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Lacan L, Garabedian C, De Jonckheere J, Ghesquiere L, Storme L, Sharma D, Nguyen The Tich S. Fetal brain response to worsening acidosis: an experimental study in a fetal sheep model of umbilical cord occlusions. Sci Rep 2023; 13:23050. [PMID: 38155199 PMCID: PMC10754920 DOI: 10.1038/s41598-023-49495-2] [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: 03/15/2023] [Accepted: 12/08/2023] [Indexed: 12/30/2023] Open
Abstract
Perinatal anoxia remains an important public health problem as it can lead to hypoxic-ischaemic encephalopathy (HIE) and cause significant neonatal mortality and morbidity. The mechanisms of the fetal brain's response to hypoxia are still unclear and current methods of in utero HIE prediction are not reliable. In this study, we directly analysed the brain response to hypoxia in fetal sheep using in utero EEG. Near-term fetal sheep were subjected to progressive hypoxia induced by repeated umbilical cord occlusions (UCO) at increasing frequency. EEG changes during and between UCO were analysed visually and quantitatively, and related with gasometric and haemodynamic data. EEG signal was suppressed during occlusions and progressively slowed between occlusions with the increasing severity of the occlusions. Per-occlusion EEG suppression correlated with per-occlusion bradycardia and increased blood pressure, whereas EEG slowing and amplitude decreases correlated with arterial hypotension and respiratory acidosis. The suppression of the EEG signal during cord occlusion, in parallel with cardiovascular adaptation could correspond to a rapid cerebral adaptation mechanism that may have a neuroprotective role. The progressive alteration of the signal with the severity of the occlusions would rather reflect the cerebral hypoperfusion due to the failure of the cardiovascular adaptation mechanisms.
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Affiliation(s)
- Laure Lacan
- CHU Lille, Univ. Lille, ULR 2694 - METRICS, 59000, Lille, France.
- Department of Pediatric Neurology, CHU Lille, 59000, Lille, France.
- Department of Pediatric Neurology, Hôpital Roger Salengro, CHU Lille, Avenue du Professeur Emile Laine, 59037, Lille Cedex, France.
| | - Charles Garabedian
- CHU Lille, Univ. Lille, ULR 2694 - METRICS, 59000, Lille, France
- Department of Obstetrics, CHU Lille, 59000, Lille, France
| | - Julien De Jonckheere
- CHU Lille, Univ. Lille, ULR 2694 - METRICS, 59000, Lille, France
- CHU Lille, CIC-IT 1403, 59000, Lille, France
| | - Louise Ghesquiere
- CHU Lille, Univ. Lille, ULR 2694 - METRICS, 59000, Lille, France
- Department of Obstetrics, CHU Lille, 59000, Lille, France
| | - Laurent Storme
- CHU Lille, Univ. Lille, ULR 2694 - METRICS, 59000, Lille, France
- Department of Neonatology, CHU Lille, 59000, Lille, France
| | - Dyuti Sharma
- CHU Lille, Univ. Lille, ULR 2694 - METRICS, 59000, Lille, France
- Department of Pediatric Surgery, CHU Lille, 59000, Lille, France
| | - Sylvie Nguyen The Tich
- CHU Lille, Univ. Lille, ULR 2694 - METRICS, 59000, Lille, France
- Department of Pediatric Neurology, CHU Lille, 59000, Lille, France
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Chevalier G, Garabedian C, Pekar JD, Wojtanowski A, Le Hesran D, Galan LE, Sharma D, Storme L, Houfflin-Debarge V, De Jonckheere J, Ghesquière L. Early heart rate variability changes during acute fetal inflammatory response syndrome: An experimental study in a fetal sheep model. PLoS One 2023; 18:e0293926. [PMID: 38032884 PMCID: PMC10688759 DOI: 10.1371/journal.pone.0293926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Accepted: 10/21/2023] [Indexed: 12/02/2023] Open
Abstract
INTRODUCTION Fetal infection during labor with fetal inflammatory response syndrome (FIRS) is associated with neurodevelopmental disabilities, cerebral palsy, neonatal sepsis, and mortality. Current methods to diagnose FIRS are inadequate. Thus, the study aim was to explore whether fetal heart rate variability (HRV) analysis can be used to detect FIRS. MATERIAL AND METHODS In chronically instrumented near-term fetal sheep, lipopolysaccharide (LPS) was injected intravenously to model FIRS. A control group received saline solution injection. Hemodynamic, blood gas analysis, interleukin-6 (IL-6), and 14 HRV indices were recorded for 6 h. In both groups, comparisons were made between the stability phase and the 6 h following injection (H1-H6, respectively) and between LPS and control groups. RESULTS Fifteen lambs were instrumented. In the LPS group (n = 8), IL-6 increased significantly after LPS injection (p < 0.001), confirming the FIRS model. Fetal heart rate increased significantly after H5 (p < 0.01). In our FIRS model without shock or cardiovascular decompensation, five HRV measures changed significantly after H2 until H4 in comparison to baseline. Moreover, significant differences between LPS and control groups were observed in HRV measures between H2 and H4. These changes appear to be mediated by an increase of global variability and a loss of signal complexity. CONCLUSION As significant HRV changes were detected before FHR increase, these indices may be valuable for early detection of acute FIRS.
