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Afsar B, Elsurer Afsar R. The dilemma of sodium intake in preeclampsia: beneficial or detrimental? Nutr Rev 2024; 82:437-449. [PMID: 37330671 DOI: 10.1093/nutrit/nuad066] [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] [Indexed: 06/19/2023] Open
Abstract
Preeclampsia (PE) is a disorder involving de novo development of hypertension plus end organ damage after 20 weeks of gestation. PE is considered to be a heterogeneous disease. There are 2 main types of PE: early-onset (<34 weeks of gestation), which is considered to be a placental disorder and is associated with vasoconstriction, low cardiac output, and placental hypoperfusion and organ damage due to decreased microcirculation to maternal organs; and late-onset PE, which is primarily a disorder of pregnant women with obesity, diabetes, and/or cardiovascular abnormalities. In late-onset PE, there is avid sodium reabsorption by the maternal kidneys, causing hypervolemia and increased cardiac output, along with vasodilatation causing venous congestion of organs. Although PE has been a well-known disease for a long time, it is interesting to note that there is no specific sodium (salt) intake recommendation for these patients. This may be due to the fact that studies since as far back as the 1900s have shown conflicting results, and the reasons for the inconsistent findings have not been fully explained; furthermore, the type of PE in these studies was not specifically defined. Some studies suggest that sodium restriction may be detrimental in early-onset PE, but may be feasible in late-onset PE. To explore this paradox, the current review explains the hemodynamic factors involved in these 2 types of PE, summarizes the findings of the current studies, and highlights the knowledge gaps and the research needed to determine whether increase or restriction of salt or sodium intake is beneficial in different types of PE.
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Affiliation(s)
- Baris Afsar
- Department of Nephrology, Suleyman Demirel University School of Medicine, Isparta, Turkey
| | - Rengin Elsurer Afsar
- Department of Nephrology, Suleyman Demirel University School of Medicine, Isparta, Turkey
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Maharani ARK, Mardiana N. A pregnancy with nephrotic syndrome: A rare case. Int J Surg Case Rep 2022; 99:107707. [PMID: 36261937 PMCID: PMC9568871 DOI: 10.1016/j.ijscr.2022.107707] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2022] [Revised: 09/20/2022] [Accepted: 09/24/2022] [Indexed: 12/03/2022] Open
Abstract
Introduction Systemic lupus erythematosus (SLE) found during pregnancy is often flared SLE. Case presentation This study reported a 23-year-old woman diagnosed with nephrotic syndrome with an 18/19-week pregnancy. The cause of nephrotic syndrome must be established by ruling out all possible secondary causes, especially in pregnancy with preeclampsia which can also occur with proteinuria. In lupus nephritis, renal biopsy as the standard gold examination plays a role in determining further management and the prognosis of the patient's future renal function. A kidney biopsy is recommended if the urinary protein excretion exceeds 500 mg/24 h with the aim of early detection and treatment to prevent long-term complications to the kidneys. Discussion Management of nephrotic syndrome in pregnancy used corticosteroid and immunosuppressive. Conclusion Pregnancy prognosis in women with active SLE is generally poor, with a high risk of miscarriage. SLE flares occur in pregnancy. Immunosuppressant therapy is the primary treatment. Nephrotic syndrome in pregnancy has a poor prognosis.
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Affiliation(s)
- Andi Ratna Kartika Maharani
- Department of Internal Medicine, Faculty of Medicine, Universitas Airlangga - Dr. Soetomo General Academic Hospital, Surabaya, Indonesia
| | - Nunuk Mardiana
- Department of Internal Medicine, Faculty of Medicine, Universitas Airlangga - Dr. Soetomo General Academic Hospital, Surabaya, Indonesia.
