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Alcohol consumption during pregnancy by women from southern Brazil: a cross-sectional study

ABSTRACT

BACKGROUND:

Some maternal characteristics are related to alcohol intake during pregnancy, which irreversibly compromises the maternal-fetal binomial integrity.

OBJECTIVES:

To identify the frequency, impact, and factors associated with alcohol consumption during pregnancy.

DESIGN AND SETTING:

A cross-sectional study was performed at the Hospital Materno Infantil Presidente Vargas (HMIPV) in Porto Alegre/RS between March and December 2016.

METHODS:

A structured questionnaire was administered along with a medical records review. They refer to the maternal sociodemographic and gestational status, alcohol consumption patterns, and characteristics of the fetus/newborn. In the statistical analysis, P values < 0.05 were considered significant.

RESULTS:

The frequency of alcohol intake was 37.3%; this was characterized by the consumption of fermented beverages (89.3%), especially during the first trimester (79.6%). Risky consumption (high and/or early) occurred for 30.2% of participants. Risk factors associated with maternal alcohol consumption during pregnancy were tobacco use (P < 0.001) and abortion attempt (P = 0.023). Living with a partner (P = 0.002) and planning pregnancy (P = 0.009) were protective factors. Risky consumption was related to all of the aforementioned variables as well as threatened abortion (P = 0.023).

CONCLUSIONS:

Alcohol intake during pregnancy is common and affects nearly one-third of pregnant women. Knowledge of the population at risk and protective factors is essential for the development of campaigns that seek to reduce consumption and, therefore, its consequences for the mother and fetus.

KEY WORDS (MeSH terms):
Alcohol Drinking; Pregnancy; Tobacco Smoking; Risk factors; Pregnancy Outcome

AUTHORS’ KEY WORDS:
Alcohol Intake; Family Planning; Gestation

INTRODUCTION

Health problems related to alcohol consumption are usually associated with males. However, changes in the social role of women have led to a decrease in this difference.11. Marangoni SR, Oliveira ML. Fatores desencadeantes do uso de drogas de abuso em mulheres. Texto Context Enferm. 2013;22(3):662-70. https://doi.org/10.1590/S0104-07072013000300012.
https://doi.org/10.1590/S0104-0707201300...
Over time, a progressive rise in the use and abuse of alcohol by women has been observed,22. De Andrade AG. Álcool e Saúde dos Brasileiros. 1st ed. Vol. 1. São Paulo: CISA; 2021. Available from: https://cisa.org.br/images/upload/Panorama_Alcool_Saude_CISA2021.pdf. Accessed in 2023 (May 21).
https://cisa.org.br/images/upload/Panora...
even at childbearing age, which has led to an increasing number of obstetric and neonatal complications.33. Santana RA, Almeida LF, Monteiro DL. Síndrome alcoólica fetal–revisão sistematizada. Rev HUPE. 2014;13(3):61-6. https://doi.org/10.12957/rhupe.2014.12128.
https://doi.org/10.12957/rhupe.2014.1212...
According to the World Health Organization (WHO), the global prevalence of alcohol intake is 9.8%.44. World Health Organization. Guidelines for the identification and management of substance use and substance use disorders in pregnancy. Geneva: WHO, 2014. Available from: https://www.who.int/publications/i/item/9789241548731. Accessed in 2023 (Jun. 21).
https://www.who.int/publications/i/item/...
In Brazil, this reality is even more concerning, with frequencies ranging from 6% to 60%.55. Rocha PC, Britto e Alves MT, Chagas DC, et al. Prevalence of illicit drug use and associated factors during pregnancy in the BRISA cohort. Cad Saude Publica. 2016;32(1):S0102-311X2016000100707. PMID: 26886368; https://doi.org/10.1590/0102-311x00192714.
https://doi.org/10.1590/0102-311x0019271...

6. Sbrana M, Grandi C, Brazan M, et al. Alcohol consumption during pregnancy and perinatal results: a cohort study. Sao Paulo Med J. 2016;134(2):146-52. PMID: 27007799; https://doi.org/10.1590/1516-3180.2015.02040211.
https://doi.org/10.1590/1516-3180.2015.0...
-77. França VT, Ferrari L, Ebert JP, et al. Avaliação do uso de drogas por gestantes atendidas em hospital de ensino do interior do Rio Grande do Sul. Rev Epidemiol Control Infec. 2016;6(2):68-73. https://doi.org/10.17058/reci.v6i2.6976.
https://doi.org/10.17058/reci.v6i2.6976...

