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Print version ISSN 0021-7557
J. Pediatr. (Rio J.) vol.86 no.6 Porto Alegre Nov./Dec. 2010
Persistent operational challenges lead to non-reduction in maternal-infant transmission of HIV
Regina Célia de Souza Campos FernandesI; Gustavo Fernandes RibasII; Danielli Pires e SilvaIII; Alexandre Machado GomesIV; Enrique Medina-AcostaV
IDoutora, Doenças Infecciosas. Médica
pediatra, Faculdade de Medicina de Campos (FMC), Campos dos Goytacazes, RJ,
Brazil. Programa Municipal de DST/AIDS de Campos dos Goytacazes, Campos dos
Goytacazes, RJ, Brazil
IIAcadêmico, FMC, Campos dos Goytacazes, RJ, Brazil
IIIMédica residente, Hospital do Coração, São Paulo, SP, Brazil
IVMédico residente, Serviço de Clínica Médica, Hospital Escola Álvaro Alvim, Campos dos Goytacazes, RJ, Brazil
VDoutor, Parasitologia Médica e Molecular. Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ, Brazil
OBJECTIVE: To determine impediments to the effective reduction of maternal-infant transmission of HIV in the municipality of Campos dos Goytacazes, RJ, Brazil.
METHODS: This is a cohort study, with medical follow-up, of pregnant women with confirmed diagnosis of HIV infection, and their infant children, assisted at the Municipal Specialized Service of Sexually Transmitted Diseases/AIDS from January 2004 to April 2007. Information regarding exposure and outcome variables was collected from their medical records. Frequencies of variables were determined and bivariate analysis performed for exposure factors and transmission of HIV. Relative risks of HIV transmission associated with exposure variables were calculated using 95% confidence intervals. Statistical significance of risk associations was evaluated.
RESULTS: Seventy-eight mother-child pairs were studied; the rate of maternal-infant transmission of HIV was 7.7%. Variables showing significant association with maternal-infant transmission of HIV were the non-utilization of antiretrovirals for prophylaxis or treatment during pregnancy (RR = 21.00; 95%CI 2.64-166.74, p = 0.001) and diagnosis of maternal disease after pregnancy (RR = 6.80; 95%CI 1.59-29.17, p = 0.025). New pregnancies in women with other children also exposed to HIV occurred in 19.12% (15/78) of cases.
CONCLUSIONS: There was no reduction in the rate of maternal-infant transmission of HIV in the period 2004-2007 in relation to the preceding triennium. The following were recognized as impediments to the effective reduction of maternal-infant transmission of HIV: low prenatal screening coverage of maternal HIV infection, impairing maternal treatment or prophylaxis; and the incorrect use of the rapid screening test at admission for delivery.
Keywords: Antiretrovirals, HIV, newborn, maternal-infant transmission.
In Brazil, the rate of HIV infection among pregnant women is 0.6%,1 and preventing maternal-infant transmission (MIT) of HIV is a directive from Coordenação Nacional de DST e AIDS (National STD and AIDS Program).2
In the absence of any sort of intervention, rates of MIT of HIV are around 30%, though they may be cut down by 66% with the use of Zidovudine from the 14th week of pregnancy onwards, intravenously during delivery, and administered orally to the newborn during the first six weeks of life (Protocol ACTG 076).3 Its use for shorter periods also decreases rates of MIT of HIV.4
In developed countries, where every strategy is employed to prevent MIT of HIV, transmission rates range from 1 to 2%. In the developing world, high perinatal transmission persists due to the difficulty in diagnosing all infected pregnant women and submitting them to treatment or prophylaxis with antiretrovirals; and due to postpartum transmission via breastfeeding, which remains a major challenge.5
In Brazil, Protocol ACTG 076 has been in use since 1996. Universidade Federal do Rio de Janeiro had an especially successful experience with the protocol, and its Programa de Assistência Integral à Gestante HIV (Full Health Care for Pregnant Women with HIV Program) reported a rate of MIT of HIV of 1.6%.6 With triple therapy for pregnant women, the study by Escola Paulista de Medicina recorded absence of HIV infection in 111 children exposed to the virus.7 More recently, a multicenter study by Sociedade Brasileira de Pediatria reported a decrease in MIT of HIV from 16% in 1995 to 2.4% in 2002 in the state of São Paulo.8
Starting in 1999, the STD/AIDS Program of the city of Campos dos Goytacazes, RJ, Brazil, implemented the Municipal Program for Prevention of MIT of HIV, following Brazilian Ministry of Health guidelines for pregnant women and children exposed to the virus.9
From January 2001 to December 2003, the HIV infection rate among pregnant women in the municipality was 0.5 percent, close to the national average of 0.6%.10,11 From October 1999 to June 2004, 44 mother-child pairs submitted to Protocol ACTG 076 were tracked.12 Coverage of anti-HIV testing ranged from 28% in 2001 to 46% in 2003, with MIT of HIV rates of 6.8% during the period.12
The present study sought to describe the changes that took place from 2004 to 2007, in an attempt to review the strategies used to warrant a more effective prevention of MIT of HIV in the future.