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Tamás P, Kovács K, Várnagy Á, Farkas B, Alemu Wami G, Bódis J. Preeclampsia subtypes: Clinical aspects regarding pathogenesis, signs, and management with special attention to diuretic administration. Eur J Obstet Gynecol Reprod Biol 2022; 274:175-181. [PMID: 35661540 DOI: 10.1016/j.ejogrb.2022.05.033] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Revised: 05/18/2022] [Accepted: 05/27/2022] [Indexed: 11/04/2022]
Abstract
During normal pregnancy, blood volume increases by nearly two liters. Distinctively, the absence coupled with the extreme extent regarding the volume expansion, are likely accompanied with pathological conditions. Undoubtedly, preeclampsia, defined as the appearance of hypertension and organ deficiency, such as proteinuria during the second half of pregnancy, is not a homogenous disease. Clinically speaking, two main types of preeclampsia can be distinguished, in which a marked difference between them is vascular condition, and consequently, the blood volume. The "classic" preeclampsia, as a two-phase disease, described in the first, latent phase, in which, placenta development is diminished. Agents from this malperfused placenta generate a maternal disease, the second phase, in which endothelial damage leads to hypertension and organ damage due to vasoconstriction and thrombotic microangiopathy. In this hypovolemia-associated condition, decreasing platelet count, signs of hemolysis, renal and liver involvement are characteristic findings; proteinuria is marked and increasing. In the terminal phase, visible edema develops due to increasing capillary transparency, augmenting end-organ damages. "Classic" preeclampsia is a severe and quickly progressing condition with placental insufficiency and consequent fetal growth restriction and oligohydramnios. The outcome of this condition often leads to fetal hypoxia, eclampsia or placental abruption. The management is limited to a diligent prolongation of pregnancy to accomplish improved neonatal pulmonary function, careful diminishing high blood pressure, and delivery induction in due time. The other subtype, associated with relaxed vasculature and high cardiac output, is a maternal disease, in which obesity is an important risk factor since predisposes to enhanced water retention, hypertension, and a weakened endothelial dysfunction. Initially, enhanced water retention leads to lowered extremity edema, which oftentimes progresses to a generalized form and hypertension. In several cases, proteinuria appears most likely due to tissue edema. This condition already fully meets preeclampsia criteria. Laboratory alterations, including proteinuria, are modest and platelet count remains within the normal range. Fetal weight is also normal or frequently over average due to enhanced placental blood supply. It is very likely, further water retention leads to venous congestion, a parenchyma stasis, responsible for ascites, eclampsia, or placental abruption. During the management of this hypervolemia-associated preeclampsia, the administration of diuretic furosemide treatment seemingly offers promise.
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Affiliation(s)
- Péter Tamás
- National Laboratory for Human Reproduction, University of Pécs, Pécs, Hungary; Department of Obstetrics and Gynaecology, Medical School, University of Pécs, Pécs, Hungary; Doctoral School of Health Sciences, Faculty of Health Sciences, University of Pécs, Pécs, Hungary; Institute of Emergency Care and Pedagogy of Health, Faculty of Health Sciences, University of Pécs, Pécs, Hungary.
