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Dera-Szymanowska A, Filipowicz D, Misan N, Szymanowski K, Chillon TS, Asaad S, Sun Q, Szczepanek-Parulska E, Schomburg L, Ruchała M. Are Twin Pregnancies at Higher Risk for Iron and Calcium Deficiency than Singleton Pregnancies? Nutrients 2023; 15:4047. [PMID: 37764830 PMCID: PMC10535332 DOI: 10.3390/nu15184047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Revised: 09/06/2023] [Accepted: 09/12/2023] [Indexed: 09/29/2023] Open
Abstract
The aim of this study was to compare the iron and calcium status in singleton and twin pregnancies and to assess whether there is an increased risk for iron and calcium deficiency in twin gestation. The study included 105 singleton and 9 twin pregnancies at or above 35 weeks of gestation. Information on prenatal supplementation with iron or calcium was acquired, and adverse perinatal outcomes were recorded. Biosamples from all 114 mothers and 73 newborns (61 singleton and 12 twin newborns) were finally analyzed. Total iron and calcium concentrations in serum were measured through total reflection X-ray fluorescence analysis. The results indicated no significant differences in maternal serum iron and calcium concentrations between singleton and twin pregnancies. Similarly, iron and calcium concentrations in newborn umbilical cord serum samples were not different between singleton and twin pregnancies. The comparison of total iron and calcium between mothers and umbilical cord serum indicated significantly lower concentrations in the mothers, with the differences being not homogenous but rather pair-specific. A significant positive correlation between maternal serum and umbilical cord serum calcium concentration was noticed. Prenatal iron supplementation was associated with higher iron concentrations in both mothers and newborns, supporting the efficiency of supplementation and the quality of the study methods. Collectively, the data indicate no significant differences in serum iron and calcium concentrations with regard to singleton or twin pregnancies and the efficiency of iron supplementation during pregnancy for increasing iron status.
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Affiliation(s)
- Anna Dera-Szymanowska
- Department of Perinatology and Gynecology, Poznan University of Medical Sciences, Polna 33, 60-535 Poznan, Poland
| | - Dorota Filipowicz
- Department of Endocrinology, Metabolism and Internal Medicine, Poznan University of Medical Sciences, Przybyszewskiego 49, 60-355 Poznan, Poland
| | - Natalia Misan
- Department of Perinatology and Gynecology, Poznan University of Medical Sciences, Polna 33, 60-535 Poznan, Poland
| | - Krzysztof Szymanowski
- Department of Perinatology and Gynecology, Poznan University of Medical Sciences, Polna 33, 60-535 Poznan, Poland
| | - Thilo Samson Chillon
- Institute for Experimental Endocrinology, Charité-Universitätsmedizin Berlin, D-10115 Berlin, Germany
| | - Sabrina Asaad
- Institute for Experimental Endocrinology, Charité-Universitätsmedizin Berlin, D-10115 Berlin, Germany
| | - Qian Sun
- Institute for Experimental Endocrinology, Charité-Universitätsmedizin Berlin, D-10115 Berlin, Germany
| | - Ewelina Szczepanek-Parulska
- Department of Endocrinology, Metabolism and Internal Medicine, Poznan University of Medical Sciences, Przybyszewskiego 49, 60-355 Poznan, Poland
| | - Lutz Schomburg
- Institute for Experimental Endocrinology, Charité-Universitätsmedizin Berlin, D-10115 Berlin, Germany
| | - Marek Ruchała
- Department of Endocrinology, Metabolism and Internal Medicine, Poznan University of Medical Sciences, Przybyszewskiego 49, 60-355 Poznan, Poland
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Le J, Lv ZH, Peng R, Li Y, Wang ST. Evaluation of Vitamin D Status and the Analysis of Risk Factors of Vitamin D Deficiency in Twin Pregnancies. Lab Med 2023; 54:534-542. [PMID: 36869835 DOI: 10.1093/labmed/lmad005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/05/2023] Open
Abstract
OBJECTIVE Optimization of maternal vitamin D (VD) status has beneficial effects on pregnancies, but little is known about it of twin pregnancies (TP). Our aim was to promote the current understanding of VD status and its associated factors in TP. METHODS We performed liquid chromatography-tandem mass spectrometry to quantify 25-hydroxyvitamin D [25(OH)D] and used the enzyme-linked immunosorbent assay method to detect vitamin D binding protein (VDBP) in 218 singleton pregnancies (SP) and 236 TP. RESULTS Levels of 25(OH)D and VDBP were higher in TP than SP. The 25(OH)D, free 25(OH)D, C-3 epimer of 25-hydroxyvitamin D [epi-25(OH)D], and VDBP all increased with gestational progress. Age, body
mass index, and hemoglobin level were associated with VD deficiency (VDD). Analysis of covariance demonstrated that the 25(OH)D and VDBP of TP and SP still showed differences after adjusting for the above associated factors. CONCLUSION Differences in VD status were found in SP and TP, suggesting that the assessment of VD status in TP should be treated with caution. High VDD prevalence is observed among pregnant Chinese women, and it is recommended to promote evaluation for VDD.
