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Fyneface-Ogan S, Fiebai PO, Orazulike NC. Effect of Carbetocin on Uterine Tone during Cesarean Section: A Comparison between Subarachnoid Block and General Anesthesia. Ann Afr Med 2023; 22:321-326. [PMID: 37417020 PMCID: PMC10445711 DOI: 10.4103/aam.aam_72_22] [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: 04/23/2022] [Accepted: 03/09/2023] [Indexed: 07/08/2023] Open
Abstract
Background Postpartum hemorrhage remains a challenge in obstetric practice in developing climes and contributes immensely to the horrendous figures of maternal mortality worldwide. Aim The aim was to compare the effect of intravenous (IV) carbetocin on uterine tone under different anesthetic techniques for elective cesarean section. Methods Four hundred and seventy-eight consecutive women scheduled for elective cesarean section were recruited into two groups by convenience. While 445 parturients received subarachnoid block (SAB), 33 had general anesthesia (GA). At delivery, IV carbetocin was administered. The uterine tone was assessed manually and blood loss from intraoperative period to the 24th h was determined. Other variables such as hemodynamic profiles and Apgar scores were determined and recorded. Results The bio-characteristics between the two groups were essentially the same in terms of age, weight, height, body mass index, preoperative hemoglobin, and gestational age. While the response to the administered carbetocin was slower in the GA group, there was no need for additional dose. The mean estimated intraoperative blood loss under SAB was 250.44 ± 50.59 ml and that under GA was 470.89 ± 35.70 ml, P = 0.000000. The ephedrine consumption was 6.25 ± 2.05 mg in the SAB group while it was 11.25 ± 2.49 mg, P = 0.000000. There was no further maternal blood loss observed after the intraoperative period until the end of 24-h period. The hemodynamic profiles were significantly different in terms of mean systolic blood pressure, mean diastolic blood pressure, and mean arterial blood pressure, P = 0.006, P = 0.002, and P = 0.003, respectively. However, the difference in the mean heart rate was not statistically significant, P = 0.304. While the Apgar scores between groups were not statistically significant, the mean umbilical pH was 7.34 ± 0.09 in the SAB group, it was 7.35 ± 0.02 in the GA group, P = 0.071. Conclusion Intraoperative maternal blood loss was more among the parturients who received GA than subarachnoid blood. This could probably be due to the effect of the halogenated vapor used for the GA on the uterine tone. There was no further blood loss after the intraoperative period. The hemodynamic profile was better under SAB as evidenced by the total ephedrine consumption.
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Affiliation(s)
- Sotonye Fyneface-Ogan
- Obstetric Anaesthesia Unit, University of Port Harcourt Teaching Hospital, Port Harcourt, Nigeria
| | - Preye O. Fiebai
- Department of Obstetrics and Gynaecology, University of Port Harcourt Teaching Hospital, Port Harcourt, Nigeria
| | - Ngozi Clare Orazulike
- Department of Obstetrics and Gynaecology, University of Port Harcourt Teaching Hospital, Port Harcourt, Nigeria
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Hassen AE, Agegnehu AF, Admass BA, Temesgen MM. Preoperative anemia and associated factors in women undergoing cesarean section at a comprehensive specialized referral hospital in Ethiopia. Front Med (Lausanne) 2023; 10:1056001. [PMID: 37081836 PMCID: PMC10110839 DOI: 10.3389/fmed.2023.1056001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Accepted: 03/21/2023] [Indexed: 04/07/2023] Open
Abstract
BackgroundAnemia is a common public health burden during pregnancy. Severe maternal and fetal complications have been associated with anemia. Despite many studies on anemia during pregnancy have been conducted in Ethiopia at any time of antenatal care visits, the prevalence of preoperative anemia among women awaiting cesarean delivery and its contributing factors have not been determined. The aim of this study was to determine the prevalence and associated factors of preoperative anemia in women awaiting cesarean section at a comprehensive specialized hospital in Ethiopia.MethodsAn institution-based cross-sectional study was done from April to June 2022 to determine preoperative anemia in women undergoing cesarean delivery. Data were obtained using a standardized questionnaire that included the women’s background characteristics. Bi-variable and multi-variable logistic regression analyses