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Gosselin RC. From Field Study to Clinical Practice, a Personal Historical Experience Using the PFA-100 Analyzer for Platelet Function Testing. Semin Thromb Hemost 2024; 50:672-675. [PMID: 38122807 DOI: 10.1055/s-0043-1777795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2023]
Affiliation(s)
- Robert C Gosselin
- Thrombosis & Hemostasis Center, University of California, Davis Health System, Sacramento, California
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2
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Benjamin EJ, Nelson OL, Baumwart R, Haines J. Adverse effects of trazodone in dogs on primary hemostasis and electrocardiogram: A single-blinded placebo-controlled crossover study. J Vet Intern Med 2023; 37:2131-2136. [PMID: 37807949 PMCID: PMC10658541 DOI: 10.1111/jvim.16841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Accepted: 08/21/2023] [Indexed: 10/10/2023] Open
Abstract
BACKGROUND Trazodone is a serotonin antagonist/reuptake inhibitor medication commonly used for anxiety in dogs. Therapy with selective serotonin reuptake inhibitors in humans is associated with bleeding disorders and increased arrhythmogenesis. HYPOTHESIS/OBJECTIVES To evaluate markers of primary hemostasis and corrected QT (cQT) interval in dogs before and after oral administration of standard dosages of trazodone or placebo. ANIMALS Fifteen apparently healthy, client-owned dogs. METHODS A single-blinded, randomized placebo-controlled crossover study was performed. Dogs were administered trazodone (5 to 7.5 mg/kg PO Q12h) or placebo. [Correction added after first online publication on 14 October 2023. In the abstract (methods) section (57.5 mg/kg PO Q12h) changed as (5 to 7.5 mg/kg PO Q12h).] Buccal mucosal bleeding time (BMBT), platelet count, platelet aggregation via Plateletworks, PFA-100 closure time and cQT interval were measured. A Shapiro-Wilk test was performed followed by either a paired t test or a Wilcoxon signed-rank test. RESULTS No significant difference was detected in the BMBT, PFA-100 closure times, platelet counts, and cQT interval between trazodone or placebo. However, using Plateletworks, there was a significant decrease in platelet aggregation after administration of trazodone (95%; 81-97 vs 62%; 39-89, P = .002) and not placebo (95%; 81-97 vs 91%; 81-96, P = .21). CONCLUSIONS It is unknown if this represents a clinically relevant change or if dogs with preexisting impairment in primary hemostasis or receiving higher dosages or longer durations of trazodone could have a more substantial change in hemostatic variables.
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3
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Haginoya S, Thomovsky EJ, Johnson PA, Brooks AC. Clinical Assessment of Primary Hemostasis: A Review. Top Companion Anim Med 2023; 56-57:100818. [PMID: 37673175 DOI: 10.1016/j.tcam.2023.100818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2022] [Revised: 08/24/2023] [Accepted: 08/26/2023] [Indexed: 09/08/2023]
Abstract
Primary hemostatic disorders such as thrombocytopenia and thrombocytopathia are commonly encountered in small animal practice. The key stages of primary hemostasis include platelet adhesion, activation, and aggregation. Understanding the interaction between tissues, platelets, and signaling molecules not only helps clinicians comprehend clot formation but also better recognize thrombocytopathias. Although congenital thrombocytopathia is rare, commercially available platelet function tests allow veterinarians to narrow differentials in many clinical settings. Thrombocytopenia can be easily diagnosed in any clinical setting. In this paper, we review the current understanding of primary hemostasis in veterinary medicine, including the clinical presentation and available diagnostics to identify platelet abnormalities.
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Affiliation(s)
- Satoshi Haginoya
- Purdue University College of Veterinary Medicine, West Lafayette, IN, USA.
| | | | - Paula A Johnson
- Purdue University College of Veterinary Medicine, West Lafayette, IN, USA
| | - Aimee C Brooks
- Purdue University College of Veterinary Medicine, West Lafayette, IN, USA
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4
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Wilkinson A, Panciera D, DeMonaco S, Boes K, Leib M, Clapp K, Ruth J, Cecere T, McClendon D. Platelet function in dogs with chronic liver disease. J Small Anim Pract 2021; 63:120-127. [PMID: 33900656 DOI: 10.1111/jsap.13342] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Revised: 03/15/2021] [Accepted: 03/29/2021] [Indexed: 12/29/2022]
Abstract
OBJECTIVES To assess platelet function, buccal mucosal bleeding time and plasma von Willebrand factor concentration in dogs with chronic inflammatory and/or fibrotic liver disease and to compare results with those obtained in healthy dogs. MATERIALS AND METHODS Preliminary study including 18 dogs with chronic inflammatory and/or fibrotic liver disease undergoing liver biopsy and 18 healthy age-matched control dogs. Platelet function was assessed by measuring closure time with the PFA-100® analyser using adenosine diphosphate (ADP) as an agonist. Buccal mucosal bleeding time, closure time and plasma von Willebrand factor antigen were measured in dogs in both groups. After undergoing ultrasound-guided needle biopsy, dogs were monitored for haemorrhage to determine if there was an association of any measurement with post-biopsy bleeding. RESULTS The closure time was not different between the liver disease group (median 76.3; range 53 to 118.5 seconds) and control group (72.8; 57 to 89.5 seconds). The buccal mucosal bleeding time was longer in the liver disease group (median 138; range 95 to 229 seconds) than the control group (103; 63 to 200 seconds). The plasma von Willebrand factor antigen concentration was not different between the liver disease group (median 203; range 109 to 351%) and control group (165.5; 63 to 246%). CLINICAL SIGNIFICANCE In this study, dogs with chronic necroinflammatory and/or fibrotic liver disease did not have overt, clinically relevant derangements in platelet function as assessed by buccal mucosal bleeding time, closure time and von Willebrand factor analysis. In addition, none of the dogs undergoing percutaneous ultrasound-guided biopsy in the study exhibited bleeding complications post-biopsy procedure.
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Affiliation(s)
- A Wilkinson
- Department of Small Animal Clinical Sciences, Virginia-Maryland College of Veterinary Medicine, Blacksburg, VA, 24061, USA
| | - D Panciera
- Department of Small Animal Clinical Sciences, Virginia-Maryland College of Veterinary Medicine, Blacksburg, VA, 24061, USA
| | - S DeMonaco
- Department of Small Animal Clinical Sciences, Virginia-Maryland College of Veterinary Medicine, Blacksburg, VA, 24061, USA
| | - K Boes
- Department of Biomedical Sciences and Pathobiology, Virginia-Maryland College of Veterinary Medicine, Blacksburg, VA, 24061, USA
| | - M Leib
- Department of Small Animal Clinical Sciences, Virginia-Maryland College of Veterinary Medicine, Blacksburg, VA, 24061, USA
| | - K Clapp
- Department of Small Animal Clinical Sciences, Virginia-Maryland College of Veterinary Medicine, Blacksburg, VA, 24061, USA
| | - J Ruth
- Department of Small Animal Clinical Sciences, Virginia-Maryland College of Veterinary Medicine, Blacksburg, VA, 24061, USA
| | - T Cecere
- Department of Biomedical Sciences and Pathobiology, Virginia-Maryland College of Veterinary Medicine, Blacksburg, VA, 24061, USA
| | - D McClendon
- Department of Biomedical Sciences and Pathobiology, Virginia-Maryland College of Veterinary Medicine, Blacksburg, VA, 24061, USA
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5
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Iannucci C, Dirkmann D, Howard J, Adamik KN. A prospective randomized open-label trial on the comparative effects of 6% hydroxyethyl starch 130/0.4 versus polyionic isotonic crystalloids on coagulation parameters in dogs with spontaneous hemoperitoneum. J Vet Emerg Crit Care (San Antonio) 2020; 31:32-42. [PMID: 33108052 DOI: 10.1111/vec.13018] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2018] [Revised: 03/17/2019] [Accepted: 04/23/2019] [Indexed: 12/27/2022]
Abstract
OBJECTIVE To evaluate the effects of 6% hydroxyethyl starch 130/0.4 (HES) and a polyionic isotonic crystalloid (CRYS) on standard coagulation tests and rotational thromboelastometry (ROTEM) in dogs with spontaneous hemoperitoneum (SHP). DESIGN Prospective randomized open-label clinical study. SETTING University teaching hospital. ANIMALS Forty-two client-owned dogs presented with SHP. INTERVENTIONS Dogs diagnosed with SHP and hypovolemic shock were randomly allocated to receive HES (10 mL/kg, n = 22) or CRYS (30 mL/kg, n = 20) intravenously over 20 minutes for hemodynamic stabilization. MEASUREMENTS AND MAIN RESULTS Parameters measured before (T0 ) and after (T1 ) treatment were HCT, platelet counts, prothrombin time, activated partial thromboplastin time, fibrinogen concentrations, and extrinsic activated (EXTEM), intrinsic activated (INTEM), and extrinsic activated with platelet inhibition ROTEM assays. Data were analyzed as absolute values and as the percentage change from T0 to T1 . No significant differences between groups were detected in any variable at T0 , and for HCT, platelet counts, prothrombin time, activated thromboplastin time, and fibrinogen concentrations at T1 . Clot formation time in EXTEM was significantly prolonged (P = 0.037), and maximum clot firmness was significantly decreased (P = 0.038) in the HES group compared to the CRYS group at T1 . The percentage change in EXTEM clotting time (P = 0.012) and INTEM clot formation time (P = 0.031) was greater after HES than CRYS. Lysis indices remained at 100% for all ROTEM assays in both groups. CONCLUSION Compared to a 3-fold volume of CRYS, administration of HES was associated with impairment in ROTEM parameters in dogs with SHP, but no evidence of hyperfibrinolysis was detected.