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Affiliation(s)
- Geoffroy Chevalier
- ULR 2694—METRICS—Evaluation des Technologies de Santé et des Pratiques Médicales, University Lille, CHU Lille, France
- Department of Obstetrics, CHU Lille, France
| | - Charles Garabedian
- ULR 2694—METRICS—Evaluation des Technologies de Santé et des Pratiques Médicales, University Lille, CHU Lille, France
- Department of Obstetrics, CHU Lille, France
| | | | | | | | | | - Dyuti Sharma
- ULR 2694—METRICS—Evaluation des Technologies de Santé et des Pratiques Médicales, University Lille, CHU Lille, France
- Department of Pediatric Surgery, CHU Lille, France
| | - Laurent Storme
- ULR 2694—METRICS—Evaluation des Technologies de Santé et des Pratiques Médicales, University Lille, CHU Lille, France
- Department of Neonatology, CHU Lille, France
| | - Veronique Houfflin-Debarge
- ULR 2694—METRICS—Evaluation des Technologies de Santé et des Pratiques Médicales, University Lille, CHU Lille, France
- Department of Obstetrics, CHU Lille, France
| | - Julien De Jonckheere
- ULR 2694—METRICS—Evaluation des Technologies de Santé et des Pratiques Médicales, University Lille, CHU Lille, France
- CIC-IT 1403, CHU Lille, France
| | - Louise Ghesquière
- ULR 2694—METRICS—Evaluation des Technologies de Santé et des Pratiques Médicales, University Lille, CHU Lille, France
- Department of Obstetrics, CHU Lille, France
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Turini L, Bonelli F, Lanatà A, Vitale V, Nocera I, Sgorbini M, Mele M. Validation of a new smart textiles biotechnology for heart rate variability monitoring in sheep. Front Vet Sci 2022; 9:1018213. [DOI: 10.3389/fvets.2022.1018213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Accepted: 10/26/2022] [Indexed: 11/23/2022] Open
Abstract
Robust Animal-Based Measures (ABMs) are fundamental in order to assess animal welfare, however in semi-extensive sheep farming systems is not easy to collect ABMs without inducing additional stress in the animals. Heart rate variability (HRV) is a non-invasive technique of assessing stress levels related to animal welfare. It is considered a sensitive indicator of the functional regulatory characteristics of the autonomic nervous system. Several studies investigated the use of HRV for welfare assessment in dairy cows while research on sheep is scarce. Moreover, assessing HRV in small ruminants at pasture is critical because of the lack of a solution adoptable for field conditions. This study aimed to evaluate if a smart textiles technology is comparable to a Standard base-apex electrocardiogram (ECG) for measuring HRV in small ruminants. Eight healthy Massese dairy sheep were recruited. Standard base-apex ECG and smart textiles technology (Smartex ECG) were simultaneously acquired for 5 min in the standing, unsedated, unclipped sheep. The ECG tracings were recorded when animals were standing quietly. The Bland-Altman test and the linear regression analysis were applied after parameter extraction in time, frequency, and non-linear methods to compare Smartex against standard base-apex ECG systems. The Bland-Altman test was applied to all HRV extracted parameters (Mean RR, pNN50, RMSSD, LF/HF, SampEn, SD1, SD2, stdRR) to evaluate the agreement between the two different instruments, and a linear regression analysis was performed to evaluate the relationship between the two methods. The smart textiles biotechnology was simple to wear and clean. It can be worn without using glue and without shaving the sheep's wool, limiting animal handling and stress. Bland Altman test reported a robust agreement between the two systems. In fact, the regression analysis of HRV parameters showed that half of the parameters recorded had an R2 coefficient >0.75. Results also showed a very small reproducibility coefficient that indicated that the two methods were really close to each other. Smartex textiles technology can be used for HRV evaluation in sheep species as a potential ABM for animal welfare assessment.
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Ghesquière L, Perbet R, Lacan L, Hamoud Y, Stichelbout M, Sharma D, Nguyen S, Storme L, Houfflin-Debarge V, De Jonckheere J, Garabedian C. Associations between fetal heart rate variability and umbilical cord occlusions-induced neural injury: An experimental study in a fetal sheep model. Acta Obstet Gynecol Scand 2022; 101:758-770. [PMID: 35502642 DOI: 10.1111/aogs.14352] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Revised: 02/27/2022] [Accepted: 03/07/2022] [Indexed: 11/29/2022]
Abstract
INTRODUCTION This study evaluated the association between fetal heart rate variability (HRV) and the occurrence of hypoxic-ischemic encephalopathy in a fetal sheep model. MATERIAL AND METHODS The experimental protocol created a hypoxic condition with repeated cord occlusions in three phases (A, B, C) to achieve acidosis to pH <7.00. Hemodynamic, gasometric and HRV parameters were analyzed during the protocol, and the fetal brain, brainstem and spinal cord were assessed histopathologically 48 h later. Associations between the various parameters and neural injury were compared between phases A, B and C using Spearman's rho test. RESULTS Acute anoxic-ischemic brain lesions in all regions was present in 7/9 fetuses, and specific neural injury was observed in 3/9 fetuses. The number of brainstem lesions correlated significantly and inversely with the HRV fetal stress index (r = -0.784; p = 0.021) in phase C and with HRV long-term variability (r = -0.677; p = 0.045) and short-term variability (r = -0.837; p = 0.005) in phase B. The number of neurological lesions did not correlate significantly with other markers of HRV. CONCLUSIONS Neural injury caused by severe hypoxia was associated with HRV changes; in particular, brainstem damage was associated with changes in fetal-specific HRV markers.