were performed to identify variables related to preoperative anemia. With a 95% confidence level, the estimated crude odds ratio and adjusted odds ratio were calculated. In a multivariate analysis, variables were considered statistically significant if their p-value was less than 0.05.ResultsA total of 424 pregnant women with a 100% response rate were included in this study. The prevalence of preoperative anemia among women awaiting cesarean delivery was 28.3% (95% CI: 23.8–32.5%). Previous history of abortion, lack of iron supplementation, human immunodeficiency virus infection, previous cesarean section, and American Society of Anesthesiology class III were significantly associated with preoperative anemia among women awaiting cesarean section.Conclusion and recommendationPreoperative anemia was diagnosed in a significant proportion of women awaiting cesarean-delivery. Anemia was linked to a lack of iron supplementation, American Society of Anesthesiology class III, previous history of abortion, human immunodeficiency virus infection, and previous cesarean section. Therefore, early detection of high-risk pregnancies, iron supplementation, prevention of HIV infection and due attention to people living with HIV/AIDs are paramount.
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Affiliation(s)
| | - Abatneh Feleke Agegnehu
- Department of Anesthesia, School of Medicine, College of Medicine and Health Sciences, University of Gondar, Gondar, Ethiopia
| | - Biruk Adie Admass
- Department of Anesthesia, School of Medicine, College of Medicine and Health Sciences, University of Gondar, Gondar, Ethiopia
- *Correspondence: Biruk Adie Admass,
| | - Mamaru Mollalign Temesgen
- Department of Anesthesia, School of Medicine, College of Medicine and Health Sciences, University of Gondar, Gondar, Ethiopia
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Rostovtsev AV, Aleksandrovich YS, Ryazanova OV, Akimenko TI, Pshenisnov KV. Pharmacological Management of Postpartum Haemorrhage. MESSENGER OF ANESTHESIOLOGY AND RESUSCITATION 2022. [DOI: 10.21292/2078-5658-2022-19-6-97-105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- A. V. Rostovtsev
- St. Petersburg State Pediatric Medical University; Maternity Hospital no. 13
| | | | - O. V. Ryazanova
- D. O. Ott Research Institute of Obstetrics, Gynecology and Reproductology
| | - T. I. Akimenko
- St. Petersburg State Pediatric Medical University; City Pokrov Hospital
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Taşgöz FN, Kılıçarslan N. Effect of anesthesia type on outcome measures in cesarean section in the presence of fetal macrosomia. Rev Assoc Med Bras (1992) 2022; 68:1410-1415. [PMID: 36417645 PMCID: PMC9683913 DOI: 10.1590/1806-9282.20220382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2022] [Accepted: 07/06/2022] [Indexed: 11/22/2022] Open
Abstract
OBJECTIVE: The aim of this study was to compare the effects of general and spinal anesthesia on maternal and neonatal outcomes during cesarean section in pregnancies with macrosomia. METHODS: This retrospective cohort study included 1043 patients who delivered by cesarean section between May 2018 and December 2021 and had a baby born with a birth weight of 4000 g or greater. Maternal and neonatal outcomes were compared according to the type of anesthesia performed in the spinal anesthesia group (n=903; 86.6%) and general anesthesia group (n=140; 13.4%). The Apgar score was categorized into <7 and ≥7. RESULTS: Neonates with an Apgar score of <7 at the first minute (11.4 vs. 0.4%; p<0.001) and the fifth minute (2.9 vs. 0.3%; p=0.004) were significantly higher in the general anesthesia group. The preoperative and postoperative hematocrit difference was significantly lower in patients who received spinal anesthesia than those who received general anesthesia [2 (1.1–3.1) vs. 4.05 (2.8–5.35); p<0.001]. The number of patients transfused was higher in the general anesthesia group (9.3 vs. 2.7%; p<0.001). In the regression model, general anesthesia, birth weight, and emergency conditions were significant independent factors related to the preoperative and postoperative hematocrit decrease (p<0.001, p=0.005, and p=0.034, respectively). CONCLUSIONS: Apgar scores of <7 at the first and fifth minutes are higher in macrosomic neonates who received general anesthesia than in neonates who received spinal anesthesia. Performing cesarean section under general anesthesia in mothers of macrosomic neonates results in a greater decrease in hematocrit value and a greater need for blood transfusion than under spinal anesthesia.