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Affiliation(s)
- Claudia Iannucci
- Division of Small Animal Emergency and Critical Care, Department of Clinical Veterinary Medicine, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Daniel Dirkmann
- Clinic for Anesthesiology and Intensive Care, Essen University Hospital, Essen, Germany
| | - Judith Howard
- Clinical Diagnostic Laboratory, Department of Clinical Veterinary Medicine, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Katja N Adamik
- Division of Small Animal Emergency and Critical Care, Department of Clinical Veterinary Medicine, Vetsuisse Faculty, University of Bern, Bern, Switzerland
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6
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Thomason J, Mooney AP, Price JM, Whittemore JC. Effects of clopidogrel and prednisone on platelet function in healthy dogs. J Vet Intern Med 2020; 34:1198-1205. [PMID: 32246893 PMCID: PMC7255683 DOI: 10.1111/jvim.15759] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Accepted: 03/12/2020] [Indexed: 12/27/2022] Open
Abstract
Background Glucocorticoids cause hypercoagulability, but it is unknown if they counteract clopidogrel's antiplatelet effects. Hypothesis/Objectives Determine the effects of clopidogrel and prednisone on platelet function. Animals Twenty‐four healthy dogs. Methods Double‐blinded, placebo‐controlled randomized trial. Platelet function was evaluated using a platelet function analyzer and impedance aggregometry (days 0, 14, and 28) for dogs treated with placebo, clopidogrel (2‐3 mg/kg/d), prednisone (2 mg/kg/d), or prednisone with clopidogrel PO for 28 days. Results were categorized as nonresponder versus responder (platelet function analyzer), and inadequate, ideal, or excessive response (aggregometry). Results were compared using mixed model, split‐plot repeated measures analysis of variance and generalized estimating equation proportional odds models. P < .05 was considered significant. Results Closure times differed by treatment (F [3, 20] = 10.5; P < .001), time (F [2, 40] = 14.3; P < .001), and treatment‐by‐time (F [6, 40] = 3.4; P = .01). Area under the curve (AUC) differed by treatment (F [3, 20] = 19.6; P < .001), time (F [2, 40] = 35.4; P < .001), and treatment‐by‐time (F [6, 40] = 13.5; P < .001). Based on closure times, 5/6 dogs each in the clopidogrel and prednisone/clopidogrel groups were responders. All dogs in the prednisone/clopidogrel group were overcontrolled based on AUC (days 14 and 28), whereas 5/6 (day 14) and 2/6 (day 28) dogs treated with clopidogrel were overcontrolled. Compared to clopidogrel, dogs receiving prednisone/clopidogrel were 11 times (P = .03) more likely to have an excessive response. Conclusions and Clinical Importance Administration of clopidogrel/prednisone increases platelet dysfunction in healthy dogs.
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Affiliation(s)
- John Thomason
- The Department of Clinical Sciences, College of Veterinary Medicine, Mississippi State University, Mississippi State, Mississippi, USA
| | - Allison P Mooney
- The Department of Small Animal Clinical Sciences, University of Tennessee College of Veterinary Medicine, Knoxville, Tennessee, USA
| | - Joshua M Price
- The Office of Information Technology, University of Tennessee College of Veterinary Medicine, Knoxville, Tennessee, USA
| | - Jacqueline C Whittemore
- The Department of Small Animal Clinical Sciences, University of Tennessee College of Veterinary Medicine, Knoxville, Tennessee, USA
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7
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Thomason JM, Archer TM, Wills RW, Mackin AJ. Effects of immunosuppressive agents on the hemostatic system in normal dogs. J Vet Intern Med 2018; 32:1325-1333. [PMID: 29749651 PMCID: PMC6060322 DOI: 10.1111/jvim.15132] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2017] [Revised: 10/13/2017] [Accepted: 03/08/2018] [Indexed: 01/14/2023] Open
Abstract
Background In dogs, the effects of immunosuppressive medications on hemostasis are not well known. Hypothesis/Objectives The objective was to determine the effects of immunosuppressive medications on primary and secondary hemostasis. Our hypothesis was that cyclosporine and prednisone would increase markers of hypercoagulability and thromboxane synthesis, while azathioprine, mycophenolate mofetil, and leflunomide would have minimal effects on hemostasis. Animals Eight healthy dogs. Methods A randomized, cross‐over study used aggregometry, the PFA‐100 platelet function analyzer, viscoelastometry, platelet count, and prothrombin and activated partial thromboplastin times to evaluate hemostasis during the administration of prednisone, azathioprine, cyclosporine, mycophenolate mofetil, and leflunomide for 1 week each at standard oral doses. Urine 11‐dehydro‐thromboxane‐B2 (11‐dTXB2) and 6‐keto‐prostaglandin‐F1α (6‐keto‐PGF1α) concentrations, normalized to urine creatinine concentration, were measured. Results The aggregometry amplitude decreased from 51 ± 21 to 27 ± 14 (P = .002) during leflunomide treatment (ADP activation), but there were no differences in amplitude (P = .240) for any medications when platelets were activated with collagen. For all medications, there were no significant differences in viscoelastometry indices (ACT, P = .666; ClotRate, P = .340; and platelet function, P = .411) and platelet count (P = .552). Compared with pretreatment values, urinary 11‐dTXB2‐to‐creatinine ratio increased (P = .001) after drug administration (from 3.7 ± 0.6 to 5.6 ± 1.1). Cyclosporine was associated with an increase (P < .001) in the 6‐keto‐PGF1α‐to‐creatinine ratio (from 10.3 ± 4.6 to 22.1 ± 5.3). Conclusions and Clinical Importance Most immunosuppressive drugs do not enhance platelet function or coagulation in healthy dogs, suggesting that these medications might not predispose hypercoagulable dogs to thromboembolism. The results of our study need to be correlated with the clinical outcomes of hypercoagulable dogs.
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Affiliation(s)
- John M Thomason
- Department of Clinical Sciences, College of Veterinary Medicine, Mississippi State University, Mississippi State, Mississippi
| | - Todd M Archer
- Department of Clinical Sciences, College of Veterinary Medicine, Mississippi State University, Mississippi State, Mississippi
| | - Robert W Wills
- Department of Pathobiology and Population Medicine, College of Veterinary Medicine, Mississippi State University, Mississippi State, Mississippi
| | - Andrew J Mackin
- Department of Clinical Sciences, College of Veterinary Medicine, Mississippi State University, Mississippi State, Mississippi
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Saati S, Abrams‐Ogg A, Blois S, Wood R. Comparison of Multiplate, Platelet Function Analyzer-200, and Plateletworks in Healthy Dogs Treated with Aspirin and Clopidogrel. J Vet Intern Med 2018; 32:111-118. [PMID: 29194772 PMCID: PMC5787169 DOI: 10.1111/jvim.14886] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2017] [Revised: 09/23/2017] [Accepted: 10/23/2017] [Indexed: 01/24/2023] Open
Abstract
BACKGROUND Platelet function testing may be warranted to assess response to aspirin and clopidogrel. HYPOTHESIS/OBJECTIVES To evaluate the effects of aspirin, clopidogrel, or combination therapy using 3 platelet function tests: Multiplate Analyzer (MP), Platelet Function Analyzer-200 (PFA), and Plateletworks (PW). ANIMALS Six healthy laboratory Beagles. METHODS Randomized double-blind placebo-controlled study (crossover design). Dogs were given aspirin 1 mg/kg, clopidogrel 2 mg/kg, or combination therapy for 1 week each, with a washout period of 2 weeks. Platelet function was assessed on days 0 and 7 of each phase using MP (adenosine diphosphate [ADP], arachidonic acid [AA], collagen [COL] agonists), PFA (P2Y, COL-ADP [CADP], COL-Epinephrine [CEPI] cartridges), and PW (ADP, AA, COL agonists). Platelet counts were obtained with impedance and optical counters. RESULTS For MP, mean aggregation was decreased for COL and AA with combination therapy and for ADP with all treatments. For PFA, mean CT was increased for the CEPI cartridge with aspirin; and for the P2Y and CADP cartridges with clopidogrel or combination therapy. More dogs receiving clopidogrel showed an increase in PFA CT using the P2Y than the CADP cartridge. For PW, mean aggregation was decreased for AA with all treatments; for ADP with clopidogrel or combination therapy; and for COL with clopidogrel. The PW results with the 2 hematology counters showed almost perfect agreement. CONCLUSION AND CLINICAL IMPORTANCE All platelet function tests detected treatment effects in some dogs and may have utility for monitoring therapy.
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Affiliation(s)
- S. Saati
- Department of Clinical StudiesOntario Veterinary CollegeUniversity of GuelphGuelphONCanada
| | - A.C.G. Abrams‐Ogg
- Department of Clinical StudiesOntario Veterinary CollegeUniversity of GuelphGuelphONCanada
| | - S.L. Blois
- Department of Clinical StudiesOntario Veterinary CollegeUniversity of GuelphGuelphONCanada
| | - R.D. Wood
- Department of PathobiologyOntario Veterinary CollegeUniversity of GuelphGuelphONCanada
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Li H, Han D, Pauletti GM, Steckl AJ. Engineering a simple lateral flow device for animal blood coagulation monitoring. BIOMICROFLUIDICS 2018; 12:014110. [PMID: 29430275 PMCID: PMC5780276 DOI: 10.1063/1.5017496] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Accepted: 01/10/2018] [Indexed: 05/04/2023]
Abstract
Increasing numbers of animals are diagnosed with thromboembolism, requiring anticoagulation treatment to prevent thrombotic events. Frequent and periodic coagulation monitoring is critical to ensure treatment effectiveness and patient safety by limiting blood coagulation ability within the desired therapeutic range. Point-of-care diagnostics is an ideal candidate for frequent coagulation monitoring due to rapid test results and no need for laboratory setting. This article reports the first utilization of no-reaction lateral flow assay (nrLFA) device for simple and low-cost animal blood coagulation monitoring in resource-limited setting. The nrLFA device consists of sample pad, analytical membrane and wicking pad, without conjugate pad, reagent printing or membrane drying. Citrated and heparinized animal blood were utilized to mimic different blood coagulation abilities in vitro by adding reversal agents CaCl2 and protamine sulfate. The travel distance of red blood cells (RBCs) on the nrLFA after a pre-determined test time serves as endpoint marker. Upon adding 500 mM CaCl2 solution to citrated bovine, canine, rabbit and equine blood, the average travel distance decreases from 10.9 to 9.4 mm, 8.8 to 5.7 mm, 12.6 to 9 mm, and 15.3 to 11.3 mm, respectively. For heparinized bovine and rabbit blood, the average distance decreases from 14.5 to 11.4 mm and from 9.8 to 7.2 mm, respectively, when adding 300 mg/l protamine sulfate solution. The effect of hematocrit on RBC travel distance in the nrLFA was also investigated. The nrLFA device will potentially improve treatment efficiency, patient safety, quality of life, and satisfaction for both animal patients and their owners.
