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Buechel J, Monod C, Alba Alejandre I, Ninke T, Hoesli I, Starrach T, Delius M, Mahner S, Kaltofen T. Amniotic Fluid Embolism: a comparison of two classification systems in a retrospective 8-year analysis from two tertiary hospitals. J Gynecol Obstet Hum Reprod 2023; 52:102597. [PMID: 37087046 DOI: 10.1016/j.jogoh.2023.102597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2023] [Revised: 04/15/2023] [Accepted: 04/19/2023] [Indexed: 04/24/2023]
Abstract
OBJECTIVE Amniotic fluid embolism (AFE) is a rare life-threatening complication in obstetrics, but the diagnosis lacks a consensual definition. The objective of this study was to compare two different AFE classification systems by analysing the AFE cases from two university hospitals. MATERIAL AND METHODS In this retrospective study, all patients with a strong suspicion of AFE between 2014 and 2021 at two university hospitals, LMU Women's University Hospital Munich, and Women's University Hospital Basel, were included. Patient records were checked for the ICD-10 code O88.1 (AFE). Diagnoses were confirmed through clinical findings and/or autopsy. The presence of the diagnostic criteria of the Society of Maternal Fetal Medicine (SMFM) and the AFE Foundation (AFEF) and of a new framework by Ponzio-Klijanienko et al. from Paris, France, were checked and compared using Chi-square-test. RESULTS Within our study period, 38,934 women delivered in the two hospitals. Six patients had a strong suspicion of AFE (0.015%). Only three of six patients (50%) presented with all the four diagnostic criteria of the SMFM/AFEF framework. All six patients met the criteria of the modified "Paris AFE framework". CONCLUSION Using the "Paris AFE framework" based exclusively on clinical criteria can help clinicians to diagnose AFE, anticipate the life-threatening condition of the patient and prepare immediately for best clinical care.
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Affiliation(s)
- J Buechel
- Department of Obstetrics and Gynecology, University Hospital, LMU Munich, Marchioninistrasse 15, 81377, Munich, Germany.
| | - C Monod
- Department of Obstetrics and Antenatal Care, University Hospital Basel, Spitalstrasse 21, 4031, Basel, Switzerland; Medical Faculty, University Basel, Basel, Klingelbergstrasse 61, 4056, Basel, Switzerland
| | - I Alba Alejandre
- Department of Obstetrics and Gynecology, University Hospital, LMU Munich, Marchioninistrasse 15, 81377, Munich, Germany
| | - T Ninke
- Department of Anesthesiology, University Hospital, LMU Munich, Marchioninistrasse 15, 81377, Munich, Germany
| | - I Hoesli
- Department of Obstetrics and Antenatal Care, University Hospital Basel, Spitalstrasse 21, 4031, Basel, Switzerland; Medical Faculty, University Basel, Basel, Klingelbergstrasse 61, 4056, Basel, Switzerland
| | - T Starrach
- Department of Obstetrics and Gynecology, University Hospital, LMU Munich, Marchioninistrasse 15, 81377, Munich, Germany
| | - M Delius
- Department of Obstetrics and Gynecology, University Hospital, LMU Munich, Marchioninistrasse 15, 81377, Munich, Germany
| | - S Mahner
- Department of Obstetrics and Gynecology, University Hospital, LMU Munich, Marchioninistrasse 15, 81377, Munich, Germany
| | - T Kaltofen
- Department of Obstetrics and Gynecology, University Hospital, LMU Munich, Marchioninistrasse 15, 81377, Munich, Germany; Department for Surgery, University Hospital Regensburg, Franz-Josef-Strauß-Allee 11, 93053, Regensburg, Germany
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Knapp C, Bhatia K. Maternal collapse in pregnancy. Br J Hosp Med (Lond) 2022; 83:1-12. [PMID: 36594762 DOI: 10.12968/hmed.2022.0259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Maternal collapse is a rare life-threatening event that can occur at any stage of pregnancy or up to 6 weeks postpartum. Prompt identification and timely intervention by a multidisciplinary team that includes an obstetrician, midwifery staff and an obstetric anaesthetist are essential to improve maternal and fetal outcomes. Standard adult resuscitation guidelines need to be followed with some modifications, taking into account the maternal-fetal physiology, which clinicians should be familiar with. During cardiac arrest, the emphasis is on advanced airway management, manual uterine displacement to relieve aortocaval compression and performing a resuscitative hysterotomy (peri-mortem caesarean delivery) swiftly in patients who are more than 20 weeks gestation to improve maternal survival. Annual multidisciplinary simulation training is recommended for all professionals involved in maternity care; this can improve teamwork, communication and emergency preparedness during maternal collapse.
