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Lembo C, El-Khuffash A, Fusch C, Iacobelli S, Lapillonne A. Nutrition of the preterm infant with persistent ductus arteriosus: existing evidence and practical implications. Pediatr Res 2023:10.1038/s41390-023-02754-4. [PMID: 37563451 DOI: 10.1038/s41390-023-02754-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Revised: 07/01/2023] [Accepted: 07/09/2023] [Indexed: 08/12/2023]
Abstract
The persistence of a patent ductus arteriosus (PDA) is a common condition in preterm infants with a prevalence inversely proportional to gestational age. PDA is associated with mild-to-severe gastrointestinal complications such as feeding intolerance, gastrointestinal perforation, and necrotizing enterocolitis, which represent a major challenge for the nutritional management in preterm infants. In this context, the Section on Nutrition, Gastroenterology and Metabolism and the Circulation Section of the European Society for Pediatric Research have joined forces to review the current knowledge on nutritional issues related to PDA in preterm infants. The aim of the narrative review is to discuss the clinical implications for nutritional practice. Because there is little literature on postnatal nutrition and PDA in preterm infants, further research with well-designed studies on this topic is urgently needed. Guidelines should also be developed to clearly define the implementation and course of enteral nutrition and the target nutritional intake before, during, and after pharmacologic or surgical treatment of PDA, when indicated. IMPACT: Persistent ductus arteriosus (PDA) is associated with gastrointestinal complications such as feeding intolerance, gastrointestinal perforation, and necrotizing enterocolitis, which pose a major challenge to the nutritional management of preterm infants. In PDA infants, fluid restriction may lead to inadequate nutrient intake, which may negatively affect postnatal growth and long-term health. The presence of PDA does not appear to significantly affect mesenteric blood flow and splanchnic oxygenation after enteral feedings. Initiation or maintenance of enteral nutrition can be recommended in infants with PDA.
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Affiliation(s)
- Chiara Lembo
- Department of Neonatology, APHP, Necker-Enfants Malades Hospital, Paris, France
| | - Afif El-Khuffash
- Department of Pediatrics (School of Medicine), Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Christoph Fusch
- Neonatology, Department of Pediatrics, General Hospital, Paracelsus Medical School, Nuernberg, Germany
- McMaster Children's Hospital, Hamilton Health Sciences, Hamilton, ON, Canada
| | - Silvia Iacobelli
- Réanimation Néonatale et Pédiatrique, CHU La Réunion, Saint-Pierre, France
| | - Alexandre Lapillonne
- Department of Neonatology, APHP, Necker-Enfants Malades Hospital, Paris, France.
- EHU 7328 PACT, Paris Cite University, Paris, France.
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Sirota GL, Litmanovitz I, Vider C, Arnon S, Moore SS, Grinblatt E, Levkovitz O, Bauer Rusek S. Regional Splanchnic Oxygenation during Continuous versus Bolus Feeding among Stable Preterm Infants. CHILDREN 2022; 9:children9050691. [PMID: 35626866 PMCID: PMC9139727 DOI: 10.3390/children9050691] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 04/24/2022] [Accepted: 05/03/2022] [Indexed: 11/16/2022]
Abstract
Introduction: There is no agreement regarding the best method for tube-feeding preterm infants. Few studies, to date, have evaluated the influence of different methods of enteral feeding on intestinal oxygenation. The use of near-infrared spectroscopy (NIRS) has permitted the noninvasive measurement of splanchnic regional oxygenation (rSO2S) in different clinical conditions. The aim of this prospective, single-center study was to compare rSO2S during continuous versus bolus feeding among stable preterm infants. Methods: Twenty-one preterm infants, less than 32 weeks gestation and appropriate for gestational age, were enrolled. All infants were clinically stable and on full tube feedings. Each infant received a bolus feeding initially (20 min duration), and after 3 h, a continuous feeding (5 h duration). Infants were evaluated 30 min before and 30 min after the bolus and continuous feedings. The regional splanchnic saturation (rSO2S) was measured using near-infrared spectroscopy (NIRS) technology and systemic saturation was measured with pulse oximetry. From these measurements, we calculated the splanchnic fractional oxygen extraction ratio (FOES) for each of the four intervals. Results: rSO2S decreased after continuous vs. bolus feeding (p = 0.025), while there was a trend toward decreased SaO2 after bolus feeding (p = 0.055). The FOES, which reflects intestinal oxygen extraction, was not affected by the feeding mode (p = 0.129). Discussion/Conclusion: Continuous vs. bolus feeding decreases rSO2S but does not affect oxygen extraction by intestinal tissue; after bolus feeding there was a trend towards decreased systemic saturation.
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Affiliation(s)
- Gisela Laura Sirota
- Department of Neonatology, Meir Medical Center, Kfar-Saba 4428164, Israel; (I.L.); (S.A.); (S.S.M.); (E.G.); (O.L.); (S.B.R.)
- Correspondence: ; Tel.: +972-50-538-2266
| | - Ita Litmanovitz
- Department of Neonatology, Meir Medical Center, Kfar-Saba 4428164, Israel; (I.L.); (S.A.); (S.S.M.); (E.G.); (O.L.); (S.B.R.)
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Carmel Vider
- Department of Pediatrics, Meir Medical Center, Kfar-Saba 4428164, Israel;
| | - Shmuel Arnon
- Department of Neonatology, Meir Medical Center, Kfar-Saba 4428164, Israel; (I.L.); (S.A.); (S.S.M.); (E.G.); (O.L.); (S.B.R.)