| | - Kálmán Kovács
- National Laboratory for Human Reproduction, University of Pécs, Pécs, Hungary; Department of Obstetrics and Gynaecology, Medical School, University of Pécs, Pécs, Hungary; Hungarian Academy of Sciences - University of Pécs Human Reproduction Scientific Research Group, University of Pécs, Pécs, Hungary
| | - Ákos Várnagy
- National Laboratory for Human Reproduction, University of Pécs, Pécs, Hungary; Department of Obstetrics and Gynaecology, Medical School, University of Pécs, Pécs, Hungary; Hungarian Academy of Sciences - University of Pécs Human Reproduction Scientific Research Group, University of Pécs, Pécs, Hungary
| | - Bálint Farkas
- National Laboratory for Human Reproduction, University of Pécs, Pécs, Hungary; Department of Obstetrics and Gynaecology, Medical School, University of Pécs, Pécs, Hungary; Hungarian Academy of Sciences - University of Pécs Human Reproduction Scientific Research Group, University of Pécs, Pécs, Hungary
| | - Girma Alemu Wami
- Doctoral School of Health Sciences, Faculty of Health Sciences, University of Pécs, Pécs, Hungary
| | - József Bódis
- National Laboratory for Human Reproduction, University of Pécs, Pécs, Hungary; Department of Obstetrics and Gynaecology, Medical School, University of Pécs, Pécs, Hungary; Doctoral School of Health Sciences, Faculty of Health Sciences, University of Pécs, Pécs, Hungary; Hungarian Academy of Sciences - University of Pécs Human Reproduction Scientific Research Group, University of Pécs, Pécs, Hungary
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Siegmund AS, Pieper PG, Bilardo CM, Gordijn SJ, Khong TY, Gyselaers W, van Veldhuisen DJ, Dickinson MG. Cardiovascular determinants of impaired placental function in women with cardiac dysfunction. Am Heart J 2022; 245:126-135. [PMID: 34902313 DOI: 10.1016/j.ahj.2021.11.020] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/18/2021] [Revised: 11/16/2021] [Accepted: 11/19/2021] [Indexed: 01/22/2023]
Abstract
Female heart disease has for a long time been an underrecognized problem in the field of cardiology. With an ever-growing number of these patients getting pregnant, cardiac dysfunction during pregnancy is an increasingly large medical problem. Previous work has shown that maternal heart disease may have an adverse effect on pregnancy outcome in both mother and child. The placenta forms the connection and it is postulated that cardiac dysfunction negatively affects the placenta, and consequently, neonatal outcome. Given the paucity of data in this field, more research on the influence of cardiac (mal)function on placental (mal)function is needed. The present review describes placental function in women with various types of cardiac dysfunction, thereby aiming to provide more insight into possible underlying mechanisms of placental malfunction. Organ dysfunction in patients with heart failure is for an important part based on reduced perfusion and venous congestion. This has been shown in other organs such as kidneys, liver and brain. In pregnant women with cardiac dysfunction, placental dysfunction may follow similar patterns. Moreover, other factors, such as pre-existing hypertension and chronic hypoxia may lead to further impairment of placental function, through abnormal vascular remodeling of the uterine spiral arteries. The pathophysiology of placental dysfunction in pregnant women with cardiac dysfunction may thus be multifactorial. It is therefore important to monitor closely cardiac and placental function in such high-risk pregnancies. Gaining a better understanding of the underlying pathophysiological mechanisms may have important clinical implications in terms of pregnancy counseling, monitoring and outcome.
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Effect of cryoprecipitate transfusion therapy in patients with postpartum hemorrhage: a retrospective cohort study. Sci Rep 2021; 11:18458. [PMID: 34531466 PMCID: PMC8445974 DOI: 10.1038/s41598-021-97954-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Accepted: 08/30/2021] [Indexed: 11/08/2022] Open
Abstract
To evaluate the effect of cryoprecipitate (CRYO) transfusion in women referred for postpartum hemorrhage (PPH). This retrospective cohort study included patients with primary PPH referred to Gifu University Hospital between April 2013 and March 2020. We analyzed the effect of CRYO transfusion on fluid balance 24 h after the initial examination using a multivariable linear regression model adjusted for several confounding variables. To evaluate whether outcomes were modified by active bleeding, an interaction term of CRYO*active bleeding was incorporated into the multivariable model. We identified 157 women: 38 in the CRYO group (cases) and 119 in the control group. Fluid balance in the aforementioned period tended to decrease in the CRYO group compared with that in the control group (coefficient - 398.91; 95% CI - 1298.08 to + 500.26; p = 0.382). Active bleeding on contrast-enhanced computed tomography affected the relationship between CRYO transfusion and fluid balance (p = 0.016). Other outcomes, except for the overall transfusion requirement, were not significantly different; however, the interaction effect of active bleeding was significant (p = 0.016). CRYO transfusion may decrease the fluid balance in the first 24 h in PPH patients, especially in those without active bleeding.