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Affiliation(s)
- Juan Le
- Department of Clinical Laboratory, Wuhan University, Renmin Hospital, Wuhan, China
| | - Zhi-Hua Lv
- Department of Clinical Laboratory, Wuhan University, Renmin Hospital, Wuhan, China
| | - Rui Peng
- Department of Clinical Laboratory, Wuhan University, Renmin Hospital, Wuhan, China
| | - Yan Li
- Department of Clinical Laboratory, Wuhan University, Renmin Hospital, Wuhan, China
| | - Shao-Ting Wang
- Department of Clinical Laboratory, Wuhan University, Renmin Hospital, Wuhan, China
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3
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Akbar A, Duvall S, VanOrmer M, Slotkowski R, Hahka T, Genaro-Mattos T, Korade Z, Hanson C, Anderson Berry A, Thoene M. Plasma Retinol Concentrations and Dietary Intakes of Mother-Infant Sets in Singleton versus Twin Pregnancy. Nutrients 2023; 15:nu15112553. [PMID: 37299515 DOI: 10.3390/nu15112553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 05/26/2023] [Accepted: 05/29/2023] [Indexed: 06/12/2023] Open
Abstract
Vitamin A (retinol) is essential for normal fetal development, but the recommendation for maternal dietary intake (Retinol Activity Equivalent, RAE) does not differ for singleton vs. twin pregnancy, despite the limited evaluation of retinol status. Therefore, this study aimed to evaluate plasma retinol concentrations and deficiency status in mother-infant sets from singleton vs. twin pregnancies as well as maternal RAE intake. A total of 21 mother-infant sets were included (14 singleton, 7 twin). The HPLC and LC-MS/HS evaluated the plasma retinol concentration, and data were analyzed using the Mann-Whitney U test. Plasma retinol was significantly lower in twin vs. singleton pregnancies in both maternal (192.2 vs. 312.1 vs. mcg/L, p = 0.002) and umbilical cord (UC) samples (102.5 vs. 154.4 vs. mcg/L, p = 0.002). The prevalence of serum-defined vitamin A deficiency (VAD) <200.6 mcg/L was higher in twins vs. singletons for both maternal (57% vs. 7%, p = 0.031) and UC samples (100% vs. 0%, p < 0.001), despite a similar RAE intake (2178 vs. 1862 mcg/day, p = 0.603). Twin pregnancies demonstrated a higher likelihood of vitamin A deficiency in mothers, with an odds ratio of 17.3 (95% CI: 1.4 to 216.6). This study suggests twin pregnancy may be associated with VAD deficiency. Further research is needed to determine optimal maternal dietary recommendations during twin gestation.
