Aggregometry in Elderlies With Hip Fracture and Receiving Clopidogrel
NCT ID: NCT04642209
Last Updated: 2020-11-24
Study Results
The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.
Basic Information
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UNKNOWN
9 participants
OBSERVATIONAL
2020-12-01
2020-12-30
Brief Summary
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After hospital admission for femur fracture, eligible patients would be evaluated by the anesthesiologist and the orthopedic physicians for anesthesia and surgery. Immediately a sample of blood should be collected for TEG with ADP Platelet Mapping test. If both MA-ADP and platelets aggregation (%) will be within normal values, the patient could be considered as candidate for immediate surgery (within 48 hours) with neuraxial anesthesia and ultrasound-guided antalgic femoral nerve block. If MA-ADP and/or platelets aggregation (%) are lower, risk for mortality should be assessed. If the patient would be considered at high risk for mortality, he/she would undergo to general anesthesia and peripheral antalgic block to not postpone surgery. Otherwise, surgery would be postponed until the normalization of both MA-ADP and platelet aggregation.
Detailed Description
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Neuraxial anesthesia and/or peripheral nerve block are generally preferred in elderlies. However, cardiovascular and/or cerebral comorbidities require antiplatelets therapies at home. This treatment precludes the possibility of an optimal anesthesiologic strategy (i.e., loco-regional anesthesia) within the recommended surgical timing. Therefore, an individual approach is required to balance the risk of drugs continuation/cessation on major cardiovascular events and on peri-operative bleeding.
Clopidogrel is a second-generation thienopyridine antiplatelet drug, that exerts its effect by the inhibition of the platelet's purinergic receptor P2Y12, preventing adenosine diphosphate (ADP) from stimulating it. In patients needing surgery, guidelines recommend withholding clopidogrel 5 days before. However, around 30% of patients are resistant to clopidogrel for several reasons. Patients resistant to clopidogrel may be identify through the thromboelastography (TEG). TEG is a resonance-frequency viscoelastic point-of-care diagnostic system that assesses hemostasis and response to antiplatelet therapy, in combination with the ADP Platelet Mapping assay kit.
It has been hypothesized that the assessment of platelet aggregation with TEG and ADP Platelet Mapping may identify patients resistant to clopidogrel, not requiring to wait for 5 days for hip replacement surgery. We have therefore designed this protocol to guide anesthesiologists in the management of elderlies receiving clopidogrel and requiring surgery for hip fracture. The aim of this pilot study is to evaluate if in a small population of patients, our protocol based on platelet function monitoring would anticipate surgery within 48 hours at least in 70% of elderly patients receiving clopidogrel.
Conditions
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Study Design
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CASE_ONLY
PROSPECTIVE
Study Groups
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Aggregometry
surgical timing will be guided by the results obtained by aggregometry
Aggregometry
After evaluation at the Emergency Department the anesthesiologist immediately collects a sample of blood for TEG with ADP Platelet Mapping test.
If both MA-ADP and platelets aggregation (%) are within normal values (i.e. ≥45 mm and ≥83%, respectively), the patient could be considered as candidate for immediate surgery (within 48 hours) with neuraxial anesthesia.
If MA-ADP and/or platelets aggregation (%) are lower than normal values, the Nottingham Hip Fracture Score (NHFS) is computed, to predict the 30-day mortality after hip fracture surgery. If NHFS is ≥4 (high risk), the patient will undergo to general anesthesia and peripheral antalgic block, to perform surgery within 48 hours. In case of low risk for mortality (i.e. a NHFS \<4), surgery will be postponed until the normalization of both MA-ADP and platelet aggregation.
Interventions
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Aggregometry
After evaluation at the Emergency Department the anesthesiologist immediately collects a sample of blood for TEG with ADP Platelet Mapping test.
If both MA-ADP and platelets aggregation (%) are within normal values (i.e. ≥45 mm and ≥83%, respectively), the patient could be considered as candidate for immediate surgery (within 48 hours) with neuraxial anesthesia.