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Affiliation(s)
- C Knapp
- North West School of Anaesthesia, Health Education England North West, Manchester, UK
| | - K Bhatia
- Department of Anaesthesia, St Mary's Hospital, Manchester University NHS Foundation Trust, University of Manchester, Manchester, UK
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Fibrinogen may aid in the early differentiation between amniotic fluid embolism and postpartum haemorrhage: a retrospective chart review. Sci Rep 2021; 11:8379. [PMID: 33863968 PMCID: PMC8052446 DOI: 10.1038/s41598-021-87685-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Accepted: 03/31/2021] [Indexed: 12/13/2022] Open
Abstract
This study aimed to determine whether blood loss and fibrinogen can differentiate amniotic fluid embolism (AFE) from postpartum haemorrhage (PPH). This retrospective case–control study included nine patients with clinical AFE (“AFE group”) and 78 patients with PPH managed at our tertiary care perinatal centre between January 2014 and March 2016. Patients meeting the Japanese diagnostic criteria for AFE were stratified into cardiopulmonary collapse-type AFE and disseminated intravascular coagulation (DIC)-type AFE groups. The relationship between blood loss and fibrinogen at onset was examined to compare DIC severity. Vital signs at onset were not significantly different. The AFE group had significantly less blood loss at onset (1506 mL vs 1843 mL, P = 0.0163), significantly more blood loss 2 h post-onset (3304 mL vs 1996 mL, P < 0.0001) and more severe coagulopathy and fibrinolysis. The blood loss/fibrinogen (B/F) ratio at onset was significantly higher in the DIC-type AFE group (23.15 ± 8.07 vs 6.28 ± 3.35 mL dL/mg, P < 0.0001). AFE was complicated by catastrophic DIC irrespective of blood loss at onset. Fibrinogen exhibited the strongest correlation among test findings at onset. The B/F ratio may help differentiate PPH from DIC-type AFE and diagnose clinical AFE, facilitating optimal replacement of coagulation factors during the early stages.
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Summary of clinically diagnosed amniotic fluid embolism cases in Korea and disagreement with 4 criteria proposed for research purpose. Obstet Gynecol Sci 2020; 64:190-200. [PMID: 33445819 PMCID: PMC7991002 DOI: 10.5468/ogs.20195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Accepted: 10/21/2020] [Indexed: 11/08/2022] Open
Abstract
OBJECTIVE This study aimed 1) to investigate the clinical characteristics of amniotic fluid embolism (AFE) cases clinically diagnosed by maternal fetal medicine (MFM) specialists in Korea, 2) to check the disagreement with 4 recently proposed criteria by the Society for Maternal-Fetal Medicine (SMFM) for research purpose, and 3) to compare maternal outcomes between cases satisfying all 4 criteria and cases with at least 1 missing criterion. METHODS This study included 12 patients clinically diagnosed with AFE from 7 referral hospitals in Korea. We collected information, including maternal age, symptoms of AFE, the amount of transfusion, and maternal mortality. RESULTS The median maternal age was 33 years (range, 28-40 years). Regarding symptoms, cardiovascular arrest, hypotension, respiratory compromise, clinical coagulopathy, and neurologic signs were observed in 41.7%, 83.3%, 83.3%, 100%, and 66.7% of the cases, respectively. Among the 12 cases, 5 women died and 2 suffered severe neurologic disability, showing an intact survival rate of 41.7%. Disagreement with all 4 criteria proposed by the SMFM was found in 66.7% of the cases, due to the lack of criteria for disseminated intravascular coagulation or strict onset time (<30 minutes after delivery). There was no difference in maternal mortality and the amount of transfusion between cases satisfying all 4 criteria and cases with at least 1 missing criterion. CONCLUSION Two-thirds of clinically confirmed AFE cases did not satisfy all 4 criteria proposed by the SMFM, despite similar rates of maternal mortality with cases satisfying all 4 criteria. Our study suggests that there may be some discrepancy between the clinical diagnosis of AFE and the recent diagnostic criteria proposed by the SMFM for research purpose.