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Gyselaers W. Preeclampsia Is a Syndrome with a Cascade of Pathophysiologic Events. J Clin Med 2020; 9:jcm9072245. [PMID: 32679789 PMCID: PMC7409017 DOI: 10.3390/jcm9072245] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Revised: 07/05/2020] [Accepted: 07/13/2020] [Indexed: 12/12/2022] Open
Abstract
This review integrates the currently available information on the molecular, cellular, and systemic mechanisms involved in the pathophysiology of preeclampsia. It highlights that the growth, protection, and promotion of the conceptus requires the modulation of an intact maternal immune system, communication between the mother and fetus, and adaptation of the maternal organic functions. A malfunction in any of these factors, on either side, will result in a failure of the cascade of events required for the normal course of pregnancy. Maladaptive processes, initially aiming to protect the conceptus, fail to anticipate the gradually increasing cardiovascular volume load during the course of pregnancy. As a result, multiple organ dysfunctions install progressively and eventually reach a state where mother and/or fetus are at risk of severe morbidity or even mortality, and where the termination of pregnancy becomes the least harmful solution. The helicopter view on pathophysiologic processes associated with preeclampsia, as presented in this paper, illustrates that the etiology of preeclampsia cannot be reduced to one single mechanism, but is to be considered a cascade of consecutive events, fundamentally not unique to pregnancy.
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Affiliation(s)
- Wilfried Gyselaers
- Department Obstetrics, Ziekenhuis Oost Limburg, B3600 Genk, Belgium; ; Tel.: +32-89-306420
- Department Physiology, Hasselt University, B3590 Diepenbeek, Belgium
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Bellos I, Pergialiotis V. Doppler parameters of renal hemodynamics in women with preeclampsia: A systematic review and meta-analysis. J Clin Hypertens (Greenwich) 2020; 22:1134-1144. [PMID: 32644302 DOI: 10.1111/jch.13940] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2020] [Revised: 05/15/2020] [Accepted: 05/25/2020] [Indexed: 12/17/2022]
Abstract
The present meta-analysis aims to compare renal arterial and venous Doppler parameters in women with preeclampsia and healthy pregnant controls. Medline, Scopus, Cochrane Central Register of Controlled Trials, Clinicaltrials.gov, and Google Scholar databases were systematically searched from inception to December 04, 2019. All observational studies reporting renal resistive index, pulsatility index, renal interlobar vein impedance, or pulse transit time among preeclamptic and healthy pregnant women were held eligible. Subgroup analysis was conducted on the basis of disease onset and side of measurement. Both pair-wise and network meta-analysis were performed using Review Manager 5.3 and R-3.4.3 software. Fourteen studies were included, with a total of 1118 women. No difference of renal resistive (MD: 0.00, 95% CI: [-0.03, 0.04]) and pulsatility index (MD: -0.01, 95% CI: [-0.14, 0.12]) was evident between the two groups. Renal interlobar vein impedance was estimated to be significantly higher in preeclampsia (MD: 0.07, 95% CI: [0.06, 0.09]), while venous pulse transit time was significantly lower (MD: -0.10, 95% CI: [-0.14, -0.05]) in women with the disease. Subgroup analysis indicated that early-onset preeclampsia was associated with significantly elevated renal interlobar vein impedance and lower venous pulse transit time than late-onset disease. The outcomes of the present meta-analysis suggest that preeclampsia is characterized by venous hemodynamic dysfunction as it is associated with significantly elevated renal interlobar vein impedance and shorter venous pulse transit time. Future large-scale prospective studies should introduce cutoff values and determine the optimal timing of measurement in order to achieve optimal predictive accuracy.