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Affiliation(s)
- Louise Ghesquière
- Evaluation of Health Technologies and Medical Practices (METRICS) - ULR 2694, University of Lille, Centre Hospitalier Universitaire de Lille, Lille, France.,Department of Obstetrics, Centre Hospitalier Universitaire de Lille, Lille, France
| | - Romain Perbet
- Department of Anatomopathology, Centre Hospitalier Universitaire de Lille, Lille, France
| | - Laure Lacan
- Evaluation of Health Technologies and Medical Practices (METRICS) - ULR 2694, University of Lille, Centre Hospitalier Universitaire de Lille, Lille, France.,Department of Neuropediatrics, Centre Hospitalier Universitaire de Lille, Lille, France
| | - Yasmine Hamoud
- Evaluation of Health Technologies and Medical Practices (METRICS) - ULR 2694, University of Lille, Centre Hospitalier Universitaire de Lille, Lille, France.,Department of Obstetrics, Centre Hospitalier Universitaire de Lille, Lille, France
| | - Morgane Stichelbout
- Department of Anatomopathology, Centre Hospitalier Universitaire de Lille, Lille, France
| | - Dyuti Sharma
- Evaluation of Health Technologies and Medical Practices (METRICS) - ULR 2694, University of Lille, Centre Hospitalier Universitaire de Lille, Lille, France.,Department of Pediatric Surgery, Centre Hospitalier Universitaire de Lille, Lille, France
| | - Sylvie Nguyen
- Evaluation of Health Technologies and Medical Practices (METRICS) - ULR 2694, University of Lille, Centre Hospitalier Universitaire de Lille, Lille, France.,Department of Neuropediatrics, Centre Hospitalier Universitaire de Lille, Lille, France
| | - Laurent Storme
- Evaluation of Health Technologies and Medical Practices (METRICS) - ULR 2694, University of Lille, Centre Hospitalier Universitaire de Lille, Lille, France.,Department of Neonatology, Centre Hospitalier Universitaire de Lille, Lille, France
| | - Véronique Houfflin-Debarge
- Evaluation of Health Technologies and Medical Practices (METRICS) - ULR 2694, University of Lille, Centre Hospitalier Universitaire de Lille, Lille, France.,Department of Obstetrics, Centre Hospitalier Universitaire de Lille, Lille, France
| | - Julien De Jonckheere
- Evaluation of Health Technologies and Medical Practices (METRICS) - ULR 2694, University of Lille, Centre Hospitalier Universitaire de Lille, Lille, France.,Clinical Investigation Center - Technological Innovation (CIC-IT 1403), Centre Hospitalier Universitaire de Lille, Lille, France
| | - Charles Garabedian
- Evaluation of Health Technologies and Medical Practices (METRICS) - ULR 2694, University of Lille, Centre Hospitalier Universitaire de Lille, Lille, France.,Department of Obstetrics, Centre Hospitalier Universitaire de Lille, Lille, France
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5
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Ghesquière L, Ternynck C, Sharma D, Hamoud Y, Vanspranghels R, Storme L, Houfflin-Debarge V, De Jonckheere J, Garabedian C. Heart rate markers for prediction of fetal acidosis in an experimental study on fetal sheep. Sci Rep 2022; 12:10615. [PMID: 35739219 PMCID: PMC9226053 DOI: 10.1038/s41598-022-14727-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Accepted: 06/10/2022] [Indexed: 11/09/2022] Open
Abstract
To overcome the difficulties in interpreting fetal heart rate (FHR), several tools based on the autonomic nervous system and heart rate variability (HRV) have been developed. The objective of this study was to use FHR and HRV parameters for the prediction of fetal hypoxia. It was an experimental study in the instrumented fetal sheep. Repeated umbilical cord occlusions were performed to achieve severe acidosis. Hemodynamic parameters, ECG, and blood gases were analyzed. The variables used were heart rate baseline, HRV analysis (RMSSD, SDNN, LF, HF, HFnu, Fetal Stress Index (FSI), …), and morphological analysis of decelerations. The gold standard used to classify hypoxia was the fetal arterial pH (pH < 7.10). Different multivariable statistical methods (logistic regression and decision trees) were applied for the detection of acidosis. 21 lambs were instrumented. A total of 130 pairs of FHR/fetal pH analysis were obtained of which 29 in the acidosis group and 101 in the non-acidosis group. After logistic regression model with bootstrap resampling and stepwise backward selection, only one variable was selected, FSI. The AUC of FSI alone in this model was 0.81 with a sensitivity of 0.66, specificity of 0.88, PPV of 0.61, and NPV of 0.90 considering a threshold of 68. Decision trees with CHAID and CART algorithms showed a sensitivity of 0.48 and 0.59, respectively, and a specificity of 0.94 for both. All employed methods identified HRV variables as the most predictive of acidosis. The primary variables selected automatically were those from the HRV. Supporting the use of FHRV measures for the screening of fetal acidosis during labour is interesting.