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Evaluation of the 4 diagnosis criteria proposed by the SMFM and the AFE foundation for amniotic fluid embolism in a monocentric population. J Gynecol Obstet Hum Reprod 2020; 49:101821. [DOI: 10.1016/j.jogoh.2020.101821] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2020] [Revised: 05/07/2020] [Accepted: 05/22/2020] [Indexed: 11/22/2022]
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Kobayashi H, Akasaka J, Naruse K, Sado T, Tsunemi T, Niiro E, Iwai K. Comparison of the Different Definition Criteria for the Diagnosis of Amniotic Fluid Embolism. J Clin Diagn Res 2017; 11:QC18-QC21. [PMID: 28892982 DOI: 10.7860/jcdr/2017/26746.10283] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Accepted: 06/24/2017] [Indexed: 11/24/2022]
Abstract
INTRODUCTION There are several sets of criteria for the diagnosis of Amniotic Fluid Embolism (AFE), but little is known about their degree of agreement. AIM To evaluate the concordance of the Japan criteria for AFE in comparison with two definitions: the US AFE registration entry criteria (the US criteria) and UK Obstetric Surveillance System criteria for defining cases of amniotic fluid embolism (the UK criteria). MATERIALS AND METHODS A retrospective observational study was conducted in which the AFE cases registered in the Obstetrical Gynaecological Society of Kinki District in Japan for the period of April 2005 to December 2012 have been analysed by the expert steering obstetric committee, organized by the members of the Obstetric Research group. Cohen's kappa coefficient was used to calculate the agreement among three clinical diagnoses. For inter-group comparison, the Pearson Chi-square test was used (for categorical) and Mann-Whitney test was used (for continuous variables). RESULTS Among the 26 cases registered for this period, a total of 18 women were selected as having AFE according to the Japan criteria. Five women died (case fatality rate 27.8%). Agreement between the Japan criteria and the US and UK criteria was k = 0.453 and k = 0.538, respectively, reflecting moderate agreement. However, only 38.9% were given a diagnosis of AFE according to all three criteria. The factor that most often caused disagreement in diagnosis between the Japan criteria and the US criteria was "onset within 30 minutes postpartum". The UK criteria excluded "women with postpartum haemorrhage as the first presenting feature in whom there was no evidence of cardiorespiratory compromise". The case fatality rates in US and UK are higher than in Japan (50.0% and 38.5% vs 27.8%), but this did not result in a significant difference (p=0.497). CONCLUSION The groups of subjects identified as having AFE by the Japan criteria had a medium agreement with the US (k=0.453) or UK criteria (k=0.538). These three definition criteria identified different subgroups of patients. Such disagreement has serious implications for research and treatment.
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Affiliation(s)
- Hiroshi Kobayashi
- Department of Obstetrics and Gynaecology, Nara Medical University, Nara, Japan
| | - Juria Akasaka
- Department of Obstetrics and Gynaecology, Nara Medical University, Nara, Japan
| | - Katsuhiko Naruse
- Department of Obstetrics and Gynaecology, Nara Medical University, Nara, Japan
| | - Toshiyuki Sado
- Department of Obstetrics and Gynaecology, Nara Medical University, Nara, Japan
| | - Taihei Tsunemi
- Department of Obstetrics and Gynaecology, Nara Medical University, Nara, Japan
| | - Emiko Niiro
- Department of Obstetrics and Gynaecology, Nara Medical University, Nara, Japan
| | - Kana Iwai
- Department of Obstetrics and Gynaecology, Nara Medical University, Nara, Japan
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Abstract
Amniotic fluid embolism (AFE) is one of the catastrophic complications of pregnancy in which amniotic fluid, fetal cells, hair, or other debris enters into the maternal pulmonary circulation, causing cardiovascular collapse. Etiology largely remains unknown, but may occur in healthy women during labour, during cesarean section, after abnormal vaginal delivery, or during the second trimester of pregnancy. It may also occur up to 48 hours post-delivery. It can also occur during abortion, after abdominal trauma, and during amnio-infusion. The pathophysiology of AFE is not completely understood. Possible historical cause is that any breach of the barrier between maternal blood and amniotic fluid forces the entry of amniotic fluid into the systemic circulation and results in a physical obstruction of the pulmonary circulation. The presenting signs and symptoms of AFE involve many organ systems. Clinical signs and symptoms are acute dyspnea, cough, hypotension, cyanosis, fetal bradycardia, encephalopathy, acute pulmonary hypertension, coagulopathy etc. Besides basic investigations lung scan, serum tryptase levels, serum levels of C3 and C4 complements, zinc coproporphyrin, serum sialyl Tn etc are helpful in establishing the diagnosis. Treatment is mainly supportive, but exchange transfusion, extracorporeal membrane oxygenation, and uterine artery embolization have been tried from time to time. The maternal prognosis after amniotic fluid embolism is very poor though infant survival rate is around 70%.