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Gultekin A, Sahin A, Akgul M, Yildirim I, Altinoz K, Baran O, Arar C. The effect of epidural analgesia added to general anesthesia on systemic immune-inflammation index in radical prostatectomy surgery: A retrospective study. Niger J Clin Pract 2022; 25:855-860. [DOI: 10.4103/njcp.njcp_1858_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Ring L, Landau R, Delgado C. The Current Role of General Anesthesia for Cesarean Delivery. CURRENT ANESTHESIOLOGY REPORTS 2021; 11:18-27. [PMID: 33642943 PMCID: PMC7902754 DOI: 10.1007/s40140-021-00437-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/02/2021] [Indexed: 12/20/2022]
Abstract
Purpose of the Review The use of general anesthesia for cesarean delivery has declined in the last decades due to the widespread utilization of neuraxial techniques and the understanding that neuraxial anesthesia can be provided even in urgent circumstances. In fact, the role of general anesthesia for cesarean delivery has been revisited, because despite recent devices facilitating endotracheal intubation and clinical algorithms, guiding anesthesiologists facing challenging scenarios, risks, and complications of general anesthesia at the time of delivery for both mother and neonate(s) remain significant. In this review, we will discuss clinical scenarios and risk factors associated with general anesthesia for cesarean delivery and address reasons why anesthesiologists should apply strategies to minimize its use. Recent Findings Unnecessary general anesthesia for cesarean delivery is associated with maternal complications, including serious anesthesia-related complications, surgical site infection, and venous thromboembolic events. Racial and socioeconomic disparities and low-resource settings are major contributing factors in the use of general anesthesia for cesarean delivery, with both maternal and perinatal mortality increasing when general anesthesia is provided. In addition, more significant maternal pain and higher rates of postpartum depression requiring hospitalization are associated with general anesthesia for cesarean delivery. Summary Rates of general anesthesia for cesarean delivery have overall decreased, and while general anesthesia no longer is a contributing factor to anesthesia-related maternal deaths, further opportunities to reduce its use should be emphasized. Raising awareness in identifying situations and patients at risk to help avoid unnecessary general anesthesia remains crucial.