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Affiliation(s)
- Louise Ghesquière
- Univ. Lille, CHU Lille, ULR 2694-METRICS-Evaluation des technologies de santé et des pratiques médicales, 59000, Lille, France.
- Department of Obstetrics, CHU Lille, 59000, Lille, France.
- Department of Obstetrics, CHU Lille, Avenue Eugène Avinée, 59037, Lille Cedex, France.
| | - C Ternynck
- Univ. Lille, CHU Lille, ULR 2694-METRICS-Evaluation des technologies de santé et des pratiques médicales, 59000, Lille, France
- Department of Biostatistics, CHU Lille, 59000, Lille, France
| | - D Sharma
- Univ. Lille, CHU Lille, ULR 2694-METRICS-Evaluation des technologies de santé et des pratiques médicales, 59000, Lille, France
- Department of Pediatric Surgery, CHU Lille, 59000, Lille, France
| | - Y Hamoud
- Univ. Lille, CHU Lille, ULR 2694-METRICS-Evaluation des technologies de santé et des pratiques médicales, 59000, Lille, France
- Department of Obstetrics, CHU Lille, 59000, Lille, France
| | - R Vanspranghels
- Univ. Lille, CHU Lille, ULR 2694-METRICS-Evaluation des technologies de santé et des pratiques médicales, 59000, Lille, France
- Department of Obstetrics, CHU Lille, 59000, Lille, France
| | - L Storme
- Univ. Lille, CHU Lille, ULR 2694-METRICS-Evaluation des technologies de santé et des pratiques médicales, 59000, Lille, France
- Department of Neonatology, CHU Lille, 59000, Lille, France
| | - V Houfflin-Debarge
- Univ. Lille, CHU Lille, ULR 2694-METRICS-Evaluation des technologies de santé et des pratiques médicales, 59000, Lille, France
- Department of Obstetrics, CHU Lille, 59000, Lille, France
| | - J De Jonckheere
- Univ. Lille, CHU Lille, ULR 2694-METRICS-Evaluation des technologies de santé et des pratiques médicales, 59000, Lille, France
- CHU Lille, CIC-IT 1403, 59000, Lille, France
| | - C Garabedian
- Univ. Lille, CHU Lille, ULR 2694-METRICS-Evaluation des technologies de santé et des pratiques médicales, 59000, Lille, France
- Department of Obstetrics, CHU Lille, 59000, Lille, France
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6
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Hamoud Y, Pekar JD, Drumez E, Lacan L, Maboudou P, De Jonckheere J, Storme L, Houfflin-Debarge V, Sharma D, Garabedian C, Ghesquière L. Changes in S100B and troponin levels in a fetal sheep model of worsening acidosis. Eur J Obstet Gynecol Reprod Biol 2021; 264:173-177. [PMID: 34304026 DOI: 10.1016/j.ejogrb.2021.06.042] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2021] [Revised: 06/20/2021] [Accepted: 06/24/2021] [Indexed: 11/16/2022]
Abstract
BACKGROUND S100B and cardiac troponin T (c-TnT) are relevant biomarkers at birth of hypoxic-ischemic encephalopathy (HIE) and myocardial ischemia secondary to metabolic acidosis during labor, respectively. The purpose was to assess in-utero changes in S100B and c-TnT levels in an experimental model of labor-like acidosis. METHODS Repeated umbilical cord occlusions (UCOs) in ten experiments were performed in mild (phase A, 1 UCO/5 mn), moderate (phase B, 1 UCO/3 mn), and severe (phase C, 1 UCO/2 mn) period. The experiments were stopped if arterial pH reached 6.90. RESULTS UCOs resulted in fetal acidosis with pH dropping to 6.99 ±0.13. When compared to the baseline period fetal S100B increased between phases A and B (7% ± 4 vs 17% ± 13, p = 0.030) and between phases A and C (7% ± 4 vs 24% ± 8, p < 0.001). Fetal c-TnT serum levels increased during occlusions: 102 ng/L (58-119) in phase A, vs 119 ng/L (103-198) in phase B vs 169 ng / L (128-268) in phase C (p < 0.05, for all). When compared to the baseline control period, fetal ΔcTnT was significantly modified throughout UCO series: 5.0% (-3; 45) in phase A, 51% (4; 263) in phase B, and 77% (56.5; 269) in phase C (p < 0.05 for all). CONCLUSIONS S100B and c-TnT increased when fetal acidosis occurred, which reflects the potential neurological damage and fetal cardiovascular adaptation.