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Affiliation(s)
- Anum Akbar
- Department of Pediatrics, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Sarah Duvall
- College of Allied Health Professions, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Matthew VanOrmer
- Department of Pediatrics, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Rebecca Slotkowski
- Department of Pediatrics, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Taija Hahka
- Department of Pediatrics, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Thiago Genaro-Mattos
- Munroe Meyer Institute, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Zeljka Korade
- Department of Pediatrics, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Corrine Hanson
- College of Allied Health Professions, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Ann Anderson Berry
- Department of Pediatrics, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Melissa Thoene
- Department of Pediatrics, University of Nebraska Medical Center, Omaha, NE 68198, USA
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4
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Charoenngam N, Ayoub D, Holick MF. Nutritional rickets and vitamin D deficiency: consequences and strategies for treatment and prevention. Expert Rev Endocrinol Metab 2022; 17:1-14. [PMID: 35852141 DOI: 10.1080/17446651.2022.2099374] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/06/2022] [Accepted: 07/05/2022] [Indexed: 10/17/2022]
Abstract
INTRODUCTION Rickets is typically characterized by bone deformities due to defective bone mineralization and chondrocyte maturation in growing bones. However, infantile rickets often goes unrecognized, because the skeletal abnormalities are more subtle and often can only be detected radiologically. Nutritional rickets is a major public health concern in several regions worldwide. It is most commonly caused by vitamin D and/or calcium deficiency. AREA COVERED We provide an overview of historical perspective, epidemiology, and pathophysiology of nutritional rickets. Additionally, we outline diagnostic approaches and highlight challenges in radiographic diagnosis of rickets. Finally, we present strategies for prevention and treatment of rickets. EXPERT OPINION Despite the evidence from clinical databases that rickets is a rare disease, it is likely that rickets is clinically underdiagnosed as studies designed to screen healthy children for radiographic evidence of rickets reported surprisingly much higher prevalence. It has been reported that some of the radiologic features of rickets can be misinterpreted as fractures. To prevent nutritional rickets, most if not all infants and young children, should receive vitamin D from formulas and foods that are fortified with vitamin D or supplementation to achieve a serum 25-hydroxyvitamin D of at least 20 ng/mL as recommended by the Institute of Medicine. It has been recommended by the Endocrine Society that to achieve maximum bone health for children and adults, a serum concentration of 25-hydroxyvitamin D should be at least 30 ng/mL and preferably 40-60 ng/mL. Pregnant women who are unable to obtain an adequate amount of vitamin D from sunlight exposure and natural and fortified diets should take a vitamin D supplement of 1500-2000 IUs daily as recommended by the Endocrine Society since it has been demonstrated that 600 IUs daily will not maintain a circulating 25-hydroxyvitamin D of at least 20 ng/mL and most pregnant women. If lactating women take approximately 6400 IUs of vitamin D daily, they provide enough vitamin D in their milk to satisfy their infant's requirement thereby preventing rickets.
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Affiliation(s)
- Nipith Charoenngam
- Section Endocrinology, Diabetes, Nutrition and Weight Management, Department of Medicine, Boston University School of Medicine, Boston, MA, USA
- Department of Medicine, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
- Department of Medicine, Mount Auburn Hospital, Harvard Medical School, Cambridge, MA, USA
| | | | - Michael F Holick
- Section Endocrinology, Diabetes, Nutrition and Weight Management, Department of Medicine, Boston University School of Medicine, Boston, MA, USA
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Wierzejska RE. Review of Dietary Recommendations for Twin Pregnancy: Does Nutrition Science Keep Up with the Growing Incidence of Multiple Gestations? Nutrients 2022; 14:1143. [PMID: 35334799 PMCID: PMC8953105 DOI: 10.3390/nu14061143] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Revised: 03/03/2022] [Accepted: 03/07/2022] [Indexed: 02/04/2023] Open
Abstract
Recommendations for nutrition and the use of dietary supplements for pregnant women are updated on regular basis but it remains to be seen to what extent they may be applicable in twin pregnancies. The aim of this narrative review is to present the current state of knowledge about the energy and nutrient demand in twin pregnancy. There is general consensus in literature that the energy demand is higher than in a singleton pregnancy, but there is a lack of position statements from scientific societies on specific energy intake that is required. In turn, recommended maternal weight gain, which favors the normal weight of the neonate, has been determined. There is even a larger knowledge gap when it comes to vitamins and minerals, the body stores of which are theoretically used up faster. The greatest number of studies so far focused on vitamin D, and most of them concluded that its concentration in maternal blood is lower in twin as compared to singleton pregnancy. Few randomized studies focus on iron supplementation and there are no other studies that would assess dietary interventions. In light of a growing incidence of multiple pregnancies, more studies are necessary to establish the nutritional demands of the mother and the course of action for adequate supplementation.