Some maternal characteristics are associated with an increased frequency and amount of alcohol intake during pregnancy. These include lifestyle, psychological factors, alcohol consumption patterns, concomitant drug use, social vulnerability, and aspects related to family structure, such as single motherhood.88. Montag AC. Fetal alcohol-spectrum disorders: identifying at-risk mothers. Int J Womens Health. 2016;8:311-23. PMID: 27499649; https://doi.org/10.2147/ijwh.s85403.
https://doi.org/10.2147/ijwh.s85403...
The lack of prenatal care and pregnancy planning also appears to be important predisposing factors.99. Mesquita MA, Segre CA. Freqüência dos efeitos do álcool no feto e padrão de consumo de bebidas alcoólicas pelas gestantes de maternidade pública da cidade de São Paulo. J Human Growth Developm. 2009;19(1):63-77. https://doi.org/10.7322/jhgd.19903.
https://doi.org/10.7322/jhgd.19903...
,1010. Dejong K, Olyaei A, Lo JO. Alcohol use in pregnancy. Clin Obstet Gynecol. 2019;62(1):142-55. PMID: 30575614; https://doi.org/10.1097/grf.0000000000000414.
https://doi.org/10.1097/grf.000000000000...

Alcohol can cause injuries in one in every 100 live births exposed during pregnancy,1111. Carson G, Cox LV, Crane J, et al. Alcohol use and pregnancy consensus clinical guidelines. J Obstet Gynaecol Can. 2010;32(8 Suppl 3):S1-31. PMID: 21172102; https://doi.org/10.1016/s1701-2163(16)34633-3.
https://doi.org/10.1016/s1701-2163(16)34...
and there is no safe consumption amount. Therefore, abstinence is the best and safest conduct to be followed.1212. American College of Obstetricians and Gynecologists. Committee opinion no. 496: At-risk drinking and alcohol dependence: obstetric and gynecologic implications. Obstet Gynecol. 2011;118(2 Pt 1):383-8. PMID: 21775870; https://doi.org/10.1097/aog.0b013e31822c9906.
https://doi.org/10.1097/aog.0b013e31822c...
Alcohol directly acts on fetal and maternal-fetal tissue and, indirectly, on nutrients and oxygen supply, which can result in devastating and irreversible effects on the embryo/fetus.1313. Tan CH, Denny CH, Cheal NE, Sniezek JE, Kanny D. Alcohol use and binge drinking among women of childbearing age - United States, 2011-2013. MMWR Morb Mortal Wkly Rep. 2015;64(37):1042-6. PMID: 26401713; https://doi.org/10.15585/mmwr.mm6437a3.
https://doi.org/10.15585/mmwr.mm6437a3...
Consequently, the spectrum of fetal consequences may be wider, ranging from only cognitive and behavioral disorders to fetal alcohol syndrome.1414. Suttie M, Foroud T, Wetherill L, et al. Facial dysmorphism across the fetal alcohol spectrum. Pediatrics. 2013;131(3):e779-88. PMID: 23439907; https://doi.org/10.1542/peds.2012-1371.
https://doi.org/10.1542/peds.2012-1371...
,1515. Segre CAM, coord. Efeitos do álcool na gestante, no feto e no recém-nascido. São Paulo: Sociedade de Pediatria de São Paulo; 2010. Available from: https://www.spsp.org.br/downloads/AlcoolSAF2.pdf. Accessed in 2023 (Jun. 21).
https://www.spsp.org.br/downloads/Alcool...

Thus, these effects and consequences highlight the importance of early detection and profiling of women at risk of alcohol use during pregnancy. This will enable the development of more effective management and follow-up approaches.

OBJECTIVE

Considering the scarcity of Brazilian epidemiological studies related to this issue, our aim was to identify the impact and factors associated with alcohol intake in pregnant women who gave birth at a reference hospital in southern Brazil.

METHODS

This was a prospective cross-sectional study carried out at the Hospital Materno Infantil Presidente Vargas (HMIPV) that included pregnant and postpartum women and their respective newborns who utilized the hospital’s obstetrics service at birth from March to December 2016. All patients were users of the Unified Health System (in Portuguese, Sistema Único de Saúde – SUS), which is the current public health system in Brazil. The HMIPV is located at Porto Alegre and is a reference hospital for maternal and child care in the State of Rio Grande do Sul (RS).

Trained members conducted a pilot study and applied the clinical protocol. Data were collected through direct interviews with puerperal women during rooming in shortly after delivery. The medical records of the mothers and their respective newborns were also reviewed. The data collected included sociodemographic and gestational history findings, fetuse/newborns characteristics, and the use of drugs, including alcohol, during pregnancy. The sample comprised 570 women who were divided into two groups: 1) those who did and 2) did not consume alcohol during pregnancy.