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Affiliation(s)
- Yasmine Hamoud
- CHU Lille, Department of Obstetrics, F-59000 Lille, France.
| | - Jean David Pekar
- CHU Lille, Automated Biochemistry (UF 8832), F-59000 Lille, France
| | - Elodie Drumez
- University of Lille, CHU Lille, EA 2694 - Public Health Epidemiology and Quality of Care, F-59000 Lille, France
| | - Laure Lacan
- CHU Lille, Department of Neuropediatrics, F-59000 Lille, France
| | - Patrice Maboudou
- CHU Lille, Automated Biochemistry (UF 8832), F-59000 Lille, France
| | | | - Laurent Storme
- CHU Lille, Department of Neonatology, F-59000 Lille, France
| | | | - Dyuti Sharma
- CHU Lille, Department of Pediatric Surgery, F-59000 Lille, France
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Recher M, Garabedian C, Aubry E, Sharma D, Butruille L, Storme L, De Jonckheere J. Opioid effect on the autonomic nervous system in a fetal sheep model. Arch Gynecol Obstet 2021; 304:73-80. [PMID: 33389095 DOI: 10.1007/s00404-020-05917-4] [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: 05/05/2020] [Accepted: 11/21/2020] [Indexed: 10/22/2022]
Abstract
PURPOSE Opioid use during labour can interfere with cardiotocography patterns. Heart rate variability indirectly reflects a fluctuation in the autonomic nervous system and can be monitored through time and spectral analyses. This experimental study aimed to evaluate the impact of nalbuphine administration on the gasometric, cardiovascular, and autonomic nervous system responses in fetal sheep. METHODS This was an experimental study on chronically instrumented sheep fetuses (surgery at 128 ± 2 days of gestational age, term = 145 days). The model was based on a maternal intravenous bolus injection of nalbuphine, a semisynthetic opioid used as an analgesic during delivery. Fetal gasometric parameters (pH, pO2, pCO2, and lactates), hemodynamic parameters (fetal heart rate and mean arterial pressure), and autonomic nervous system tone (short-term and long-term variation, low-frequency domain, high-frequency domain, and fetal stress index) were recorded. Data obtained at 30-60 min after nalbuphine injection were compared to those recorded at baseline. RESULTS Eleven experiments were performed. Fetal heart rate, mean arterial pressure, and activities at low and high frequencies were stable after injection. Short-term variation decreased at T30 min (P = 0.02), and long-term variation decreased at T60 min (P = 0.02). Fetal stress index gradually increased and reached significance at T60 min (P = 0.02). Fetal gasometric parameters and lactate levels remained stable. CONCLUSION Maternal nalbuphine use during labour may lead to fetal heart changes that are caused by the effect of opioid on the autonomic nervous system; these fluctuations do not reflect acidosis.
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Affiliation(s)
- Morgan Recher
- ULR 2694, METRICS, Evaluation des Technologies de Santé et des Pratiques Médicales, University of Lille, 59000, Lille, France. .,Department of Paediatric Intensive Care Unit, CHU Lille, Jeanne de Flandre Hospital, 59000, Lille, France. .,Jeanne de Flandre Hospital, University of Lille Nord de France, 1 rue Eugène Avinée, 59037, Lille Cedex, France.
| | - Charles Garabedian
- ULR 2694, METRICS, Evaluation des Technologies de Santé et des Pratiques Médicales, University of Lille, 59000, Lille, France.,Department of Obstetrics, CHU Lille, Jeanne de Flandre Hospital, 59000, Lille, France
| | - Estelle Aubry
- ULR 2694, METRICS, Evaluation des Technologies de Santé et des Pratiques Médicales, University of Lille, 59000, Lille, France.,Department of Pediatric Surgery, CHU Lille, Jeanne de Flandre Hospital, 59000, Lille, France
| | - Dyuti Sharma
- ULR 2694, METRICS, Evaluation des Technologies de Santé et des Pratiques Médicales, University of Lille, 59000, Lille, France.,Department of Pediatric Surgery, CHU Lille, Jeanne de Flandre Hospital, 59000, Lille, France
| | - Laura Butruille
- ULR 2694, METRICS, Evaluation des Technologies de Santé et des Pratiques Médicales, University of Lille, 59000, Lille, France
| | - Laurent Storme
- ULR 2694, METRICS, Evaluation des Technologies de Santé et des Pratiques Médicales, University of Lille, 59000, Lille, France.,Department of Neonatology, CHU Lille, Jeanne de Flandre Hospital, 59000, Lille, France
| | - Julien De Jonckheere
- ULR 2694, METRICS, Evaluation des Technologies de Santé et des Pratiques Médicales, University of Lille, 59000, Lille, France.,CIC-IT 1403-biosensor and e-health, CHU Lille, 59000, Lille, France
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8
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Lacan L, Hamoud Y, Nguyen S, De Jonckheere J, Storme L, Houfflin-Debarge V, Auvin S, Sharma D, Garabedian C, Ghesquière L. Fetal sheep cerebral electrical activity: A new technique to record EEG. J Neurosci Methods 2020; 345:108888. [PMID: 32755616 DOI: 10.1016/j.jneumeth.2020.108888] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2020] [Revised: 07/21/2020] [Accepted: 07/27/2020] [Indexed: 11/30/2022]
Abstract
BACKGROUND Sheep models are commonly used to study fetal cortical activity, including response to hypoxia. The standard technique consists of recording electrocorticogram (ECOG) in utero using electrodes placed on the dura mater. NEW METHOD We propose a new method for recording the electroencephalogram (EEG) of fetal sheep, using electrodes placed above the skull bone and fixed to the cranial periosteum. RESULTS Twelve animals were instrumented with this new technique. The EEG signal recorded in utero was of sufficient quality for visual and quantitative analysis of the fetal cortical activity. COMPARISON WITH EXISTING METHOD This new method is less invasive than the standard method commonly used to record cerebral activity in fetal sheep, because it avoids drilling the skull by hand. The EEG signal recorded in utero had visual and quantitative characteristics comparable to ECOG. CONCLUSIONS We present a new method of EEG recording that appears to be an acceptable alternative to the standard ECOG recording method. Fetal sheep EEG can be used to better understand the physiological mechanisms involved in the cerebral response to hypoxia.