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Affiliation(s)
- Hua Li
- Nanoelectronics Laboratory, Department of Electrical Engineering and Computing Systems, University of Cincinnati, Cincinnati, Ohio 45221, USA
| | - Daewoo Han
- Nanoelectronics Laboratory, Department of Electrical Engineering and Computing Systems, University of Cincinnati, Cincinnati, Ohio 45221, USA
| | - Giovanni M Pauletti
- Winkle College of Pharmacy, University of Cincinnati, Cincinnati, Ohio 45267, USA
| | - Andrew J Steckl
- Nanoelectronics Laboratory, Department of Electrical Engineering and Computing Systems, University of Cincinnati, Cincinnati, Ohio 45221, USA
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Westgarth S, Blois SL, D. Wood R, Verbrugghe A, Ma DW. Effects of omega-3 polyunsaturated fatty acids and aspirin, alone and combined, on canine platelet function. J Small Anim Pract 2017; 59:272-280. [DOI: 10.1111/jsap.12776] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Revised: 07/10/2017] [Accepted: 08/03/2017] [Indexed: 11/29/2022]
Affiliation(s)
- S. Westgarth
- Department of Clinical Studies; University of Guelph; Guelph Ontaria N1G 2W1 Canada
| | - S. L. Blois
- Department of Clinical Studies; University of Guelph; Guelph Ontaria N1G 2W1 Canada
| | - R. D. Wood
- Department of Pathobiology; University of Guelph; Guelph Ontaria N1G 2W1 Canada
| | - A. Verbrugghe
- Department of Clinical Studies; University of Guelph; Guelph Ontaria N1G 2W1 Canada
| | - D. W. Ma
- Department of Human Health and Nutritional Sciences; University of Guelph; Guelph Ontaria N1G 2W1 Canada
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11
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McLewee N, Archer T, Wills R, Mackin A, Thomason J. Effects of aspirin dose escalation on platelet function and urinary thromboxane and prostacyclin levels in normal dogs. J Vet Pharmacol Ther 2017; 41:60-67. [DOI: 10.1111/jvp.12432] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Accepted: 06/01/2017] [Indexed: 01/04/2023]
Affiliation(s)
- N. McLewee
- Department of Clinical Sciences; College of Veterinary Medicine; Mississippi State University; Mississippi MS USA
| | - T. Archer
- Department of Clinical Sciences; College of Veterinary Medicine; Mississippi State University; Mississippi MS USA
| | - R. Wills
- Department of Pathobiology and Population Medicine; College of Veterinary Medicine; Mississippi State University; Mississippi MS USA
| | - A. Mackin
- Department of Clinical Sciences; College of Veterinary Medicine; Mississippi State University; Mississippi MS USA
| | - J. Thomason
- Department of Clinical Sciences; College of Veterinary Medicine; Mississippi State University; Mississippi MS USA
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12
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Yozova ID, Howard J, Henke D, Dirkmann D, Adamik KN. Comparison of the effects of 7.2% hypertonic saline and 20% mannitol on whole blood coagulation and platelet function in dogs with suspected intracranial hypertension - a pilot study. BMC Vet Res 2017; 13:185. [PMID: 28629456 PMCID: PMC5477108 DOI: 10.1186/s12917-017-1108-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2016] [Accepted: 06/12/2017] [Indexed: 01/15/2023] Open
Abstract
BACKGROUND Hyperosmolar therapy with either mannitol or hypertonic saline (HTS) is commonly used in the treatment of intracranial hypertension (ICH). In vitro data indicate that both mannitol and HTS affect coagulation and platelet function in dogs. The aim of this study was to compare the effects of 20% mannitol and 7.2% HTS on whole blood coagulation using rotational thromboelastometry (ROTEM®) and platelet function using a platelet function analyzer (PFA®) in dogs with suspected ICH. Thirty client-owned dogs with suspected ICH needing osmotherapy were randomized to receive either 20% mannitol (5 ml/kg IV over 15 min) or 7.2% HTS (4 ml/kg IV over 5 min). ROTEM® (EXTEM® and FIBTEM® assays) and PFA® analyses (collagen/ADP cartridges) were performed before (T0), as well as 5 (T5), 60 (T60) and 120 (T120) minutes after administration of HTS or mannitol. Data at T5, T60 and T120 were analyzed as a percentage of values at T0 for comparison between groups, and as absolute values for comparison between time points, respectively. RESULTS No significant difference was found between the groups for the percentage change of any parameter at any time point except for FIBTEM® clotting time. Within each group, no significant difference was found between time points for any parameter except for FIBTEM® clotting time in the HTS group, and EXTEM® and FIBTEM® maximum clot firmness in the mannitol group. Median ROTEM® values lay within institutional reference intervals in both groups at all time points, whereas median PFA® values were above the reference intervals at T5 (both groups) and T60 (HTS group). CONCLUSIONS Using currently recommended doses, mannitol and HTS do not differ in their effects on whole blood coagulation and platelet function in dogs with suspected ICH. Moreover, no relevant impairment of whole blood coagulation was found following treatment with either solution, whereas a short-lived impairment of platelet function was found after both solutions.
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Affiliation(s)
- Ivayla D. Yozova
- Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Private Bag 11-222, Palmerston North, 4442 New Zealand
| | - Judith Howard
- Clinical Diagnostic Laboratory, Department of Clinical Veterinary Medicine, Vetsuisse Faculty, University of Bern, Laenggassstrasse 124, 3012 Bern, Switzerland
| | - Diana Henke
- Division of Neurological Sciences, Vetsuisse Faculty, University of Bern, Laenggassstrasse 128, 3012 Bern, Switzerland
| | - Daniel Dirkmann
- Clinic for Anesthesiology and Intensive Care, Essen University Hospital, Hufelandstraße 55, 45122 Essen, Germany
| | - Katja N. Adamik
- Division of Small Animal Emergency and Critical Care, Department of Clinical Veterinary Medicine, Vetsuisse Faculty, University of Bern, Laenggassstrasse 128, 3012 Bern, Switzerland
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13
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Dudley A, Byron JK, Burkhard MJ, Warry E, Guillaumin J. Comparison of platelet function and viscoelastic test results between healthy dogs and dogs with naturally occurring chronic kidney disease. Am J Vet Res 2017; 78:589-600. [DOI: 10.2460/ajvr.78.5.589] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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14
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Reuteler A, Axiak-Flammer S, Howard J, Adamik KN. Comparison of the effects of a balanced crystalloid-based and a saline-based tetrastarch solution on canine whole blood coagulation and platelet function. J Vet Emerg Crit Care (San Antonio) 2016; 27:23-34. [PMID: 27926787 DOI: 10.1111/vec.12556] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2015] [Revised: 05/03/2015] [Accepted: 06/14/2015] [Indexed: 01/14/2023]
Abstract
OBJECTIVE To evaluate the effects of a 6% hydroxyethyl starch (130/0.42) solution in either a buffered, electrolyte-balanced (HES-BAL), or a saline (HES-SAL) carrier solution on canine platelet function and whole blood coagulation. DESIGN Prospective, randomized study. SETTING University teaching hospital. ANIMALS Thirty-seven client-owned dogs undergoing general anesthesia for arthroscopy or imaging studies. INTERVENTIONS Dogs received a 15 mL/kg intravenous bolus of HES-SAL (n = 13), HES-BAL (n = 14), or a modified Ringer's solution (n = 10) over 30-40 minutes. Coagulation was analyzed using a Platelet Function Analyzer-100 (closure time [CtPFA ]), and whole blood thromboelastometry (ROTEM) with extrinsically (ex-tem and fib-tem) and intrinsically (in-tem) activated assays, which assessed clotting time (CT), clot formation time (CFT), maximal clot firmness (MCF), and lysis index (LI). Coagulation samples were assayed prior to fluid administration (T0), and 5 minutes (T1), and 3 hours (T2) following fluid bolus administration, respectively. RESULTS Both HES solutions resulted in impaired platelet function as indicated by a significant prolongation of CtPFA at T1 as compared to T0, but which resolved by T2. An IV bolus of Ringer's solution did not alter platelet function. In both HES groups, whole blood coagulation was significantly impaired at T1 as indicated by a significant increase in in-tem CFT, and a significant decrease in ex-tem, in-tem, and fib-tem MCF compared to T0. Furthermore, a significant increase in ex-tem CFT at T1 compared to T0 was found in the HES-SAL group. With the exception of in-tem MCF after HES-BAL, these effects were not present at T2. No significant differences were found in CtPFA or any ROTEM variable at any time point between HES-SAL and HES-BAL. CONCLUSION Administration of a single bolus of 15 mL/kg 6% HES 130/0.42 results in significant but short-lived impairment of canine platelet function and whole blood coagulation, regardless of carrier solution.
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Affiliation(s)
- Annina Reuteler
- Sections of Small Animal Emergency and Critical Care, Department of Clinical Veterinary Medicine, University of Bern, Bern, Switzerland
| | - Shannon Axiak-Flammer
- Anesthesia, Department of Clinical Veterinary Medicine, University of Bern, Bern, Switzerland
| | - Judith Howard
- the Diagnostic Clinical Laboratory, Department of Clinical Veterinary Medicine, University of Bern, Bern, Switzerland
| | - Katja-Nicole Adamik
- Sections of Small Animal Emergency and Critical Care, Department of Clinical Veterinary Medicine, University of Bern, Bern, Switzerland
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15
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Griego-Valles M, Buriko Y, Prittie JE, Fox PR. An in vitro comparison of the effects of voluven (6% hydroxyethyl starch 130/0.4) and hespan (6% hydroxyethyl starch 670/0.75) on measures of blood coagulation in canine blood. J Vet Emerg Crit Care (San Antonio) 2016; 27:44-51. [PMID: 27712013 DOI: 10.1111/vec.12541] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Revised: 03/24/2015] [Accepted: 04/11/2015] [Indexed: 12/01/2022]
Abstract
OBJECTIVE To assess primary and secondary hemostasis following in vitro dilution of canine whole blood (WB) with hydroxyethyl starch (HES) 130/0.4 and HES 670/0.75. DESIGN In vitro experimental study. SETTING Private practice, teaching hospital. ANIMALS Twenty-five healthy dogs. INTERVENTIONS Each dog underwent venipuncture and 18 mL of venous blood was sampled once. MEASUREMENTS AND MAIN RESULTS Collected blood was separated in 4 aliquots. Aliquot A served as baseline sample. The remaining tubes of WB were diluted with 0.9% saline, HES 670/0.75 and HES 130/0.4 at a ratio of 1:5.5. Dilutional effects were evaluated using prothrombin time (PT), activated partial thromboplastin time (aPTT), packed cell volume (PCV), thromboelastography (TEG), and platelet closure time (Ct), which was measured using a platelet function analyzer (PFA). Clot strength (ie, G value) was calculated from measured TEG values. Significant increases in PT (P < 0.05) and aPTT (P < 0.05) were documented following WB dilution with saline. Dilution of WB with HES 670/0.75 and HES 130/0.4 resulted in significant hypocoagulable changes in K, MA and G (P < 0.05) compared to baseline and saline. When comparing saline to HES 670/0.75, both R and K values were significantly increased (P < 0.05). K value was significantly increased (P < 0.05) when comparing baseline to HES 130/0.4 and HES 670/0.75. Ct (P < 0.05) was significantly prolonged after WB dilution with HES solutions but not after saline. CONCLUSIONS Dilution of WB with HES 670/0.75 and HES 130/0.4 resulted in changes in primary and secondary hemostasis. Although there were small differences between saline and HES 670/0.75, no differences between HES solutions were evident in this small study. This may suggest there would be minimal increases in bleeding risk when either solution is administered to dogs at low doses. Clinical relevance of our findings requires further investigation.