Maternal age was stratified into women aged 20 years or younger, those 21–34 years, and those 35 years or older.1616. Santos GH, Martins MG, Sousa MS, Batalha SJ. Impact of maternal age on perinatal outcomes and mode of delivery. Rev Bras Ginecol Obstet. 2009;31(7):326-34. PMID: 19838577; https://doi.org/10.1590/S0100-72032009000700002.
https://doi.org/10.1590/S0100-7203200900...
Origin was classified by whether the patient lived in Porto Alegre, metropolitan region, or countryside town of the state. Puerperal women’s education was classified as incomplete elementary education, complete elementary education, and complete secondary education to higher education.1717. Greco SMSS, coord. Empreendedorismo no Brasil: 2016. Curitiba: IBQP; 2017. Available from: https://ibqp.org.br/wp-content/uploads/2017/07/AF-GEM-Nacional-BAIXA.pdf. Accessed in 2023 (Jun. 21).
https://ibqp.org.br/wp-content/uploads/2...
The number of residents per house into two groups: from one to five and from six to 14 individuals.1818. Fonseca VM, Sichieri R, Basilio L, Ribeiro LVC. Consumo de folato em gestantes de um hospital público do Rio de Janeiro. Rev Bras Epidemiol. 2003;6(4):319-27. https://doi.org/10.1590/S1415-790X2003000400006.
https://doi.org/10.1590/S1415-790X200300...
Family income was categorized into one minimum wage (BRL 880.00 at the moment of the study) or more per household. Women were divided into primiparous or multiparous groups according to their number of pregnancies.1919. Linhares JJ, Macêdo NM, Arruda GM, et al. Factors associated with mode of delivery in women with pre-eclampsia. Rev Bras Ginecol Obstet. 2014;36(6):259-63. PMID: 25099465; https://doi.org/10.1590/s0100-720320140004812.
https://doi.org/10.1590/s0100-7203201400...
Prenatal care was divided by trimester of beginning (in first, second, or third)2020. Linhares AO, Cesar JA. Suplementação com ácido fólico entre gestantes no extremo Sul do Brasil: prevalência e fatores associados. Ciên Saúde Colet. 2017;22(2):535-42. https://doi.org/10.1590/1413-81232017222.06302016.
https://doi.org/10.1590/1413-81232017222...
and by consultations number (fewer than six or six or more).2121. Brasil. Humanização do parto – humanização no pré-natal e nascimento. Brasília-DF: Ministério da Saúde; 2002. Available from: http://bvsms.saude.gov.br/bvs/publicacoes/parto.pdf. Accessed in 2023 (Jun. 21).
http://bvsms.saude.gov.br/bvs/publicacoe...

Women were asked about quarter(s) of alcohol consumption; alcohol amount consumed and intensity, frequency, and type of drink. All beverage measurements were converted and presented according to international (10 g of pure alcohol per serving)2222. World Health Organization. Self-help strategies for cutting down or stopping substance use: a guide. Geneva: WHO; 2010. Available from: https://www.who.int/publications/i/item/9789241599405. Accessed in 2023 (Jun. 21).
https://www.who.int/publications/i/item/...
and national standards (14 g of pure alcohol per serving). This corresponds to approximately 350 mL of beer, 150 mL of wine, or 45 mL of hard liquor.22. De Andrade AG. Álcool e Saúde dos Brasileiros. 1st ed. Vol. 1. São Paulo: CISA; 2021. Available from: https://cisa.org.br/images/upload/Panorama_Alcool_Saude_CISA2021.pdf. Accessed in 2023 (May 21).
https://cisa.org.br/images/upload/Panora...

Alcohol consumption amount was categorized as low (1–20 g/day), moderate (21–40 g/day) or high (≥ 41 g/day).2323. World Health Organization, Babor TF, Higgins-Biddle JC, Saunders JB, Monteiro MG. AUDIT: The alcohol use disorders identification test: Guidelines for use in primary health care. Geneva: WHO; 2001. Available from: https://apps.who.int/iris/handle/10665/67205. Accessed in 2023 (Jun. 21).
https://apps.who.int/iris/handle/10665/6...
Binge drinking episodes and heavy episodic drinking were assessed according to WHO guidelines and defined as the consumption of 60 g or more of pure alcohol, or about four servings or more on at least one occasion.2222. World Health Organization. Self-help strategies for cutting down or stopping substance use: a guide. Geneva: WHO; 2010. Available from: https://www.who.int/publications/i/item/9789241599405. Accessed in 2023 (Jun. 21).
https://www.who.int/publications/i/item/...
Drink types were questioned and classified into fermented (beer, sparkling wine, and wine) and distillates (whiskey, vodka, “cachaça,” “caipirinha,” and tequila). Consumption frequency was classified as monthly or less, two to four times a month, two to three times a week, or four or more times a week. Women who answered affirmatively to at least one of the following variables were categorized as engaging in risky consumption: period of use in the first trimester, consumption frequency of four or more times a week, high amount consumption (≥ 41 g/day), or positive for binge drinking episodes.2424. World Health Organization. WHO recommendations for care of the preterm or low birth weight infant. Geneva: WHO; 2022. Available from: https://www.who.int/publications/i/item/9789240058262. Accessed in 2023 (Jun. 21).
https://www.who.int/publications/i/item/...