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Shiran Sara Moore
- Department of Neonatology, Meir Medical Center, Kfar-Saba 4428164, Israel; (I.L.); (S.A.); (S.S.M.); (E.G.); (O.L.); (S.B.R.)
| | - Eynit Grinblatt
- Department of Neonatology, Meir Medical Center, Kfar-Saba 4428164, Israel; (I.L.); (S.A.); (S.S.M.); (E.G.); (O.L.); (S.B.R.)
| | - Orly Levkovitz
- Department of Neonatology, Meir Medical Center, Kfar-Saba 4428164, Israel; (I.L.); (S.A.); (S.S.M.); (E.G.); (O.L.); (S.B.R.)
| | - Sofia Bauer Rusek
- Department of Neonatology, Meir Medical Center, Kfar-Saba 4428164, Israel; (I.L.); (S.A.); (S.S.M.); (E.G.); (O.L.); (S.B.R.)
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3
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Weeks CL, Marino LV, Johnson MJ. A systematic review of the definitions and prevalence of feeding intolerance in preterm infants. Clin Nutr 2021; 40:5576-5586. [PMID: 34656954 DOI: 10.1016/j.clnu.2021.09.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Revised: 08/03/2021] [Accepted: 09/07/2021] [Indexed: 12/29/2022]
Abstract
BACKGROUND & AIMS Feeding intolerance (FI) is a common phenomenon experienced in preterm infants in neonatal intensive care units, as well as being a focus of many research studies into feeding methods, particularly in relation to comorbidities. There is no widely accepted definition of FI. This systematic review aimed to explore the range of definitions used for FI and provide an estimate of the prevalence amongst preterm infants. METHODS Searches were completed on MEDLINE (includes the Cochrane library), Embase, PsycInfo, CINAHL, NHS Evidence and Web of Science. Inclusion criteria; preterm infants in neonatal units, a clear definition of FI, >10 patients and be available in English language. Case reports were excluded. RESULTS One hundred studies were included. Definitions of FI were inconsistent. Studies were grouped according to definition used into: Group A - measuring gastric residual volume (GRV) only; group B - GRV and abdominal distension (AD); group C - GRV, AD and gastrointestinal symptoms (GI) which included any of vomiting, bilious vomiting and blood in stool; group D- GRV and GI; group E - AD and GI; group F - GI only and group G - any other elements used. Meta-analysis demonstrated that prevalence of FI between groups varied from 15 to 30% with an overall prevalence of 27% (95% confidence interval 23-31%). Group A had the highest prevalence. Review of time to full enteral feed was performed (37 studies) which demonstrated a range of 11.3-18.3 days depending on which FI definition used. DISCUSSION Definitions of FI in research are inconsistent, a similar finding to that seen in studies in both paediatric and adult critical care populations. The difficulty of defining FI in the preterm population is the concern regarding necrotising enterocolitis, with some studies using an overlap in their definitions, despite differing pathophysiology and management. Due to the heterogeneity of data obtained in this review regarding definitions used, further robust research is required in order to conclude which elements which should be used to define FI in this population. PROSPERO NUMBER CRD42019155596. Registered November 2019.
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Affiliation(s)
- Charlotte L Weeks
- Paediatric Intensive Care Unit, University Hospital Southampton NHS Foundation Trust and University of Southampton, Southampton, UK.
| | - Luise V Marino
- Department of Dietetics/SLT, University Hospital Southampton NHS Foundation Trust, Southampton, UK; NIHR Biomedical Research Centre Southampton, University Hospital Southampton NHS Foundation Trust and University of Southampton, Southampton, UK
| | - Mark J Johnson
- NIHR Biomedical Research Centre Southampton, University Hospital Southampton NHS Foundation Trust and University of Southampton, Southampton, UK; Department of Neonatal Medicine, University Hospital Southampton NHS Foundation Trust and University of Southampton, Southampton, UK
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4
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Abstract
OBJECTIVE The aim of this study is to assess the effects of administering 20 mg/kg loading dose of caffeine citrate intravenously on splanchnic oxygenation in preterm infants. STUDY DESIGN The infants with a gestational age (GA) of <34 weeks who were administered with a 20 mg/kg intravenous loading dose of caffeine citrate within 48 hours after birth were investigated prospectively. Regional splanchnic oxygen saturation (rsSO2) and splanchnic fractional tissue oxygen extraction rate (sFTOE) were measured using near-infrared spectroscopy before caffeine infusion, immediately after caffeine infusion and 1, 2, 3, 4, and 6 hours (h) after dose completion; postdose values were compared with predose values. RESULTS A total of 41 infants with a mean GA of 29.2 ± 1.6 weeks and birth weight of 1,315 ± 257 g as well as postnatal age of 32.2 ± 10.8 hours were included in the study. rsSO2 significantly reduced from 63.1 to 57.5% immediately after caffeine infusion, 55.1% after 1 hour, and 55.2% after 2 hours with partial recovery at 3-hour postdose. sFTOE increased correspondingly. CONCLUSION Caffeine reduces splanchnic oxygenation and increases splanchnic oxygen extraction for at least 2 hours with partial recovery to predose levels at 3-hour postdose.
