise in Thoroughbred racehorses
    (2005) Equine Vet J, 37 (3), 265-8. PubMed: 15892238.
  • Digital blood flow and plasma endothelin concentration in clinically endotoxemic horses
    Menzies-Gow NJ, Bailey SR, Stevens K, Katz L, Elliott J, Marr CM
    (2005) Am J Vet Res, 66 (4), 630-6. PubMed: 15900943.
  • Demonstration of regional differences in equine ventricular myocardial velocity in normal 2-year-old Thoroughbreds with Doppler tissue imaging
    Sepulveda MF, Perkins JD, Bowen IM, Marr CM
    (2005) Equine Vet J, 37 (3), 222-6. PubMed: 15892230.
  • In-vitro contraction of the equine aortic valve
    Bowen IM, Marr CM, Chester AH, Wheeler-Jones CP, Elliott J
    (2004) J Heart Valve Dis, 13 (4), 593-9. PubMed: 15311865.
  • What is the likelihood that Thoroughbred foals treated for septic arthritis will race?
    Smith LJ, Marr CM, Payne RJ, Stoneham SJ, Reid SW
    (2004) Equine Vet J, 36 (5), 452-6. PubMed: 15253089.
  • Endotoxin-induced digital vasoconstriction in horses: associated changes in plasma concentrations of vasoconstrictor mediators
    Menzies-Gow NJ, Bailey SR, Katz LM, Marr CM, Elliott J
    (2004) Equine Vet J, 36 (3), 273-8. PubMed: 15147137.
  • The effects of vasoactive amines found in the equine hindgut on digital blood flow in the normal horse
    Bailey SR, Menzies-Gow NJ, Marr CM, Elliott J
    (2004) Equine Vet J, 36 (3), 267-72. PubMed: 15147136.
  • Cardiac emergencies and problems of the critical care patient
    (2004) Vet Clin North Am Equine Pract, 20 (1), 217-30. PubMed: 15062466.
  • Current research and theories on the pathogenesis of acute laminitis in the horse
    Bailey SR, Marr CM, Elliott J
    (2004) Vet J, 167 (2), 129-42. PubMed: 14975387.
  • Characterisation of the response of equine digital arteries and veins to substance P
    Katz LM, Marr CM, Elliott J
    (2003) J Vet Pharmacol Ther, 26 (5), 361-8. PubMed: 14633189.
  • Characterization and comparison of the responses of equine digital arteries and veins to endothelin-1
    Katz LM, Marr CM, Elliott J
    (2003) Am J Vet Res, 64 (11), 1438-43. PubMed: 14620782.
  • Use of nuclear scintigraphy with 99mTc-HMPAO-labelled leucocytes to assess small intestinal malabsorption in 17 horses
    Menzies-Gow NJ, Weller R, Bowen IM, Corley KT, Livesey L, Weaver M, Marr CM
    (2003) Vet Rec, 153 (15), 457-62. PubMed: 14584575.
  • Equine hepatic disease: the effect of patient- and case-specific variables on risk and prognosis
    Smith MR, Stevens KB, Durham AE, Marr CM
    (2003) Equine Vet J, 35 (6), 549-52. PubMed: 14515953.
  • Retrospective analysis of historical, clinical, ultrasonographic, serum biochemical and haematological data in prognostic evaluation of equine liver disease
    Durham AE, Newton JR, Smith KC, Hillyer MH, Hillyer LL, Smith MR, Marr CM
    (2003) Equine Vet J, 35 (6), 542-7. PubMed: 14515952.
  • Development and application of a scoring system for prognostic evaluation of equine liver biopsies
    Durham AE, Smitht KC, Newton JR, Hillyer MH, Hillyer LL, Smith MR, Marr CM
    (2003) Equine Vet J, 35 (6), 534-40. PubMed: 14515951.
  • Seasonal changes in plasma concentrations of cecum-derived amines in clinically normal ponies and ponies predisposed to laminitis
    Bailey SR, Katz LM, Berhane Y, Samuels T, De Brauvere N, Marr CM, Elliott J
    (2003) Am J Vet Res, 64 (9), 1132-8. PubMed: 13677391.
  • Defining the clinically relevant questions that lead to the best evidence: what is evidence-based medicine?
    (2003) Equine Vet J, 35 (4), 333-6. PubMed: 12879997.
  • Identification and quantification of amines in the equine caecum
    Bailey SR, Marr CM, Elliott J
    (2003) Res Vet Sci, 74 (2), 113-8. PubMed: 12589734.
  • Density and binding characteristics of beta-adrenoceptors in the normal and failing equine myocardium
    Horn J, Bailey S, Berhane Y, Marr CM, Elliott J
    (2002) Equine Vet J, 34 (4), 411-6. PubMed: 12117116.
  • Advances in equine ultrasonography
    (2001) Vet Clin North Am Equine Pract, 17 (2), 305-17, vii. PubMed: 15658178.
  • Understanding the pathophysiology is the key to novel therapies for canine dilated cardiomyopathy
    Elliott J, Marr CM
    (2001) Vet J, 162 (3), 168-9. PubMed: 11681866.
  • Repeatability of diagnostic ultrasonography in the assessment of the equine superficial digital flexor tendon
    Pickersgill CH, Marr CM, Reid SW
    (2001) Equine Vet J, 33 (1), 33-7. PubMed: 11191607.
  • Functional and histopathological evidence of cardiac parasympathetic dysautonomia in equine grass sickness
    Perkins JD, Bowen IM, Else RW, Marr CM, Mayhew IG
    (2000) Vet Rec, 146 (9), 246-50. PubMed: 10737294.