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Affiliation(s)
- Kiranpreet Kaur
- Department of Anaesthesiology and Critical Care, Pt. B.D. Sharma PGIMS, Rohtak, Haryana, India
| | - Mamta Bhardwaj
- Department of Anaesthesiology and Critical Care, Pt. B.D. Sharma PGIMS, Rohtak, Haryana, India
| | - Prashant Kumar
- Department of Anaesthesiology and Critical Care, Pt. B.D. Sharma PGIMS, Rohtak, Haryana, India
| | - Suresh Singhal
- Department of Anaesthesiology and Critical Care, Pt. B.D. Sharma PGIMS, Rohtak, Haryana, India
| | - Tarandeep Singh
- Department of Anaesthesiology and Critical Care, Pt. B.D. Sharma PGIMS, Rohtak, Haryana, India
| | - Sarla Hooda
- Department of Anaesthesiology and Critical Care, Pt. B.D. Sharma PGIMS, Rohtak, Haryana, India
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Umazume T, Morikawa M, Yamada T, Akaishi R, Koyama T, Minakami H. Protein S deficiency present in a pregnant woman with dyspnea, abdominal pains, restlessness, agitation and hypofibrinogenemia. Clin Case Rep 2015; 3:213-6. [PMID: 25914811 PMCID: PMC4405304 DOI: 10.1002/ccr3.200] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2014] [Revised: 11/04/2014] [Accepted: 12/07/2014] [Indexed: 12/19/2022] Open
Abstract
Hypofibrinogenemia is rare in pulmonary thromboembolism. A pregnant woman with dyspnea, abdominal pain, restlessness, agitation and protein S deficiency exhibited normal blood oxygenation and high D-dimer (370 μg/mL) and undetectable fibrinogen levels in the blood. The pathogenesis responsible for present findings may have some features similar to amniotic fluid embolism.
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Affiliation(s)
- Takeshi Umazume
- Department of Obstetrics, Hokkaido University Graduate School of Medicine Sapporo, 060-8638, Japan
| | - Mamoru Morikawa
- Department of Obstetrics, Hokkaido University Graduate School of Medicine Sapporo, 060-8638, Japan
| | - Takahiro Yamada
- Department of Obstetrics, Hokkaido University Graduate School of Medicine Sapporo, 060-8638, Japan
| | - Rina Akaishi
- Department of Obstetrics, Hokkaido University Graduate School of Medicine Sapporo, 060-8638, Japan
| | - Takahiro Koyama
- Department of Obstetrics, Hokkaido University Graduate School of Medicine Sapporo, 060-8638, Japan
| | - Hisanori Minakami
- Department of Obstetrics, Hokkaido University Graduate School of Medicine Sapporo, 060-8638, Japan
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Abstract
BACKGROUND The first case report to describe amniotic fluid embolism that appeared in 1926 in Basil-Medico is translated from Portuguese to English. CASE A patient with a dead fetus for several weeks, presented in labor and died suddenly with fetal squames evident in the maternal pulmonary vasculature at autopsy. CONCLUSION As can be seen from the translation, this case report is remarkably similar in many of its features to some of the eight patients described 15 years later in the first English language discussion of the disease by Steiner and Luschbaugh in JAMA. An enigma presented by this first case remains today: fetal material in the maternal pulmonary vasculature appears specific for amniotic fluid embolism at autopsy but not in living patients.