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Affiliation(s)
- Ioannis Bellos
- Laboratory of Experimental Surgery and Surgical Research N.S. Christeas, Athens University Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Vasilios Pergialiotis
- Laboratory of Experimental Surgery and Surgical Research N.S. Christeas, Athens University Medical School, National and Kapodistrian University of Athens, Athens, Greece
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Peripheral Blood Flow Intensity in Maternal Kidneys and Correlation with Blood Pressure. MATERNAL-FETAL MEDICINE 2020. [DOI: 10.1097/fm9.0000000000000039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Dreesen P, Schoutteten MK, Vande Velde N, Kaminski I, Heylen L, De Moor B, Malbrain ML, Gyselaers W. Increased Intra-Abdominal Pressure During Laparoscopic Pneumoperitoneum Enhances Albuminuria via Renal Venous Congestion, Illustrating Pathophysiological Aspects of High Output Preeclampsia. J Clin Med 2020; 9:jcm9020487. [PMID: 32054051 PMCID: PMC7074134 DOI: 10.3390/jcm9020487] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Revised: 01/13/2020] [Accepted: 02/09/2020] [Indexed: 01/31/2023] Open
Abstract
Intra-abdominal hypertension (IAH) causes severe organ dysfunction. Our aim is to evaluate the effect of increased intra-abdominal pressure (IAP) on renal function, hypothesizing that venous congestion may increase proteinuria and fluid retention without endothelial dysfunction. Three urine samples were collected from 32 non-pregnant women undergoing laparoscopic-assisted vaginal hysterectomy (LAVH) and from 10 controls placed in Trendelenburg position for 60 min. Urine sampling was done before (PRE), during or immediately after (PER), and two hours after (POST) the procedure. Urinary albumin, protein and creatinine concentrations were measured in each sample, and ratios were calculated and compared within and between groups. During LAVH, the albumin/creatinine ratio (ACR) increased and persisted POST-procedure, which was not observed in controls. A positive correlation existed between the LAVH duration and the relative change in both ACR and protein/creatinine ratio (PCR) PER- and POST-procedure. Iatrogenic IAH increases urinary ACR and PCR in non-pregnant women via a process of venous congestion. This mechanism might explain the presentation of one specific subtype of late-onset preeclampsia, where no drop of maternal cardiac output is observed.
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Affiliation(s)
- Pauline Dreesen
- UHasselt—Hasselt University, Faculty of Medicine and Life Sciences, Department of Physiology, Limburg Clinical Research Center, 3590 Diepenbeek, Belgium
- Future Health, Ziekenhuis Oost-Limburg, 3600 Genk, Belgium
| | - Melanie K. Schoutteten
- UHasselt—Hasselt University, Faculty of Medicine and Life Sciences, Department of Physiology, Limburg Clinical Research Center, 3590 Diepenbeek, Belgium
- Future Health, Ziekenhuis Oost-Limburg, 3600 Genk, Belgium
- Department of Nephrology, Catharina Ziekenhuis, 5623 EJ Eindhoven, The Netherlands
| | - Nele Vande Velde
- UHasselt—Hasselt University, Faculty of Medicine and Life Sciences, Department of Physiology, Limburg Clinical Research Center, 3590 Diepenbeek, Belgium
| | - Iris Kaminski
- UHasselt—Hasselt University, Faculty of Medicine and Life Sciences, Department of Physiology, Limburg Clinical Research Center, 3590 Diepenbeek, Belgium
| | - Line Heylen
- UHasselt—Hasselt University, Faculty of Medicine and Life Sciences, Department of Physiology, Limburg Clinical Research Center, 3590 Diepenbeek, Belgium
- Department of Nephrology, Ziekenhuis Oost-Limburg, 3600 Genk, Belgium
| | - Bart De Moor
- UHasselt—Hasselt University, Faculty of Medicine and Life Sciences, Department of Physiology, Limburg Clinical Research Center, 3590 Diepenbeek, Belgium
- Department of Nephrology, Jessa Ziekenhuis, 3500 Hasselt, Belgium