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Affiliation(s)
- Laure Lacan
- Univ. Lille, CHU Lille, ULR 2694 - METRICS, F-59000, Lille, France; CHU Lille, Department of Pediatric Neurology, F-59000, Lille, France.
| | - Yasmine Hamoud
- Univ. Lille, CHU Lille, ULR 2694 - METRICS, F-59000, Lille, France; CHU Lille, Department of Obstetrics, F-59000, Lille, France
| | - Sylvie Nguyen
- Univ. Lille, CHU Lille, ULR 2694 - METRICS, F-59000, Lille, France; CHU Lille, Department of Pediatric Neurology, F-59000, Lille, France
| | - Julien De Jonckheere
- Univ. Lille, CHU Lille, ULR 2694 - METRICS, F-59000, Lille, France; CHU Lille, CIC-IT 1403, F-59000, Lille, France
| | - Laurent Storme
- Univ. Lille, CHU Lille, ULR 2694 - METRICS, F-59000, Lille, France; CHU Lille, Department of Neonatology, F-59000, Lille, France
| | - Véronique Houfflin-Debarge
- Univ. Lille, CHU Lille, ULR 2694 - METRICS, F-59000, Lille, France; CHU Lille, Department of Obstetrics, F-59000, Lille, France
| | - Stéphane Auvin
- APHP, Hôpital Robert Debré, Deparment of Pediatric Neurology, F-75019, Paris, France
| | - Dyuti Sharma
- Univ. Lille, CHU Lille, ULR 2694 - METRICS, F-59000, Lille, France; CHU Lille, Department of Pediatric Surgery, F-59000, Lille, France
| | - Charles Garabedian
- Univ. Lille, CHU Lille, ULR 2694 - METRICS, F-59000, Lille, France; CHU Lille, Department of Obstetrics, F-59000, Lille, France
| | - Louise Ghesquière
- Univ. Lille, CHU Lille, ULR 2694 - METRICS, F-59000, Lille, France; CHU Lille, Department of Obstetrics, F-59000, Lille, France
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Jonckheere JD, Garabedian C, Charlier P, Storme L, Debarge V, Logier R. Influence of averaged fetal heart rate in heart rate variability analysis. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2020; 2019:5979-5982. [PMID: 31947209 DOI: 10.1109/embc.2019.8856803] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
In high-income countries, fetal hypoxia affects 3 to 8 newborns per 1000 live births with subsequent moderate or severe Hypoxic-Ischemic Encephalopathy (HIE) in 0.5 to 1 per 1000 live births. Visual interpretation of FHR signal issued from a Doppler ultrasound cardiotocography is the gold standard to monitor fetal condition. Unfortunately, its analysis presents a high rate of inter-observer variability and a low specificity to predict poor neonatal outcomes. Under hypoxia, the fetus develops several adaptive mechanisms regulated by the autonomic nervous system inducing changes in the fetal heart rate variability. Though fetal heart rate variability methods demonstrated abilities to predict perinatal asphyxia, most of the Doppler ultrasound technologies used in clinical practice do not provide sufficiently accurate fetal heart rate signals for heart rate variability analysis. Indeed, Doppler ultrasound cardiotocography usually provides fetal heart rate values averaged over 2 or 3 beats which can constitute a limitation for spectral analysis. We developed a fetal heart rate variability analysis method: the Fetal Stress Index (FSI). The objective of this study was to investigate the influence of averaged fetal heart rate on this new index in order to check the feasibility of computing the FSI from the signal issued from Doppler ultrasound cardiotocography.
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Fetal heart rate variability analysis for neonatal acidosis prediction. J Clin Monit Comput 2020; 35:771-777. [PMID: 32451749 DOI: 10.1007/s10877-020-00535-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Accepted: 05/19/2020] [Indexed: 11/27/2022]
Abstract
Fetal well-being during labor is usually assessed by visual analysis of a fetal heart rate (FHR) tracing. Our primary objective was to evaluate the ability of automated heart rate variability (HRV) analysis methods, including our new fetal stress index (FSI), to predict neonatal acidosis. 552 intrapartum recordings were analyzed. The analysis occurred in the last 90 min before birth and was conducted during two 5-min intervals: (i) a stable period of FHR and (ii) the period corresponding to the maximum FSI value. For each period, we computed the mean FHR, FSI, short-term variability (STV), and long-term variability (LTV). Visual FHR interpretation was performed using the FIGO classification. The population was separated into two groups: (i) an acidotic group with an arterial pH at birth ≤ 7.10 and a control group. Prediction of a neonatal pH ≤ 7.10 was assessed by computing the receiver-operating characteristic area under the curve (AUC). FHR, FSI, STV, and LTV did not differ significantly between groups during the stable period. During the FSI max peak period, LTV and STV correlated significantly in the acidotic group (- 5.85 ± 2.19, p = 0.010 and - 0.62 ± 0.29, p = 0.037, respectively). The AUC values were 0.569 for FIGO classification, 0.595 for STV, and 0.622 for LTV. The multivariate model (FIGO, FSI, FC, STV, LTV) had the greatest accuracy for predicting acidosis (AUC = 0.719). FSI was not predictive of neonatal acidosis probably because of the low quality of the FHR signal in cardiotocography. When used separately, HRV indexes and visual FHR analysis were poor predictors of neonatal acidosis. Including all indexes in a multivariate model increased the predictive ability.