If MA-ADP and/or platelets aggregation (%) are lower than normal values, the Nottingham Hip Fracture Score (NHFS) is computed, to predict the 30-day mortality after hip fracture surgery. If NHFS is ≥4 (high risk), the patient will undergo to general anesthesia and peripheral antalgic block, to perform surgery within 48 hours. In case of low risk for mortality (i.e. a NHFS \<4), surgery will be postponed until the normalization of both MA-ADP and platelet aggregation.
Eligibility Criteria
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Inclusion Criteria
* admission to the hospital for suspected traumatic femur fracture
* home therapy with clopidogrel 75 mg/die at home
Exclusion Criteria
* assumption of any anticoagulant oral therapy
* platelet count \<100.000 mcL
* pre-existing liver disease
* known autoimmune diseases
* presence of hematological malignancies
65 Years
ALL
No
Sponsors
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University Magna Graecia
OTHER
Responsible Party
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Federico Longhini
Director
Principal Investigators
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Federico Longhini, MD
Role: STUDY_CHAIR
Magna Graecia University, Anesthesia and Intensive Care Unit
Locations
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Federico Longhini
Catanzaro, , Italy
Countries
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Central Contacts
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Facility Contacts
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Federico Longhini, MD
Role: primary
References
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Bottle A, Aylin P. Mortality associated with delay in operation after hip fracture: observational study. BMJ. 2006 Apr 22;332(7547):947-51. doi: 10.1136/bmj.38790.468519.55. Epub 2006 Mar 22.
Kristensen SD, Knuuti J, Saraste A, Anker S, Botker HE, De Hert S, Ford I, Gonzalez Juanatey JR, Gorenek B, Heyndrickx GR, Hoeft A, Huber K, Iung B, Kjeldsen KP, Longrois D, Luescher TF, Pierard L, Pocock S, Price S, Roffi M, Sirnes PA, Uva MS, Voudris V, Funck-Brentano C; Authors/Task Force Members. 2014 ESC/ESA Guidelines on non-cardiac surgery: cardiovascular assessment and management: The Joint Task Force on non-cardiac surgery: cardiovascular assessment and management of the European Society of Cardiology (ESC) and the European Society of Anaesthesiology (ESA). Eur J Anaesthesiol. 2014 Oct;31(10):517-73. doi: 10.1097/EJA.0000000000000150. No abstract available.
Warlo EMK, Arnesen H, Seljeflot I. A brief review on resistance to P2Y12 receptor antagonism in coronary artery disease. Thromb J. 2019 May 20;17:11. doi: 10.1186/s12959-019-0197-5. eCollection 2019.
Tarrant SM, Kim RG, McGregor KL, Palazzi K, Attia J, Balogh ZJ. Dual Antiplatelet Therapy and Surgical Timing in Geriatric Hip Fracture. J Orthop Trauma. 2020 Oct;34(10):559-565. doi: 10.1097/BOT.0000000000001779.
Yang Z, Ni J, Long Z, Kuang L, Gao Y, Tao S. Is hip fracture surgery safe for patients on antiplatelet drugs and is it necessary to delay surgery? A systematic review and meta-analysis. J Orthop Surg Res. 2020 Mar 12;15(1):105. doi: 10.1186/s13018-020-01624-7.
Price MJ, Walder JS, Baker BA, Heiselman DE, Jakubowski JA, Logan DK, Winters KJ, Li W, Angiolillo DJ. Recovery of platelet function after discontinuation of prasugrel or clopidogrel maintenance dosing in aspirin-treated patients with stable coronary disease: the recovery trial. J Am Coll Cardiol. 2012 Jun 19;59(25):2338-43. doi: 10.1016/j.jacc.2012.02.042.
Tescione M, Vadala E, Marano G, Battaglia E, Bruni A, Garofalo E, Longhini F, Rovida S, Polimeni N, Squillaci R, Lascala S, Franco G, Labate D, Caracciolo M, Macheda S. Platelet aggregometry for hip fracture surgery in patients treated with clopidogrel: a pilot study. J Clin Monit Comput. 2022 Jun;36(3):823-828. doi: 10.1007/s10877-021-00714-z. Epub 2021 May 6.
Other Identifiers
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Teg-Femur
Identifier Type: -
Identifier Source: org_study_id