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Affiliation(s)
- Ozkan Ilhan
- Department of Neonatology, Harran University School of Medicine, Sanliurfa, Turkey
| | - Meltem Bor
- Department of Neonatology, Harran University School of Medicine, Sanliurfa, Turkey
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Parenteral Nutrition and Oxidant Load in Neonates. Nutrients 2021; 13:nu13082631. [PMID: 34444799 PMCID: PMC8401055 DOI: 10.3390/nu13082631] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Revised: 07/19/2021] [Accepted: 07/27/2021] [Indexed: 01/05/2023] Open
Abstract
Neonates with preterm, gastrointestinal dysfunction and very low birth weights are often intolerant to oral feeding. In such infants, the provision of nutrients via parenteral nutrition (PN) becomes necessary for short-term survival, as well as long-term health. However, the elemental nutrients in PN can be a major source of oxidants due to interactions between nutrients, imbalances of anti- and pro-oxidants, and environmental conditions. Moreover, neonates fed PN are at greater risk of oxidative stress, not only from dietary sources, but also because of immature antioxidant defences. Various interventions can lower the oxidant load in PN, including the supplementation of PN with antioxidant vitamins, glutathione, additional arginine and additional cysteine; reduced levels of pro-oxidant nutrients such as iron; protection from light and oxygen; and proper storage temperature. This narrative review of published data provides insight to oxidant molecules generated in PN, nutrient sources of oxidants, and measures to minimize oxidant levels.
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Koike Y, Li B, Chen Y, Ganji N, Alganabi M, Miyake H, Lee C, Hock A, Wu R, Uchida K, Inoue M, Delgado-Olguin P, Pierro A. Live Intravital Intestine with Blood Flow Visualization in Neonatal Mice Using Two-photon Laser Scanning Microscopy. Bio Protoc 2021; 11:e3937. [PMID: 33796611 DOI: 10.21769/bioprotoc.3937] [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: 08/27/2020] [Revised: 01/12/2021] [Accepted: 01/13/2021] [Indexed: 11/02/2022] Open
Abstract
This protocol describes a novel technique to investigate the microcirculation dynamics underlying the pathology in the small intestine of neonatal mice using two-photon laser-scanning microscopy (TPLSM). Recent technological advances in multi-photon microscopy allow intravital analysis of different organs such as the liver, brain and intestine. Despite these advances, live visualization and analysis of the small intestine in neonatal rodents remain technically challenging. We herein provide a detailed description of a novel method to capture high resolution and stable images of the small intestine in neonatal mice as early as postnatal day 0. This imaging technique allows a comprehensive understanding of the development and blood flow dynamics in small intestine microcirculation.
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Affiliation(s)
- Yuhki Koike
- Division of General and Thoracic Surgery, Physiology and Experimental Medicine Program, The Hospital for Sick Children, Toronto, ON, Canada.,Department of Gastrointestinal and Pediatric Surgery, Mie University Graduate School of Medicine, Tsu, Mie, Japan
| | - Bo Li
- Division of General and Thoracic Surgery, Physiology and Experimental Medicine Program, The Hospital for Sick Children, Toronto, ON, Canada
| | - Yong Chen
- Division of General and Thoracic Surgery, Physiology and Experimental Medicine Program, The Hospital for Sick Children, Toronto, ON, Canada
| | - Niloofar Ganji
- Division of General and Thoracic Surgery, Physiology and Experimental Medicine Program, The Hospital for Sick Children, Toronto, ON, Canada
| | - Mashriq Alganabi
- Division of General and Thoracic Surgery, Physiology and Experimental Medicine Program, The Hospital for Sick Children, Toronto, ON, Canada
| | - Hiromu Miyake
- Division of General and Thoracic Surgery, Physiology and Experimental Medicine Program, The Hospital for Sick Children, Toronto, ON, Canada
| | - Carol Lee
- Division of General and Thoracic Surgery, Physiology and Experimental Medicine Program, The Hospital for Sick Children, Toronto, ON, Canada
| | - Alison Hock
- Division of General and Thoracic Surgery, Physiology and Experimental Medicine Program, The Hospital for Sick Children, Toronto, ON, Canada
| | - Richard Wu
- Division of Gastroenterology, Hepatology and Nutrition, The Hospital for Sick Children, Toronto, ON, Canada
| | - Keiichi Uchida
- Department of Gastrointestinal and Pediatric Surgery, Mie University Graduate School of Medicine, Tsu, Mie, Japan
| | - Mikihiro Inoue
- Department of Gastrointestinal and Pediatric Surgery, Mie University Graduate School of Medicine, Tsu, Mie, Japan
| | - Paul Delgado-Olguin
- Translational Medicine, The Hospital for Sick Children, Toronto, Ontario, Canada.,Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada.,Heart & Stroke Richard Lewar Centre of Excellence, Toronto, Ontario, Canada
| | - Agostino Pierro
- Division of General and Thoracic Surgery, Physiology and Experimental Medicine Program, The Hospital for Sick Children, Toronto, ON, Canada
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Goldshtrom N, Isler JR, Sahni R. Comparing liver and lower abdomen near-infrared spectroscopy in preterm infants. Early Hum Dev 2020; 151:105194. [PMID: 33017708 DOI: 10.1016/j.earlhumdev.2020.105194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Revised: 09/10/2020] [Accepted: 09/16/2020] [Indexed: 11/16/2022]
Abstract
BACKGROUND Near-infrared spectroscopy (NIRS) is being increasingly used to investigate regional oxygenation (rSO2) and perfusion in areas such as the abdomen in preterm infants prone to feeding intolerance. Lower abdominal rSO2 values are extremely variable, high sensitivity and currently low specificity tools. The liver, a solid organ, could provide a more reliable site for splanchnic oxygenation and perfusion monitoring. AIMS Compare liver and lower abdomen rSO2 values in stable preterm infants in response to feeding. STUDY DESIGN We prospectively evaluated the correlation between rSO2 over the liver and lower abdomen in 16 preterm infants born between 28 and 32 weeks' gestational age using 48 h of continuous NIRS data. OUTCOME MEASURES Mean liver and lower abdomen rSO2 values. RESULTS The overall mean liver rSO2 were higher than the overall mean lower abdomen values, 78.4 ± 7.1 vs. 65.1 ± 24.9 respectively. Time series analysis showed a mean maximum cross correlation between the liver and lower abdomen of 0.28 (SD ± 0.03; p < 0.001); the liver signal lagged the lower abdomen by an average of 5.4 s (SD ± 1.2 s, Range 0-16 s). Mixed models analysis showed that during bolus feeding, liver values increased 10 to 30 min after the start of feeding (p < 0.01) while lower abdomen increased from 20 to 60 min after the start of feeding (p < 0.05) and liver values were less variable than lower abdomen values. CONCLUSION Liver rSO2 appears to be a more stable surrogate for splanchnic oxygenation and perfusion than lower abdomen rSO2.