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Affiliation(s)
- Michelle Griego-Valles
- Department of Emergency and Critical Care, The Animal Medical Center, New York, NY, 10065
| | - Yekaterina Buriko
- Department of Emergency and Critical Care, The Animal Medical Center, New York, NY, 10065
| | - Jennifer E Prittie
- Department of Emergency and Critical Care, The Animal Medical Center, New York, NY, 10065
| | - Philip R Fox
- Department of Emergency and Critical Care, The Animal Medical Center, New York, NY, 10065
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16
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Teuber M, Mischke R. Influence of a low dosage of clopidogrel on platelet function in cats as measured by the platelet function analyser PFA-100 and the multiplate analyser. Res Vet Sci 2016; 109:149-156. [PMID: 27892864 DOI: 10.1016/j.rvsc.2016.09.011] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2016] [Revised: 09/13/2016] [Accepted: 09/16/2016] [Indexed: 10/21/2022]
Abstract
The antiplatelet drug clopidogrel is widely used for prophylaxis of arterial thromboses in cats in a standard dosage of 18.75mg per cat once daily. The aim of the study was to verify if a reduced daily dose of 10mg clopidogrel per cat has a similar antiplatelet effect as the standard dosage. Platelet function was measured with the platelet function analyser PFA-100® and a novel impedance aggregometer. Suitability of the platelet function analyser was tested in citrated blood samples of 59 healthy cats and reference ranges were established. In addition, agonist concentrations for impedance aggregometry were optimised. In the main experiment two groups of 6 healthy cats received clopidogrel either in a dosage of 10 or 18.75mg per cat over a period of seven days. Analyses were performed on days 1, 2, 3, 5, and 7. In comparison to baseline both clopidogrel dosages showed an inhibitory effect on results of the platelet function analyser and velocity of ADP-induced platelet aggregation. Values at all times were different from baseline, with the exception of day 1 in cats receiving 10mg clopidogrel where the closure time of the platelet function analysis and part of ADP-induced aggregation did not show a significant difference. Significant differences were not found between the two doses. In conclusion, our study indicates that 10mg clopidogrel per day may be as effective as 18.75mg although the latter may be advantageous as an initial loading dosage to achieve effective levels more rapidly.
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Affiliation(s)
- M Teuber
- Small Animal Clinic, University of Veterinary Medicine Foundation, Bünteweg 9, D-30559 Hannover, Germany
| | - R Mischke
- Small Animal Clinic, University of Veterinary Medicine Foundation, Bünteweg 9, D-30559 Hannover, Germany.
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17
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Thames BE, Lovvorn J, Papich MG, Wills R, Archer T, Mackin A, Thomason J. The effects of clopidogrel and omeprazole on platelet function in normal dogs. J Vet Pharmacol Ther 2016; 40:130-139. [PMID: 27452307 DOI: 10.1111/jvp.12340] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Accepted: 05/24/2016] [Indexed: 12/12/2022]
Abstract
Omeprazole is used concurrently with clopidogrel to reduce gastrointestinal adverse effects. In humans, the concurrent use of these two drugs can reduce the antiplatelet efficacy of clopidogrel. Our objective was to determine the effects of omeprazole and clopidogrel on platelet function in healthy dogs. A crossover study utilized turbidimetric aggregometry (ADP and collagen) and the PFA-100® with the collagen/ADP cartridge to evaluate platelet function in eight healthy dogs during the administration of clopidogrel (1 mg/kg/24 h p.o.), omeprazole (1 mg/kg/24 h p.o.), and a combination of clopidogrel and omeprazole. Drug metabolite concentrations were also measured. Compared to pretreatment, on Days 3 and 5, with ADP as the agonist, there was a significant decrease in maximum amplitude on aggregometry for both clopidogrel and clopidogrel/omeprazole groups. The following revealed no significant differences between clopidogrel and clopidogrel/omeprazole groups when compared on Days 3 and 5: maximum amplitude on aggregometry with ADP or collagen agonists, and PFA-100® closure times. When compared to the clopidogrel group, clopidogrel metabolite concentrations in the clopidogrel/omeprazole group were significantly higher on Days 3 and 5. The concurrent administration of omeprazole and clopidogrel in healthy dogs was associated with an increase in the plasma concentration of an inactive metabolite of clopidogrel, but does not significantly alter the antiplatelet effects of clopidogrel.
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Affiliation(s)
- B E Thames
- Department of Clinical Sciences, College of Veterinary Medicine, Mississippi State University, Mississippi State, MS, USA
| | - J Lovvorn
- Department of Clinical Sciences, College of Veterinary Medicine, Mississippi State University, Mississippi State, MS, USA
| | - M G Papich
- Department of Molecular Biomedical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC, USA
| | - R Wills
- Departments of Pathobiology and Population Medicine, College of Veterinary Medicine, Mississippi State University, Mississippi State, MS, USA
| | - T Archer
- Department of Clinical Sciences, College of Veterinary Medicine, Mississippi State University, Mississippi State, MS, USA
| | - A Mackin
- Department of Clinical Sciences, College of Veterinary Medicine, Mississippi State University, Mississippi State, MS, USA
| | - J Thomason
- Department of Clinical Sciences, College of Veterinary Medicine, Mississippi State University, Mississippi State, MS, USA
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18
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Hyatt CE, Brainard BM. Point of Care Assessment of Coagulation. Top Companion Anim Med 2016; 31:11-7. [PMID: 27451044 DOI: 10.1053/j.tcam.2016.05.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Accepted: 05/19/2016] [Indexed: 11/11/2022]
Abstract
Disorders of hemostasis can be difficult to fully elucidate but can severely affect patient outcome. The optimal therapy for coagulopathies is also not always clear. Point of care (POC) testing in veterinary medicine can assist in the diagnosis of hemostatic disorders and also direct treatment. Advantages of POC testing include rapid turnaround times, ease of use, and proximity to the patient. Disadvantages include differences in analytic performance compared with reference laboratory devices, the potential for operator error, and limited test options per device. Conventional coagulation tests such as prothrombin time, activated partial thromboplastin time, and activated clotting time can be measured by POC devices and can accurately diagnose hypocoagulability, but they cannot detect hypercoagulability or disorders of fibrinolysis. Viscoelastic POC coagulation testing more accurately evaluates in vivo coagulation, and can detect hypocoagulability, hypercoagulability, and alterations in fibrinolysis. POC platelet function testing methodologies can detect platelet adhesion abnormalities including von Willebrand disease, and can be used to monitor the efficacy of antiplatelet drugs. It is unlikely that a single test would be ideal for assessing the complete coagulation status of all patients; therefore, the ideal combination of tests for a specific patient needs to be determined based on an understanding of the underlying disease, and protocols must be standardized to minimize interoperator and interinstitutional variability.
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Affiliation(s)
- Clare E Hyatt
- Phoenix Veterinary Referral and Emergency, Phoenix, AZ, USA
| | - Benjamin M Brainard
- Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Georgia, Athens, GA, USA.
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19
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Thomason J, Archer T, Wills R, Press S, Mackin A. The Effects of Cyclosporine and Aspirin on Platelet Function in Normal Dogs. J Vet Intern Med 2016; 30:1022-30. [PMID: 27156005 PMCID: PMC5084737 DOI: 10.1111/jvim.13960] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Revised: 03/22/2016] [Accepted: 04/14/2016] [Indexed: 11/29/2022] Open
Abstract
Background Cyclosporine increases thromboxane synthesis in dogs, potentially increasing the thrombogenic properties of platelets. Hypothesis/Objectives Our hypothesis was that the concurrent administration of low‐dose aspirin and cyclosporine would inhibit cyclosporine‐associated thromboxane synthesis without altering the antiplatelet effects of aspirin. The objective was to determine the effects of cyclosporine and aspirin on primary hemostasis. Animals Seven healthy dogs. Methods A randomized, crossover study utilized turbidimetric aggregometry and a platelet function analyzer to evaluate platelet function during the administration of low‐dose aspirin (1 mg/kg PO q24h), high‐dose aspirin (10 mg/kg PO q12h), cyclosporine (10 mg/kg PO q12h), and combined low‐dose aspirin and cyclosporine. The urine 11‐dehydro‐thromboxane‐B2 (11‐dTXB2)‐to‐creatinine ratio also was determined. Results On days 3 and 7 of administration, there was no difference in the aggregometry amplitude or the platelet function analyzer closure time between the low‐dose aspirin group and the combined low‐dose aspirin and cyclosporine group. On day 7, there was a significant difference in amplitude and closure time between the cyclosporine group and the combined low‐dose aspirin and cyclosporine group. High‐dose aspirin consistently inhibited platelet function. On both days, there was a significant difference in the urinary 11‐dTXB2‐to‐creatinine ratio between the cyclosporine group and the combined low‐dose aspirin and cyclosporine group. There was no difference in the urinary 11‐dTXB2‐to‐creatinine ratio among the low‐dose aspirin, high‐dose aspirin, and combined low‐dose aspirin and cyclosporine groups. Conclusions and Clinical Importance Low‐dose aspirin inhibits cyclosporine‐induced thromboxane synthesis, and concurrent use of these medications does not alter the antiplatelet effects of aspirin.