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Autonomic response to fetal acidosis using an experimental sheep model. Eur J Obstet Gynecol Reprod Biol 2020; 246:151-155. [PMID: 32028142 DOI: 10.1016/j.ejogrb.2020.01.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2019] [Revised: 01/11/2020] [Accepted: 01/15/2020] [Indexed: 01/20/2023]
Abstract
BACKGROUND The autonomic nervous system has a major role in fetal adaptation to hypoxia. Its activity might be assessed using heart rate variability and heart rate deceleration analyses. OBJECTIVE To evaluate the ability of different heart rate variability and morphological deceleration analyses to predict fetal acidosis during labor in an experimental fetal sheep model. STUDY DESIGN Repeated 1-minute total umbilical cord occlusions were performed at mild (1minute every 5 min), moderate (1 min every 3 min), and severe (1 min every 2 min) umbilical cord occlusion periodicities until arterial pH reached 7.10. Hemodynamic,blood gas analysis, morphological analysis of decelerations (magnitude, slope, and area ofdecelerations), and heart rate variability parameters were recorded throughout the experiment.Heart rate variability analysis included temporal analysis (root mean square of successivedifferences between adjacent RR intervals, standard deviation of normal to normal RR intervals, short term variability), spectral analysis (low frequencies, high frequencies,normalized high frequencies), and a new index developed by our team, the Fetal Stress Index.We defined and compared three pH groups: >7.20, 7.10-7.20, and <7.10. RESULTS Eleven experiments were performed. Repetitive umbilical cord occlusions resulted in progressive fetal acidosis. Fetal Stress Index was correlated with pH and lactate (p < 0.05) and increased with acidosis. There were no significant correlations between pH, lactate, and other indices (spectral analysis, temporal analysis, or morphological analysis of decelerations). CONCLUSION This protocol allowed us to identify the progressive onset of fetal acidosis in an experimental model close to labor. Fetal Stress Index is a heart rate variability method that varies with acidosis and indicates an increase in parasympathetic nervous system activity in response to fetal acidosis.
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Ghesquière L, De Jonckheere J, Drumez E, Sharma D, Aubry E, Deruelle P, Storme L, Houfflin-Debarge V, Garabedian C. Parasympathetic nervous system response to acidosis: Evaluation in an experimental fetal sheep model. Acta Obstet Gynecol Scand 2019; 98:433-439. [PMID: 30566227 DOI: 10.1111/aogs.13515] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2018] [Accepted: 12/04/2018] [Indexed: 11/29/2022]
Abstract
INTRODUCTION Heart rate variability and fetal heart rate decelerations are impacted by parasympathetic function and reflect acid-base status. Our team developed a new heart rate variability index, the fetal stress index (FSI), which has lower interindividual variability and higher sensitivity for detecting fluctuations in parasympathetic nervous system activity. The aim of this study was to explore the ability of the FSI to predict fetal acidosis in a fetal sheep model. MATERIAL AND METHODS Repeated 1-minute total umbilical cord occlusions (UCOs) were performed every 2.5 minutes over 3 hours to generate fetal acidosis mimicking that which occurs during labor and contractions. Fetal hemodynamic parameters, blood gas, the FSI and the magnitude (from the beginning to the nadir) of the fetal heart rate deceleration were recorded at regular intervals. The data were analyzed over three time intervals because of variation in the duration of the experiments: period A (first 12 UCOs), period B (middle 12 UCOs) and period C (last 12 UCOs). RESULTS Nine experiments were performed. Acidosis was progressive with a significant difference between the pH, lactate levels and base deficit values for the three periods of occlusion (P < 0.05). Both FSI and the magnitude of fetal heart rate decelerations gradually increased during the UCOs and both differed significantly between periods A and C (P = 0.0008 for FSI and P = 0.003 for deceleration). CONCLUSION This experimental protocol allowed the development of progressive acidosis in a good model of the physiology of labor. Parasympathetic nervous system activity increased during acidosis and could be measured using our index, the FSI, and the magnitude of fetal heart rate decelerations.