Prematurity was defined as gestational age at birth less than 37 weeks2525. World Health Organization. Global nutrition targets 2025: low birth weight policy brief. Geneva: WHO; 2014. Available from: https://www.who.int/publications/i/item/WHO-NMH-NHD-14.5. Accessed in 2023 (Jun. 21).
https://www.who.int/publications/i/item/...
and low birth weight as below 2,500 grams.2626. Brasil. Atenção à saúde do recém-nascido: guia para os profissionais de saúde. Brasília-DF: Ministério da Saúde; 2014. Available from: https://bvsms.saude.gov.br/bvs/publicacoes/atencao_saude_recem_nascido_v1.pdf. Accessed in 2023 (Jun. 21).
https://bvsms.saude.gov.br/bvs/publicaco...
For Apgar scores, values greater or less than 7 were considered at the first and fifth minutes of life.2727. Margotto PR. Intrauterine growth curves: study of 4413 single live births of normal pregnancies. J Pediatr. 1995;71(1):11-21. PMID: 14689030; https://doi.org/10.2223/jped.696.
https://doi.org/10.2223/jped.696...
When fetal malformations were present, they were classified as isolated or multiple and specified according to the medical records description. In assessing microcephaly, the measurement of the newborns head circumference was considered both for gestational age at birth (absolute) and after correction, considering baby’s length (relative or true).2828. Moraes CL, Reichenheim ME. Screening for alcohol use by pregnant women of public health care in Rio de Janeiro, Brazil. Rev Saude Publica. 2007;41(5):695-703. PMID: 17923889; https://doi.org/10.1590/s0034-89102007000500002.
https://doi.org/10.1590/s0034-8910200700...

The results for qualitative variables are presented as frequencies and percentages, and the quantitative variables are shown as averages and standard deviations. Normality was verified using the Shapiro-Wilk test and histogram inspection. Sociodemographic and gestational factors associated with alcohol consumption were evaluated using a Poisson regression analysis with robust variance adjustment. Prevalence ratio (PR) measurements are presented with a 95% confidence interval. For multivariate analysis, variables with P < 0.20 in the Wald test were selected. To evaluate the characteristics of fetuses and live births, Student’s t-test and chi-square tests were applied, as was Fisher’s exact test when appropriate. The results were considered statistically significant at P < 0.05. The analyses were performed using SPSS statistical software (SPSS Inc., Chicago, United States, Release 22.0, 2013).

This study was approved by the Research Ethics Committee of HMIPV on October 10, 2017 (CAAE 09909712.3.1001.5329), and the Universidade Federal de Ciências da Saúde de Porto Alegre (UFCSPA) on January 12, 2018 (CAAE 9909712.3.3001.5345). The study was only performed after informed consent assignment.

RESULTS

The total sample consisted of 570 women, ages ranging from 12 to 45 years (mean 25.1, SD ± 7.1). Gestation was recognized at an average of 11.6 weeks. Paternal ages ranged from 15 to 60 years (mean 28.5, SD ± 8.5). The average number of maternal pregnancies was 2.32 (range 1–12).

Alcohol consumption was reported by 213 women (37.3%). Age was similar between women who consume and did not consume alcohol (mean age of 24.9 [SD ± 6.8] and 25.2 years [SD ± 7.2] respectively; P = 0.5887). Most women who drank alcohol during pregnancy consumed low amounts (64.2%; moderate: 16.9%; high: 18.9%). However, approximately one in every four women (24.9%) reported binge drinking episodes. Fermented beverages were the main type of beverage consumed (89.3%), with beer representing the most common (82.1%), followed by vodka (17%) and wine (9.2%). Almost 13% of women drank both fermented and distilled beverages during pregnancy. Most drank monthly or less (63.9%; two to four times a month: 27.4%; two to three times a week: 6.7%; and four or more times a week: 1.9%). The first trimester was the most commonly reported period of alcohol use (79.6%), with a decreasing trend in the other trimesters (second trimester: 48.3%; third trimester: 33.6%). Continuous use throughout pregnancy was reported by 21.8% of women.

Table 1 presents the consumption of alcoholic beverages during pregnancy according to maternal sociodemographic characteristics. There was a significant association between presence of a partner and lower alcohol consumption (PR = 0.66; 95%CI: 0.53-0.83; P < 0.001). However, beverage consumption was significant in two situations: when the pregnancy was unplanned (41.9%; PR = 0.72; 95%CI: 0.57-0.91; P = 0.006) and when some abortive intervention was carried out (71.4%; PR = 1.93; 95%CI: 1.20-3.13; P = 0.007; Table 2).

Table 1.
Consumption of alcoholic beverages according to maternal sociodemographic characteristics
Table 2.
Consumption of alcoholic beverages according to gestational characteristics

Drinking during pregnancy was associated with both concomitant use of illicit (PR = 2.20; 95%CI: 1.72-2.80; P < 0.001) and licit drugs (tobacco; PR = 1.96; 95%CI: 1.61-2.39; P < 0.001) as well as use during the first trimester of pregnancy (P < 0.001). Alcohol intake during gestation occurred in 78.3% of women who had used illicit drugs and 59.6% of those who smoked. Approximately three out of four marijuana users had consumed alcohol. Only eight women reported using cocaine (3.8%), and three crack (1.4%). All of them reported using alcohol simultaneously (Table 3).