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Affiliation(s)
- J Thomason
- Department of Clinical Sciences, College of Veterinary Medicine, Mississippi State University, MS, 39762-6100
| | - T Archer
- Department of Clinical Sciences, College of Veterinary Medicine, Mississippi State University, MS, 39762-6100
| | - R Wills
- Department of Pathobiology and Population Medicine, College of Veterinary Medicine, Mississippi State University, MS, 39762-6100
| | - S Press
- Department of Clinical Sciences, College of Veterinary Medicine, Mississippi State University, MS, 39762-6100
| | - A Mackin
- Department of Clinical Sciences, College of Veterinary Medicine, Mississippi State University, MS, 39762-6100
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20
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McBride D, Hosgood G, Raisis A, Smart L. Platelet closure time in anesthetized Greyhounds with hemorrhagic shock treated with hydroxyethyl starch 130/0.4 or 0.9% sodium chloride infusions. J Vet Emerg Crit Care (San Antonio) 2016; 26:509-15. [PMID: 27002312 DOI: 10.1111/vec.12468] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2014] [Revised: 11/04/2014] [Accepted: 11/04/2014] [Indexed: 12/16/2022]
Abstract
OBJECTIVE To measure platelet closure time (PCT) in dogs during controlled hemorrhagic shock and after fluid resuscitation with hydroxyethyl starch (HES) 130/0.4 or 0.9% sodium chloride. DESIGN Experimental interventional study. SETTING University veterinary teaching hospital. ANIMALS Eleven healthy Greyhounds. INTERVENTIONS Dogs were anesthetized and had 48 mL/kg of blood removed to induce hemorrhagic shock. Dogs received 20 mL/kg of HES 130/0.4 (n = 6) or 80 mL/kg of 0.9% sodium chloride (NaCl; n = 5) intravenously over 20 minutes. PCT was measured using the Platelet Function Analyzer-100 with collagen and adenosine-diphosphate cartridges at: T0 = 60 minutes after induction of anesthesia prior to hemorrhage, T1 = during hemorrhagic shock, and T2 = 40 minutes after completion of fluid bolus. Packed cell volume and platelet count were concurrently measured. MEASUREMENT AND MAIN RESULTS Hemorrhagic shock did not significantly change PCT, with no difference between T0 and T1. Both the HES 130/0.4 and 0.9% NaCl group had a significantly increased mean PCT at T2 of 91.4 seconds (95% CI 69.3-113.4) and 95.5 seconds (95% CI 78.2-112.8), respectively, compared to T1. The magnitude of change was significantly greater for the 0.9% NaCl group than the HES 130/0.4 group. There was no difference in the magnitude of change in PCV and platelet count between the 2 groups. The PCV and platelet count were >25% and >100,000/μL, respectively, in all dogs, except for dogs in the HES 130/0.4 group at T2 where platelet counts were <100,000/μL. CONCLUSION Controlled hemorrhagic shock in Greyhounds under anesthesia did not cause a significant change in PCT. Both HES 130/0.4 and 0.9% NaCl administration after induction of shock increased PCT. These results do not support that HES 130/0.4 causes relevant platelet dysfunction beyond hemodilution.
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Affiliation(s)
- Duana McBride
- Department of Clinical Sciences and Service, The Royal Veterinary College, University of London, North Mymms, Hertfordshire, UK
| | - Giselle Hosgood
- Department of Clinical Sciences and Service, The Royal Veterinary College, University of London, North Mymms, Hertfordshire, UK
| | - Anthea Raisis
- Department of Clinical Sciences and Service, The Royal Veterinary College, University of London, North Mymms, Hertfordshire, UK
| | - Lisa Smart
- School of Veterinary and Life Sciences, College of Veterinary Medicine, Murdoch University, Murdoch Drive, Western Australia, Australia
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21
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Thomason J, Lunsford K, Mackin A. Anti-platelet therapy in small animal medicine. J Vet Pharmacol Ther 2016; 39:318-35. [DOI: 10.1111/jvp.12301] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Accepted: 01/29/2016] [Indexed: 01/29/2023]
Affiliation(s)
- J. Thomason
- Department of Clinical Sciences; College of Veterinary Medicine; Mississippi State University; Mississippi State MS USA
| | - K. Lunsford
- Department of Clinical Sciences; College of Veterinary Medicine; Mississippi State University; Mississippi State MS USA
| | - A. Mackin
- Department of Clinical Sciences; College of Veterinary Medicine; Mississippi State University; Mississippi State MS USA
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22
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Haines JM, Thomason JM, Seage EC, Wills RW, Bulla C, Lunsford KV, Mackin AJ. In vitro and in vivo assessment of platelet function in healthy dogs during administration of a low-dose aspirin regimen. Am J Vet Res 2016; 77:174-85. [DOI: 10.2460/ajvr.77.2.174] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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23
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Adamik KN, Butty E, Howard J. In vitro effects of 3% hypertonic saline and 20% mannitol on canine whole blood coagulation and platelet function. BMC Vet Res 2015; 11:242. [PMID: 26403081 PMCID: PMC4582639 DOI: 10.1186/s12917-015-0555-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2015] [Accepted: 09/17/2015] [Indexed: 12/11/2022] Open
Abstract
Background Hyperosmolar therapy, using either mannitol or hypertonic saline (HTS), is considered the treatment of choice for intracranial hypertension. However, hyperosmolar agents may impair coagulation and platelet function, limiting their use in patients at risk for hemorrhage. Despite this, studies evaluating the effects of mannitol compared to other hyperosmolar agents in dogs are largely lacking. The aim of this study was to compare the in vitro effects on global hemostasis and platelet function of 20 % mannitol and 3 % HTS on canine blood. Methods Citrated whole blood from 15 healthy dogs was diluted with 0.9 % saline, 20 % mannitol and 3 % HTS in ratios of 1:16 and 1:8. Rotational thromboelastometry (ROTEM) was used to assess clotting time (CT), clot formation time (CFT) and maximal clot firmness (MCF) following extrinsic activation (Ex-tem) and after platelet inhibition (Fib-tem). A platelet function analyzer (PFA-100) was used to assess closure time (CtPFA). Results No significant differences were observed between untreated whole blood and samples diluted with saline. Samples diluted with both mannitol and HTS were hypocoagulable compared to untreated whole blood samples. At a dilution of 1:16, no significant differences were found between any measured parameter in samples diluted with saline compared to mannitol or HTS. At a 1:8 dilution, CtPFA was prolonged in samples diluted with mannitol and HTS compared to saline, and CtPFA was prolonged more with mannitol than HTS. Ex-tem CT was increased at a 1:8 dilution with mannitol compared to HTS. Ex-tem CFT was prolonged at a 1:8 dilution with both agents compared to saline, and was prolonged more with mannitol than HTS. Ex-tem MCF was reduced at a 1:8 dilution with both agents compared to saline. Discussion and Conclusions Data in this study indicate that both mannitol and HTS affect canine platelet function and whole blood coagulation in vitro in a dose-dependent fashion. The most pronounced effects were observed after high dilutions with mannitol, which impaired platelet aggregation, clot formation time, clot strength, and fibrin formation significantly more than HTS. Further in vivo studies are necessary before recommendations can be made.
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Affiliation(s)
- Katja-Nicole Adamik
- Division of Emergency and Critical Care, Small Animal Clinic, Department of Clinical Veterinary Medicine, Vetsuisse Faculty, University of Bern, Laenggassstrasse 128, 3012, Bern, Switzerland.
| | - Emmanuelle Butty
- Division of Emergency and Critical Care, Small Animal Clinic, Department of Clinical Veterinary Medicine, Vetsuisse Faculty, University of Bern, Laenggassstrasse 128, 3012, Bern, Switzerland.
| | - Judith Howard
- Clinical Diagnostic Laboratory, Department of Clinical Veterinary Medicine, Vetsuisse Faculty, University of Bern, Laenggassstrasse 124, 3012, Bern, Switzerland.
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24
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Ho KK, Abrams-Ogg ACG, Wood RD, O'Sullivan ML, Kirby GM, Blois SL. Assessment of platelet function in healthy sedated cats using three whole blood platelet function tests. J Vet Diagn Invest 2015; 27:352-60. [PMID: 25943127 DOI: 10.1177/1040638715584994] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The objectives of this study were to establish feline references intervals for 3 commercial whole blood platelet function test analyzer systems: Multiplate analyzer (MP; Roche Diagnostics International Ltd., Rotkreuz, Switzerland), Platelet Function Analyzer-100 (PF: Siemens Canada, Mississauga, Ontario, Canada), and Plateletworks Combo-25 kit (PW; Helena Laboratories, Beaumont, TX). Venipuncture was performed on 55 healthy sedated cats, and platelet aggregation in response to adenosine diphosphate (ADP), collagen (COL), and arachidonic acid (AA; MP only) was assessed using citrated blood. For the MP analyzer, median (95% confidence intervals [CIs]) area under curve (Units) for ADP, COL, and AA agonists were 87 (11-176), 81 (32-129), and 91 (59-129), respectively. For the PF analyzer, median (95% CIs) closure time, using COL-ADP cartridges, was 69 (46-89) sec. For the PW assay, median (95% CIs) percent aggregations for ADP and COL agonists were 71 (18-92) and 49 (9-96), respectively, using impedance hematology analyzer platelet counts, and 94 (25-98) and 68 (14-119), respectively, using flow cytometry hematology analyzer platelet counts. There were low correlations between the PF analyzer (COL-ADP cartridge) and MP analyzer (COL agonist; ρ = 0.11), and between the PF analyzer (COL-ADP cartridge) and PW assay (COL agonist using impedance platelet counts; ρ = 0.14). The PW assay percent aggregations using impedance and flow cytometric platelet counts were correlated for both ADP (ρ = 0.64) and COL (ρ = 0.64) agonists. Platelet function testing using these tests are feasible in cats, but 95% CIs are wide, so single results may be difficult to interpret. Platelet counting by impedance or flow cytometry may be used for the PW assay but are not interchangeable.