This was an observational, prospective, longitudinal, analytic, concurrent cohort study that sought to determine the impediments to the effective reduction of MIT of HIV in the municipality of Campos dos Goytacazes.
The research included all pregnant women with confirmed diagnosis of HIV infection, as well as their infant children, as long as they completed HIV infection exams, assisted at the Municipal Specialized Service of Sexually Transmitted Diseases/AIDS in Campos dos Goytacazes, from January 2004 to April 2007.
Data were collected through a review of mothers' and infants' medical records. Information regarding the relevant variables was recorded in a questionnaire developed especially for this survey. Occurrence of MIT of HIV was considered the dependent variable. The following were considered exposure variables: delivery route, rupture of membranes, birth weight, breastfeeding, maternal age, previous knowledge of risk of HIV infection, maternal education, time of diagnosis of HIV infection relative to pregnancy, viral load, CD4 counts, and maternal prophylaxis or treatment. The data from the questionnaire were managed using the application EpiData version 3.113 and analyzed using application EpiData Analysis V188.8.131.52.
Frequencies of variables were determined and bivariate analysis performed for exposure and dependent variables. As measure of outcome, relative risks of MIT of HIV associated with exposure variables were calculated using 95% confidence intervals (95%CI), excluding cases in which information about variables were not available and those for which there were no maternal viral load and CD4 exams. Due to the small sample size, Fisher's exact test was used to assess statistical significance of potential risk associations. The estimate of total pregnant women in the municipality comes from the "number of live births" indicator for the city for 2004-2006.14
The present study was approved by the Research Ethics Committee of Faculdade de Medicina de Campos.
During the study period, on average 3,692 pregnant women received medical assistance annually, which corresponds to half the total number of pregnant women in the municipality, with little progress in recruitment throughout the study period (Table 1).
The cohort had greater use of cesarean sections, and predominant rupture of membranes at delivery and birth weight equal to or above 2,500 g, all variables associated with lower rates of MIT of HIV (Table 2).
Low maternal age (< 30 years old) was predominant, as was low education (< or equal to complete secondary education). Most pregnant women were aware of the risk of MIT of HIV and its prevention. Diagnosis of maternal disease before pregnancy was 38.5% and confirmed during the prenatal period in 48.7% of cases. When diagnosis of maternal infection was performed during the postpartum period, MIT of HIV was statistically significant. Not breastfeeding consists in a protective factor for MIT of HIV (Table 3).
Maternal viral load and CD4 counts, when assessed, had no statistically significant association with MIT of HIV. Non-use of prophylaxis or treatment during pregnancy had a statistically significant association with MIT of HIV (Table 4).
At endpoint, the investigation on MIT of HIV found that six children exposed to the virus were infected, the transmission rate being 7.7%. We analyzed their medical records to explain why each of the six infants was infected. Three mothers were diagnosed by rapid anti-HIV screening test: one before delivery, and the other two postpartum. In the first case, the child was born preterm, weighing 1,930 g, and cesarean section was performed after rupture of membranes. In the other two cases, mothers did not receive Zidovudine intravenously during delivery; one delivered vaginally, the other by cesarean section after rupture of membranes, and both infants were breastfed. In the fourth case, maternal HIV infection was diagnosed during pregnancy; the patient received triple therapy with Zidovudine, Lamivudine and Nelfinavir, delivered by cesarean section, and did not breastfeed. In this case, poor adherence to treatment on the part of the mother was implicated as cause. In the fifth, the patient had confirmed diagnosis before pregnancy and had been part of multiple treatment plans, always with poor compliance. Elective cesarean section was performed on the 38th week; the mother, with high viral load and severe immunodepression, suffered reactivation of toxoplasmosis and died.15 The newborn, as well as infected with HIV, was also diagnosed with congenital toxoplasmosis. The case is a good example of what should be our greatest challenge in coming years: providing care to pregnant women in advanced stages of the disease, as well as treatment and follow-up for their infected children.16 The sixth infected child was delivered vaginally, and her mother was also diagnosed in the postpartum period using rapid screening test. At 9 months old, her first viral load was undetectable, and follow-up was interrupted. At 3 years old, when diagnosis of HIV infection for her sister was confirmed, the girl was tested once again and serology results came back positive; the attending clinician learned her mother had resumed breastfeeding.
In 2007, an eight year project focused on preventing MIT of HIV in the municipality of Campos dos Goytacazes was completed. The project overcame several well known obstacles: 1) awareness of need to request anti-HIV serology during pregnancy; 2) extending testing initially concentrated in a single health care unit; 3) integration with Programa de Saúde da Mulher e de Saúde da Família (Woman and Family Health Program), as discussed in the literature12,17; 4) municipal responsibility for CD4 and viral load dosages, at the moment available for all pregnant women seeking assistance; and 5) use of rapid anti-HIV screening tests in previously unexamined pregnant women.