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Affiliation(s)
- Nimrod Goldshtrom
- Department of Pediatrics, Columbia University, 630 West 168th Street, New York, NY, 10032, USA.
| | - Joseph R Isler
- Department of Pediatrics, Columbia University, 630 West 168th Street, New York, NY, 10032, USA.
| | - Rakesh Sahni
- Department of Pediatrics, Columbia University, 630 West 168th Street, New York, NY, 10032, USA.
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Jain N, Ramji S, Jain A, Modi M, Sharma P. Early prediction of feed intolerance in very low birth weight preterm infants using superior mesenteric artery blood flow velocity. J Matern Fetal Neonatal Med 2020; 33:3916-3921. [PMID: 30888887 DOI: 10.1080/14767058.2019.1591362] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Objective: To evaluate the utility of superior mesenteric artery (SMA) flow velocity post feeding for predicting time to achieve full enteral feeds in very low birth weight (VLBW) neonates.Subjects: In this prospective cohort study preterm VLBW infants were followed until they achieved full enteral feeding.Results: There was no significant difference between prefeed and post feed SMA flow measurements in study subjects. At baseline, it was observed that Small for gestational age (SGA) babies had a significantly lower peak systolic velocity. Time-averaged mean velocity (TAMV) was significantly lower in SGA babies at baseline, 15, 30, 45, and 60 min post feed, but there were no within-group differences noted over time.Conclusion: SMA blood flow velocity measured pre-feed and post-feed times do not correlate with the time to achieve full enteral feeding in very low birth weight neonates. The clinical significance of lower Peak systolic velocity (PSV) and TAMV in SGA infants is unclear.
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Affiliation(s)
- Nidhi Jain
- Department of Neonatology, Maulana Azad Medical College, New Delhi, India
| | - Siddarth Ramji
- Department of Neonatology, Maulana Azad Medical College, New Delhi, India
| | - Ashish Jain
- Department of Neonatology, Maulana Azad Medical College, New Delhi, India
| | - Manoj Modi
- Department of Neonatology, Sir Ganga Ram Hospital, New Delhi, India
| | - Pradeep Sharma
- Department of Neonatology, SPG Apollo Hospital, Ludhiana, India
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Kim HY, Bang KS. The effects of enteral feeding improvement massage on premature infants: A randomised controlled trial. J Clin Nurs 2017; 27:92-101. [PMID: 28415135 DOI: 10.1111/jocn.13850] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/02/2017] [Indexed: 11/30/2022]
Abstract
AIMS AND OBJECTIVES To prove the effects of an enteral feeding improvement massage for premature infants with regard to their feeding, growing and superior mesentery artery blood flow aspect by a randomised controlled trial. BACKGROUND Premature infants have feeding-related problems related to eating and absorbing nutrition due to their immature gastrointestinal function. Studies regarding the effectiveness of premature infants' enteral feeding improvement by tactile stimulation massage are rare. DESIGN The study group was composed of 55 patients. Of the 55 patients, 26 were randomised into an experimental group and 29 were randomised into a control group. METHODS They were all born <34 weeks of gestational age between 1 July 2011 and 30 March 2012. Premature infants in the experimental group received enteral feeding improvement massage twice a day for 14 days, and infants in the control group received a sham exercise. The collected data were analysed by spss 19.0, through t test, chi-square test (Fisher's exact) and ANCOVA. RESULTS (i) The experimental group had reached the day of full enteral feeding significantly faster. (ii) The experimental group had a higher superior mesentery artery peak velocity (Vmax ) and lower RI (resistant index). (iii) The experimental group of the feeding-intolerant subgroup had a higher superior mesentery artery Vmax and Vmin . (iv) The experimental group had a heavier weight and larger head circumference after 14 days. CONCLUSIONS This study demonstrates that enteral feeding improvement massage can be helpful for achieving earlier full enteral feeding, more increased superior mesentery artery, and faster growing. In particular, it can be a therapeutic, independent and evidence-based nursing intervention for feeding-intolerant premature infants. RELEVANCE TO CLINICAL PRACTICE Neonatal nurses in neonatal intensive care unit can apply enteral feeding improvement massage massage for feeding-intolerant infants.
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Affiliation(s)
| | - Kyung-Sook Bang
- College of Nursing, The Research Institute of Nursing Science, Seoul National University, Seoul, Korea
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10
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Sancak S, Arman D, Gursoy T, Topcuoglu S, Karatekin G, Ovalı F. Intestinal blood flow by Doppler ultrasound: the impact of clarithromycin treatment for feeding intolerance in preterm neonates. J Matern Fetal Neonatal Med 2015; 29:1853-6. [PMID: 26135789 DOI: 10.3109/14767058.2015.1066327] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE To compare the blood flow velocities of superior mesenteric artery (SMA) before versus after clarithromycin treatment for feeding intolerance in very low-birth weight infants. METHODS A prospective study was conducted in a group of infant <1500 g with feeding intolerance who received clarithromycin 7.5 mg/kg/dose bid. Before and at the third day of the clarithromycin therapy, SMA blood flow velocity was measured with Doppler ultrasound. RESULTS SMA peak systolic velocity (PSV) and mean systolic velocity (MV) on the third day of the treatment was found significantly higher than the initial measurement (p = 0.013 and p = 0.027, respectively). End diastolic velocity of the SMA did not change with clarithromycin therapy (p = 0.113). There were no significant changes about pulsatility and resistive index of SMA with regard to clarithromycin therapy. CONCLUSION Clarithromycin effects the splanchnic circulation. The rise in PSV and MV in SMA is remarkable. These results suggest that the splanchnic blood flow increases significantly after clarithromycin usage.