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Affiliation(s)
- Kimberly K Ho
- Departments of Clinical Studies (Ho, Abrams-Ogg, O'Sullivan, Blois)Pathobiology (Wood), Ontario Veterinary College, University of Guelph, Guelph, Ontario, CanadaBiomedical Sciences (Kirby), Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada
| | - Anthony C G Abrams-Ogg
- Departments of Clinical Studies (Ho, Abrams-Ogg, O'Sullivan, Blois)Pathobiology (Wood), Ontario Veterinary College, University of Guelph, Guelph, Ontario, CanadaBiomedical Sciences (Kirby), Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada
| | - R Darren Wood
- Departments of Clinical Studies (Ho, Abrams-Ogg, O'Sullivan, Blois)Pathobiology (Wood), Ontario Veterinary College, University of Guelph, Guelph, Ontario, CanadaBiomedical Sciences (Kirby), Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada
| | - M Lynne O'Sullivan
- Departments of Clinical Studies (Ho, Abrams-Ogg, O'Sullivan, Blois)Pathobiology (Wood), Ontario Veterinary College, University of Guelph, Guelph, Ontario, CanadaBiomedical Sciences (Kirby), Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada
| | - Gordon M Kirby
- Departments of Clinical Studies (Ho, Abrams-Ogg, O'Sullivan, Blois)Pathobiology (Wood), Ontario Veterinary College, University of Guelph, Guelph, Ontario, CanadaBiomedical Sciences (Kirby), Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada
| | - Shauna L Blois
- Departments of Clinical Studies (Ho, Abrams-Ogg, O'Sullivan, Blois)Pathobiology (Wood), Ontario Veterinary College, University of Guelph, Guelph, Ontario, CanadaBiomedical Sciences (Kirby), Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada
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25
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Kong LR, Snead ECR, Burgess H, Dhumeaux MP. Recurrent episodes of severe bleeding caused by congenital factor XIII deficiency in a dog. J Am Vet Med Assoc 2014; 245:1147-52. [DOI: 10.2460/javma.245.10.1147] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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26
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Moreau M, Lussier B, Pelletier JP, Martel-Pelletier J, Bédard C, Gauvin D, Troncy E. A medicinal herb-based natural health product improves the condition of a canine natural osteoarthritis model: a randomized placebo-controlled trial. Res Vet Sci 2014; 97:574-81. [PMID: 25311158 DOI: 10.1016/j.rvsc.2014.09.011] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2014] [Revised: 09/12/2014] [Accepted: 09/15/2014] [Indexed: 11/28/2022]
Abstract
An oral herb-based natural health product (NHP) was evaluated in the canine natural osteoarthritis model. At baseline, the peak vertical force (PVF, primary endpoint) and case-specific outcome measure of disability (CSOM) were recorded in privately-owned dogs. Dogs (16/group) were randomized to receive NHP formulations or a negative control. The PVF was measured at week (W) 4 and W8. Daily locomotor activity was recorded using accelerometer. The CSOMs were assessed bi-weekly by the owner. The NHP-treated dogs (n = 13) had higher PVF at W4 (p = 0.020) and W8 (p <0.001) when compared to baseline. The changes at W8 were higher than control dogs (n = 14, p <0.027) and consistent with Cohen's d effect size of 0.7 (95% confidence interval: 0.0-1.5). The NHP-treated dogs had higher locomotor activity at W8 (p = 0.025) when compared to baseline. No significant change was observed for the CSOM. The NHP improved the clinical signs of osteoarthritis in this model.
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Affiliation(s)
- Maxim Moreau
- Research Group in Animal Pharmacology of Quebec (GREPAQ), Department of Veterinary Biomedical Sciences - Faculty of Veterinary Medicine, Université de Montréal, P.O. Box 5000, Saint-Hyacinthe, Quebec J2S 7C6, Canada; Osteoarthritis Research Unit, University of Montreal Hospital Research Centre (CRCHUM), Tour Viger, 900 St-Denis Street, Montreal, Quebec H2X 0A9, Canada
| | - Bertrand Lussier
- Research Group in Animal Pharmacology of Quebec (GREPAQ), Department of Veterinary Biomedical Sciences - Faculty of Veterinary Medicine, Université de Montréal, P.O. Box 5000, Saint-Hyacinthe, Quebec J2S 7C6, Canada; Osteoarthritis Research Unit, University of Montreal Hospital Research Centre (CRCHUM), Tour Viger, 900 St-Denis Street, Montreal, Quebec H2X 0A9, Canada
| | - Jean-Pierre Pelletier
- Osteoarthritis Research Unit, University of Montreal Hospital Research Centre (CRCHUM), Tour Viger, 900 St-Denis Street, Montreal, Quebec H2X 0A9, Canada
| | - Johanne Martel-Pelletier
- Osteoarthritis Research Unit, University of Montreal Hospital Research Centre (CRCHUM), Tour Viger, 900 St-Denis Street, Montreal, Quebec H2X 0A9, Canada
| | - Christian Bédard
- Department of Pathology and Microbiology - Faculty of Veterinary Medicine, Université de Montréal, P.O. Box 5000, Saint-Hyacinthe, Quebec J2S 7C6, Canada
| | - Dominique Gauvin
- Research Group in Animal Pharmacology of Quebec (GREPAQ), Department of Veterinary Biomedical Sciences - Faculty of Veterinary Medicine, Université de Montréal, P.O. Box 5000, Saint-Hyacinthe, Quebec J2S 7C6, Canada; Osteoarthritis Research Unit, University of Montreal Hospital Research Centre (CRCHUM), Tour Viger, 900 St-Denis Street, Montreal, Quebec H2X 0A9, Canada
| | - Eric Troncy
- Research Group in Animal Pharmacology of Quebec (GREPAQ), Department of Veterinary Biomedical Sciences - Faculty of Veterinary Medicine, Université de Montréal, P.O. Box 5000, Saint-Hyacinthe, Quebec J2S 7C6, Canada; Osteoarthritis Research Unit, University of Montreal Hospital Research Centre (CRCHUM), Tour Viger, 900 St-Denis Street, Montreal, Quebec H2X 0A9, Canada.
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Helmbold KA, Mellema MS, Hopper K, Epstein SE. The effect of hetastarch 670/0.75 administered in vivo as a constant rate infusion on platelet closure time in the dog. J Vet Emerg Crit Care (San Antonio) 2014; 24:381-7. [PMID: 25039869 DOI: 10.1111/vec.12209] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2013] [Accepted: 06/04/2014] [Indexed: 11/27/2022]
Abstract
OBJECTIVE To evaluate the effects of hetastarch 670/0.75 on canine platelet function and clinical bleeding following its administration as a constant rate infusion (CRI) at 1 mL/kg/h and 2 mL/kg/h for 24 hours. DESIGN In vivo, prospective, open-label, crossover study. SETTING Research laboratory at a university veterinary facility. ANIMALS Eight healthy, adult male research dogs. INTERVENTIONS Each dog received 1 mL/kg/h hetastarch for 24 hours then 2 mL/kg/h with a washout period of 10 weeks between each experiment. Platelet closure time (CT) was measured using a platelet function analyzer with collagen adenosine diphosphate (ADP) cartridges. CT measurements were performed at baseline and 6, 12, and 24 hours following initiation of hetastarch infusion. MEASUREMENTS AND MAIN RESULTS At 1 mL/kg/h, mean CT was significantly increased at the 12- and 24-hour time point relative to the baseline value, although mean CT never rose to a value above the reference interval during the 24-hour infusion. At 2 mL/kg/h, median CT was also significantly increased at the 12- and 24-hour time point relative to the baseline value. Administration of 2 mL/kg/h did progressively prolong the median CT value though only exceeded the reference interval at the 24-hour time point. Despite the prolongation of median CT, there was no clinical evidence of spontaneous bleeding in any dog during the 24-hour infusion at either CRI rate. CONCLUSIONS Hetastarch 670/0.75 when used as a 24-hour CRI at 1 and 2 mL/kg/h prolongs CT in healthy dogs at 6, 12, and 24 hours. Median CT only exceeded the reference interval at 24 hours at 2 mL/kg/h.
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Aumann M, Rossi V, Le Boedec K, Diquélou A. Comparison of the buccal mucosal bleeding time in dogs using 3 different-sized lancet devices. Vet Clin Pathol 2013; 42:451-7. [DOI: 10.1111/vcp.12087] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Marcel Aumann
- Internal Medicine; Department of Clinical Sciences; Université de Toulouse, INPT, ENVT; Toulouse France
| | - Valentina Rossi
- Internal Medicine; Department of Clinical Sciences; Université de Toulouse, INPT, ENVT; Toulouse France
| | - Kevin Le Boedec
- Internal Medicine; Department of Clinical Sciences; Université de Toulouse, INPT, ENVT; Toulouse France
| | - Armelle Diquélou
- Internal Medicine; Department of Clinical Sciences; Université de Toulouse, INPT, ENVT; Toulouse France
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Current diagnostic trends in coagulation disorders among dogs and cats. Vet Clin North Am Small Anim Pract 2013; 43:1349-72, vii. [PMID: 24144095 DOI: 10.1016/j.cvsm.2013.07.003] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The diagnostic workup to differentiate hemorrhage caused by vascular injury from a systemic hemostatic imbalance typically involves a combination of broad screening tests and specific assays. The characterization of 3 overlapping phases of primary hemostasis, secondary hemostasis, and fibrinolysis provides a simple diagnostic framework for evaluating patients with clinical signs of hemorrhage. New techniques such as flow cytometry, thrombin-generation assays, thrombelastography, and anticoagulant drug monitoring are under investigation for veterinary patients; however, their ability to improve diagnosis or treatment requires further study in clinical trials.