  • Retrospective study of the relationships between age, inflammation and the isolation of bacteria from the lower respiratory tract of thoroughbred horses
    Chapman PS, Green C, Main JP, Taylor PM, Cunningham FM, Cook AJ, Marr CM
    (2000) Vet Rec, 146 (4), 91-5. PubMed: 10682693.
  • Pre- and post exercise echocardiography in horses performing treadmill exercise in cool and hot/humid conditions
    Marr CM, Bright JM, Marlin DJ, Harris PA, Roberts CA
    (1999) Equine Vet J Suppl, 30 131-136. PubMed: 10659237.
  • The use of scintigraphy in the diagnosis of aortic-iliac thrombosis in a horse
    Boswell JC, Marr CM, Cauvin ER, Schramme MC
    (1999) Equine Vet J, 31 (6), 537-41. PubMed: 10596939.
  • Thoracic oesophageal abscess in a pony
    Freeman SL, Bowen IM, Marr CM
    (1998) Vet Rec, 142 (25), 699-700. PubMed: 9670460.
  • Aorto-cardiac fistulas in seven horses
    Marr CM, Reef VB, Brazil TJ, Thomas WP, Knottenbelt DC, Kelly DF, Baker JR, Reimer JM, Maxson AD, Crowhurst JS
    (1998) Vet Radiol Ultrasound, 39 (1), 22-31. PubMed: 9491514.
  • Physiological responses in nonheat acclimated horses performing treadmill exercise in cool (20 degrees C/40% RH), hot dry (30 degrees C/40% RH) and hot humid (30 degrees C/80% RH) conditions
    Marlin DJ, Scott CM, Schroter RC, Mills PC, Harris RC, Harris PA, Orme CE, Roberts CA, Marr CM, Dyson SJ, Barrelet FE
    (1996) Equine Vet J Suppl, 22 70-84. PubMed: 8894553.
  • Electrolyte and total protein changes in nonheat acclimated horses performing treadmill exercise in cool (20 degrees C/40%RH), hot, dry (30 degrees C/40%RH) or hot, humid (30 degrees C/80%RH) conditions
    Harris PA, Marlin DJ, Scott CM, Harris RC, Mills PC, Michell AR, Orme CE, Roberts CA, Schroter RC, Marr CM, et al
    (1995) Equine Vet J Suppl, 20 85-96. PubMed: 8933090.
  • Clinical observations made in nonheat acclimated horses performing treadmill exercise in cool (20 degrees C/40%RH), hot, dry (30 degrees C/40%RH) or hot, humid (30 degrees C/80%RH) conditions
    Harris PA, Marlin DJ, Mills PC, Roberts CA, Scott CM, Harris RC, Orme CE, Schroter RC, Marr CM, Barrelet FE
    (1995) Equine Vet J Suppl, 20 78-84. PubMed: 8933089.
  • Physiological valvular regurgitation in clinically normal young racehorses: prevalence and two-dimensional colour flow Doppler echocardiographic characteristics
    Marr CM, Reef VB
    (1995) Equine Vet J Suppl, 19 56-62. PubMed: 8933070.
  • An echocardiographic study of atrial fibrillation in horses: before and after conversion to sinus rhythm
    Marr CM, Reef VB, Reimer JM, Sweeney RW, Reid SW
    (1995) J Vet Intern Med, 9 (5), 336-40. PubMed: 8531180.
  • Equine echocardiography--sound advice at the heart of the matter
    (1994) Br Vet J, 150 (6), 527-45. PubMed: 7850443.
  • Aortic origin of the right pulmonary artery and patent ductus arteriosus in a pony foal with pulmonary hypertension and right-sided heart failure
    Reimer JM, Marr CM, Reef VB, Saik JE
    (1993) Equine Vet J, 25 (5), 466-8. PubMed: 8223383.
  • Factors affecting the clinical outcome of injuries to the superficial digital flexor tendon in National Hunt and point-to-point racehorses
    Marr CM, Love S, Boyd JS, McKellar Q
    (1993) Vet Rec, 132 (19), 476-9. PubMed: 8506599.
  • Ultrasonographic and histopathological findings in equine superficial digital flexor tendon injury
    Marr CM, McMillan I, Boyd JS, Wright NG, Murray M
    (1993) Equine Vet J, 25 (1), 23-Sep. PubMed: 8422880.
  • Idiopathic, aseptic, effusive, fibrinous, nonconstrictive pericarditis with tamponade in a standardbred filly
    Robinson JA, Marr CM, Reef VB, Sweeney RW
    (1992) J Am Vet Med Assoc, 201 (10), 1593-8. PubMed: 1289343.
  • Microwave thermography: a non-invasive technique for investigation of injury of the superficial digital flexor tendon in the horse
    (1992) Equine Vet J, 24 (4), 269-73. PubMed: 1499533.
  • Aortic valvular dysplasia in a calf
    Watson TD, Marr CM, McCandlish IA
    (1991) Vet Rec, 129 (17), 380-2. PubMed: 1746115.
  • ECG of the month
    Marr CM, Reef VB
    (1991) J Am Vet Med Assoc, 198 (9), 1533-4. PubMed: 2061175.
  • Confirmation by Doppler echocardiography of valvular regurgitation in a horse with a ruptured chorda tendinea of the mitral valve
    Marr CM, Love S, Pirie HM, Northridge DB
    (1990) Vet Rec, 127 (15), 376-9. PubMed: 2260252.
  • Clinical, ultrasonographic and pathological findings in a horse with splenic lymphosarcoma and pseudohyperparathyroidism
    Marr CM, Love S, Pirie HM
    (1989) Equine Vet J, 21 (3), 221-6. PubMed: 2659317.
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