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Affiliation(s)
- Regina Ewa Wierzejska
- Department of Nutrition and Nutritional Value of Food, National Institute of Public Health NIH-National Research Institute, Chocimska St. 24, 00-791 Warsaw, Poland
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Li X, Yu J, Wen L, Li Q, Yan J, Tian J, Tong C, Tong Q, Qi H, Saffery R, Kilby MD, Baker PN. Vitamin D status in women with dichorionic twin pregnancies and their neonates: a pilot study in China. BMC Pregnancy Childbirth 2021; 21:279. [PMID: 33832462 PMCID: PMC8034067 DOI: 10.1186/s12884-021-03707-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Accepted: 03/10/2021] [Indexed: 01/16/2023] Open
Abstract
Background Vitamin D deficiency is a global public health issue in women and children and is associated with adverse impacts on child growth, such as rickets. However, prior studies have mainly focused on measuring vitamin D levels in singleton pregnant women and their offspring, and very limited studies have revealed the prevalence of vitamin D deficiency in twin pregnant women and their offspring. The aim of this study was to investigate vitamin D levels in twin-pregnant women and their neonates. We also explored the correlation of maternal vitamin D levels with neonatal outcomes and infant growth. Methods A prospective subcohort investigation was carried out among 72 dichorionic, diamniotic twin-pregnant mothers and their twin offspring from the Longitudinal Twin Study. Peripheral blood was collected from the mothers in the third trimester, and cord blood was collected from neonates at birth to identify 25[OH]D levels. Data on the characteristics of the mothers and neonates were collected. Infant growth data and food sensitivities were also collected. Results The average maternal 25[OH]D level was 31.78 ng/mL, with 19.4% being deficient and 20.8% insufficient, while the average neonatal 25[OH]D level was 15.37 ng/mL, with 99.3% being deficiency or insufficient. A positive correlation was found between maternal and neonatal 25[OH]D levels (beta-value: 0.43, 95% CI: 0.37, 0.49). Interestingly, the higher the maternal 25[OH]D level was, the smaller the cotwin birthweight discordance (beta-value: -2.67, 95% CI: − 5.11, − 0.23). In addition, the infants of mothers with vitamin D deficiency were more likely to be allergic to foods at 6 months than those of mothers with vitamin D sufficiency. Conclusions Twin neonates were at high risk of vitamin D deficiency, although their mothers’ vitamin D deficiency partially improved. Higher maternal vitamin D levels were associated with smaller discordance of cotwin birthweight. Trial registration Chinese Clinical Trial Registry ChiCTR-OOC-16008203, 1st April 2016. Supplementary Information The online version contains supplementary material available at 10.1186/s12884-021-03707-7.
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Affiliation(s)
- Xin Li
- Department of Obstetrics, The First Affiliated Hospital of Chongqing Medical University, 1 Youyi Road, Yuzhong District, Chongqing, 400016, China.,State Key Laboratory of Maternal and Fetal Medicine of Chongqing Municipality, Chongqing Medical University, Chongqing, 400016, China.,International Collaborative Laboratory of Reproduction and Development of Chinese Ministry of Education, Chongqing Medical University, Chongqing, 400016, China
| | - Jiaxiao Yu
- Department of Obstetrics, The First Affiliated Hospital of Chongqing Medical University, 1 Youyi Road, Yuzhong District, Chongqing, 400016, China.,State Key Laboratory of Maternal and Fetal Medicine of Chongqing Municipality, Chongqing Medical University, Chongqing, 400016, China.,International Collaborative Laboratory of Reproduction and Development of Chinese Ministry of Education, Chongqing Medical University, Chongqing, 400016, China
| | - Li Wen
- Department of Obstetrics, The First Affiliated Hospital of Chongqing Medical University, 1 Youyi Road, Yuzhong District, Chongqing, 400016, China.,State Key Laboratory of Maternal and Fetal Medicine of Chongqing Municipality, Chongqing Medical University, Chongqing, 400016, China.,International Collaborative Laboratory of Reproduction and Development of Chinese Ministry of Education, Chongqing Medical University, Chongqing, 400016, China
| | - Qingshu Li
- State Key Laboratory of Maternal and Fetal Medicine of Chongqing Municipality, Chongqing Medical University, Chongqing, 400016, China.,International Collaborative Laboratory of Reproduction and Development of Chinese Ministry of Education, Chongqing Medical University, Chongqing, 400016, China.,Department of Pathology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Jianying Yan
- Fujian Provincial Maternity and Children's Hospital, affiliated hospital of Fujian Medical University, Fuzhou, 350001, Fujian, China
| | - Jing Tian
- Department of Obstetrics and Gynecology, University-Town Hospital of Chongqing Medical University, Chongqing, 401331, China
| | - Chao Tong
- Department of Obstetrics, The First Affiliated Hospital of Chongqing Medical University, 1 Youyi Road, Yuzhong District, Chongqing, 400016, China. .,State Key Laboratory of Maternal and Fetal Medicine of Chongqing Municipality, Chongqing Medical University, Chongqing, 400016, China. .,International Collaborative Laboratory of Reproduction and Development of Chinese Ministry of Education, Chongqing Medical University, Chongqing, 400016, China. .,Chongqing Population and Family Planning Science and Technology Research Institute, 18 Honghuang Rd, Jiangbei District, Chongqing, 400020, China.