Table 3.
Consumption of alcoholic beverages according to concomitant use of drugs during pregnancy

None fetal or newborn characteristic was associated with consumption of alcoholic beverages by women. However, ‘multiple” malformations were most predominant in the group of fetuses exposed to alcohol (46.2%; Table 4).

Table 4.
Fetus or newborn characteristics according to maternal consumption of alcoholic beverages during pregnancy

Multivariate analysis showed that trying to terminate the pregnancy increased the chance of alcohol consumption by 63% (PR = 1.63; 95%CI: 1.04-2.54; P = 0.032), while smoking increased it by 90% (PR = 1.90; 95%CI: 1.55-2.32; P < 0.0001; Table 5). However, the presence of protective factors is noteworthy. The likelihood of alcohol consumption for a pregnant woman with a partner was 23% lower than that for women with no partner (PR = 0.77; 95%CI: 0.61-0.97; P = 0.024). In addition, planning the pregnancy reduced the chance of alcohol consumption by one quarter (PR = 0.75; 95%CI: 0.59-0.94; P = 0.013; Table 5).

Table 5.
Multiple regression analysis of factors associated with alcohol consumption during pregnancy

Risky alcohol consumption was observed in 171 women (30.2%) and was associated with attempt to terminate the pregnancy (PR = 1.92; 95%CI: 1.17-3.13; P = 0.009), threat of abortion (PR = 1.45;95%CI: 1.05-1.99; P = 0.023), and tobacco use (PR = 2.10; 95%CI: 1.66-2.65; P < 0.0001). The presence of a partner (PR = 0.66; 95%CI: 0.51-0.86; P = 0.002) and planned pregnancy (PR = 0.74;95%CI: 0.56-0.97; P = 0.027) were protective factors against risky alcohol consumption (Table 6).

Table 6.
Multiple regression analysis of factors associated with risky consumption during pregnancy

DISCUSSION

This study identified a high frequency of alcohol consumption in pregnant women (37.3%), similar to other Brazilian studies, such as those that took place in São Paulo (33.3%),66. Sbrana M, Grandi C, Brazan M, et al. Alcohol consumption during pregnancy and perinatal results: a cohort study. Sao Paulo Med J. 2016;134(2):146-52. PMID: 27007799; https://doi.org/10.1590/1516-3180.2015.02040211.
https://doi.org/10.1590/1516-3180.2015.0...
Rio de Janeiro (40.6%),2828. Moraes CL, Reichenheim ME. Screening for alcohol use by pregnant women of public health care in Rio de Janeiro, Brazil. Rev Saude Publica. 2007;41(5):695-703. PMID: 17923889; https://doi.org/10.1590/s0034-89102007000500002.
https://doi.org/10.1590/s0034-8910200700...
and Teresina (32.4%).2929. Veloso LU, de Souza Monteiro CF. Prevalence and factors associated with alcohol use among pregnant adolescents. Rev Lat Am Enfermagem. 2013;21(1):433-41. PMID: 23546329; https://doi.org/10.1590/s0104-11692013000100020.
https://doi.org/10.1590/s0104-1169201300...
These frequencies are higher than those reported in developed countries (10.2%).3030. Laranjeira R, Pinsky I, Sanches M, Zaleski M, Caetano R. Alcohol use patterns among Brazilian adults. Braz J Psychiatry. 2010;32(3):231-41. PMID: 19918673; https://doi.org/10.1590/s1516-44462009005000012.
https://doi.org/10.1590/s1516-4446200900...
In addition to methodological and sampling differences, some factors, such as effectiveness of public health policies and cultural disparities, may have contributed to such inequalities.2626. Brasil. Atenção à saúde do recém-nascido: guia para os profissionais de saúde. Brasília-DF: Ministério da Saúde; 2014. Available from: https://bvsms.saude.gov.br/bvs/publicacoes/atencao_saude_recem_nascido_v1.pdf. Accessed in 2023 (Jun. 21).
https://bvsms.saude.gov.br/bvs/publicaco...
In general, alcohol consumption in developed countries is seen more negatively than in Latin America.3131. Brasil. Conhecendo os efeitos do uso de drogas na gestação e as consequências para os bebês. Brasília-DF: Ministério da Cidadania; 2021. Available from: https://www.gov.br/mds/pt-br/pt-br/noticias-e-conteudos/desenvolvimento-social/noticias-desenvolvimento-social/ministerio-da-cidadania-lanca-cartilha-sobre-efeitos-e-consequencias-do-uso-de-drogas-na-gestacao/30042021_cartilha_gestantes.pdf. Accessed in 2023 (Jun. 21).
https://www.gov.br/mds/pt-br/pt-br/notic...