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Affiliation(s)
- Louise Ghesquière
- EA 4489 - Perinatal Environment and Health, University of Lille, Lille, France.,Department of Obstetrics, University Hospital Center (CHU) Lille, Lille, France
| | - Julien De Jonckheere
- EA 4489 - Perinatal Environment and Health, University of Lille, Lille, France.,Clinical Investigation Center - Technological Innovation (CIC-IT) 1403, University Hospital Center (CHU) Lille, Lille, France
| | - Elodie Drumez
- EA 2694 - Public Health: Epidemiology and Quality of Care, Department of Biostatistics, University of Lille, University Hospital Center (CHU) Lille, Lille, France
| | - Dyuti Sharma
- EA 4489 - Perinatal Environment and Health, University of Lille, Lille, France.,Department of Pediatric Surgery, University Hospital Center (CHU) Lille, Lille, France
| | - Estelle Aubry
- EA 4489 - Perinatal Environment and Health, University of Lille, Lille, France.,Department of Pediatric Surgery, University Hospital Center (CHU) Lille, Lille, France
| | - Philippe Deruelle
- EA 4489 - Perinatal Environment and Health, University of Lille, Lille, France.,Department of Obstetrics, University Hospital Center (CHU) Lille, Lille, France
| | - Laurent Storme
- EA 4489 - Perinatal Environment and Health, University of Lille, Lille, France.,Department of Neonatology, University Hospital Center (CHU) Lille, Lille, France
| | - Véronique Houfflin-Debarge
- EA 4489 - Perinatal Environment and Health, University of Lille, Lille, France.,Department of Obstetrics, University Hospital Center (CHU) Lille, Lille, France
| | - Charles Garabedian
- EA 4489 - Perinatal Environment and Health, University of Lille, Lille, France.,Department of Obstetrics, University Hospital Center (CHU) Lille, Lille, France
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Garabedian C, Aubry E, Sharma D, Bleu G, Clermont-Hama Y, Ghesquière L, Hubert T, Deruelle P, Storme L, De Jonckheere J, Houfflin-Debarge V. Exploring fetal response to acidosis in ewes: Choosing an adequate experimental model. J Gynecol Obstet Hum Reprod 2018; 47:397-403. [PMID: 29654942 DOI: 10.1016/j.jogoh.2018.04.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2018] [Accepted: 04/10/2018] [Indexed: 01/02/2023]
Abstract
INTRODUCTION Knowledge of fetal physiology during labor has been largely generated from animal models. Our team recently developed a new index to assess parasympathetic activity using different experimental protocols to obtain acidosis. The objective of the present study was to discuss the different protocols and to review other models proposed in the literature. MATERIAL AND METHODS Pregnant ewes underwent a surgical procedure at the 123±2 days gestational age (term=145 days). Three experimental protocols were used: protocol A consisted of 25%, 50% and 75% umbilical cord occlusion (UCO) for 20min. Protocol B consisted of partial 75% UCO until reaching a pH<7.10. Protocol C consisted of brief, repetitive complete occlusion until severe acidosis occurred. Hemodynamic and blood gas parameters were compared to those of the stability period before UCO. RESULTS Protocol A led to a progressive response depending on the degree of occlusion (decrease in fetal heart rate, arterial hypertension and pH). Protocol B led to severe acidosis, although the duration of UCO varied per animal. Protocol C also progressively led to acidosis. We observed high inter individual variability in the acidosis response. CONCLUSION Pregnant ewes are a relevant model for exploring fetal response to acidosis. The frequency of UCO and partial or complete occlusion should be adapted to the expected effects. Knowledge of these protocols is important to respect ethical guidelines and to reduce the required number of animals. Moreover, it is important to consider the high individual variability of the acidosis response in the interpretation of the results.
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Affiliation(s)
- C Garabedian
- University Lille, EA 4489 - Perinatal Environment and Health, F-59000 Lille, France; CHU Lille, Department of Obstetrics, F-59000 Lille, France.
| | - E Aubry
- University Lille, EA 4489 - Perinatal Environment and Health, F-59000 Lille, France; CHU Lille, Department of Pediatric Surgery, F-59000 Lille, France
| | - D Sharma
- University Lille, EA 4489 - Perinatal Environment and Health, F-59000 Lille, France; CHU Lille, Department of Pediatric Surgery, F-59000 Lille, France
| | - G Bleu
- University Lille, EA 4489 - Perinatal Environment and Health, F-59000 Lille, France; CHU Lille, Department of Obstetrics, F-59000 Lille, France
| | - Y Clermont-Hama
- University Lille, EA 4489 - Perinatal Environment and Health, F-59000 Lille, France; CHU Lille, Department of Obstetrics, F-59000 Lille, France
| | - L Ghesquière
- University Lille, EA 4489 - Perinatal Environment and Health, F-59000 Lille, France; CHU Lille, Department of Obstetrics, F-59000 Lille, France
| | - T Hubert
- University Lille, CHU Lille, Experimental Resources Platform, F-59000 Lille, France
| | - P Deruelle
- University Lille, EA 4489 - Perinatal Environment and Health, F-59000 Lille, France; CHU Lille, Department of Obstetrics, F-59000 Lille, France
| | - L Storme
- University Lille, EA 4489 - Perinatal Environment and Health, F-59000 Lille, France; CHU Lille, Department of Neonatology, F-59000 Lille, France
| | - J De Jonckheere
- University Lille, EA 4489 - Perinatal Environment and Health, F-59000 Lille, France; CHU Lille, CIC-IT 1403, MRRC, F-59000 Lille, France
| | - V Houfflin-Debarge
- University Lille, EA 4489 - Perinatal Environment and Health, F-59000 Lille, France; CHU Lille, Department of Obstetrics, F-59000 Lille, France
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