Despite the effort, there was no decrease in the rate of MIT of HIV in the 2004-2007 triennium (7.7%) in relation to the 2001-2003 triennium (6.8%).12
From January 2004 to April 2007, 81 mother-child pairs were studied, three of whom were excluded from the final analysis, two because the infants died in the first months of life and one because of loss of patient follow-up. Cesarean sections were predominant, confirming their protective power over MIT of HIV18; the same was found for rupture of membranes during delivery.
In cases with birth weight below 2,500 g, relative risk of MIT of HIV was high. This points to possibility of more advanced maternal disease, as well as treatment with protease inhibitors, which are associated with preterm birth and, consequently, low birth weight.19-21
The pregnant women in this study were predominantly young, 30 years old or less, and had low education levels, matching current epidemiological trends in Brazil, i.e., the feminization and pauperization of the disease.2,12,22 Some were younger than 20, which imposes an additional challenge to the research. At that age range, there are more Brazilian women infected with HIV than men, a particularly grave problem in the context of increased teenage pregnancy and low adherence to prenatal care and treatment in this age group.12
Not all pregnant women were aware of the potential for MIT of HIV, a fact that highlights the need to stress that possibility at every opportunity (waiting room in outpatient facilities, hospital environments, doctors' offices, etc.).
Regarding time of maternal diagnosis, the present study can show very little increase in recruitment of pregnant women before delivery and greater usage of rapid screening tests at delivery in relation to the period before 2004.12 The situation calls for greater awareness of the importance of its use soon after pregnant women are admitted to the hospital, thus enabling the immediate application of prophylaxis measures. The nonperformance of immediate rapid screening tests led to high rates of MIT of HIV, and the association was statistically significant.
The World Health Organization strongly contraindicates breastfeeding in cases of maternal HIV infection and in locations where milk-based formula is available.23 In the present cohort, diagnosis of infection using the rapid screening test postpartum enabled infants to be breastfed, impacting MIT of HIV.
The importance of diagnosing HIV infection before pregnancy was confirmed, since it enables the use of Zidovudine or triple antiretroviral therapy. Without the use of any prophylaxis or therapy during pregnancy, rates of MIT of HIV reach 33.3%, compared to 0% for the group receiving Zidovudine and 3.1% for the group receiving triple therapy. The higher transmission value of the last group is probably correlated with its late start, incomplete adherence to the treatment regimen, more severe and prolonged maternal disease, and the pharmacokinetics of antiretrovirals during the last trimester of pregnancy.24
The rate of MIT of HIV of 7.7% determined in this study is very high when compared to that of other studies: in Spain (1.42%),25 a rural province in China (1%),26 the European Collaborative Study (1.72%),24 and South Africa (4.9%).27 It is also high when compared to other Brazilian studies,6-8 and its determining factors were clearly defined by the analysis of individual cases of infected children: late diagnosis of maternal infection, incorrect use of rapid screening test, failure to contraindicate breastfeeding, low adherence to antiretroviral therapy by pregnant women, and persistence of breastfeeding after diagnosis of maternal disease.
Another important aspect is the occurrence of new pregnancies in the context of previously known maternal HIV infection. Our cohort included 15 such cases. The fact underscores the importance of recommending the use of preservatives and/or other birth control resources, as well as follow-up by multidisciplinary teams.
In conclusion, the challenge of preventing MIT of HIV remains, despite all the hard work of health care professionals. The following factors determined the non-reduction of MIT of HIV: low coverage of prenatal anti-HIV testing and incorrect use of rapid screening tests upon admission of untested pregnant women for delivery. These obstacles will only be overcome by the concerted efforts of health care professionals, managers, and the government. Each new child infected with HIV by MIT should be faced as a sentinel failure event in care provided to pregnant women, and requiring judicious analysis of the situation.
To the pregnant women and their children who took part in this study. To the members of the Campos dos Goytacazes Municipal STD/AIDS Program and Specialized Service of Sexually Transmitted Diseases/AIDS.
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Correspondence: Manuscript submitted Jul 12 2010, accepted for publication Sep 09 2010.
Financial support: Secretaria Municipal de Saúde de Campos, Programa Nacional de DST/AIDS de Campos dos Goytacazes, Brazilian Ministry of Health. UNESCO.
Regina C. S. C. Fernandes
Rua Conselheiro Otaviano, 241
CEP 28010-140 Campos dos Goytacazes, RJ Brazil
Tel.: +55 (22) 2726.6758
Fax: +55 (22) 2726.6758
No conflicts of interest declared concerning the publication of this article.
Suggested citation: Fernandes RC, Ribas GF, Silva DP, Gomes AM, Medina-Acosta E. Persistent operational challenges lead to non-reduction in maternal-infant transmission of HIV. J Pediatr (Rio J). 2010;86(6):503-508.
Manuscript submitted Jul 12 2010, accepted for publication Sep 09 2010.
Financial support: Secretaria Municipal de Saúde de Campos, Programa Nacional de DST/AIDS de Campos dos Goytacazes, Brazilian Ministry of Health. UNESCO.