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Affiliation(s)
- A Rafael
- Centro Hospitalar e Universitario de Coimbra, Portugal
| | - MD Benson
- Department of Obstetrics and Gynecology, Feinberg School of Medicine, Northwestern University, Deerfield, IL, USA
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Rath WH, Hofer S, Sinicina I. Amniotic fluid embolism: an interdisciplinary challenge: epidemiology, diagnosis and treatment. DEUTSCHES ARZTEBLATT INTERNATIONAL 2014; 111:126-32. [PMID: 24622759 PMCID: PMC3959223 DOI: 10.3238/arztebl.2014.0126] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Revised: 11/27/2013] [Accepted: 11/27/2013] [Indexed: 12/25/2022]
Abstract
BACKGROUND Amniotic fluid embolism (AFE) is a life-threatening obstetric complication that arises in 2 to 8 of every 100 000 deliveries. With a mortality of 11% to 44%, it is among the leading direct causes of maternal death. This entity is an interdisciplinary challenge because of its presentation with sudden cardiac arrest without any immediately obvious cause, the lack of specific diagnostic tests, the difficulty of establishing the diagnosis and excluding competing diagnoses, and the complex treatment required, including cardio - pulmonary resuscitation. METHOD We selectively reviewed pertinent literature published from 2000 to May 2013 that was retrieved by a PubMed search. RESULTS The identified risk factors for AFE are maternal age 35 and above (odds ratio [OR] 1.86), Cesarean section (OR 12.4), placenta previa (OR 10.5), and multiple pregnancy (OR 8.5). AFE is diagnosed on clinical grounds after the exclusion of other causes of acute cardiovascular decompensation during delivery, such as pulmonary thromboembolism or myocardial infarction. Its main clinical features are severe hypotension, arrhythmia, cardiac arrest, pulmonary and neurological manifestations, and profuse bleeding because of disseminated intravascular coagulation and/or hyperfibrinolysis. Its treatment requires immediate, optimal interdisciplinary cooperation. Low-level evidence favors treating women suffering from AFE by securing the airway, adequate oxygenation, circulatory support, and correction of hemostatic disturbances. The sudden, unexplained death of a pregnant woman necessitates a forensic autopsy. The histological or immunohistochemical demonstration of formed amniotic fluid components in the pulmonary bloodflow establishes the diagnosis of AFE. CONCLUSION AFE has become more common in recent years, for unclear reasons. Rapid diagnosis and immediate interdisciplinary treatment are essential for a good outcome. Establishing evidence-based recommendations for intervention is an important goal for the near future.
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Affiliation(s)
- Werner H Rath
- Faculty of Medicine, Gynecology and Obstetrics, University Hospital RWTH Aachen
| | - Stefan Hofer
- Department of Anesthesiology, University of Heidelberg
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Baghirzada L, Balki M. Maternal cardiac arrest in a tertiary care centre during 1989-2011: a case series. Can J Anaesth 2013; 60:1077-84. [DOI: 10.1007/s12630-013-0021-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2012] [Accepted: 08/14/2013] [Indexed: 10/26/2022] Open
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Chen KB, Chang SS, Tseng YL, Chiu TH, Liao CC, Ho M, Huang GS, Li CY. Amniotic fluid induces platelet-neutrophil aggregation and neutrophil activation. Am J Obstet Gynecol 2013; 208:318.e1-7. [PMID: 23313310 DOI: 10.1016/j.ajog.2013.01.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2012] [Revised: 11/02/2012] [Accepted: 01/07/2013] [Indexed: 01/20/2023]
Abstract
OBJECTIVE Amniotic fluid embolism syndrome is a fatal disease in pregnant women. The exact role of platelets and neutrophils in amniotic fluid embolism syndrome is not clear. We examined whether amniotic fluid could affect platelet-neutrophil aggregation and activation and the possible mechanisms. STUDY DESIGN Blood samples from the pregnant women were pretreated ex vivo with their own amniotic fluid. Flow cytometry was used to measure platelet-neutrophil aggregation and activation. Neutrophil-mediated activity of p38 mitogen-activated protein kinase and extracellular signal-regulated protein kinases 1 and 2 was analyzed by Western blotting. RESULTS Amniotic fluid significantly induced platelet-neutrophil aggregation, neutrophil CD11b expression, and reactive oxygen species production. Amniotic fluid induced minimal platelet P-selectin expression. The increase of intracellular calcium level of neutrophils and the activity of p38 mitogen-activated protein kinase were enhanced by amniotic fluid stimulation. CONCLUSION Amniotic fluid was able to induce neutrophil activation and platelet-neutrophil aggregation with minimal effect on platelet activation. These findings may provide a new insight in the understanding of the pathophysiologic condition of amniotic fluid embolism syndrome.