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Affiliation(s)
- Laurence Ring
- Department of Anesthesiology, Columbia University Irving Medical Center, New York, NY USA
| | - Ruth Landau
- Department of Anesthesiology, Columbia University Irving Medical Center, New York, NY USA
| | - Carlos Delgado
- Department of Anesthesiology and Pain Medicine, University of Washington, Seattle, WA USA
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Al-Husban N, Elmuhtaseb MS, Al-Husban H, Nabhan M, Abuhalaweh H, Alkhatib YM, Yousef M, Aloran B, Elyyan Y, Alghazo A. Anesthesia for Cesarean Section: Retrospective Comparative Study. Int J Womens Health 2021; 13:141-152. [PMID: 33564269 PMCID: PMC7866905 DOI: 10.2147/ijwh.s292434] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Accepted: 12/29/2020] [Indexed: 01/01/2023] Open
Abstract
Background Cesarean section is a widely performed surgery. Objective To compare anesthetic types regarding feto-maternal outcomes. Materials and Methods Retrospective comparative study of 3599 cesarean sections (emergency and elective categories). Results Mean APGAR score was statistically higher in the spinal than general anesthesia among the emergency category, P = 0.000 and 0.026, respectively, with no significant difference in the elective category. Estimated blood loss among the elective category was statistically significantly higher in the spinal than general anesthesia, P = 0.001. However, among the emergency category, it was significantly higher in the general than in spinal or epidural anesthesia, P = 0.000. Diclofenac sodium was used more after spinal than general anesthesia (P = 0.000), with no significant difference between epidural and general or between epidural and spinal anesthesia. Pethidine hydrochloride (HCL) was used more after general than after spinal anesthesia (P = 0.000). However, pethidine HCL use was not statistically significantly different between spinal and epidural anesthesia. In the elective category, paracetamol was requested more after spinal than epidural or general anesthesia, P = 0.000. No significant difference was seen between epidural and general anesthesia, P = 1.000. No statistically significant difference was found among the anesthetic types in both categories regarding tramadol HCL. Length of hospital stay, operative time and neonatal intensive care unit admission were not statistically different between anesthetic modes. In the emergency category, significantly higher percentage of patients were satisfied with and would recommend epidural anesthesia. Conclusion There was no statistically significant difference among the three types of anesthesia regarding neonatal intensive care admission and length of hospital stay for emergency and elective categories. APGAR score was higher with spinal than with general anesthesia in the emergency category with no significant difference in the elective category. More diclofenac sodium and paracetamol and less opioids were used after regional than after general anesthesia. Satisfaction was higher with epidural anesthesia. Limitations Retrospective and single centered.
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Affiliation(s)
- Naser Al-Husban
- Faculty of Medicine, The University of Jordan, Amman, Jordan
| | | | | | - Mohammed Nabhan
- Obstetrics and Gynecology Department, Jordan University Hospital, Amman, Jordan
| | - Hamza Abuhalaweh
- Obstetrics and Gynecology Department, Jordan University Hospital, Amman, Jordan
| | | | - Maysa Yousef
- Obstetrics and Gynecology Department, Jordan University Hospital, Amman, Jordan
| | - Bayan Aloran
- Obstetrics and Gynecology Department, Jordan University Hospital, Amman, Jordan
| | - Yousef Elyyan
- Obstetrics and Gynecology Department, Jordan University Hospital, Amman, Jordan
| | - Asma Alghazo
- Obstetrics and Gynecology Department, Jordan University Hospital, Amman, Jordan
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General Versus Regional Anesthesia for Emergency Cesarean Delivery in a High-volume High-resource Referral Center: A Retrospective Cohort Study. Rom J Anaesth Intensive Care 2020; 27:6-10. [PMID: 34056127 PMCID: PMC8158321 DOI: 10.2478/rjaic-2020-0012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Objective The choice of anesthesia for emergency cesarean delivery (CD) is one of the most important choices to make in obstetric anesthesia. In this study, we examine which type of anesthesia was used for emergency CD in our hospital, and how the choice affected the time from entry to the operation room until incision (TTI), time until delivery (TTD), and maternal/neonatal outcomes. Methods Retrospectively, we examined all emergency CD's performed in Shaare Zedek Medical Center between January-December 2018. Results: 1059 patients met the inclusion criteria, of which 7.7% underwent general anesthesia (GA), 36.2% - conversion from labor epidural analgesia to surgical anesthesia, 52% - spinal anesthesia and 4.1% - combined spinal epidural. We did not find a significant difference between the GA and conversion epidural groups in terms of TTI or TTD. Nevertheless, GA was found to be correlated to a high rate of blood-products requirement and ICU admission. The rate of newborns with an APGAR score of less than 7, in both first and fifth second after birth, was significantly higher in the GA group, as well as the need for NICU admission. Conclusion This study clearly emphasizes that the TTI are shortest when using GA or conversion of labor epidural analgesia to surgical anesthesia. Meanwhile, GA is also linked to higher rates of admissions to ICU as well as poorer neonatal outcomes compared to the other groups. Additionally, our study uncovered a low rate of GA, and relatively low rate of regional anesthesia failure, which meets the accepted standards.