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Affiliation(s)
- Selim Sancak
- a Department of Neonatal Intensive Care Unit , Zeynep Kamil Maternity and Children's Training and Research Hospital , Istanbul , Turkey
| | - Didem Arman
- a Department of Neonatal Intensive Care Unit , Zeynep Kamil Maternity and Children's Training and Research Hospital , Istanbul , Turkey
| | - Tugba Gursoy
- a Department of Neonatal Intensive Care Unit , Zeynep Kamil Maternity and Children's Training and Research Hospital , Istanbul , Turkey
| | - Sevilay Topcuoglu
- a Department of Neonatal Intensive Care Unit , Zeynep Kamil Maternity and Children's Training and Research Hospital , Istanbul , Turkey
| | - Guner Karatekin
- a Department of Neonatal Intensive Care Unit , Zeynep Kamil Maternity and Children's Training and Research Hospital , Istanbul , Turkey
| | - Fahri Ovalı
- a Department of Neonatal Intensive Care Unit , Zeynep Kamil Maternity and Children's Training and Research Hospital , Istanbul , Turkey
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Bolus vs. continuous feeding: effects on splanchnic and cerebral tissue oxygenation in healthy preterm infants. Pediatr Res 2014; 76:81-5. [PMID: 24713819 DOI: 10.1038/pr.2014.52] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/04/2013] [Accepted: 01/14/2014] [Indexed: 11/08/2022]
Abstract
BACKGROUND Intermittent and continuous tube feeding modes are commonly used to feed preterm infants. However, there is no clear evidence regarding which method is better tolerated. We investigated the differences between bolus and continuous feeding in terms of cerebral and splanchnic oxygenation in healthy preterm infants. METHODS Thirty preterm infants underwent a simultaneous 6-h near-infrared-spectroscopy monitoring of cerebral and splanchnic oxygenation, during which they were fed twice through an orogastric tube: one meal was given as a 10-min bolus, and the other was given continuously over a period of 3 h. Oxygenation trends over time were evaluated and compared between bolus and continuous feeding modes. RESULTS Cerebral oxygenation did not change over time and did not differ between the two feeding techniques. Splanchnic oxygenation changed significantly over time and differed between the two feeding techniques, with a significant increase after bolus feeding and a remarkable reduction during continuous feeding. CONCLUSION Bolus and continuous feeding modes influence splanchnic oxygenation in healthy preterm infants differently. Further studies are needed to investigate possible underlying mechanisms and potential effects on feeding tolerance.
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Abstract
We aimed to assess the current knowledge on continuous versus intermittent bolus feeding in preterm infants. We found that existing evidence does not support the firm recommendation of one strategy among the many alternatives. However, although many areas remain to be investigated, it is probable that continuous feeding might be advantageous compared to intermittent feeding in favoring the faster establishment of full enteral feeding, and decreasing the risk of hypoxic-ischemic gut damage in preterm neonates in critical condition, especially SGA infants, by limiting their gastrointestinal oxygen requirement.
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Affiliation(s)
- Carlo Dani
- Department of Surgical and Medical Critical Care, Neonatology Section, Careggi University Hospital of Florence, Viale Morgagni, 85, 50134 Florence, Italy.
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13
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Real-time bowel ultrasound to characterize intestinal motility in the preterm neonate. J Perinatol 2013; 33:605-8. [PMID: 23448942 DOI: 10.1038/jp.2013.17] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/02/2012] [Revised: 01/10/2013] [Accepted: 01/22/2013] [Indexed: 11/08/2022]
Abstract
OBJECTIVE To characterize normal patterns of intestinal motility by ultrasound (US) in the preterm neonate during the first 5 days of life. STUDY DESIGN Bowel US examinations were performed with an US machine (Vivid-i, General Electric) equipped with a 13-MHz linear and 7 MHz sector transducer. Still images and clips were taken from all abdominal quadrants along with Doppler of the superior mesenteric artery. Cumulative motility (CM) was quantified for each patient. Comparisons were made between CM for each day of life. Inter-observer correlations were made using the intra-class correlation coefficient. Notation was made of feeding status, bowel sounds and clinical demographics. RESULT Twenty infants were enrolled in the study. Seventeen infants had 5 days of complete US results available. Mean CM visualized on day of life (DOL) 1 was 28±12. By DOL 4 (38±17, P=0.006) and DOL 5 (41±20, P=0.008) mean CM increased. There was no difference in the resistance index on days imaged. Mean CM correlated with days to reach full feeds and gestational age, but gestational age was a stronger predictor of days to reach full feeds. Intra-observer correlation coefficient was 0.84. CONCLUSION Real-time US provides a quantitative measure of intestinal motility in the preterm infant. Further studies are needed to establish the link between bowel US findings and feeding tolerance.