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McBride D, Hosgood GL, Mansfield CS, Smart L. Effect of hydroxyethyl starch 130/0.4 and 200/0.5 solutions on canine platelet function in vitro. Am J Vet Res 2013; 74:1133-7. [DOI: 10.2460/ajvr.74.8.1133] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Ferkau A, Gillmann HJ, Mischke R, Calmer S, Ecklebe S, Abid M, Minde JW, Echtermeyer F, Theilmeier G. Infection-associated platelet dysfunction of canine platelets detected in a flow chamber model. BMC Vet Res 2013; 9:112. [PMID: 23758817 PMCID: PMC3694517 DOI: 10.1186/1746-6148-9-112] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2012] [Accepted: 04/15/2013] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND In the present study, the influence of bacterial infection, lipopolysacharides (LPS) and hydroxyethyl starch (HES) on platelet function in a parallel plate flow chamber were measured. Experiments were performed with non-activated and protease-activating-receptor (PAR) 4 agonist activated platelets. Comparative measurements were in vivo capillary bleeding time, platelet function analyzer and impedance aggregometry. RESULTS PAR 4 agonist did not increase platelet adhesion of platelets from dogs with bacterial inflammation in the flow chamber in contrast to platelets of healthy dogs. Except from impedance aggregometry with lower sensitivity and specificity, PFA did not detect platelet dysfunctions in dogs with infection. In vitro addition of LPS or HES significantly reduced platelet covered area after PAR-activation. CONCLUSIONS The flow chamber detects platelet dysfunctions in dogs with inflammatory diseases. In vitro addition of LPS highlights the inhibiting effect of bacterial wall components on platelet function. Platelet dysfunction induced by infection could possibly also be diagnosed after treatment of sepsis with colloids has commenced. The flow chamber could be a useful tool to detect sepsis associated platelet dysfunction given that larger prospective trials confirm these findings from a proof of concept study.
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Affiliation(s)
- Annika Ferkau
- Department of Anesthesiology and Intensive Care Medicine, Hannover Medical School, Carl-Neuberg-Straße 1, Hannover D-30625, Germany
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Classen J, Adamik KN, Weber K, Rubenbauer S, Hartmann K. In vitro effect of hydroxyethyl starch 130/0.42 on canine platelet function. Am J Vet Res 2013; 73:1908-12. [PMID: 23176416 DOI: 10.2460/ajvr.73.12.1908] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To evaluate the effect of 6% hydroxyethyl starch (HES) solution, with a molecular weight of 130 kDa and a degree of substitution of 0.42, on canine platelet function in vitro. SAMPLES Blood samples from 31 healthy adult dogs. PROCEDURES Citrated blood was diluted with saline (0.9% NaCl) solution or HES 130/0.42 in ratios of 1:9 (ie, 1 part saline solution or HES 130/0.42 and 9 parts blood) and 1:3. Platelet plug formation time (closure time [Ct]) was measured with a platelet function analyzer and cartridges coated with collagen and ADP. RESULTS Median baseline Ct with citrated blood was 84.0 seconds (interquartile range, 74.5 to 99.5 seconds). Results obtained with 1:9 dilutions with saline solution and HES 130/0.42 were not significantly different from baseline results. The 1:3 dilutions with saline solution and HES 130/0.42 resulted in median Cts of 96.0 seconds (interquartile range, 85.5 to 110.8 seconds) and 112.0 seconds (92.0 to 126.0 seconds), respectively. Results obtained with both 1:3 dilutions were significantly different from baseline results. The Ct obtained with the HES dilution was also significantly different from that of the 1:3 dilution with saline solution. CONCLUSIONS AND CLINICAL RELEVANCE Saline solution and HES 130/0.42 in a 1:3 dilution affected canine platelet function by prolonging Cts. The HES 130/0.42 had a significantly greater effect on canine platelets than did saline solution.
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Affiliation(s)
- Janine Classen
- Clinic of Small Animal Medicine, Ludwig Maximilian University, Veterinaerstrasse 13, 80539 Munich, Germany
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Dudley A, Thomason J, Fritz S, Grady J, Stokes J, Wills R, Pinchuk L, Mackin A, Lunsford K. Cyclooxygenase expression and platelet function in healthy dogs receiving low-dose aspirin. J Vet Intern Med 2012; 27:141-9. [PMID: 23278865 DOI: 10.1111/jvim.12022] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2011] [Revised: 08/07/2012] [Accepted: 10/09/2012] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Low-dose aspirin is used to prevent thromboembolic complications in dogs, but some animals are nonresponsive to the antiplatelet effects of aspirin ("aspirin resistance"). HYPOTHESIS/OBJECTIVES That low-dose aspirin would inhibit platelet function, decrease thromboxane synthesis, and alter platelet cyclooxygenase (COX) expression. ANIMALS Twenty-four healthy dogs. METHODS A repeated measures study. Platelet function (PFA-100 closure time, collagen/epinephrine), platelet COX-1 and COX-2 expression, and urine 11-dehydro-thromboxane B(2) (11-dTXB(2)) were evaluated before and during aspirin administration (1 mg/kg Q24 hours PO, 10 days). Based on prolongation of closure times after aspirin administration, dogs were divided into categories according to aspirin responsiveness: responders, nonresponders, and inconsistent responders. RESULTS Low-dose aspirin increased closure times significantly (62% by Day 10, P < .001), with an equal distribution among aspirin responsiveness categories, 8 dogs per group. Platelet COX-1 mean fluorescent intensity (MFI) increased significantly during treatment, 13% on Day 3 (range, -29.7-136.1%) (P = .047) and 72% on Day 10 (range, -0.37-210%) (P < .001). Platelet COX-2 MFI increased significantly by 34% (range, -29.2-270%) on Day 3 (P = .003) and 74% (range, -19.7-226%) on Day 10 (P < .001). Urinary 11-dTXB(2) concentrations significantly (P = .005, P < .001) decreased at both time points. There was no difference between aspirin responsiveness and either platelet COX expression or thromboxane production. CONCLUSIONS AND CLINICAL IMPORTANCE Low-dose aspirin consistently inhibits platelet function in approximately one-third of healthy dogs, despite decreased thromboxane synthesis and increased platelet COX expression in most dogs. COX isoform expression before treatment did not predict aspirin resistance.
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Affiliation(s)
- A Dudley
- Department of Clinical Sciences, College of Veterinary Medicine, Mississippi State University, Mississippi State, MS 39762-6100, USA
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Thomason J, Lunsford K, Stokes J, Pinchuk L, Wills R, Langston C, Pruett S, Mackin A. The Effects of Cyclosporine on Platelet Function and Cyclooxygenase Expression in Normal Dogs. J Vet Intern Med 2012; 26:1389-401. [DOI: 10.1111/j.1939-1676.2012.01025.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2011] [Revised: 08/10/2012] [Accepted: 09/10/2012] [Indexed: 11/29/2022] Open
Affiliation(s)
- J. Thomason
- Department of Clinical Sciences, College of Veterinary Medicine; Mississippi State University; Mississippi State; MS
| | - K. Lunsford
- Department of Clinical Sciences, College of Veterinary Medicine; Mississippi State University; Mississippi State; MS
| | - J. Stokes
- Department of Basic Sciences, College of Veterinary Medicine; Mississippi State University; Mississippi State; MS
| | - L. Pinchuk
- Department of Basic Sciences, College of Veterinary Medicine; Mississippi State University; Mississippi State; MS
| | - R. Wills
- Department of Pathobiology and Population Medicine; College of Veterinary Medicine, Mississippi State University; Mississippi State; MS
| | - C. Langston
- Department of Clinical Sciences, College of Veterinary Medicine; Mississippi State University; Mississippi State; MS
| | - S. Pruett
- Department of Basic Sciences, College of Veterinary Medicine; Mississippi State University; Mississippi State; MS
| | - A. Mackin
- Department of Clinical Sciences, College of Veterinary Medicine; Mississippi State University; Mississippi State; MS
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36
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Herring J, McMichael M. Diagnostic Approach to Small Animal Bleeding Disorders. Top Companion Anim Med 2012; 27:73-80. [DOI: 10.1053/j.tcam.2012.07.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2012] [Accepted: 07/18/2012] [Indexed: 11/11/2022]
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37
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Mullins KB, Thomason JM, Lunsford KV, Pinchuk LM, Langston VC, Wills RW, McLaughlin RM, Mackin AJ. Effects of carprofen, meloxicam and deracoxib on platelet function in dogs. Vet Anaesth Analg 2012; 39:206-17. [DOI: 10.1111/j.1467-2995.2011.00684.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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Wiinberg B, Jessen LR, Tarnow I, Kristensen AT. Diagnosis and treatment of platelet hyperactivity in relation to thrombosis in dogs and cats. J Vet Emerg Crit Care (San Antonio) 2012; 22:42-58. [DOI: 10.1111/j.1476-4431.2011.00708.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Bo Wiinberg
- From the Department of Small Animal Clinical Sciences; Faculty of Life Sciences; University of Copenhagen; DK-1810 Frederiksberg; Denmark
| | - Lisbeth R. Jessen
- From the Department of Small Animal Clinical Sciences; Faculty of Life Sciences; University of Copenhagen; DK-1810 Frederiksberg; Denmark
| | - Inge Tarnow
- Health & Nutrition Division; Chr. Hansen A/S; DK-2970 Hørsholm; Denmark
| | - Annemarie T. Kristensen
- From the Department of Small Animal Clinical Sciences; Faculty of Life Sciences; University of Copenhagen; DK-1810 Frederiksberg; Denmark
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Defects in coagulation encountered in small animal critical care. Vet Clin North Am Small Anim Pract 2011; 41:783-803, vii. [PMID: 21757093 DOI: 10.1016/j.cvsm.2011.04.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Critically ill small animals are at risk for developing coagulation abnormalities. The processes of inflammation and coagulation are intertwined, and severe inflammation can lead to disturbances of coagulation. Severe coagulation dysfunction is associated with increased morbidity and mortality. Pathophysiology, diagnosis, and treatment of coagulation dysfunction are discussed. Defects in coagulation in small animal patients are complex and a consensus on diagnosis and treatment has yet to be reached.