The results obtained in our study about the use of alcohol in the first trimester of pregnancy and the occurrence of binge drinking episodes among pregnant women were cause for concern. They were similar to those reported by other authors99. Mesquita MA, Segre CA. Freqüência dos efeitos do álcool no feto e padrão de consumo de bebidas alcoólicas pelas gestantes de maternidade pública da cidade de São Paulo. J Human Growth Developm. 2009;19(1):63-77. https://doi.org/10.7322/jhgd.19903.
https://doi.org/10.7322/jhgd.19903...
,1010. Dejong K, Olyaei A, Lo JO. Alcohol use in pregnancy. Clin Obstet Gynecol. 2019;62(1):142-55. PMID: 30575614; https://doi.org/10.1097/grf.0000000000000414.
https://doi.org/10.1097/grf.000000000000...
and highlight the progressive tendency of the female population to consume more alcohol at abusive levels.3232. May PA, Blankenship J, Marais AS, et al. Maternal alcohol consumption producing fetal alcohol spectrum disorders (FASD): quantity, frequency, and timing of drinking. Drug Alcohol Depend. 2013;133(2):502-12. PMID: 23932841; https://doi.org/10.1016/j.drugalcdep.2013.07.013.
https://doi.org/10.1016/j.drugalcdep.201...
Early consumption of alcohol within the first trimester has been associated with a 12-fold greater chance of fetal involvement. Moreover, excessive levels of alcohol intake have increased the risk for worse neonatal outcomes.3333. Meucci RD, Saavedra JS, Silva ES, et al. Alcohol intake during pregnancy among parturients in southern Brazil. Rev Bras Saude Mater Infant. 2017;17(4):653-61. https://doi.org/10.1590/1806-93042017000400003.
https://doi.org/10.1590/1806-93042017000...

Alcohol consumption most often occurred in an occasional way and in low quantities; this fact reflects the underestimation of the harmful effects even for small amounts.1111. Carson G, Cox LV, Crane J, et al. Alcohol use and pregnancy consensus clinical guidelines. J Obstet Gynaecol Can. 2010;32(8 Suppl 3):S1-31. PMID: 21172102; https://doi.org/10.1016/s1701-2163(16)34633-3.
https://doi.org/10.1016/s1701-2163(16)34...
In addition, the drinks mainly consisted of fermented beverages, especially beer and derivatives, which may also demonstrate an underestimation of the potential risk of these beverages compared to distilled drinks.3434. Denny CH, Acero CS, Naimi TS, Kim SY. Consumption of alcohol beverages and binge drinking among pregnant women aged 18-44 years - United States, 2015-2017. MMWR Morb Mortal Wkly Rep. 2019;68(16):365-8. PMID: 31022164; https://doi.org/10.15585/mmwr.mm6816a1.
https://doi.org/10.15585/mmwr.mm6816a1...

The absence of a partner has been shown to be closely related to alcohol consumption by women during pregnancy.88. Montag AC. Fetal alcohol-spectrum disorders: identifying at-risk mothers. Int J Womens Health. 2016;8:311-23. PMID: 27499649; https://doi.org/10.2147/ijwh.s85403.
https://doi.org/10.2147/ijwh.s85403...
,99. Mesquita MA, Segre CA. Freqüência dos efeitos do álcool no feto e padrão de consumo de bebidas alcoólicas pelas gestantes de maternidade pública da cidade de São Paulo. J Human Growth Developm. 2009;19(1):63-77. https://doi.org/10.7322/jhgd.19903.
https://doi.org/10.7322/jhgd.19903...
,1313. Tan CH, Denny CH, Cheal NE, Sniezek JE, Kanny D. Alcohol use and binge drinking among women of childbearing age - United States, 2011-2013. MMWR Morb Mortal Wkly Rep. 2015;64(37):1042-6. PMID: 26401713; https://doi.org/10.15585/mmwr.mm6437a3.
https://doi.org/10.15585/mmwr.mm6437a3...
According to the Centers for Disease Control and Prevention (CDC), alcohol consumption is almost twice as common among pregnant women with no partner. In addition, the frequency of excessive consumption among these women is significantly higher.3535. Oliveira TR, Simões SMF. O consumo de bebida alcóolica pelas gestantes: um estudo exploratório. Esc Anna Nery. 2007;11(4):632-8. https://doi.org/10.1590/S1414-81452007000400012.
https://doi.org/10.1590/S1414-8145200700...
This finding is often related to other risk factors for alcohol consumption, such as unplanned pregnancies, as well as low socioeconomic status, with the mothers usually being the main or only providers of income.3636. O’Keeffe LM, Kearney PM, McCarthy FP, et al. Prevalence and predictors of alcohol use during pregnancy: findings from international multicentre cohort studies. BMJ Open. 2015;5(7):e006323. PMID: 26152324; https://doi.org/10.1136/bmjopen-2014-006323.
https://doi.org/10.1136/bmjopen-2014-006...
Notably, in the present study, the presence of a partner was a protective factor for alcohol consumption, which may be related to greater financial and emotional stability as well as family support.