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Near-infrared spectroscopy measurements of splanchnic tissue oxygenation during continuous versus intermittent feeding method in preterm infants. J Pediatr Gastroenterol Nutr 2013; 56:652-6. [PMID: 23343937 DOI: 10.1097/mpg.0b013e318287e9d7] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
OBJECTIVES The aim of the present study was to compare the effects of continuous and intermittent bolus milk feeding on splanchnic regional oxygenation (rSO₂S) in small-for-gestational age (SGA) and appropriate-for-gestational age (AGA) preterm infants. METHODS Infants with gestational age <32 weeks were prospectively studied by near-infrared spectroscopy. Each infant was given a milk bolus in ~10 minutes (intermittent feeding) followed after 3 hours by a 3-hour continuous feeding. rO₂S and splanchnic fractional oxygen extraction ratio (FOES [S = splanchnic]) were recorded 30 minutes before (T₀) and 30 minutes after the beginning of bolus feeding (T₁), 30 minutes before (T₂), at the end (T₃), and 30 minutes after the continuous feeding period (T₄). RESULTS rSO2S increased at T₁ in both AGA and SGA groups, whereas FOES did not vary during the study period. Moreover, we found that rSO2S was higher and FOES was lower at T₁ and T₃ in the AGA than in the SGA group. CONCLUSIONS Bolus milk feeding increases splanchnic oxygenation in both AGA and SGA infants, whereas continuous feeding does not. Splanchnic oxygenation is higher in AGA than in SGA infants both during bolus and continuous feeding. Continuous enteral feeding could help to limit the risk of hypoxic-ischemic gut damage in preterm infants in critical condition, especially in AGA infants.
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Louis D, Mukhopadhyay K, Sodhi KS, Jain V, Kumar P. Superior mesenteric artery Doppler is poor at predicting feed intolerance and NEC in preterm small for gestational age neonates. J Matern Fetal Neonatal Med 2013; 26:1855-9. [DOI: 10.3109/14767058.2013.799649] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Abstract
The neonatal gastrointestinal tract is a site of intense anabolic and metabolic activity, as it is responsible for the assimilation of nutritional intake and exhibits accelerated growth shortly after birth. The hypermetabolic state of the gastrointestinal tract requires sufficient blood flow and oxygen delivery to sustain adequate oxygen consumption to meet these metabolic needs. Therefore, an understanding of the mechanisms regulating intestinal vascular perfusion in the normal state and during pathophysiological conditions in the perinatal period is important to elucidate potential contributions to the development of intestinal pathologies in the neonate. The goal of this review is to summarize the available literature on the regulation of intestinal blood flow and oxygenation in the fetus and newborn in normal states and during pathological stress.
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Affiliation(s)
- Hala Chaaban
- Department of Pediatrics, Oklahoma University Health Sciences Center, Oklahoma City, OK, USA
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Gay AN, Lazar DA, Stoll B, Naik-Mathuria B, Mushin OP, Rodriguez MA, Burrin D, Olutoye O. Near-infrared spectroscopy measurement of abdominal tissue oxygenation is a useful indicator of intestinal blood flow and necrotizing enterocolitis in premature piglets. J Pediatr Surg 2011; 46:1034-40. [PMID: 21683194 PMCID: PMC3121185 DOI: 10.1016/j.jpedsurg.2011.03.025] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2011] [Accepted: 03/26/2011] [Indexed: 10/18/2022]
Abstract
PURPOSE A major objective of necrotizing enterocolitis (NEC) research is to devise a noninvasive method of early detection. We hypothesized that abdominal near-infrared spectroscopy (A-NIRS) readings will identify impending NEC in a large animal model. METHODS Piglets were prematurely delivered and received parenteral nutrition followed by enteral feedings. Serial A-NIRS readings were obtained for 5 days, and animals were monitored for NEC. Separately, A-NIRS readings were obtained in healthy piglets to validate the correlation of A-NIRS with splanchnic oxygen delivery. RESULTS Of 29 piglets, 3 developed NEC. Eleven piglets without NEC died prematurely. Fifteen piglets remained healthy, had normal histologic assessment of their intestines, and served as controls. Abdominal near-infrared spectroscopy readings within 12 hours of birth were significantly lower in animals that developed NEC compared with healthy littermates (4% vs 33%, P = .02). For all time-points measured, A-NIRS readings were significantly lower in the NEC group compared with controls (21% vs 55%, P < .001). Abdominal near-infrared spectroscopy readings correlated with both decreased pulse oximetry readings during apneic episodes (r = 0.96) and increased superior mesenteric artery flow in response to glucagon-like peptide 2 (r = 0.67). CONCLUSION Abdominal near-infrared spectroscopy is capable of detecting alterations in intestinal oxygenation and perfusion in neonatal piglets and may allow early detection of neonates at risk for NEC.