| | - Qi Tong
- Chongqing Population and Family Planning Science and Technology Research Institute, 18 Honghuang Rd, Jiangbei District, Chongqing, 400020, China.
| | - Hongbo Qi
- Department of Obstetrics, The First Affiliated Hospital of Chongqing Medical University, 1 Youyi Road, Yuzhong District, Chongqing, 400016, China. .,State Key Laboratory of Maternal and Fetal Medicine of Chongqing Municipality, Chongqing Medical University, Chongqing, 400016, China. .,International Collaborative Laboratory of Reproduction and Development of Chinese Ministry of Education, Chongqing Medical University, Chongqing, 400016, China. .,Department of Pathology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China.
| | - Richard Saffery
- International Collaborative Laboratory of Reproduction and Development of Chinese Ministry of Education, Chongqing Medical University, Chongqing, 400016, China.,Cancer, Disease and Developmental Epigenetics, Murdoch Children's Research Institute, Parkville, Victoria, 3052, Australia
| | - Mark D Kilby
- Centre for Women's and Newborn Health, Institute of Metabolism and Systems Research, University of Birmingham, Birmingham, B15 2TT, UK.,Fetal Medicine Centre, Birmingham Women's & Children's Foundation Trust, Edgbaston, Birmingham, B15 2TG, UK
| | - Philip N Baker
- International Collaborative Laboratory of Reproduction and Development of Chinese Ministry of Education, Chongqing Medical University, Chongqing, 400016, China.,College of Life Sciences, University of Leicester, Leicester, LE1 7RH, UK
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Zgliczynska M, Kosinska-Kaczynska K. Micronutrients in Multiple Pregnancies-The Knowns and Unknowns: A Systematic Review. Nutrients 2021; 13:nu13020386. [PMID: 33513722 PMCID: PMC7912422 DOI: 10.3390/nu13020386] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Revised: 01/22/2021] [Accepted: 01/23/2021] [Indexed: 12/12/2022] Open
Abstract
Maternal diet and nutritional status are of key importance with regard to the short- and long-term health outcomes of both the mother and the fetus. Multiple pregnancies are a special phenomenon in the context of nutrition. The presence of more than one fetus may lead to increased metabolic requirements and a faster depletion of maternal macro- and micro- nutrient reserves than in a singleton pregnancy. The aim of this systematic review was to gather available knowledge on the supply and needs of mothers with multiple pregnancies in terms of micronutrients and the epidemiology of deficiencies in that population. It was constructed in accordance with Preferred Reporting Items for Systematic Reviews and Meta-Analyses Statement (PRISMA). The authors conducted a systematic literature search with the use of three databases: PubMed/MEDLINE, Scopus and Embase. The last search was run on the 18 October 2020 and identified 1379 articles. Finally, 12 articles and 1 series of publications met the inclusion criteria. Based on the retrieved studies, it may be concluded that women with multiple pregnancies might be at risk of vitamin D and iron deficiencies. With regard to other microelements, the evidence is either inconsistent, scarce or absent. Further in-depth prospective and population studies are necessary to determine if nutritional recommendations addressed to pregnant women require adjustments in cases of multiple gestations.