Another protective factor identified in this study was pregnancy planning. There are reports in literature of substantially less alcohol consumption by women during pregnancy when there is intention and planning to become pregnant.99. Mesquita MA, Segre CA. Freqüência dos efeitos do álcool no feto e padrão de consumo de bebidas alcoólicas pelas gestantes de maternidade pública da cidade de São Paulo. J Human Growth Developm. 2009;19(1):63-77. https://doi.org/10.7322/jhgd.19903.
https://doi.org/10.7322/jhgd.19903...
,3737. Baptista FH, Rocha KBB, Martinelli JL, et al. Prevalence and factors associated with alcohol consumption during pregnancy. Rev Bras Saude Mater Infant. 2017;17(2):271-9. https://doi.org/10.1590/1806-93042017000200004.
https://doi.org/10.1590/1806-93042017000...
Failure to plan and, consequently, delay to recognize the pregnancy, can lead many women to engage in harmful behaviors, including the consumption of alcoholic beverages.1010. Dejong K, Olyaei A, Lo JO. Alcohol use in pregnancy. Clin Obstet Gynecol. 2019;62(1):142-55. PMID: 30575614; https://doi.org/10.1097/grf.0000000000000414.
https://doi.org/10.1097/grf.000000000000...
This fact helps to clarify the high frequency of alcohol intake (79.6%) during the first trimester observed in our study. In addition, women tend to be more careful about what they consume when pregnancy is planned, as they are more aware of possible risks for the fetus due to alcohol consumption.3838. Roberts SCM. The presence and consequences of abortion aversion in scientific research related to alcohol use during pregnancy. Int J Environ Res Public Health. 2019;16(16):2888. PMID: 31412544; https://doi.org/10.3390/ijerph16162888.
https://doi.org/10.3390/ijerph16162888...

The use of pregnancy termination methods was associated with risky alcohol intake in our sample. This association is well described in the literature.3939. Kesmodel U, Wisborg K, Olsen SF, Henriksen TB, Secher NJ. Moderate alcohol intake during pregnancy and the risk of stillbirth and death in the first year of life. Am J Epidemiol. 2002;155(4):305-12. PMID: 11836194; https://doi.org/10.1093/aje/155.4.305.
https://doi.org/10.1093/aje/155.4.305...
This may be linked to pregnancy rejection because it is unwanted.

Threatened abortion was the only variable that showed an exclusive association with at-risk alcohol consumption in this study. According to the literature,4040. Roberts SC, Pies C. Complex calculations: how drug use during pregnancy becomes a barrier to prenatal care. Matern Child Health J. 2011;15(3):333-41. PMID: 20232126; https://doi.org/10.1007/s10995-010-0594-7.
https://doi.org/10.1007/s10995-010-0594-...
women who consume more than five drinks per week have a significantly greater chance of miscarriage. This problem occurs because alcohol is one of the main substances responsible for childbirth-related problems.4141. Guimarães VA, Fernandes KS, Lucchese R, et al. Prevalence and factors associated with alcohol use during pregnancy in a maternity hospital in Goiás, Central Brazil. Cien Saude Colet. 2018;23(10):3413-20. PMID: 30365860; https://doi.org/10.1590/1413-812320182310.24582016.
https://doi.org/10.1590/1413-81232018231...

As previously described in the literature,55. Rocha PC, Britto e Alves MT, Chagas DC, et al. Prevalence of illicit drug use and associated factors during pregnancy in the BRISA cohort. Cad Saude Publica. 2016;32(1):S0102-311X2016000100707. PMID: 26886368; https://doi.org/10.1590/0102-311x00192714.
https://doi.org/10.1590/0102-311x0019271...
,1515. Segre CAM, coord. Efeitos do álcool na gestante, no feto e no recém-nascido. São Paulo: Sociedade de Pediatria de São Paulo; 2010. Available from: https://www.spsp.org.br/downloads/AlcoolSAF2.pdf. Accessed in 2023 (Jun. 21).
https://www.spsp.org.br/downloads/Alcool...
,4141. Guimarães VA, Fernandes KS, Lucchese R, et al. Prevalence and factors associated with alcohol use during pregnancy in a maternity hospital in Goiás, Central Brazil. Cien Saude Colet. 2018;23(10):3413-20. PMID: 30365860; https://doi.org/10.1590/1413-812320182310.24582016.
https://doi.org/10.1590/1413-81232018231...
we found that smoking was an important factor associated with risky alcohol consumption. The simultaneous use of alcohol and tobacco can be explained by the legality and wide availability of these substances as well as by the common maternal risk factors for their use during pregnancy, which are usually related to the vulnerability presented by these women.4242. Falk DE, Yi HY, Hiller-Sturmhöfel S. An epidemiologic analysis of co-occurring alcohol and tobacco use and disorders: findings from the National Epidemiologic Survey on Alcohol and Related Conditions. Alcohol Res Health. 2006;29(3):162-71. PMID: 17373404. In addition, studies have identified neurotransmitters and nicotine receptors that interact with both substances and mediate effects involved not only in their sensitivity but also in dependence.4343. Kurita H, Motoki N, Inaba Y, et al. Maternal alcohol consumption and risk of offspring with congenital malformation: the Japan Environment and Children’s Study. Pediatr Res. 2021;90(2):479-86. PMID: 33230193; https://doi.org/10.1038/s41390-020-01274-9.
https://doi.org/10.1038/s41390-020-01274...