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Alimian M, Mohseni M, Faiz SHR, Rajabi A. The Effect of Different Doses of Intrathecal Hyperbaric Bupivacaine Plus Sufentanil in Spinal Anesthesia for Cesarean Sections. Anesth Pain Med 2018; 7:e14426. [PMID: 29696121 PMCID: PMC5903377 DOI: 10.5812/aapm.14426] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2017] [Revised: 10/09/2017] [Accepted: 10/20/2017] [Indexed: 11/16/2022] Open
Abstract
Background Decreasing side effects and improving the quality of block in caesarean sections by appropriate dosage of local anesthetics and adjuvants could play an important role in the safe management of cesarean section. The present study aimed at comparing the effects of 3 different doses of intrathecal hyperbaric bupivacaine injected with a fixed dose of sufentanil in cesarean sections. Methods In a double- blind randomized clinical trial, 105 candidates of elective cesarean section were randomly assigned into 3 groups of 8, 9, and 10 mg of intrathecal bupivacaine plus sufentanil 2.5 µg. The maximum level of sensory block, the intensity of motor block, and vital signs were measured at regular intervals. The incidence of hypotension and bradycardia were also recorded. Results No significant difference was found between the maximum level of sensory block and the intensity of motor block in 3 groups. The incidences of hypotension and bradycardia as well as administration of atropine and ephedrine were comparable among the 3 groups (P > 0.05). Conclusions According to similar effects of different doses of bupivacaine, administration of lower doses of bupivacaine (8mg) is more reasonable for spinal anesthesia for cesarean section.
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Affiliation(s)
- Mahzad Alimian
- Associate Professor, Department of Anesthesiology, Iran University of Medical Sciences, Tehran, Iran
| | - Masood Mohseni
- Associate Professor, Department of Anesthesiology, Iran University of Medical Sciences, Tehran, Iran
- Corresponding author: Masood Mohseni, MD, Associate Professor, Department of Anesthesiology, Iran University of Medical Sciences, Tehran, Iran. Tel: +98-2164352326, E-mail:
| | - Seyed Hamid Reza Faiz
- Associate Professor, Department of Anesthesiology, Iran University of Medical Sciences, Tehran, Iran
| | - Alireza Rajabi
- Resident, Department of Anesthesiology, Iran University of Medical Sciences, Tehran, Iran
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Major underestimation and overestimation of visual blood loss during cesarean deliveries: can they be predicted? Arch Gynecol Obstet 2017; 296:907-913. [DOI: 10.1007/s00404-017-4506-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Accepted: 08/23/2017] [Indexed: 10/18/2022]
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Multimodal Approaches to Analgesia in Enhanced Recovery After Surgery Pathways. Int Anesthesiol Clin 2017; 55:51-69. [DOI: 10.1097/aia.0000000000000165] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Dallaku K, Shakur H, Edwards P, Beaumont D, Roberts I, Huque S, Delius M, Mansmann U. Statistical analysis plan for the WOMAN-ETAPlaT study: Effect of tranexamic acid on platelet function and thrombin generation. Wellcome Open Res 2016. [DOI: 10.12688/wellcomeopenres.10105.1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Background. Postpartum haemorrhage (PPH) is a potentially life-threatening complication for women, and the leading cause of maternal mortality. Tranexamic acid (TXA) is an antifibrinolytic used worldwide to treat uterine haemorrhage and to reduce blood loss in general surgery. TXA may have effects on thrombin generation, platelet function and coagulation factors as a result of its inhibition on the plasmin. Methods. WOMAN ETAPlaT is a sub-study of the World Maternal Antifibrinolitic trial (WOMAN trial). All adult women clinically diagnosed with PPH after a vaginal delivery or caesarean section, are eligible for inclusion in the study. Blood samples will be collected