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Affiliation(s)
- Andre N. Gay
- Texas Children's Hospital, Division of Pediatric Surgery, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX 77030
| | - David A. Lazar
- Texas Children's Hospital, Division of Pediatric Surgery, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX 77030
| | - Barbara Stoll
- USDA/ARS Children's Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, Texas, 77030
| | - Bindi Naik-Mathuria
- Texas Children's Hospital, Division of Pediatric Surgery, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX 77030
| | - Oren P. Mushin
- Texas Children's Hospital, Division of Pediatric Surgery, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX 77030
| | - Manuel A. Rodriguez
- Texas Children's Hospital, Division of Pediatric Surgery, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX 77030
| | - Doug Burrin
- USDA/ARS Children's Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, Texas, 77030
| | - Oluyinka Olutoye
- Texas Children's Hospital, Division of Pediatric Surgery, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX 77030,USDA/ARS Children's Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, Texas, 77030,Author for all correspondence and reprint requests to: Oluyinka Olutoye, M.B.Ch.B, Ph.D. Texas Children's Hospital 6701 Fannin, CC650.00 Houston, Texas 77030 Phone: 832-822-3135 Fax: 832-825-3141
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Bora R, Mukhopadhyay K, Saxena AK, Jain V, Narang A. Prediction of feed intolerance and necrotizing enterocolitis in neonates with absent end diastolic flow in umbilical artery and the correlation of feed intolerance with postnatal superior mesenteric artery flow. J Matern Fetal Neonatal Med 2009; 22:1092-6. [PMID: 19900051 DOI: 10.3109/14767050903029600] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVES To evaluate the role of postnatal superior mesenteric artery (SMA) flow in predicting feed intolerance and NEC in the babies who had AEDF in comparison with gestation matched SGA and AGA with normal flow. DESIGN This was a prospective cohort study conducted in 62 eligible babies admitted in NICU. Babies were enrolled in 3 groups. Group 1 (n = 23) was SGA and AEDF, group 2 (n = 20) was SGA and group 3 (n = 19) was AGA and both with normal UA flow. In all babies baseline SMA flow was measured before test feed (0.5 ml) and repeated every 15 minutes for 1 hour after the feed. RESULTS Feed intolerance was seen in 69.5% of babies in group1 (p = <0.001) as compared to 20% and 17.5% in group 2 and 3. Four (17.3%) babies developed NEC in group1 (p = 0.02) but none in other 2 groups. Baseline peak systolic velocity (PSV) and time average mean velocity (TAMV) at 60 min post feed were significantly (p = 0.01 and 0.028 respectively) lower in group1 than group3. TAMV and PSV at 60 min post feed were significantly lower (p = 0.028 and 0.03) in babies with feed intolerance as compared to no feed intolerance group. Absent end diastolic flow and hypoglycemia were independent risk factors for feed intolerance. CONCLUSION SGA babies with AEDF had higher incidence of feed intolerance and NEC. Serial SMA flow studies specially the 60 min post feed study may help in differentiating which babies are likely to develop feed intolerance.
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Affiliation(s)
- R Bora
- Division of Neonatology, Department of Pediatrics, Post Graduate Institute of Medical Education and Research, Chandigarh 160012, India
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Chia CY, Falcão MC. Peculiaridades da circulação mesentérica em recém-nascidos e suas implicações em doenças gastrintestinais do período neonatal. REVISTA PAULISTA DE PEDIATRIA 2009. [DOI: 10.1590/s0103-05822009000200014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
OBJETIVO:Descrever peculiaridades da circulação mesentérica neonatal e caracterizar fatores de suscetibilidade ao desenvolvimento de doenças gastrintestinais e alterações do fluxo sanguíneo da artéria mesentérica superior por meio da dopplerfluxometria. FONTES DE DADOS: Livros-textos e publicações indexadas no Medline e SciELO nos últimos 20 anos, utilizando-se as palavras chaves: "mesenteric artery", "superior mesenteric artery", "newborn intestinal circulation", "necrotizing enterocolitis", "doppler flow velocimetry". SÍNTESE DOS DADOS: Alterações do fluxo sanguíneo mesentérico são um dos fatores predisponentes da enterocolite necrosante, doença neonatal de alta morbimortalidade que acomete principalmente prematuros. A circulação mesentérica é peculiar no período neonatal tanto em relação ao seu estado basal, quanto à sua resposta frente a estímulos fisiológicos. Variações da irrigação mesentérica podem ser inerentes à própria fase de desenvolvimento vascular intestinal do recém-nascido pré-termo, com possíveis agravos de fatores perinatais como: insuficiência placentária, asfixia, infecção, cateterismo umbilical, drogas (indometacina e cafeína), fototerapia, alimentação artificial e progressão rápida da dieta. A dopplerfluxometria permite o estudo da irrigação de órgãos-alvo e pode quantificar o fluxo sanguíneo, a resistência vascular e predizer situações de risco para doenças do trato gastrintestinal no período neonatal. CONCLUSÕES: O recém-nascido apresenta peculiaridades de irrigação sanguínea gastrintestinal. A dopplerfluxometria da artéria mesentérica superior é um método não invasivo que determina as condições circulatórias no território intestinal.
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Papacci P, Giannantonio C, Cota F, Latella C, Semeraro CM, Fioretti M, Tesfagabir MG, Romagnoli C. Neonatal colour Doppler ultrasound study: normal values of abdominal blood flow velocities in the neonate during the first month of life. Pediatr Radiol 2009; 39:328-35. [PMID: 19189099 DOI: 10.1007/s00247-008-1112-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/25/2008] [Revised: 09/25/2008] [Accepted: 10/20/2008] [Indexed: 11/25/2022]
Abstract
BACKGROUND Doppler US to measure abdominal blood flow velocities (ABFV) is increasingly used to investigate intestinal haemodynamics in several clinical conditions in neonates. Studies that provide reference values of ABFV during the entire neonatal period are currently lacking. OBJECTIVE To make available normal reference values of ABFV and Doppler indices in the coeliac trunk and superior mesenteric artery during the first month of life in term and healthy preterm infants. MATERIALS AND METHODS ABFV were obtained with colour Doppler US in 69 neonates (12 term, 57 preterm) divided into four gestational age groups (25-28 weeks, 29-32 weeks, 33-36 weeks, and 37-41 weeks). RESULTS ABFV increased with increasing gestational and postnatal age. We also provide normal reference values of ABFV and Doppler indices to compare with measurements of abdominal blood flow changes during the neonatal period for diagnostic, therapeutic and prognostic purposes. CONCLUSION These longitudinal reference values provide a useful tool for assessing possible alteration in ABFV secondary to neonatal pathologies.
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Affiliation(s)
- Patrizia Papacci
- Department of Paediatrics, Division of Neonatology, Sacro Cuore Catholic University, Rome, Italy.