| | - Manu L.N.G. Malbrain
- Department of Intensive Care, Universitair Ziekenhuis Brussel, 1090 Jette, Belgium
- Faculty of Medicine and Pharmacy, Vrije Universiteit Brussel, 1050 Brussels, Belgium
| | - Wilfried Gyselaers
- UHasselt—Hasselt University, Faculty of Medicine and Life Sciences, Department of Physiology, Limburg Clinical Research Center, 3590 Diepenbeek, Belgium
- Department of Obstetrics & Gynecology, Ziekenhuis Oost-Limburg, 3600 Genk, Belgium
- Correspondence: ; Tel.: +32-89327524
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Blood flow velocity comparison in the eye capillaries and postcapillary venules between normal pregnant and non-pregnant women. Microvasc Res 2020; 127:103926. [DOI: 10.1016/j.mvr.2019.103926] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Revised: 08/27/2019] [Accepted: 09/11/2019] [Indexed: 02/07/2023]
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Vonck S, Staelens AS, Lanssens D, Tomsin K, Oben J, Bruckers L, Gyselaers W. Development of a biophysical screening model for gestational hypertensive diseases. J Biomed Sci 2019; 26:38. [PMID: 31109316 PMCID: PMC6528347 DOI: 10.1186/s12929-019-0530-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2018] [Accepted: 05/05/2019] [Indexed: 02/08/2023] Open
Abstract
Background To investigate the possibility of using maternal biophysical parameters only in screening for the different types of gestational hypertensive diseases. Methods A total of 969 pregnant women were randomly screened in first and second trimester, of which 8 developed Early-onset Preeclampsia, 29 Late-onset Preeclampsia, 35 Gestational Hypertension and 897 women had a normal outcome. An observational maternal hemodynamics assessment was done via standardized electrocardiogram-Doppler ultrasonography, Impedance Cardiography and bio-impedance, acquiring functional information on heart, arteries, veins and body fluid. Preliminary prediction models were developed to test the screening potential for early preeclampsia, late preeclampsia and gestational hypertension using a Partial Least Square Discriminant Analysis. Results A combined model using maternal characteristics with cardiovascular parameters in first and second trimester offers high screening performance with Area Under the Curve of 99,9% for Early-onset Preeclampsia, 95,3% for Late-onset Preeclampsia and 94% for Gestational Hypertension. Conclusions Using biophysical parameters as fundament for a new prediction model, without the need of biochemical parameters, seems feasible. However, validation in a large prospective study will reveal its true potential.
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Affiliation(s)
- Sharona Vonck
- Faculty of Medicine and Life Sciences, Hasselt University, Agoralaan, 3590, Diepenbeek, Belgium. .,Department of Obstetrics & Gynaecology, Ziekenhuis Oost-Limburg, Schiepse Bos 6, 3600, Genk, Belgium.
| | - Anneleen S Staelens
- Department of Obstetrics & Gynaecology, Ziekenhuis Oost-Limburg, Schiepse Bos 6, 3600, Genk, Belgium
| | - Dorien Lanssens
- Faculty of Medicine and Life Sciences, Hasselt University, Agoralaan, 3590, Diepenbeek, Belgium.,Department of Obstetrics & Gynaecology, Ziekenhuis Oost-Limburg, Schiepse Bos 6, 3600, Genk, Belgium
| | - Kathleen Tomsin
- Department of Obstetrics & Gynaecology, Ziekenhuis Oost-Limburg, Schiepse Bos 6, 3600, Genk, Belgium
| | - Jolien Oben
- Department of Obstetrics & Gynaecology, Ziekenhuis Oost-Limburg, Schiepse Bos 6, 3600, Genk, Belgium
| | - Liesbeth Bruckers
- Interuniversity Institute for Biostatistics and statistical Bioinformatics, Hasselt University, Agoralaan, 3590, Diepenbeek, Belgium
| | - Wilfried Gyselaers
- Faculty of Medicine and Life Sciences, Hasselt University, Agoralaan, 3590, Diepenbeek, Belgium.,Department Physiology, Hasselt University, Agoralaan, 3590, Diepenbeek, Belgium
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