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Palacios C, Trak‐Fellermeier MA, Martinez RX, Lopez‐Perez L, Lips P, Salisi JA, John JC, Peña‐Rosas JP. Regimens of vitamin D supplementation for women during pregnancy. Cochrane Database Syst Rev 2019; 10:CD013446. [PMID: 31581312 PMCID: PMC6776191 DOI: 10.1002/14651858.cd013446] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
BACKGROUND Vitamin D deficiency during pregnancy increases the risk of pre-eclampsia, gestational diabetes, preterm birth, and low birthweight. In a previous Cochrane Review we found that supplementing pregnant women with vitamin D alone compared to no vitamin D supplementation may reduce the risk of pre-eclampsia, gestational diabetes, and low birthweight and may increase the risk of preterm births if it is combined with calcium. However the effects of different vitamin D regimens are not yet clear. OBJECTIVES To assess the effects and safety of different regimens of vitamin D supplementation alone or in combination with calcium or other vitamins, minerals or nutrients during pregnancy, specifically doses of 601 international units per day (IU/d) or more versus 600 IU/d or less; and 4000 IU/d or more versus 3999 IU/d or less. SEARCH METHODS We searched the Cochrane Pregnancy and Childbirth's Trials Register, ClinicalTrials.gov, the WHO International Clinical Trials Registry Platform (ICTRP) (12 July 2018), and the reference lists of retrieved studies. SELECTION CRITERIA Randomised trials evaluating the effect of different vitamin D regimens (dose, frequency, duration, and time of commencement of supplementation during pregnancy), alone or in combination with other nutrients on pregnancy and neonatal health outcomes. We only included trials that compared 601 IU/d or more versus 600 IU/d or less and 4000 IU/d or more versus 3999 IU/d or less. We did not include in the analysis groups that received no vitamin D, as that comparison is assessed in another Cochrane Review. DATA COLLECTION AND ANALYSIS Two review authors independently: i) assessed the eligibility of studies against the inclusion criteria; ii) extracted data from included studies, and iii) assessed the risk of bias of the included studies. Our primary maternal outcomes were: pre-eclampsia, gestational diabetes, and any adverse effects; our primary infant outcomes were preterm birth and low birthweight. Data were checked for accuracy. The certainty of the evidence was assessed using the GRADE approach. MAIN RESULTS In this review, we included data from 30 trials involving 7289 women. We excluded 11 trials, identified 16 ongoing/unpublished trials and two trials are awaiting classification. Overall risk of bias for the trials was mixed.Comparison 1. 601 IU/d or more versus 600 IU/d or less of vitamin D alone or with any other nutrient (19 trials; 5214 participants)Supplementation with 601 IU/d or more of vitamin D during pregnancy may make little or no difference to the risk of pre-eclampsia (risk ratio (RR) 0.96, 95% confidence interval (CI) 0.65 to 1.42); 5 trials; 1553 participants,low-certainty evidence), may reduce the risk of gestational diabetes (RR 0.54, 95% CI 0.34 to 0.86; 5 trials; 1846 participants; moderate-certainty evidence), may make little or no difference to the risk of preterm birth (RR 1.25, 95% CI 0.92 to 1.69; 4 trials; 2294 participants; low-certainty evidence); and may make little or no difference to the risk of low birthweight (RR 0.90, 95% CI 0.66 to 1.24; 4 trials; 1550 participants; very low-certainty evidence) compared to women receiving 600 IU/d or less.Comparison 2. 4000 IU or more versus 3999 IU or less of vitamin D alone (15 trials; 4763 participants)Supplementation with 4000 IU/d or more of vitamin D during pregnancy may make little or no difference to the risk of: pre-eclampsia (RR 0.87, 95% CI 0.62 to 1.22; 4 trials, 1903 participants, low-certainty evidence); gestational diabetes (RR 0.89, 95% CI 0.56 to 1.42; 5 trials, 2276 participants; low-certainty evidence); preterm birth (RR 0.85, 95% CI 0.64 to 1.12; 6 trials, 2948 participants, low-certainty evidence); and low birthweight (RR 0.92, 95% CI 0.49 to 1.70; 2 trials; 1099 participants; low-certainty evidence) compared to women receiving 3999 IU/d or less.Adverse events (such as hypercalcaemia, hypocalcaemia, hypercalciuria, and hypovitaminosis D) were reported differently in most trials; however, in general, there was little to no side effects reported or similar cases between groups. AUTHORS' CONCLUSIONS Supplementing pregnant women with more than the current vitamin D recommendation may reduce the risk of gestational diabetes; however, it may make little or no difference to the risk of pre-eclampsia, preterm birth and low birthweight. Supplementing pregnant women with more than the current upper limit for vitamin D seems not to increase the risk of the outcomes evaluated. In general, the GRADE was considered low certainty for most of the primary outcomes due to serious risk of bias and imprecision of results. With respect to safety, it appears that vitamin D supplementation is a safe intervention during pregnancy, although the parameters used to determine this were either not reported or not consistent between trials. Future trials should be consistent in their reports of adverse events. There are 16 ongoing trials that when published, will increase the body of knowledge.