at the baseline and 30 minutes after the first dose of study treatment is given. Platelet function will be evaluated in whole blood immediately after sampling with Multiplate® tests (ADPtest and TRAPtest). Thrombin generation, fibrinogen, D-dimer, and coagulation factors vW, V and VIII will be analysed using platelet poor plasma. Results. Recruitment to WOMAN ETAPlaT started on 04 November 2013 and closed on 13 January 2015, during this time 188 patients were recruited. The final participant follow-up was completed on 04 March 2015. This article introduces the statistical analysis plan for the study, without reference to unblinded data. Conclusion. The data from this study will provide evidence for the effect of TXA on thrombin generation, platelet function and coagulation factors in women with PPH. Trial registration: ClinicalTrials.gov Identifier: NCT00872469; ISRCTN76912190
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Dallaku K, Shakur H, Edwards P, Beaumont D, Roberts I, Huque S, Delius M, Mansmann U. Statistical analysis plan for the WOMAN-ETAPlaT study: Effect of tranexamic acid on platelet function and thrombin generation. Wellcome Open Res 2016; 1:30. [PMID: 28413832 PMCID: PMC5390850 DOI: 10.12688/wellcomeopenres.10105.2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Background. Postpartum haemorrhage (PPH) is a potentially life-threatening complication for women, and the leading cause of maternal mortality. Tranexamic acid (TXA) is an antifibrinolytic used worldwide to treat uterine haemorrhage and to reduce blood loss in general surgery. TXA may have effects on thrombin generation, platelet function and coagulation factors as a result of its inhibition on the plasmin. Methods. WOMAN ETAPlaT is a sub-study of the World Maternal Antifibrinolitic trial (WOMAN trial). All adult women clinically diagnosed with PPH after a vaginal delivery or caesarean section, are eligible for inclusion in the study. Blood samples will be collected at the baseline and 30 minutes after the first dose of study treatment is given. Platelet function will be evaluated in whole blood immediately after sampling with Multiplate® tests (ADPtest and TRAPtest). Thrombin generation, fibrinogen, D-dimer, and coagulation factors vW, V and VIII will be analysed using platelet poor plasma. Results. Recruitment to WOMAN ETAPlaT started on 04 November 2013 and closed on 13 January 2015, during this time 188 patients were recruited. The final participant follow-up was completed on 04 March 2015. This article introduces the statistical analysis plan for the study, without reference to unblinded data. Conclusion. The data from this study will provide evidence for the effect of TXA on thrombin generation, platelet function and coagulation factors in women with PPH. Trial registration: ClinicalTrials.gov Identifier: NCT00872469; ISRCTN76912190
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Affiliation(s)
- Kastriot Dallaku
- Institute for Medical Information Sciences, Biometry and Epidemiology, Klinikum Großhadern, Ludwig-Maximilian University, Munich, Germany.,University Hospital of Obstetrics Gynaecology "Koco Gliozheni, Tirana, Albania
| | - Haleema Shakur
- Clinical Trials Unit, London School of Hygiene & Tropical Medicine, London, UK
| | - Phil Edwards
- Clinical Trials Unit, London School of Hygiene & Tropical Medicine, London, UK
| | - Danielle Beaumont
- Clinical Trials Unit, London School of Hygiene & Tropical Medicine, London, UK
| | - Ian Roberts
- Clinical Trials Unit, London School of Hygiene & Tropical Medicine, London, UK
| | - Sumaya Huque
- Clinical Trials Unit, London School of Hygiene & Tropical Medicine, London, UK
| | - Maria Delius
- Department of Obstetrics and Gynaecology, Ludwig Maximilian University of Munich, Munich, Germany
| | - Ulrich Mansmann
- Institute for Medical Information Sciences, Biometry and Epidemiology, Klinikum Großhadern, Ludwig-Maximilian University, Munich, Germany
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