The most discussed and described fetal malformations associated with alcohol consumption belong to the spectrum of findings observed in individuals with FAS.1414. Suttie M, Foroud T, Wetherill L, et al. Facial dysmorphism across the fetal alcohol spectrum. Pediatrics. 2013;131(3):e779-88. PMID: 23439907; https://doi.org/10.1542/peds.2012-1371.
https://doi.org/10.1542/peds.2012-1371...
However, some studies point to possible associations between maternal alcohol consumption and the occurrence of other anomalies.4343. Kurita H, Motoki N, Inaba Y, et al. Maternal alcohol consumption and risk of offspring with congenital malformation: the Japan Environment and Children’s Study. Pediatr Res. 2021;90(2):479-86. PMID: 33230193; https://doi.org/10.1038/s41390-020-01274-9.
https://doi.org/10.1038/s41390-020-01274...
In the present study, no major fetal/neonatal malformation was associated with the consumption of this substance. Alcohol can cross the placental barrier and directly interfere with embryonic and fetal development. However, there is no single mechanism that can explain all of the harmful effects of alcohol on the fetus or the precise alcohol amount that can cause malformations.99. Mesquita MA, Segre CA. Freqüência dos efeitos do álcool no feto e padrão de consumo de bebidas alcoólicas pelas gestantes de maternidade pública da cidade de São Paulo. J Human Growth Developm. 2009;19(1):63-77. https://doi.org/10.7322/jhgd.19903.
https://doi.org/10.7322/jhgd.19903...

Other factors have been associated with alcohol consumption during pregnancy, such as low education and socioeconomic level, advanced maternal age, and lack of prenatal care.88. Montag AC. Fetal alcohol-spectrum disorders: identifying at-risk mothers. Int J Womens Health. 2016;8:311-23. PMID: 27499649; https://doi.org/10.2147/ijwh.s85403.
https://doi.org/10.2147/ijwh.s85403...
,99. Mesquita MA, Segre CA. Freqüência dos efeitos do álcool no feto e padrão de consumo de bebidas alcoólicas pelas gestantes de maternidade pública da cidade de São Paulo. J Human Growth Developm. 2009;19(1):63-77. https://doi.org/10.7322/jhgd.19903.
https://doi.org/10.7322/jhgd.19903...
,1313. Tan CH, Denny CH, Cheal NE, Sniezek JE, Kanny D. Alcohol use and binge drinking among women of childbearing age - United States, 2011-2013. MMWR Morb Mortal Wkly Rep. 2015;64(37):1042-6. PMID: 26401713; https://doi.org/10.15585/mmwr.mm6437a3.
https://doi.org/10.15585/mmwr.mm6437a3...
However, we did not find significant relationships among them in the present study.

Despite the care we took in terms of both sample size and data collection and analysis, we cannot rule out possible limitations such as memory bias. Previous literature indicates that parents who have children with malformations tend to remember more details about their previous history, such as the use of substances during pregnancy.4444. Coughlin SS. Recall bias in epidemiologic studies. J Clin Epidemiol. 1990;43(1):87-91. PMID: 2319285. https://doi.org/10.1016/0895-4356(90)90060-3.
https://doi.org/10.1016/0895-4356(90)900...

CONCLUSION

Therefore, alcohol intake during pregnancy is common at our hospital. There is also high use during the first trimester as well as preferential consumption of fermented products and in abusive amounts, which represents important cause for concern. This risk of alcohol intake applies mainly to women who smoke, attempt pregnancy termination, or have a threat of miscarriage. However, there are protective factors such as the presence of a partner and pregnancy planning. Considering the unique characteristics of this vulnerable population, these findings may be important in the development of more effective campaigns for the avoidance of alcohol consumption by women during gestation.

Moreover, healthcare professionals should be prepared to identify efficient strategies during prenatal care, given the apparent lack of awareness in a considerable number of situations involving this issue in routine consultations.

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  • Sources of funding: None.

Edited by

Postgraduate Program in Pathology, Universidade Federal de Ciências da Saúde de Porto Alegre (UFCSPA), Porto Alegre (RS), Brazil

Edited by

Editor responsible for the evaluation process: Paulo Manuel Pêgo-Fernandes, MD, PhD

Publication Dates

  • Publication in this collection
    22 Apr 2024
  • Date of issue
    2024

History

  • Received
    27 May 2023
  • Reviewed
    09 Jan 2024
  • Accepted
    08 Feb 2024
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