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Affiliation(s)
- Cristina Palacios
- Robert Stempel College of Public Health and Social Work, Florida International UniversityDepartment of Dietetics and Nutrition11200 SW 8th Street, AHC 5 – 323MiamiFloridaUSA33199
| | - Maria Angelica Trak‐Fellermeier
- University of Puerto RicoCenter for Clinical Research and Health PromotionMedical Science Campus Suite A107, PO Box 365067San JuanPuerto RicoPR00935
| | | | - Lucero Lopez‐Perez
- WHO ConsultantIsla del Socorro 7Col. Prado VallejoTlalnepantlaMexico54170
| | - Paul Lips
- VU University Medical CenterInternal Medicine, Endocrine SectionP.O. Box 7057AmsterdamNetherlands1071 MC
| | - James A Salisi
- WHO Regional Office of the Western PacificNutrition Unit, Division of Non‐communicable Diseases and Health through the Life‐courseUN AvenueManilaPhilippines1000
| | - Jessica C John
- Eat, Drink and Be Healthy173 Eastern Main RoadTunapunaTrinidad and Tobago
| | - Juan Pablo Peña‐Rosas
- World Health OrganizationEvidence and Programme Guidance, Department of Nutrition for Health and Development20 Avenue AppiaGenevaGESwitzerland1211
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9
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Savard C, Gagnon C, Morisset AS. Disparities in the timing and measurement methods to assess vitamin D status during pregnancy: A Narrative Review. INT J VITAM NUTR RES 2019; 88:176-189. [PMID: 30747608 DOI: 10.1024/0300-9831/a000507] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Studies that examined associations between low circulating 25-hydroxyvitamin D (25(OH)D) and adverse pregnancy outcomes used various designs, assay methods and time points for measurement of 25(OH)D concentrations, which creates some confusion in the current literature. We aimed to investigate the variability in the timing and measurement methods used to evaluate vitamin D status during pregnancy. Analysis of 198 studies published between 1976 and 2017 showed an important variability in the choice of 1) threshold values for 25(OH)D insufficiency or deficiency, 2) 25(OH)D measurement methods, and 3) trimester in which 25(OH)D concentrations were measured. Blood samples were taken once during pregnancy in a large majority of studies, which may not be representative of vitamin D status throughout pregnancy. Most studies reported adjustment for confounding factors including season of blood sampling, but very few studies used the 25(OH)D gold standard assay, the LC-MS/MS. Prospective studies assessing maternal 25(OH)D concentrations 1) by standardized and validated methods, 2) at various time points during pregnancy, and 3) after considering potential confounding factors, are needed.
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Affiliation(s)
- Claudia Savard
- 1 School of Nutrition, Laval University.,2 Endocrinology and Nephrology Unit, CHU of Québec-Université Laval Research Center, Québec, Canada.,3 Institute of Nutrition and Functional Foods, Laval University Quebec City, Québec, Canada
| | - Claudia Gagnon
- 2 Endocrinology and Nephrology Unit, CHU of Québec-Université Laval Research Center, Québec, Canada.,3 Institute of Nutrition and Functional Foods, Laval University Quebec City, Québec, Canada.,4 Department of Medicine, Laval University, Quebec City, Québec, Canada
| | - Anne-Sophie Morisset
- 1 School of Nutrition, Laval University.,2 Endocrinology and Nephrology Unit, CHU of Québec-Université Laval Research Center, Québec, Canada.,3 Institute of Nutrition and Functional Foods, Laval University Quebec City, Québec, Canada
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Affiliation(s)
- R Goswami
- Departments of *Endocrinology and Metabolism, AIIMS; and #Pediatrics and Clinical Epidemiology, Sitaram Bhartia Institute of Science and Research; New Delhi, India.
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