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Ersch J, Baenziger O, Bernet V, Bucher HU. Feeding problems in preterm infants of preeclamptic mothers. J Paediatr Child Health 2008; 44:651-5. [PMID: 18717769 DOI: 10.1111/j.1440-1754.2008.01375.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
AIM Maternal disease can cause prematurity and neonatal complications, notably feeding problems. To determine the relationship between maternal disease and the nature and severity of neonatal feeding problems, we compared feeding profiles, time to demand feeding and length of hospital stay between preterm infants of preeclamptic mothers, mothers with amniotic infection and mothers with other disease causing prematurity. METHODS The retrospective study used labour ward data collected from 2002 to 2005 in a tertiary university centre to analyse three groups of singletons born at <32 completed gestational weeks to mothers with preeclampsia (n = 61), amniotic infection (n = 55) and non-preeclamptic non-amniotic infection controls (n = 55). The groups were similar in gestational age, birthweight and sex ratio; all infants received enteral feeding according to departmental guidelines. Feeding profiles and enteral/oral nutrition were compared. RESULTS Feeding problems occurred in 46% of the preeclamptic group, 11% of the amniotic infection group and 13% of controls. Full oral demand feeding was established at 36 0/7 weeks postmenstrual age, 35 3/7 weeks (P = 0.03) and 35 2/7 weeks (P < 0.0001), respectively. Feeding problems were the main cause of delay (7-10 days) in hospital discharge in the preeclamptic group (P = 0.0002). CONCLUSIONS Feeding problems are greater, and hospital stay longer, in preterm infants of preeclamptic mothers than in other preterm infants.
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Affiliation(s)
- Jörg Ersch
- Department of Neonatology, University Hospital Zurich, Zurich, Swizerland.
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Havranek T, Johanboeke P, Madramootoo C, Carver JD. Umbilical artery catheters do not affect intestinal blood flow responses to minimal enteral feedings. J Perinatol 2007; 27:375-9. [PMID: 17392839 DOI: 10.1038/sj.jp.7211691] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
OBJECTIVE To investigate the effects of umbilical artery catheters (UACs) on superior mesenteric artery (SMA) blood flow velocity (BFV) following enteral feedings in very low birth weight preterm infants. STUDY DESIGN Very low birth weight preterm infants who had UACs inserted as part of standard clinical care were enrolled in this prospective study. On the day the UAC was scheduled to be removed, pre- and postprandial SMA BFV (mean, peak systolic and end diastolic velocities) were measured in conjunction with a minimal enteral feeding given while the UAC was in place. The same measurements were made with the next feeding given after the UAC was removed. Preprandial measurements were made at least 3 h after the last enteral feeding, and postprandial measurements were made 30, 45 and 60 min after the feeding began. The same volume and type of feeding were used for both studies. RESULTS The birth weight and gestational age of the 19 infants who completed the study were 1014+/-221 g and 27.4+/-1.9 weeks, respectively. Infants were 4.6+/-1.7-days-old when the first SMA BFV measurement was made, the volume of enteral feedings was 1.3+/-0.6 ml, and the time between the two enteral feedings was 4.7+/-3.2 h. Preprandial SMA BFV did not differ with the UAC in place compared with the UAC removed. Peak postprandial velocities were at 45 min after feedings began. The percent increase from baseline was not significantly different with the UAC in place compared with the UAC removed. CONCLUSIONS Preprandial SMA BFV and postprandial SMA BFV responses to minimal enteral feedings were not affected by the presence of a UAC.
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Affiliation(s)
- T Havranek
- Department of Pediatrics, Division of Neonatology, University of South Florida College of Medicine, Tampa, FL 33706, USA.
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Abstract
UNLABELLED This study investigated weight patterns of infants born SGA, in relation to two different feeding regimens during hospital stay. We compared 21 SGA infants prescribed 200 mL/kg milk on day 2, with 21 infants, prescribed 170 mL/kg on day 9. The infants fed according to the proactive nutrition policy tolerated large volumes of milk and showed lower weight loss. CONCLUSION A proactive nutrition policy demonstrably reduces weight loss in SGA infants.
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Affiliation(s)
- E-L Funkquist
- Department of Women's and Children's Health, Uppsala University, Uppsala, Sweden.
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Patole S. Strategies for prevention of feed intolerance in preterm neonates: a systematic review. J Matern Fetal Neonatal Med 2006; 18:67-76. [PMID: 16105795 DOI: 10.1080/14767050500127724] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Postnatal growth restriction and failure to thrive have been recently identified as a major issue in preterm, especially extremely-low-birth-weight neonates. An increased length of time to reach full enteral feedings is also significantly associated with a poorer mental outcome in preterm neonates at 24 months corrected age. Optimization of enteral nutrition without increasing the risk of necrotizing enterocolitis (NEC) has thus become a priority in preterm neonates. A range of feeding strategies currently exists for preventing/minimizing feed intolerance in preterm neonates reflecting the dilemma surrounding the definition and significance of signs of feed intolerance due to ileus of prematurity and the fear of NEC. The results of a systematic review of current strategies for preventing/minimizing feed intolerance in preterm neonates are discussed. The need for clinical research in the area of signs of feed intolerance is emphasized to develop a scientific basis to feeding strategies. Only large pragmatic trials based on such strategies will reveal whether the benefits (improved growth and long term neurodevelopmental outcomes) of aggressive enteral nutrition can outweigh the risks of a potentially devastating illness like NEC, and of prolonged parenteral nutrition in preterm neonates.
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Affiliation(s)
- Sanjay Patole
- Department of Neonatal Paediatrics, King Edward Memorial Hospital for Women and University of Western Australia, Perth, Australia.
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