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40
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Platelet function in dogs with congenital portosystemic shunt. Vet J 2011; 188:189-92. [DOI: 10.1016/j.tvjl.2010.04.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2009] [Revised: 04/07/2010] [Accepted: 04/08/2010] [Indexed: 11/22/2022]
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42
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Blois SL, Allen DG, Wood RD, Conlon PD. Effects of aspirin, carprofen, deracoxib, and meloxicam on platelet function and systemic prostaglandin concentrations in healthy dogs. Am J Vet Res 2010; 71:349-58. [DOI: 10.2460/ajvr.71.3.349] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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43
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Smart L, Jandrey KE, Kass PH, Wierenga JR, Tablin F. The effect of Hetastarch (670/0.75) in vivo on platelet closure time in the dog. J Vet Emerg Crit Care (San Antonio) 2009; 19:444-9. [PMID: 19821885 DOI: 10.1111/j.1476-4431.2009.00464.x] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVE To evaluate the effect of 6% hydroxyethyl starch (HES) solution in vivo, with an average molecular weight of 670 kDa and degree of substitution of 0.75, on canine platelet function. DESIGN Prospective, controlled-experimental study. SETTING University of California, Davis, Veterinary Medical Teaching Hospital. ANIMALS Seven healthy employee-owned dogs. INTERVENTIONS Seven dogs were included in the treatment group. Four of these dogs also served as the control group. Platelet closure time (CT) was measured using a platelet function analyzer and collagen/ADP cartridges. Dogs were given 20 mL/kg of either sodium chloride 0.9% (control group, n=4) or HES (treatment group, n=7) IV over 1 hour. CT was measured before the infusion, and at 1, 3, 5, and 24 hours after the start of the infusion. MEASUREMENTS AND MAIN RESULTS There was a significant change over time from 0 to 24 hours (P<0.001), a significant difference between groups across time (P<0.001), and a significant group-by-time interaction (P=0.007). At 3 hours, mean CT for the treatment group was 122.3+/-18.1 seconds, which was significantly different (P<0.001) from the control group (71.0+/-3.5 s). At 5 hours, mean CT for the treatment group was 142.7+/-33.9 seconds, which was significantly different (P=0.001) from the control group (75.0+/-8.6 s). Mean CT at 24 hours was within the reference interval for both the control and treatment group (66.0+/-2.9 and 81.8+/-11.9 s, respectively); however, CT in 3 individual dogs in the treatment group at this time point remained prolonged. CONCLUSIONS A clinically relevant dose of HES 670/0.75 prolongs CT in dogs for up to 24 hours. This may be due to platelet dysfunction in addition to the effects of hemodilution, and therefore, may increase the risk of bleeding.
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Affiliation(s)
- Lisa Smart
- William R Pritchard Veterinary Medical Teaching Hospital, University of California, Davis, CA, USA.
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44
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Clancey N, Burton S, Horney B, MacKenzie A, Nicastro A, Côté E. Effects of in vitro hemodilution of canine blood on platelet function analysis using the PFA-100. Vet Clin Pathol 2009; 38:467-70. [DOI: 10.1111/j.1939-165x.2009.00162.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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45
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Brooks MB, Randolph J, Warner K, Center S. Evaluation of platelet function screening tests to detect platelet procoagulant deficiency in dogs with Scott syndrome. Vet Clin Pathol 2009; 38:306-15. [DOI: 10.1111/j.1939-165x.2009.00141.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Clancey N, Burton S, Horney B, MacKenzie A, Nicastro A, Côté E. Evaluation of platelet function in dogs with cardiac disease using the PFA-100 platelet function analyzer. Vet Clin Pathol 2009; 38:299-305. [DOI: 10.1111/j.1939-165x.2009.00138.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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47
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Piccione G, Grasso F, Fazio F, Giudice E. The effect of physical exercise on the daily rhythm of platelet aggregation and body temperature in horses. Vet J 2008; 176:216-20. [PMID: 17408996 DOI: 10.1016/j.tvjl.2007.01.026] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2006] [Revised: 01/30/2007] [Accepted: 01/31/2007] [Indexed: 11/15/2022]
Abstract
The goal of this study was to investigate the influence of physical activity on the daily rhythm of platelet aggregation and body temperature in horses. Blood samples from 12 Thoroughbred horses, six sedentary animals and six athletes (studied both before and after a period of inactivity) were collected at 4h intervals for 48h via an intravenous cannula inserted into the jugular vein. Body temperature was recorded every 4h for 48h with a rectal probe. Platelet aggregation was measured with an aggregometer. Collagen was used to test the aggregation of the plasma samples. Statistical analysis of the data was performed by one-way repeated-measures analysis of variance (ANOVA) and by single cosinor method. Cosinor analysis identified the periodic parameters and their acrophases (expressed in hours) during the 2 days of monitoring. On each single day, there was a highly significant effect of time in all the horses, with P values <0.05. Temperature rhythms were unaffected by exercise. Platelet aggregation in exercising horses differed from the sedentary horses, and this difference disappeared after a 2-week period of rest. The results could be interpreted as indicating that physical exercise has an influence on the daily rhythm of platelet aggregation in horses.
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Affiliation(s)
- Giuseppe Piccione
- Department of Morphology, Biochemistry, Physiology and Animal Production, Laboratory of Veterinary Chronophysiology, Section of Veterinary Physiology, 98168 Messina, Italy.
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Influencing factors of ADP-induced, epinephrine-induced and ristomycin-induced platelet aggregation in dogs. Blood Coagul Fibrinolysis 2008; 19:14-22. [PMID: 18180610 DOI: 10.1097/mbc.0b013e3282e38e41] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Functional defects of platelets are often studied by in-vitro aggregation tests with chemical compounds such as ADP, epinephrine and ristomycin (ristocetin). The aim of the present work was to investigate the effect of some diseases and that of nonsteroidal anti-inflammatory drug treatment on platelet aggregation in dogs. The examination had been carried out on 115 dogs by a Carat TX4 optical aggregometer (Entec GmbH, Ilmenau, Germany) first used in veterinary practice. The dogs were divided in three groups: healthy (control) dogs (n = 43), diseased dogs with normal haemostasis profile (n = 44), and dogs suffering from arthropathies with normal haemostasis profile treated with the nonsteroidal anti-inflammatory drugs ketoprofen or carprofen (n = 21). Following establishment of normal platelet aggregation curves in healthy dogs we found that some diseases such as diabetes mellitus, Cushing's disease, mastocytoma and lymphoma increased or decreased the aggregation maximum of platelets or caused changes in the feature of the aggregation curve. Carprofen treatment had no effect on platelet aggregation while ketoprofen decreased the aggregation maximum. These results showed that Carat TX4 aggregometer proved a useful instrument in studying platelet aggregation in platelet-rich plasma of dogs. For clinical pathologists it is important to know that the effects of some diseases and nonsteroidal anti-inflammatory drug treatments have to be taken into account when in-vitro platelet aggregation is evaluated. Based on our results and on those of other studies, we think standardization in aggregation methodology is highly recommended in veterinary laboratories.
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Mineo HK, Garabed RB. Evaluation of a bench-top coagulation analyzer for measurement of prothrombin time, activated partial thromboplastin time, and fibrinogen concentrations in healthy dogs. Am J Vet Res 2008; 68:1342-7. [PMID: 18052739 DOI: 10.2460/ajvr.68.12.1342] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To evaluate a bench-top coagulation analyzer for determination of prothrombin time (PT), activated partial thromboplastin time (APTT), and fibrinogen concentration in healthy dogs. ANIMALS 55 healthy adult dogs. PROCEDURES PT, APTT, and fibrinogen concentration were determined by use of the coagulation analyzer. Values were compared with results obtained independently by a conventional laboratory. RESULTS Correlations (with 95% confidence intervals) between the coagulation analyzer and conventional laboratory values were 0.760 (0.610 to 0.857), 0.700 (0.448 to 0.721), and 0.896 (0.878 to 0.918) for PT, APTT, and fibrinogen concentration, respectively. Using linear regression, comparison of data from the coagulation analyzer and the conventional laboratory provided equations relating the coagulation analyzer values with values from the conventional laboratory and suggested that APTT and fibrinogen values from the coagulation analyzer and conventional laboratory were approximately the same within expected random variation. Prothrombin time values for the coagulation analyzer were significantly offset from the PT values for the conventional laboratory but still were correlated reasonably well with the conventional laboratory values. CONCLUSIONS AND CLINICAL RELEVANCE By use of the mechanical method of analysis, fibrinogen concentrations obtained with a bench-top coagulation analyzer correlated well with results for a conventional laboratory, indicating that the coagulation analyzer is a reliable instrument for determination of this coagulation variable. Coagulation analyzer results for PT and APTT correlated less strongly with those for the conventional laboratory, but they would still be considered clinically reliable.
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Affiliation(s)
- Heather K Mineo
- Advanced Critical Care and Internal Medicine, 3021 Edinger Avenue, Tustin, CA 92780, USA
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Nielsen LA, Zois NE, Pedersen HD, Olsen LH, Tarnow I. Platelet function in dogs: breed differences and effect of acetylsalicylic acid administration. Vet Clin Pathol 2007; 36:267-73. [PMID: 17806075 DOI: 10.1111/j.1939-165x.2007.tb00222.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Clinical studies investigating platelet function in dogs have had conflicting results that may be caused by normal physiologic variation in platelet response to agonists. OBJECTIVES The objective of this study was to investigate platelet function in clinically healthy dogs of 4 different breeds by whole-blood aggregometry and with a point-of-care platelet function analyzer (PFA-100), and to evaluate the effect of acetylsalicylic acid (ASA) administration on the results from both methods. METHODS Forty-five clinically healthy dogs (12 Cavalier King Charles Spaniels [CKCS], 12 Cairn Terriers, 10 Boxers, and 11 Labrador Retrievers) were included in the study. Platelet function was assessed by whole-blood aggregation with ADP (1, 5, 10, and 20 microM) as agonist and by PFA-100 using collagen and epinephrine (Col + Epi) and Col + ADP as agonists. Plasma thromboxane B(2) concentration was determined by an enzyme immunoassay. To investigate the effect of ASA, 10 dogs were dosed daily (75 or 250 mg ASA orally) for 4 consecutive days. RESULTS A higher platelet aggregation response was found in CKCS compared to the other breeds. Longer PFA-100 closure time (Col + Epi) was found in Cairn Terriers compared to Boxers. Plasma thromboxane B(2) concentration was not statistically different between groups. Administration of ASA prolonged the PFA-100 closure times, using Col + Epi (but not Col + ADP) as agonists. Furthermore, ASA resulted in a decrease in whole-blood platelet aggregation. CONCLUSIONS Platelet function is influenced by breed, depending upon the methodology applied. However, the importance of these breed differences remains to be investigated. The PFA-100 method with Col + Epi as agonists, and ADP-induced platelet aggregation appear to be sensitive to ASA in dogs.
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Affiliation(s)
- Line A Nielsen
- Department of Animal and Veterinary Basic Sciences, Faculty of Life Sciences, University of Copenhagen, Frederiksberg, Denmark.
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