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Collins N, Bloor M, McDonnell N. Hyperfibrinolysis diagnosed by rotational thromboelastometry in a case of suspected amniotic fluid embolism. Int J Obstet Anesth 2013; 22:71-6. [DOI: 10.1016/j.ijoa.2012.09.008] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/10/2012] [Revised: 09/11/2012] [Accepted: 09/22/2012] [Indexed: 10/27/2022]
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Successful resuscitation following amniotic fluid embolism in a patient undergoing induction of labour for late miscarriage. Int J Obstet Anesth 2012; 21:202-3. [PMID: 22405979 DOI: 10.1016/j.ijoa.2012.01.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/20/2011] [Revised: 01/25/2012] [Accepted: 01/31/2012] [Indexed: 11/21/2022]
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Autologous blood in obstetrics: where are we going now? BLOOD TRANSFUSION = TRASFUSIONE DEL SANGUE 2011; 10:125-47. [PMID: 22044959 DOI: 10.2450/2011.0010-11] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Subscribe] [Scholar Register] [Received: 01/29/2011] [Accepted: 06/06/2011] [Indexed: 11/21/2022]
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Current concepts of immunology and diagnosis in amniotic fluid embolism. Clin Dev Immunol 2011; 2012:946576. [PMID: 21969840 PMCID: PMC3182579 DOI: 10.1155/2012/946576] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2011] [Accepted: 08/03/2011] [Indexed: 11/18/2022]
Abstract
Amniotic fluid embolism (AFE) is one of the leading causes of maternal mortality and morbidity in developed countries. Current thinking about pathophysiology has shifted away from embolism toward a maternal immune response to the fetus. Two immunologic mechanisms have been studied to date. Anaphylaxis appears to be doubtful while the available evidence supports a role for complement activation. With the mechanism remaining to be elucidated, AFE remains a clinical diagnosis. It is diagnosed based on one or more of four key signs/symptoms: cardiovascular collapse, respiratory distress, coagulopathy, and/or coma/seizures. The only laboratory test that reliably supports the diagnosis is the finding of fetal material in the maternal pulmonary circulation at autopsy. Perhaps the most compelling mystery surrounding AFE is not why one in 20,000 parturients are afflicted, but rather how the vast majority of women can tolerate the foreign antigenic presence of their fetus both within their uterus and circulation?
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Liumbruno GM, Meschini A, Liumbruno C, Rafanelli D. The introduction of intra-operative cell salvage in obstetric clinical practice: a review of the available evidence. Eur J Obstet Gynecol Reprod Biol 2011; 159:19-25. [PMID: 21742428 DOI: 10.1016/j.ejogrb.2011.06.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2011] [Revised: 05/13/2011] [Accepted: 06/09/2011] [Indexed: 10/18/2022]
Abstract
Intra-operative blood salvage is common practice in many surgical specialties but its safety is questioned with concerns about the risks of contamination of recovered blood with amniotic fluid and of maternal-foetal alloimmunization. However, the role of cell salvage as a blood-saving measure in this clinical setting is progressively acquiring relevance thanks to the growing body of evidence regarding its quality and safety. Modern cell savers remove most particulate contaminants and leukodepletion filtering of salvaged blood prior to transfusion adds further safety to this technique. Amniotic fluid embolism is no longer regarded as an embolic disease and the contamination of the salvaged blood by foetal Rh-mismatched red blood cells can be dealt with using anti-D immunoglobulin; ABO incompatibility tends to be a minor problem since ABO antigens are not fully developed at birth. Maternal alloimmunization can be caused also by other foetal red cell antigens, but it should also be noted that the risk of alloimmunization of the mother from allogeneic transfusion may be even greater. Therefore the use of cell savers in obstetric clinical practice should be considered in patients at high risk for haemorrhage or in cases where allogeneic blood transfusion is difficult or impossible.
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Affiliation(s)
- Giancarlo Maria Liumbruno
- UOC Immunoematologia e Medicina Trasfusionale, San Giovanni Calibita Fatebenefratelli Hospital, AFAR, Rome, Italy.
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Liumbruno GM, Liumbruno C, Rafanelli D. Intraoperative cell salvage in obstetrics: is it a real therapeutic option? Transfusion 2011; 51:2244-56. [DOI: 10.1111/j.1537-2995.2011.03116.x] [Citation(s) in RCA: 31] [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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